kernel26-magellan/patches-2.6.21-r7/0154-2.6.21-suspend2-2.2.9.17.patch

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 12533a9..68e902e 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -82,6 +82,7 @@ parameter is applicable:
 	SH	SuperH architecture is enabled.
 	SMP	The kernel is an SMP kernel.
 	SPARC	Sparc architecture is enabled.
+	SUSPEND2 Suspend2 is enabled.
 	SWSUSP	Software suspend is enabled.
 	TS	Appropriate touchscreen support is enabled.
 	USB	USB support is enabled.
@@ -1140,6 +1141,8 @@ and is between 256 and 4096 characters. It is defined in the file
 	noresume	[SWSUSP] Disables resume and restores original swap
 			space.
 
+	noresume2	[SUSPEND2] Disables resuming and restores original swap signature.
+ 
 	no-scroll	[VGA] Disables scrollback.
 			This is required for the Braillex ib80-piezo Braille
 			reader made by F.H. Papenmeier (Germany).
@@ -1445,6 +1448,11 @@ and is between 256 and 4096 characters. It is defined in the file
 
 	retain_initrd	[RAM] Keep initrd memory after extraction
 
+ 	resume2=	[SUSPEND2] Specify the storage device for Suspend2.
+			Format: <writer>:<writer-parameters>.
+			See Documentation/power/suspend2.txt for details of the
+			formats	for available image writers.
+
 	rhash_entries=	[KNL,NET]
 			Set number of hash buckets for route cache
 
diff --git a/Documentation/power/suspend2-internals.txt b/Documentation/power/suspend2-internals.txt
new file mode 100644
index 0000000..ba4e1e5
--- /dev/null
+++ b/Documentation/power/suspend2-internals.txt
@@ -0,0 +1,473 @@
+		Software Suspend 2.2 Internal Documentation.
+				Version 1
+
+1.  Introduction.
+
+    Software Suspend 2.2 is an addition to the Linux Kernel, designed to
+    allow the user to quickly shutdown and quickly boot a computer, without
+    needing to close documents or programs. It is equivalent to the
+    hibernate facility in some laptops. This implementation, however,
+    requires no special BIOS or hardware support.
+
+    The code in these files is based upon the original implementation
+    prepared by Gabor Kuti and additional work by Pavel Machek and a
+    host of others. This code has been substantially reworked by Nigel
+    Cunningham, again with the help and testing of many others, not the
+    least of whom is Michael Frank. At its heart, however, the operation is
+    essentially the same as Gabor's version.
+
+2.  Overview of operation.
+
+    The basic sequence of operations is as follows:
+
+	a. Quiesce all other activity.
+	b. Ensure enough memory and storage space are available, and attempt
+	   to free memory/storage if necessary.
+	c. Allocate the required memory and storage space.
+	d. Write the image.
+	e. Power down.
+
+    There are a number of complicating factors which mean that things are
+    not as simple as the above would imply, however...
+
+    o The activity of each process must be stopped at a point where it will
+    not be holding locks necessary for saving the image, or unexpectedly
+    restart operations due to something like a timeout and thereby make
+    our image inconsistent.
+
+    o It is desirous that we sync outstanding I/O to disk before calculating
+    image statistics. This reduces corruption if one should suspend but
+    then not resume, and also makes later parts of the operation safer (see
+    below).
+
+    o We need to get as close as we can to an atomic copy of the data.
+    Inconsistencies in the image will result in inconsistent memory contents at
+    resume time, and thus in instability of the system and/or file system
+    corruption. This would appear to imply a maximum image size of one half of
+    the amount of RAM, but we have a solution... (again, below).
+
+    o In 2.6, we choose to play nicely with the other suspend-to-disk
+    implementations.
+
+3.  Detailed description of internals.
+
+    a. Quiescing activity.
+
+    Safely quiescing the system is achieved using two methods.
+
+    First, we note that the vast majority of processes don't need to run during
+    suspend. They can be 'frozen'. We therefore implement a refrigerator
+    routine, which processes enter and in which they remain until the cycle is
+    complete. Processes enter the refrigerator via try_to_freeze() invocations
+    at appropriate places.  A process cannot be frozen in any old place. It
+    must not be holding locks that will be needed for writing the image or
+    freezing other processes. For this reason, userspace processes generally
+    enter the refrigerator via the signal handling code, and kernel threads at
+    the place in their event loops where they drop locks and yield to other
+    processes or sleep.
+
+    The second part of our method for quisescing the system involves freezing
+    the filesystems. We use the standard freeze_bdev and thaw_bdev functions to
+    ensure that all of the user's data is synced to disk before we begin to
+    write the image. This is particularly important with XFS, where without
+    bdev freezing, activity may still occur after we begin to write the image
+    (potentially causing in-memory and on-disk corruption later).
+
+    Quiescing the system works most quickly and reliably when we add one more
+    element to the algorithm: separating the freezing of userspace processes
+    from the freezing of kernel space processes, and doing the filesystem freeze
+    in between. The filesystem freeze needs to be done while kernel threads such
+    as kjournald can still run.  At the same time, though, everything will be
+    less racy and run more quickly if we stop userspace submitting more I/O work
+    while we're trying to quiesce.
+
+    Quiescing the system is therefore done in three steps:
+	- Freeze userspace
+	- Freeze filesystems
+	- Freeze kernel threads
+
+    If we need to free memory, we thaw kernel threads and filesystems, but not
+    userspace. We can then free caches without worrying about deadlocks due to
+    swap files being on frozen filesystems or such like.
+
+    One limitation of this is that FUSE filesystems are incompatible with
+    suspending to disk. They need to be unmounted prior to suspending, to avoid
+    potential deadlocks.
+
+    b. Ensure enough memory & storage are available.
+
+    We have a number of constraints to meet in order to be able to successfully
+    suspend and resume.
+
+    First, the image will be written in two parts, described below. One of these
+    parts needs to have an atomic copy made, which of course implies a maximum
+    size of one half of the amount of system memory. The other part ('pageset')
+    is not atomically copied, and can therefore be as large or small as desired.
+
+    Second, we have constraints on the amount of storage available. In these
+    calculations, we may also consider any compression that will be done. The
+    cryptoapi module allows the user to configure an expected compression ratio.
+   
+    Third, the user can specify an arbitrary limit on the image size, in
+    megabytes. This limit is treated as a soft limit, so that we don't fail the
+    attempt to suspend if we cannot meet this constraint.
+
+    c. Allocate the required memory and storage space.
+
+    Having done the initial freeze, we determine whether the above constraints
+    are met, and seek to allocate the metadata for the image. If the constraints
+    are not met, or we fail to allocate the required space for the metadata, we
+    seek to free the amount of memory that we calculate is needed and try again.
+    We allow up to four iterations of this loop before aborting the cycle. If we
+    do fail, it should only be because of a bug in Suspend's calculations.
+    
+    These steps are merged together in the prepare_image function, found in
+    prepare_image.c. The functions are merged because of the cyclical nature
+    of the problem of calculating how much memory and storage is needed. Since
+    the data structures containing the information about the image must
+    themselves take memory and use storage, the amount of memory and storage
+    required changes as we prepare the image. Since the changes are not large,
+    only one or two iterations will be required to achieve a solution.
+
+    The recursive nature of the algorithm is miminised by keeping user space
+    frozen while preparing the image, and by the fact that our records of which
+    pages are to be saved and which pageset they are saved in use bitmaps (so
+    that changes in number or fragmentation of the pages to be saved don't
+    feedback via changes in the amount of memory needed for metadata). The
+    recursiveness is thus limited to any extra slab pages allocated to store the
+    extents that record storage used, and he effects of seeking to free memory.
+
+    d. Write the image.
+
+    We previously mentioned the need to create an atomic copy of the data, and
+    the half-of-memory limitation that is implied in this. This limitation is
+    circumvented by dividing the memory to be saved into two parts, called
+    pagesets.
+
+    Pageset2 contains the page cache - the pages on the active and inactive
+    lists. These pages aren't needed or modifed while Suspend2 is running, so
+    they can be safely written without an atomic copy. They are therefore
+    saved first and reloaded last. While saving these pages, Suspend2 carefully
+    ensures that the work of writing the pages doesn't make the image
+    inconsistent.
+
+    Once pageset2 has been saved, we prepare to do the atomic copy of remaining
+    memory. As part of the preparation, we power down drivers, thereby providing
+    them with the opportunity to have their state recorded in the image. The
+    amount of memory allocated by drivers for this is usually negligible, but if
+    DRI is in use, video drivers may require significants amounts. Ideally we
+    would be able to query drivers while preparing the image as to the amount of
+    memory they will need. Unfortunately no such mechanism exists at the time of
+    writing. For this reason, Suspend2 allows the user to set an
+    'extra_pages_allowance', which is used to seek to ensure sufficient memory
+    is available for drivers at this point. Suspend2 also lets the user set this
+    value to 0. In this case, a test driver suspend is done while preparing the
+    image, and the difference (plus a margin) used instead.
+
+    Having suspended the drivers, we save the CPU context before making an
+    atomic copy of pageset1, resuming the drivers and saving the atomic copy.
+    After saving the two pagesets, we just need to save our metadata before
+    powering down.
+
+    As we mentioned earlier, the contents of pageset2 pages aren't needed once
+    they've been saved. We therefore use them as the destination of our atomic
+    copy. In the unlikely event that pageset1 is larger, extra pages are
+    allocated while the image is being prepared. This is normally only a real
+    possibility when the system has just been booted and the page cache is
+    small.
+
+    This is where we need to be careful about syncing, however. Pageset2 will
+    probably contain filesystem meta data. If this is overwritten with pageset1
+    and then a sync occurs, the filesystem will be corrupted - at least until
+    resume time and another sync of the restored data. Since there is a
+    possibility that the user might not resume or (may it never be!) that
+    suspend might oops, we do our utmost to avoid syncing filesystems after
+    copying pageset1.
+
+    e. Power down.
+
+    Powering down uses standard kernel routines. Suspend2 supports powering down
+    using the ACPI S3, S4 and S5 methods or the kernel's non-ACPI power-off.
+    Supporting suspend to ram (S3) as a power off option might sound strange,
+    but it allows the user to quickly get their system up and running again if
+    the battery doesn't run out (we just need to re-read the overwritten pages)
+    and if the battery does run out (or the user removes power), they can still
+    resume.
+
+4.  Data Structures.
+
+    Suspend2 uses three main structures to store its metadata and configuration
+    information:
+
+    a) Pageflags bitmaps.
+
+    Suspend records which pages will be in pageset1, pageset2, the destination
+    of the atomic copy and the source of the atomically restored image using
+    bitmaps. These bitmaps are created from order zero allocations to maximise
+    reliability. The individual pages are combined together with pointers to
+    form per-zone bitmaps, which are in turn combined with another layer of
+    pointers to construct the overall bitmap.
+
+    The pageset1 bitmap is thus easily stored in the image header for use at
+    resume time.
+
+    As mentioned above, using bitmaps also means that the amount of memory and
+    storage required for recording the above information is constant. This
+    greatly simplifies the work of preparing the image. In earlier versions of
+    Suspend2, extents were used to record which pages would be stored. In that
+    case, however, eating memory could result in greater fragmentation of the
+    lists of pages, which in turn required more memory to store the extents and
+    more storage in the image header. These could in turn require further
+    freeing of memory, and another iteration. All of this complexity is removed
+    by having bitmaps.
+
+    Bitmaps also make a lot of sense because Suspend2 only ever iterates
+    through the lists. There is therefore no cost to not being able to find the
+    nth page in order 0 time. We only need to worry about the cost of finding
+    the n+1th page, given the location of the nth page. Bitwise optimisations
+    help here.
+
+    The data structure is: unsigned long ***.
+
+    b) Extents for block data.
+
+    Suspend2 supports writing the image to multiple block devices. In the case
+    of swap, multiple partitions and/or files may be in use, and we happily use
+    them all. This is accomplished as follows:
+
+    Whatever the actual source of the allocated storage, the destination of the
+    image can be viewed in terms of one or more block devices, and on each
+    device, a list of sectors. To simplify matters, we only use contiguous,
+    PAGE_SIZE aligned sectors, like the swap code does.
+
+    Since sector numbers on each bdev may well not start at 0, it makes much
+    more sense to use extents here. Contiguous ranges of pages can thus be
+    represented in the extents by contiguous values.
+
+    Variations in block size are taken account of in transforming this data
+    into the parameters for bio submission.
+
+    We can thus implement a layer of abstraction wherein the core of Suspend2
+    doesn't have to worry about which device we're currently writing to or
+    where in the device we are. It simply requests that the next page in the
+    pageset or header be written, leaving the details to this lower layer.
+    The lower layer remembers where in the sequence of devices and blocks each
+    pageset starts. The header always starts at the beginning of the allocated
+    storage.
+
+    So extents are:
+
+    struct extent {
+      unsigned long minimum, maximum;
+      struct extent *next;
+    }
+
+    These are combined into chains of extents for a device:
+
+    struct extent_chain {
+      int size; /* size of the extent ie sum (max-min+1) */
+      int allocs, frees;
+      char *name;
+      struct extent *first, *last_touched;
+    };
+
+    For each bdev, we need to store a little more info:
+
+    struct suspend_bdev_info {
+       struct block_device *bdev;
+       dev_t dev_t;
+       int bmap_shift;
+       int blocks_per_page;
+    };
+
+    The dev_t is used to identify the device in the stored image. As a result,
+    we expect devices at resume time to have the same major and minor numbers
+    as they had while suspending.  This is primarily a concern where the user
+    utilises LVM for storage, as they will need to dmsetup their partitions in
+    such a way as to maintain this consistency at resume time.
+
+    bmap_shift and blocks_per_page record apply the effects of variations in
+    blocks per page settings for the filesystem and underlying bdev. For most
+    filesystems, these are the same, but for xfs, they can have independant
+    values.
+
+    Combining these two structures together, we have everything we need to
+    record what devices and what blocks on each device are being used to
+    store the image, and to submit i/o using bio_submit.
+
+    The last elements in the picture are a means of recording how the storage
+    is being used.
+
+    We do this first and foremost by implementing a layer of abstraction on
+    top of the devices and extent chains which allows us to view however many
+    devices there might be as one long storage tape, with a single 'head' that
+    tracks a 'current position' on the tape:
+
+    struct extent_iterate_state {
+      struct extent_chain *chains;
+      int num_chains;
+      int current_chain;
+      struct extent *current_extent;
+      unsigned long current_offset;
+    };
+
+    That is, *chains points to an array of size num_chains of extent chains.
+    For the filewriter, this is always a single chain. For the swapwriter, the
+    array is of size MAX_SWAPFILES.
+
+    current_chain, current_extent and current_offset thus point to the current
+    index in the chains array (and into a matching array of struct
+    suspend_bdev_info), the current extent in that chain (to optimise access),
+    and the current value in the offset.
+
+    The image is divided into three parts:
+    - The header
+    - Pageset 1
+    - Pageset 2
+
+    The header always starts at the first device and first block. We know its
+    size before we begin to save the image because we carefully account for
+    everything that will be stored in it.
+
+    The second pageset (LRU) is stored first. It begins on the next page after
+    the end of the header.
+
+    The first pageset is stored second. It's start location is only known once
+    pageset2 has been saved, since pageset2 may be compressed as it is written.
+    This location is thus recorded at the end of saving pageset2. It is page
+    aligned also.
+
+    Since this information is needed at resume time, and the location of extents
+    in memory will differ at resume time, this needs to be stored in a portable
+    way:
+
+    struct extent_iterate_saved_state {
+        int chain_num;
+        int extent_num;
+        unsigned long offset;
+    };
+
+    We can thus implement a layer of abstraction wherein the core of Suspend2
+    doesn't have to worry about which device we're currently writing to or
+    where in the device we are. It simply requests that the next page in the
+    pageset or header be written, leaving the details to this layer, and
+    invokes the routines to remember and restore the position, without having
+    to worry about the details of how the data is arranged on disk or such like.
+
+    c) Modules
+
+    One aim in designing Suspend2 was to make it flexible. We wanted to allow
+    for the implementation of different methods of transforming a page to be
+    written to disk and different methods of getting the pages stored.
+
+    In early versions (the betas and perhaps Suspend1), compression support was
+    inlined in the image writing code, and the data structures and code for
+    managing swap were intertwined with the rest of the code. A number of people
+    had expressed interest in implementing image encryption, and alternative
+    methods of storing the image.
+
+    In order to achieve this, Suspend2 was given a modular design.
+
+    A module is a single file which encapsulates the functionality needed
+    to transform a pageset of data (encryption or compression, for example),
+    or to write the pageset to a device. The former type of module is called
+    a 'page-transformer', the later a 'writer'.
+
+    Modules are linked together in pipeline fashion. There may be zero or more
+    page transformers in a pipeline, and there is always exactly one writer.
+    The pipeline follows this pattern:
+
+		---------------------------------
+		|          Suspend2 Core        |
+		---------------------------------
+				|
+				|
+		---------------------------------
+		|	Page transformer 1	|
+		---------------------------------
+				|
+				|
+		---------------------------------
+		|	Page transformer 2	|
+		---------------------------------
+				|
+				|
+		---------------------------------
+		|            Writer		|
+		---------------------------------
+
+    During the writing of an image, the core code feeds pages one at a time
+    to the first module. This module performs whatever transformations it
+    implements on the incoming data, completely consuming the incoming data and
+    feeding output in a similar manner to the next module. A module may buffer
+    its output.
+
+    During reading, the pipeline works in the reverse direction. The core code
+    calls the first module with the address of a buffer which should be filled.
+    (Note that the buffer size is always PAGE_SIZE at this time). This module
+    will in turn request data from the next module and so on down until the
+    writer is made to read from the stored image.
+
+    Part of definition of the structure of a module thus looks like this:
+
+        int (*rw_init) (int rw, int stream_number);
+        int (*rw_cleanup) (int rw);
+        int (*write_chunk) (struct page *buffer_page);
+        int (*read_chunk) (struct page *buffer_page, int sync);
+
+    It should be noted that the _cleanup routine may be called before the
+    full stream of data has been read or written. While writing the image,
+    the user may (depending upon settings) choose to abort suspending, and
+    if we are in the midst of writing the last portion of the image, a portion
+    of the second pageset may be reread. This may also happen if an error
+    occurs and we seek to abort the process of writing the image.
+
+    The modular design is also useful in a number of other ways. It provides
+    a means where by we can add support for:
+
+    - providing overall initialisation and cleanup routines;
+    - serialising configuration information in the image header;
+    - providing debugging information to the user;
+    - determining memory and image storage requirements;
+    - dis/enabling components at run-time;
+    - configuring the module (see below);
+
+    ...and routines for writers specific to their work:
+    - Parsing a resume2= location;
+    - Determining whether an image exists;
+    - Marking a resume as having been attempted;
+    - Invalidating an image;
+
+    Since some parts of the core - the user interface and storage manager
+    support - have use for some of these functions, they are registered as
+    'miscellaneous' modules as well.
+
+    d) Sysfs data structures.
+
+    This brings us naturally to support for configuring Suspend2. We desired to
+    provide a way to make Suspend2 as flexible and configurable as possible.
+    The user shouldn't have to reboot just because they want to now suspend to
+    a file instead of a partition, for example.
+
+    To accomplish this, Suspend2 implements a very generic means whereby the
+    core and modules can register new sysfs entries. All Suspend2 entries use
+    a single _store and _show routine, both of which are found in sysfs.c in
+    the kernel/power directory. These routines handle the most common operations
+    - getting and setting the values of bits, integers, longs, unsigned longs
+    and strings in one place, and allow overrides for customised get and set
+    options as well as side-effect routines for all reads and writes.
+
+    When combined with some simple macros, a new sysfs entry can then be defined
+    in just a couple of lines:
+
+    { SUSPEND2_ATTR("progress_granularity", SYSFS_RW),
+      SYSFS_INT(&progress_granularity, 1, 2048)
+    },
+
+    This defines a sysfs entry named "progress_granularity" which is rw and
+    allows the user to access an integer stored at &progress_granularity, giving
+    it a value between 1 and 2048 inclusive.
+
+    Sysfs entries are registered under /sys/power/suspend2, and entries for
+    modules are located in a subdirectory named after the module.
+
diff --git a/Documentation/power/suspend2.txt b/Documentation/power/suspend2.txt
new file mode 100644
index 0000000..b5a8edb
--- /dev/null
+++ b/Documentation/power/suspend2.txt
@@ -0,0 +1,713 @@
+	--- Suspend2, version 2.2 ---
+
+1.  What is it?
+2.  Why would you want it?
+3.  What do you need to use it?
+4.  Why not just use the version already in the kernel?
+5.  How do you use it?
+6.  What do all those entries in /sys/power/suspend2 do?
+7.  How do you get support?
+8.  I think I've found a bug. What should I do?
+9.  When will XXX be supported?
+10  How does it work?
+11. Who wrote Suspend2?
+
+1. What is it?
+
+   Imagine you're sitting at your computer, working away. For some reason, you
+   need to turn off your computer for a while - perhaps it's time to go home
+   for the day. When you come back to your computer next, you're going to want
+   to carry on where you left off. Now imagine that you could push a button and
+   have your computer store the contents of its memory to disk and power down.
+   Then, when you next start up your computer, it loads that image back into
+   memory and you can carry on from where you were, just as if you'd never
+   turned the computer off. Far less time to start up, no reopening
+   applications and finding what directory you put that file in yesterday.
+   That's what Suspend2 does.
+
+   Suspend2 has a long heritage. It began life as work by Gabor Kuti, who,
+   with some help from Pavel Machek, got an early version going in 1999. The
+   project was then taken over by Florent Chabaud while still in alpha version
+   numbers. Nigel Cunningham came on the scene when Florent was unable to
+   continue, moving the project into betas, then 1.0, 2.0 and so on up to
+   the present 2.2 series. Pavel Machek's swsusp code, which was merged around
+   2.5.17 retains the original name, and was essentially a fork of the beta
+   code until Rafael Wysocki came on the scene in 2005 and began to improve it
+   further.
+
+2. Why would you want it?
+
+   Why wouldn't you want it?
+   
+   Being able to save the state of your system and quickly restore it improves
+   your productivity - you get a useful system in far less time than through
+   the normal boot process.
+   
+3. What do you need to use it?
+
+   a. Kernel Support.
+
+   i) The Suspend2 patch.
+   
+   Suspend2 is part of the Linux Kernel. This version is not part of Linus's
+   2.6 tree at the moment, so you will need to download the kernel source and
+   apply the latest patch. Having done that, enable the appropriate options in
+   make [menu|x]config (under Power Management Options), compile and install your
+   kernel. Suspend2 works with SMP, Highmem, preemption, x86-32, PPC and x86_64.
+
+   Suspend2 patches are available from http://suspend2.net.
+
+   ii) Compression and encryption support.
+
+   Compression and encryption support are implemented via the
+   cryptoapi. You will therefore want to select any Cryptoapi transforms that
+   you want to use on your image from the Cryptoapi menu while configuring
+   your kernel.
+
+   You can also tell Suspend to write it's image to an encrypted and/or
+   compressed filesystem/swap partition. In that case, you don't need to do
+   anything special for Suspend2 when it comes to kernel configuration.
+
+   iii) Configuring other options.
+
+   While you're configuring your kernel, try to configure as much as possible
+   to build as modules. We recommend this because there are a number of drivers
+   that are still in the process of implementing proper power management
+   support. In those cases, the best way to work around their current lack is
+   to build them as modules and remove the modules while suspending. You might
+   also bug the driver authors to get their support up to speed, or even help!
+
+   b. Storage.
+
+   i) Swap.
+
+   Suspend2 can store the suspend image in your swap partition, a swap file or
+   a combination thereof. Whichever combination you choose, you will probably
+   want to create enough swap space to store the largest image you could have,
+   plus the space you'd normally use for swap. A good rule of thumb would be
+   to calculate the amount of swap you'd want without using Suspend2, and then
+   add the amount of memory you have. This swapspace can be arranged in any way
+   you'd like. It can be in one partition or file, or spread over a number. The
+   only requirement is that they be active when you start a suspend cycle.
+   
+   There is one exception to this requirement. Suspend2 has the ability to turn
+   on one swap file or partition at the start of suspending and turn it back off
+   at the end. If you want to ensure you have enough memory to store a image
+   when your memory is fully used, you might want to make one swap partition or
+   file for 'normal' use, and another for Suspend2 to activate & deactivate
+   automatically. (Further details below).
+
+   ii) Normal files.
+
+   Suspend2 includes a 'filewriter'. The filewriter can store your image in a
+   simple file. Since Linux has the idea of everything being a file, this is
+   more powerful than it initially sounds. If, for example, you were to set up
+   a network block device file, you could suspend to a network server. This has
+   been tested and works to a point, but nbd itself isn't stateless enough for
+   our purposes.
+
+   Take extra care when setting up the filewriter. If you just type commands
+   without thinking and then try to suspend, you could cause irreversible
+   corruption on your filesystems! Make sure you have backups.
+
+   Most people will only want to suspend to a local file. To achieve that, do
+   something along the lines of:
+
+   echo "Suspend2" > /suspend-file
+   dd if=/dev/zero bs=1M count=512 >> suspend-file
+
+   This will create a 512MB file called /suspend-file. To get Suspend2 to use
+   it:
+
+   echo /suspend-file > /sys/power/suspend2/filewriter/filewriter_target
+
+   Then
+
+   cat /sys/power/suspend2/resume2
+
+   Put the results of this into your bootloader's configuration (see also step
+   C, below:
+
+   ---EXAMPLE-ONLY-DON'T-COPY-AND-PASTE---
+   # cat /sys/power/suspend2/resume2
+   file:/dev/hda2:0x1e001
+   
+   In this example, we would edit the append= line of our lilo.conf|menu.lst
+   so that it included:
+
+   resume2=file:/dev/hda2:0x1e001
+   ---EXAMPLE-ONLY-DON'T-COPY-AND-PASTE---
+ 
+   For those who are thinking 'Could I make the file sparse?', the answer is
+   'No!'. At the moment, there is no way for Suspend2 to fill in the holes in
+   a sparse file while suspending. In the longer term (post merge!), I'd like
+   to change things so that the file could be dynamically resized as needed.
+   Right now, however, that's not possible and not a priority.
+
+   c. Bootloader configuration.
+   
+   Using Suspend2 also requires that you add an extra parameter to 
+   your lilo.conf or equivalent. Here's an example for a swap partition:
+
+   append="resume2=swap:/dev/hda1"
+
+   This would tell Suspend2 that /dev/hda1 is a swap partition you 
+   have. Suspend2 will use the swap signature of this partition as a
+   pointer to your data when you suspend. This means that (in this example)
+   /dev/hda1 doesn't need to be _the_ swap partition where all of your data
+   is actually stored. It just needs to be a swap partition that has a
+   valid signature.
+
+   You don't need to have a swap partition for this purpose. Suspend2
+   can also use a swap file, but usage is a little more complex. Having made
+   your swap file, turn it on and do 
+
+   cat /sys/power/suspend2/swapwriter/headerlocations
+
+   (this assumes you've already compiled your kernel with Suspend2
+   support and booted it). The results of the cat command will tell you
+   what you need to put in lilo.conf:
+
+   For swap partitions like /dev/hda1, simply use resume2=/dev/hda1.
+   For swapfile `swapfile`, use resume2=swap:/dev/hda2:0x242d.
+
+   If the swapfile changes for any reason (it is moved to a different
+   location, it is deleted and recreated, or the filesystem is
+   defragmented) then you will have to check
+   /sys/power/suspend2/swapwriter/headerlocations for a new resume_block value.
+
+   Once you've compiled and installed the kernel and adjusted your bootloader
+   configuration, you should only need to reboot for the most basic part
+   of Suspend2 to be ready.
+
+   If you only compile in the swapwriter, or only compile in the filewriter,
+   you don't need to add the "swap:" part of the resume2= parameters above.
+   resume2=/dev/hda2:0x242d will work just as well.
+
+   d. The hibernate script.
+
+   Since the driver model in 2.6 kernels is still being developed, you may need
+   to do more, however. Users of Suspend2 usually start the process via a script
+   which prepares for the suspend, tells the kernel to do its stuff and then
+   restore things afterwards. This script might involve:
+
+   - Switching to a text console and back if X doesn't like the video card
+     status on resume.
+   - Un/reloading PCMCIA support since it doesn't play well with suspend.
+  
+   Note that you might not be able to unload some drivers if there are 
+   processes using them. You might have to kill off processes that hold
+   devices open. Hint: if your X server accesses an USB mouse, doing a
+   'chvt' to a text console releases the device and you can unload the
+   module.
+
+   Check out the latest script (available on suspend2.net).
+   
+4. Why not just use the version already in the kernel?
+
+   The version in the vanilla kernel has a number of drawbacks. Among these:
+	- it has a maximum image size of 1/2 total memory.
+	- it doesn't allocate storage until after it has snapshotted memory.
+	  This means that you can't be sure suspending will work until you
+	  see it start to write the image.
+	- it performs all of it's I/O synchronously.
+	- it does not allow you to press escape to cancel a cycle
+	- it does not allow you to automatically swapon a file when
+	  starting a cycle.
+	- it does not allow you to use multiple swap partitions.
+	- it does not allow you to use swapfiles.
+	- it does not allow you to use ordinary files.
+	- it just invalidates an image and continues to boot if you
+	  accidentally boot the wrong kernel after suspending.
+	- it doesn't support any sort of nice display while suspending
+	- it is moving toward requiring that you have an initrd/initramfs
+	  to ever have a hope of resuming (uswsusp). While uswsusp will
+	  address some of the concerns above, it won't address all, and
+	  will be more complicated to get set up.
+
+5. How do you use it?
+
+   A suspend cycle can be started directly by doing:
+
+	echo > /sys/power/suspend2/do_resume
+
+   In practice, though, you'll probably want to use the hibernate script
+   to unload modules, configure the kernel the way you like it and so on.
+   In that case, you'd do (as root):
+
+	hibernate
+
+   See the hibernate script's man page for more details on the options it
+   takes.
+
+   If you're using the text or splash user interface modules, one neat feature
+   of Suspend2 that you might find useful is that you can press Escape at any
+   time during suspending, and the process will be aborted.
+   
+   Due to the way suspend works, this means you'll have your system back and
+   perfectly usable almost instantly. The only exception is when it's at the
+   very end of writing the image. Then it will need to reload a small (
+   usually 4-50MBs, depending upon the image characteristics) portion first.
+
+   If you run into problems with resuming, adding the "noresume2" option to
+   the kernel command line will let you skip the resume step and recover your
+   system.
+
+6. What do all those entries in /sys/power/suspend2 do?
+
+   /sys/power/suspend2 is the directory which contains files you can use to
+   tune and configure Suspend2 to your liking. The exact contents of
+   the directory will depend upon the version of Suspend2 you're
+   running and the options you selected at compile time. In the following
+   descriptions, names in brackets refer to compile time options.
+   (Note that they're all dependant upon you having selected CONFIG_SUSPEND2
+   in the first place!).
+
+   Since the values of these settings can open potential security risks, they
+   are usually accessible only to the root user. You can, however, enable a
+   compile time option which makes all of these files world-accessible. This
+   should only be done if you trust everyone with shell access to this
+   computer!
+ 
+   - checksum/enabled
+
+   Use cryptoapi hashing routines to verify that Pageset2 pages don't change
+   while we're saving the first part of the image, and to get any pages that
+   do change resaved in the atomic copy. This should normally not be needed,
+   but if you're seeing issues, please enable this. If your issues stop you
+   being able to resume, enable this option, suspend and cancel the cycle
+   after the atomic copy is done. If the debugging info shows a non-zero
+   number of pages resaved, please report this to Nigel.
+ 
+   - compression/algorithm
+
+   Set the cryptoapi algorithm used for compressing the image.
+
+   - compression/expected_compression
+
+   These values allow you to set an expected compression ratio, which Software
+   Suspend will use in calculating whether it meets constraints on the image
+   size. If this expected compression ratio is not attained, the suspend will
+   abort, so it is wise to allow some spare. You can see what compression
+   ratio is achieved in the logs after suspending.
+
+   - debug_info:
+  
+   This file returns information about your configuration that may be helpful
+   in diagnosing problems with suspending.
+
+   - do_resume:
+
+   When anything is written to this file suspend will attempt to read and
+   restore an image. If there is no image, it will return almost immediately.
+   If an image exists, the echo > will never return. Instead, the original
+   kernel context will be restored and the original echo > do_suspend will
+   return.
+
+   - do_suspend:
+
+   When anything is written to this file, the kernel side of Suspend2 will
+   begin to attempt to write an image to disk and power down. You'll normally
+   want to run the hibernate script instead, to get modules unloaded first.
+
+   - driver_model_beeping
+
+   Enable beeping when suspending and resuming the drivers. Might help with
+   determining where a problem in resuming occurs.
+
+   - */enabled
+
+   These option can be used to temporarily disable various parts of suspend.
+
+   - encryption/*
+
+   The iv, key, save_key_and_iv, mode and algorithm values allow you to
+   select a cryptoapi encryption algoritm, set the iv and key and whether
+   they are saved in the image header. Saving the iv and key in the image
+   header is of course less secure than having them on some external device,
+   such as a USB key. If you want to use a USB key, you'll need to write
+   some scripting in your initrd/ramfs to retrieve the key & iv from your
+   USB key and put them into the entries again prior to doing the echo to
+   do_resume.
+
+   - extra_pages_allowance
+
+   When Suspend2 does its atomic copy, it calls the driver model suspend
+   and resume methods. If you have DRI enabled with a driver such as fglrx,
+   this can result in the driver allocating a substantial amount of memory
+   for storing its state. Extra_pages_allowance tells suspend2 how much
+   extra memory it should ensure is available for those allocations. If
+   your attempts at suspending end with a message in dmesg indicating that
+   insufficient extra pages were allowed, you need to increase this value.
+
+   - filewriter/target:
+
+   Read this value to get the current setting. Write to it to point Suspend
+   at a new storage location for the filewriter. See above for details of how
+   to set up the filewriter.
+
+   - freezer_test
+
+   This entry can be used to get Suspend2 to just test the freezer without
+   actually doing a suspend cycle. It is useful for diagnosing freezing
+   issues.
+
+   - image_exists:
+
+   Can be used in a script to determine whether a valid image exists at the
+   location currently pointed to by resume2=. Returns up to three lines.
+   The first is whether an image exists (-1 for unsure, otherwise 0 or 1).
+   If an image eixsts, additional lines will return the machine and version.
+   Echoing anything to this entry removes any current image.
+
+   - image_size_limit:
+
+   The maximum size of suspend image written to disk, measured in megabytes
+   (1024*1024).
+
+   - interface_version:
+
+   The value returned by this file can be used by scripts and configuration
+   tools to determine what entries should be looked for. The value is
+   incremented whenever an entry in /sys/power/suspend2 is obsoleted or 
+   added.
+
+   - last_result:
+
+   The result of the last suspend, as defined in
+   include/linux/suspend-debug.h with the values SUSPEND_ABORTED to
+   SUSPEND_KEPT_IMAGE. This is a bitmask.
+
+   - log_everything (CONFIG_PM_DEBUG):
+
+   Setting this option results in all messages printed being logged. Normally,
+   only a subset are logged, so as to not slow the process and not clutter the
+   logs. Useful for debugging. It can be toggled during a cycle by pressing
+   'L'.
+
+   - pause_between_steps (CONFIG_PM_DEBUG):
+
+   This option is used during debugging, to make Suspend2 pause between
+   each step of the process. It is ignored when the nice display is on.
+
+   - powerdown_method:
+
+   Used to select a method by which Suspend2 should powerdown after writing the
+   image. Currently:
+
+   0: Don't use ACPI to power off.
+   3: Attempt to enter Suspend-to-ram.
+   4: Attempt to enter ACPI S4 mode.
+   5: Attempt to power down via ACPI S5 mode.
+
+   Note that these options are highly dependant upon your hardware & software:
+
+   3: When succesful, your machine suspends-to-ram instead of powering off.
+      The advantage of using this mode is that it doesn't matter whether your
+      battery has enough charge to make it through to your next resume. If it
+      lasts, you will simply resume from suspend to ram (and the image on disk
+      will be discarded). If the battery runs out, you will resume from disk
+      instead. The disadvantage is that it takes longer than a normal
+      suspend-to-ram to enter the state, since the suspend-to-disk image needs
+      to be written first.
+   4/5: When successful, your machine will be off and comsume (almost) no power.
+      But it might still react to some external events like opening the lid or
+      trafic on  a network or usb device. For the bios, resume is then the same
+      as warm boot, similar to a situation where you used the command `reboot'
+      to reboot your machine. If your machine has problems on warm boot or if
+      you want to protect your machine with the bios password, this is probably
+      not the right choice. Mode 4 may be necessary on some machines where ACPI
+      wake up methods need to be run to properly reinitialise hardware after a
+      suspend-to-disk cycle.  
+   0: Switch the machine completely off. The only possible wakeup is the power
+      button. For the bios, resume is then the same as a cold boot, in
+      particular you would  have to provide your bios boot password if your
+      machine uses that feature for booting.
+
+   - progressbar_granularity_limit:
+
+   This option can be used to limit the granularity of the progress bar
+   displayed with a bootsplash screen. The value is the maximum number of
+   steps. That is, 10 will make the progress bar jump in 10% increments.
+
+   - reboot:
+
+   This option causes Suspend2 to reboot rather than powering down
+   at the end of saving an image. It can be toggled during a cycle by pressing
+   'R'.
+
+   - resume_commandline:
+
+   This entry can be read after resuming to see the commandline that was used
+   when resuming began. You might use this to set up two bootloader entries
+   that are the same apart from the fact that one includes a extra append=
+   argument "at_work=1". You could then grep resume_commandline in your
+   post-resume scripts and configure networking (for example) differently
+   depending upon whether you're at home or work. resume_commandline can be
+   set to arbitrary text if you wish to remove sensitive contents.
+
+   - swapwriter/swapfilename:
+
+   This entry is used to specify the swapfile or partition that
+   Suspend2 will attempt to swapon/swapoff automatically. Thus, if
+   I normally use /dev/hda1 for swap, and want to use /dev/hda2 for specifically
+   for my suspend image, I would
+  
+   echo /dev/hda2 > /sys/power/suspend2/swapwriter/swapfile
+
+   /dev/hda2 would then be automatically swapon'd and swapoff'd. Note that the
+   swapon and swapoff occur while other processes are frozen (including kswapd)
+   so this swap file will not be used up when attempting to free memory. The
+   parition/file is also given the highest priority, so other swapfiles/partitions
+   will only be used to save the image when this one is filled.
+
+   The value of this file is used by headerlocations along with any currently
+   activated swapfiles/partitions.
+
+   - swapwriter/headerlocations:
+
+   This option tells you the resume2= options to use for swap devices you
+   currently have activated. It is particularly useful when you only want to
+   use a swap file to store your image. See above for further details.
+
+   - toggle_process_nofreeze
+
+   This entry can be used to toggle the NOFREEZE flag on a process, to allow it
+   to run during Suspending. It should be used with extreme caution. There are
+   strict limitations on what a process running during suspend can do. This is
+   really only intended for use by Suspend's helpers (userui in particular).
+
+   - userui_program
+
+   This entry is used to tell Suspend what userspace program to use for
+   providing a user interface while suspending. The program uses a netlink
+   socket to pass messages back and forward to the kernel, allowing all of the
+   functions formerly implemented in the kernel user interface components.
+
+   - user_interface/debug_sections (CONFIG_PM_DEBUG):
+
+   This value, together with the console log level, controls what debugging
+   information is displayed. The console log level determines the level of
+   detail, and this value determines what detail is displayed. This value is
+   a bit vector, and the meaning of the bits can be found in the kernel tree
+   in include/linux/suspend2.h. It can be overridden using the kernel's
+   command line option suspend_dbg.
+
+   - user_interface/default_console_level (CONFIG_PM_DEBUG):
+
+   This determines the value of the console log level at the start of a
+   suspend cycle. If debugging is compiled in, the console log level can be
+   changed during a cycle by pressing the digit keys. Meanings are:
+
+   0: Nice display.
+   1: Nice display plus numerical progress.
+   2: Errors only.
+   3: Low level debugging info.
+   4: Medium level debugging info.
+   5: High level debugging info.
+   6: Verbose debugging info.
+
+   - user_interface/enable_escape:
+
+   Setting this to "1" will enable you abort a suspend by
+   pressing escape, "0" (default) disables this feature. Note that enabling
+   this option means that you cannot initiate a suspend and then walk away
+   from your computer, expecting it to be secure. With feature disabled,
+   you can validly have this expectation once Suspend begins to write the
+   image to disk. (Prior to this point, it is possible that Suspend might
+   about because of failure to freeze all processes or because constraints
+   on its ability to save the image are not met).
+
+   - version:
+  
+   The version of suspend you have compiled into the currently running kernel.
+
+7. How do you get support?
+
+   Glad you asked. Suspend2 is being actively maintained and supported
+   by Nigel (the guy doing most of the kernel coding at the moment), Bernard
+   (who maintains the hibernate script and userspace user interface components)
+   and its users.
+
+   Resources availble include HowTos, FAQs and a Wiki, all available via
+   suspend2.net.  You can find the mailing lists there.
+
+8. I think I've found a bug. What should I do?
+
+   By far and a way, the most common problems people have with suspend2
+   related to drivers not having adequate power management support. In this
+   case, it is not a bug with suspend2, but we can still help you. As we
+   mentioned above, such issues can usually be worked around by building the
+   functionality as modules and unloading them while suspending. Please visit
+   the Wiki for up-to-date lists of known issues and work arounds.
+
+   If this information doesn't help, try running:
+
+   hibernate --bug-report
+
+   ..and sending the output to the users mailing list.
+
+   Good information on how to provide us with useful information from an
+   oops is found in the file REPORTING-BUGS, in the top level directory
+   of the kernel tree. If you get an oops, please especially note the
+   information about running what is printed on the screen through ksymoops.
+   The raw information is useless.
+
+9. When will XXX be supported?
+
+   If there's a feature missing from Suspend2 that you'd like, feel free to
+   ask. We try to be obliging, within reason.
+
+   Patches are welcome. Please send to the list.
+
+10. How does it work?
+
+   Suspend2 does its work in a number of steps.
+
+   a. Freezing system activity.
+
+   The first main stage in suspending is to stop all other activity. This is
+   achieved in stages. Processes are considered in fours groups, which we will
+   describe in reverse order for clarity's sake: Threads with the PF_NOFREEZE
+   flag, kernel threads without this flag, userspace processes with the
+   PF_SYNCTHREAD flag and all other processes. The first set (PF_NOFREEZE) are
+   untouched by the refrigerator code. They are allowed to run during suspending
+   and resuming, and are used to support user interaction, storage access or the
+   like. Other kernel threads (those unneeded while suspending) are frozen last.
+   This leaves us with userspace processes that need to be frozen. When a
+   process enters one of the *_sync system calls, we set a PF_SYNCTHREAD flag on
+   that process for the duration of that call. Processes that have this flag are
+   frozen after processes without it, so that we can seek to ensure that dirty
+   data is synced to disk as quickly as possible in a situation where other
+   processes may be submitting writes at the same time. Freezing the processes
+   that are submitting data stops new I/O from being submitted. Syncthreads can
+   then cleanly finish their work. So the order is:
+
+   - Userspace processes without PF_SYNCTHREAD or PF_NOFREEZE;
+   - Userspace processes with PF_SYNCTHREAD (they won't have NOFREEZE);
+   - Kernel processes without PF_NOFREEZE.
+
+   b. Eating memory.
+
+   For a successful suspend, you need to have enough disk space to store the
+   image and enough memory for the various limitations of Suspend2's
+   algorithm. You can also specify a maximum image size. In order to attain
+   to those constraints, Suspend2 may 'eat' memory. If, after freezing
+   processes, the constraints aren't met, Suspend2 will thaw all the
+   other processes and begin to eat memory until its calculations indicate
+   the constraints are met. It will then freeze processes again and recheck
+   its calculations.
+
+   c. Allocation of storage.
+
+   Next, Suspend2 allocates the storage that will be used to save
+   the image.
+
+   The core of Suspend2 knows nothing about how or where pages are stored. We
+   therefore request the active writer (remember you might have compiled in
+   more than one!) to allocate enough storage for our expect image size. If
+   this request cannot be fulfilled, we eat more memory and try again. If it
+   is fulfiled, we seek to allocate additional storage, just in case our
+   expected compression ratio (if any) isn't achieved. This time, however, we
+   just continue if we can't allocate enough storage.
+
+   If these calls to our writer change the characteristics of the image such
+   that we haven't allocated enough memory, we also loop. (The writer may well
+   need to allocate space for its storage information).
+
+   d. Write the first part of the image.
+
+   Suspend2 stores the image in two sets of pages called 'pagesets'.
+   Pageset 2 contains pages on the active and inactive lists; essentially
+   the page cache. Pageset 1 contains all other pages, including the kernel.
+   We use two pagesets for one important reason: We need to make an atomic copy
+   of the kernel to ensure consistency of the image. Without a second pageset,
+   that would limit us to an image that was at most half the amount of memory
+   available. Using two pagesets allows us to store a full image. Since pageset
+   2 pages won't be needed in saving pageset 1, we first save pageset 2 pages.
+   We can then make our atomic copy of the remaining pages using both pageset 2
+   pages and any other pages that are free. While saving both pagesets, we are
+   careful not to corrupt the image. Among other things, we use lowlevel block
+   I/O routines that don't change the pagecache contents.
+
+   The next step, then, is writing pageset 2.
+
+   e. Suspending drivers and storing processor context.
+
+   Having written pageset2, Suspend2 calls the power management functions to
+   notify drivers of the suspend, and saves the processor state in preparation
+   for the atomic copy of memory we are about to make.
+
+   f. Atomic copy.
+
+   At this stage, everything else but the Suspend2 code is halted. Processes
+   are frozen or idling, drivers are quiesced and have stored (ideally and where
+   necessary) their configuration in memory we are about to atomically copy.
+   In our lowlevel architecture specific code, we have saved the CPU state.
+   We can therefore now do our atomic copy before resuming drivers etc.
+
+   g. Save the atomic copy (pageset 1).
+
+   Suspend can then write the atomic copy of the remaining pages. Since we
+   have copied the pages into other locations, we can continue to use the
+   normal block I/O routines without fear of corruption our image.
+
+   f. Save the suspend header.
+
+   Nearly there! We save our settings and other parameters needed for
+   reloading pageset 1 in a 'suspend header'. We also tell our writer to
+   serialise its data at this stage, so that it can reread the image at resume
+   time. Note that the writer can write this data in any format - in the case
+   of the swapwriter, for example, it splits header pages in 4092 byte blocks,
+   using the last four bytes to link pages of data together. This is completely
+   transparent to the core.
+
+   g. Set the image header.
+
+   Finally, we edit the header at our resume2= location. The signature is
+   changed by the writer to reflect the fact that an image exists, and to point
+   to the start of that data if necessary (swapwriter).
+
+   h. Power down.
+
+   Or reboot if we're debugging and the appropriate option is selected.
+
+   Whew!
+
+   Reloading the image.
+   --------------------
+
+   Reloading the image is essentially the reverse of all the above. We load
+   our copy of pageset 1, being careful to choose locations that aren't going
+   to be overwritten as we copy it back (We start very early in the boot
+   process, so there are no other processes to quiesce here). We then copy
+   pageset 1 back to its original location in memory and restore the process
+   context. We are now running with the original kernel. Next, we reload the
+   pageset 2 pages, free the memory and swap used by Suspend2, restore
+   the pageset header and restart processes. Sounds easy in comparison to
+   suspending, doesn't it!
+
+   There is of course more to Suspend2 than this, but this explanation
+   should be a good start. If there's interest, I'll write further
+   documentation on range pages and the low level I/O.
+
+11. Who wrote Suspend2?
+
+   (Answer based on the writings of Florent Chabaud, credits in files and
+   Nigel's limited knowledge; apologies to anyone missed out!)
+
+   The main developers of Suspend2 have been...
+
+   Gabor Kuti
+   Pavel Machek
+   Florent Chabaud
+   Bernard Blackham
+   Nigel Cunningham
+
+   They have been aided in their efforts by a host of hundreds, if not thousands
+   of testers and people who have submitted bug fixes & suggestions. Of special
+   note are the efforts of Michael Frank, who had his computers repetitively
+   suspend and resume for literally tens of thousands of cycles and developed
+   scripts to stress the system and test Suspend2 far beyond the point
+   most of us (Nigel included!) would consider testing. His efforts have
+   contributed as much to Suspend2 as any of the names above.
diff --git a/MAINTAINERS b/MAINTAINERS
index 277877a..f1adba1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3218,6 +3218,13 @@ M:	sammy@sammy.net
 W:	http://sammy.net/sun3/
 S:	Maintained
 
+SUSPEND2
+P:	Nigel Cunningham
+M:	nigel@suspend2.net
+L:	suspend2-devel@suspend2.net
+W:	http://suspend2.net
+S:	Maintained
+
 SVGA HANDLING
 P:	Martin Mares
 M:	mj@ucw.cz
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index b8c4e25..21982d9 100644
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -23,6 +23,7 @@
 #include <linux/module.h>
 #include <linux/kprobes.h>
 #include <linux/uaccess.h>
+#include <linux/suspend.h>
 
 #include <asm/system.h>
 #include <asm/desc.h>
@@ -33,6 +34,9 @@ extern void die(const char *,struct pt_regs *,long);
 
 static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
 
+int suspend2_faulted = 0;
+EXPORT_SYMBOL(suspend2_faulted);
+
 int register_page_fault_notifier(struct notifier_block *nb)
 {
 	vmalloc_sync_all();
@@ -311,6 +315,20 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs,
 
 	si_code = SEGV_MAPERR;
 
+	/* During a Suspend2 atomic copy, with DEBUG_SLAB, we will
+	 * get page faults where slab has been unmapped. Map them
+	 * temporarily and set the variable that tells Suspend2 to
+	 * unmap afterwards.
+	 */
+
+	if (unlikely(suspend2_running && !suspend2_faulted)) {
+		struct page *page = NULL;
+		suspend2_faulted = 1;
+		page = virt_to_page(address);
+		kernel_map_pages(page, 1, 1);
+		return;
+	}
+
 	/*
 	 * We fault-in kernel-space virtual memory on-demand. The
 	 * 'reference' page table is init_mm.pgd.
diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index ae43688..a180d21 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -387,7 +387,7 @@ static void __init pagetable_init (void)
 #endif
 }
 
-#if defined(CONFIG_SOFTWARE_SUSPEND) || defined(CONFIG_ACPI_SLEEP)
+#if defined(CONFIG_SUSPEND_SHARED) || defined(CONFIG_ACPI_SLEEP)
 /*
  * Swap suspend & friends need this for resume because things like the intel-agp
  * driver might have split up a kernel 4MB mapping.
@@ -774,13 +774,13 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
 	unsigned long addr;
 
 	for (addr = begin; addr < end; addr += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(addr));
-		init_page_count(virt_to_page(addr));
+		//ClearPageReserved(virt_to_page(addr));
+		//init_page_count(virt_to_page(addr));
 		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
-		free_page(addr);
-		totalram_pages++;
+		//free_page(addr);
+		//totalram_pages++;
 	}
-	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
+	//printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
 }
 
 void free_initmem(void)
diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c
index 412ebbd..dded2e1 100644
--- a/arch/i386/mm/pageattr.c
+++ b/arch/i386/mm/pageattr.c
@@ -252,7 +252,27 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
 	 */
 	__flush_tlb_all();
 }
+EXPORT_SYMBOL(kernel_map_pages);
 #endif
 
+int page_is_mapped(struct page *page)
+{
+	pte_t *kpte; 
+	unsigned long address;
+	struct page *kpte_page;
+
+	if(PageHighMem(page))
+		return 0;
+
+	address = (unsigned long)page_address(page);
+
+	kpte = lookup_address(address);
+	if (!kpte)
+		return -EINVAL;
+	kpte_page = virt_to_page(kpte);
+
+	return (pte_val(*kpte) & (__PAGE_KERNEL_EXEC | __PAGE_KERNEL)) ? 1:0;
+}
 EXPORT_SYMBOL(change_page_attr);
 EXPORT_SYMBOL(global_flush_tlb);
+EXPORT_SYMBOL(page_is_mapped);
diff --git a/arch/i386/power/Makefile b/arch/i386/power/Makefile
index 2de7bbf..72a6169 100644
--- a/arch/i386/power/Makefile
+++ b/arch/i386/power/Makefile
@@ -1,2 +1,2 @@
 obj-$(CONFIG_PM)		+= cpu.o
-obj-$(CONFIG_SOFTWARE_SUSPEND)	+= swsusp.o suspend.o
+obj-$(CONFIG_SUSPEND_SHARED)	+= swsusp.o suspend.o
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 8120d42..5d57f0c 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -36,7 +36,7 @@ obj-$(CONFIG_GENERIC_TBSYNC)	+= smp-tbsync.o
 obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
 obj-$(CONFIG_6xx)		+= idle_6xx.o l2cr_6xx.o cpu_setup_6xx.o
 obj-$(CONFIG_TAU)		+= tau_6xx.o
-obj32-$(CONFIG_SOFTWARE_SUSPEND) += swsusp_32.o
+obj32-$(CONFIG_SUSPEND_SHARED)	+= swsusp_32.o
 obj32-$(CONFIG_MODULES)		+= module_32.o
 
 ifeq ($(CONFIG_PPC_MERGE),y)
diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c
index 651fa42..243e5f4 100644
--- a/arch/powerpc/platforms/powermac/setup.c
+++ b/arch/powerpc/platforms/powermac/setup.c
@@ -425,7 +425,7 @@ static void __init find_boot_device(void)
  * only
  */
 
-#ifdef CONFIG_SOFTWARE_SUSPEND
+#ifdef CONFIG_SUSPEND_SHARED
 
 static int pmac_pm_prepare(suspend_state_t state)
 {
@@ -480,16 +480,16 @@ static struct pm_ops pmac_pm_ops = {
 	.valid		= pmac_pm_valid,
 };
 
-#endif /* CONFIG_SOFTWARE_SUSPEND */
+#endif /* CONFIG_SUSPEND_SHARED */
 
 static int initializing = 1;
 
 static int pmac_late_init(void)
 {
 	initializing = 0;
-#ifdef CONFIG_SOFTWARE_SUSPEND
+#ifdef CONFIG_SUSPEND_SHARED
 	pm_set_ops(&pmac_pm_ops);
-#endif /* CONFIG_SOFTWARE_SUSPEND */
+#endif /* CONFIG_SUSPEND_SHARED */
 	return 0;
 }
 
diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index bb47e86..9943190 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -26,7 +26,7 @@ obj-y				+= io_apic.o mpparse.o \
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o crash.o
 obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
 obj-$(CONFIG_PM)		+= suspend.o
-obj-$(CONFIG_SOFTWARE_SUSPEND)	+= suspend_asm.o
+obj-$(CONFIG_SUSPEND_SHARED)	+= suspend_asm.o
 obj-$(CONFIG_CPU_FREQ)		+= cpufreq/
 obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 obj-$(CONFIG_IOMMU)		+= pci-gart.o aperture.o
diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c
index 91f7e67..983f16f 100644
--- a/arch/x86_64/kernel/suspend.c
+++ b/arch/x86_64/kernel/suspend.c
@@ -140,7 +140,7 @@ void fix_processor_context(void)
 
 }
 
-#ifdef CONFIG_SOFTWARE_SUSPEND
+#ifdef CONFIG_SUSPEND_SHARED
 /* Defined in arch/x86_64/kernel/suspend_asm.S */
 extern int restore_image(void);
 
@@ -219,4 +219,4 @@ int swsusp_arch_resume(void)
 	restore_image();
 	return 0;
 }
-#endif /* CONFIG_SOFTWARE_SUSPEND */
+#endif /* CONFIG_SUSPEND_SHARED */
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 086fcec..efde46c 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -406,6 +406,14 @@ config CRYPTO_DEFLATE
 	  
 	  You will most probably want this if using IPSec.
 
+config CRYPTO_LZF
+	tristate "LZF compression algorithm"
+	default y
+	select CRYPTO_ALGAPI
+	help
+	  This is the LZF algorithm. It is especially useful for Suspend2,
+	  because it achieves good compression quickly.
+
 config CRYPTO_MICHAEL_MIC
 	tristate "Michael MIC keyed digest algorithm"
 	select CRYPTO_ALGAPI
diff --git a/crypto/Makefile b/crypto/Makefile
index 12f93f5..69a8af3 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -46,5 +46,6 @@ obj-$(CONFIG_CRYPTO_ANUBIS) += anubis.o
 obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
 obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
 obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
+obj-$(CONFIG_CRYPTO_LZF) += lzf.o
 
 obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o
diff --git a/crypto/lzf.c b/crypto/lzf.c
new file mode 100644
index 0000000..7c74784
--- /dev/null
+++ b/crypto/lzf.c
@@ -0,0 +1,325 @@
+/* 
+ * Cryptoapi LZF compression module.
+ *
+ * Copyright (c) 2004-2005 Nigel Cunningham <nigel@suspend2.net>
+ *
+ * based on the deflate.c file:
+ * 
+ * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
+ * 
+ * and upon the LZF compression module donated to the Suspend2 project with
+ * the following copyright:
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com>
+ * 
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, are permitted provided that the following conditions are met:
+ * 
+ *   1.  Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ * 
+ *   2.  Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ * 
+ *   3.  The name of the author may not be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License version 2 (the "GPL"), in which case the
+ * provisions of the GPL are applicable instead of the above. If you wish to
+ * allow the use of your version of this file only under the terms of the
+ * GPL and not to allow others to use your version of this file under the
+ * BSD license, indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by the GPL. If
+ * you do not delete the provisions above, a recipient may use your version
+ * of this file under either the BSD or the GPL.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/err.h>
+#include <linux/vmalloc.h>
+#include <asm/string.h>
+
+struct lzf_ctx {
+	void *hbuf;
+	unsigned int bufofs;
+};
+
+/*
+ * size of hashtable is (1 << hlog) * sizeof (char *)
+ * decompression is independent of the hash table size
+ * the difference between 15 and 14 is very small
+ * for small blocks (and 14 is also faster).
+ * For a low-memory configuration, use hlog == 13;
+ * For best compression, use 15 or 16.
+ */
+static const int hlog = 14;
+
+/*
+ * don't play with this unless you benchmark!
+ * decompression is not dependent on the hash function
+ * the hashing function might seem strange, just believe me
+ * it works ;)
+ */
+static inline u16 first(const u8 *p)
+{
+	return ((p[0]) << 8) + p[1];
+}
+
+static inline u16 next(u8 v, const u8 *p)
+{
+	return ((v) << 8) + p[2];
+}
+
+static inline u32 idx(unsigned int h)
+{
+	return (((h ^ (h << 5)) >> (3*8 - hlog)) + h*3) & ((1 << hlog) - 1);
+}
+
+/*
+ * IDX works because it is very similar to a multiplicative hash, e.g.
+ * (h * 57321 >> (3*8 - hlog))
+ * the next one is also quite good, albeit slow ;)
+ * (int)(cos(h & 0xffffff) * 1e6)
+ */
+
+static const int max_lit = (1 <<  5);
+static const int max_off = (1 << 13);
+static const int max_ref = ((1 <<  8) + (1 << 3));
+
+/*
+ * compressed format
+ *
+ * 000LLLLL <L+1>    ; literal
+ * LLLOOOOO oooooooo ; backref L
+ * 111OOOOO LLLLLLLL oooooooo ; backref L+7
+ *
+ */
+
+static void lzf_compress_exit(struct crypto_tfm *tfm)
+{
+	struct lzf_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	if (!ctx->hbuf)
+		return;
+
+	vfree(ctx->hbuf);
+	ctx->hbuf = NULL;
+}
+
+static int lzf_compress_init(struct crypto_tfm *tfm)
+{
+	struct lzf_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	/* Get LZF ready to go */
+	ctx->hbuf = vmalloc_32((1 << hlog) * sizeof(char *));
+	if (ctx->hbuf)
+		return 0;
+
+	printk(KERN_WARNING "Failed to allocate %ld bytes for lzf workspace\n",
+			(long) ((1 << hlog) * sizeof(char *)));
+	return -ENOMEM;
+}
+
+static int lzf_compress(struct crypto_tfm *tfm, const u8 *in_data,
+		unsigned int in_len, u8 *out_data, unsigned int *out_len)
+{
+	struct lzf_ctx *ctx = crypto_tfm_ctx(tfm);
+	const u8 **htab = ctx->hbuf;
+	const u8 **hslot;
+	const u8 *ip = in_data;
+	u8 *op = out_data;
+	const u8 *in_end = ip + in_len;
+	u8 *out_end = op + *out_len - 3;
+	const u8 *ref;
+
+	unsigned int hval = first(ip);
+	unsigned long off;
+	int lit = 0;
+
+	memset(htab, 0, sizeof(htab));
+
+	for (;;) {
+		if (ip < in_end - 2) {
+			hval = next(hval, ip);
+			hslot = htab + idx(hval);
+			ref = *hslot;
+			*hslot = ip;
+
+			if ((off = ip - ref - 1) < max_off
+			    && ip + 4 < in_end && ref > in_data
+			    && *(u16 *) ref == *(u16 *) ip && ref[2] == ip[2]
+			    ) {
+				/* match found at *ref++ */
+				unsigned int len = 2;
+				unsigned int maxlen = in_end - ip - len;
+				maxlen = maxlen > max_ref ? max_ref : maxlen;
+
+				do
+					len++;
+				while (len < maxlen && ref[len] == ip[len]);
+
+				if (op + lit + 1 + 3 >= out_end) {
+					*out_len = PAGE_SIZE;
+					return 0;
+				}
+
+				if (lit) {
+					*op++ = lit - 1;
+					lit = -lit;
+					do
+						*op++ = ip[lit];
+					while (++lit);
+				}
+
+				len -= 2;
+				ip++;
+
+				if (len < 7) {
+					*op++ = (off >> 8) + (len << 5);
+				} else {
+					*op++ = (off >> 8) + (7 << 5);
+					*op++ = len - 7;
+				}
+
+				*op++ = off;
+
+				ip += len;
+				hval = first(ip);
+				hval = next(hval, ip);
+				htab[idx(hval)] = ip;
+				ip++;
+				continue;
+			}
+		} else if (ip == in_end)
+			break;
+
+		/* one more literal byte we must copy */
+		lit++;
+		ip++;
+
+		if (lit == max_lit) {
+			if (op + 1 + max_lit >= out_end) {
+				*out_len = PAGE_SIZE;
+				return 0;
+			}
+
+			*op++ = max_lit - 1;
+			memcpy(op, ip - max_lit, max_lit);
+			op += max_lit;
+			lit = 0;
+		}
+	}
+
+	if (lit) {
+		if (op + lit + 1 >= out_end) {
+			*out_len = PAGE_SIZE;
+			return 0;
+		}
+
+		*op++ = lit - 1;
+		lit = -lit;
+		do
+			*op++ = ip[lit];
+		while (++lit);
+	}
+
+	*out_len = op - out_data;
+	return 0;
+}
+
+static int lzf_decompress(struct crypto_tfm *tfm, const u8 *src,
+		unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+	u8 const *ip = src;
+	u8 *op = dst;
+	u8 const *const in_end = ip + slen;
+	u8 *const out_end = op + *dlen;
+
+	*dlen = PAGE_SIZE;
+	do {
+		unsigned int ctrl = *ip++;
+
+		if (ctrl < (1 << 5)) {	/* literal run */
+			ctrl++;
+
+			if (op + ctrl > out_end)
+				return 0;
+			memcpy(op, ip, ctrl);
+			op += ctrl;
+			ip += ctrl;
+		} else {	/* back reference */
+
+			unsigned int len = ctrl >> 5;
+
+			u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
+
+			if (len == 7)
+				len += *ip++;
+
+			ref -= *ip++;
+			len += 2;
+
+			if (op + len > out_end || ref < (u8 *) dst)
+				return 0;
+
+			do
+				*op++ = *ref++;
+			while (--len);
+		}
+	}
+	while (op < out_end && ip < in_end);
+
+	*dlen = op - (u8 *) dst;
+	return 0;
+}
+
+static struct crypto_alg alg = {
+	.cra_name = "lzf",
+	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
+	.cra_ctxsize = 0,
+	.cra_module = THIS_MODULE,
+	.cra_list = LIST_HEAD_INIT(alg.cra_list),
+	.cra_init = lzf_compress_init,
+	.cra_exit = lzf_compress_exit,
+	.cra_u = { .compress = {
+	.coa_compress = lzf_compress,
+	.coa_decompress = lzf_decompress } }
+};
+
+static int __init init(void)
+{
+	return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+	crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LZF Compression Algorithm");
+MODULE_AUTHOR("Marc Alexander Lehmann & Nigel Cunningham");
diff --git a/drivers/base/core.c b/drivers/base/core.c
index d7fcf82..edbbf76 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -27,6 +27,8 @@
 int (*platform_notify)(struct device * dev) = NULL;
 int (*platform_notify_remove)(struct device * dev) = NULL;
 
+static int do_dump_stack;
+
 /*
  * sysfs bindings for devices.
  */
@@ -638,6 +640,18 @@ int device_add(struct device *dev)
 				class_intf->add_dev(dev, class_intf);
 		up(&dev->class->sem);
 	}
+
+#ifdef CONFIG_PM
+	if (!((dev->class && dev->class->resume) ||
+	      (dev->bus && (dev->bus->resume || dev->bus->resume_early))) &&
+	    !dev->pm_safe) {
+		printk("Device driver %s lacks bus and class support for "
+				"being resumed.\n", kobject_name(&dev->kobj));
+		if (do_dump_stack)
+			dump_stack();
+	}
+#endif
+
  Done:
  	kfree(class_name);
 	put_device(dev);
@@ -975,6 +989,7 @@ struct device *device_create(struct class *class, struct device *parent,
 	dev->class = class;
 	dev->parent = parent;
 	dev->release = device_create_release;
+	dev->pm_safe = 1;
 
 	va_start(args, fmt);
 	vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
@@ -1183,3 +1198,11 @@ out:
 }
 
 EXPORT_SYMBOL_GPL(device_move);
+
+static int __init pm_debug_dump_stack(char *str)
+{
+	do_dump_stack = 1;
+	return 1;
+}
+
+__setup("pm_debug_dump_stack", pm_debug_dump_stack);
diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index b6073bd..32bd423 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -42,7 +42,6 @@
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/sysdev.h>
-#include <linux/freezer.h>
 #include <linux/syscalls.h>
 #include <linux/suspend.h>
 #include <linux/cpu.h>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 509171c..76e5ac8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5309,6 +5309,8 @@ void md_do_sync(mddev_t *mddev)
 			last_mark = next;
 		}
 
+		while(freezer_is_on())
+			yield();
 
 		if (kthread_should_stop()) {
 			/*
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index a3c1755..171be82 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -451,6 +451,10 @@ int __pci_register_driver(struct pci_driver *drv, struct module *owner,
 	if (error)
 		driver_unregister(&drv->driver);
 
+	if (!drv->resume)
+		printk("PCI driver %s lacks driver specific resume support.\n",
+				drv->name);
+
 	return error;
 }
 
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 9e3e943..e91fdef 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -788,6 +788,9 @@ int usb_register_driver(struct usb_driver *new_driver, struct module *owner,
 			usbcore_name, new_driver->name);
 		usbfs_update_special();
 		usb_create_newid_file(new_driver);
+		if (!new_driver->resume)
+			printk("USB driver %s lacks resume support.\n",
+					new_driver->name);
 	} else {
 		printk(KERN_ERR "%s: error %d registering interface "
 			"	driver %s\n",
diff --git a/include/asm-i386/cacheflush.h b/include/asm-i386/cacheflush.h
index 74e03c8..3bb8575 100644
--- a/include/asm-i386/cacheflush.h
+++ b/include/asm-i386/cacheflush.h
@@ -36,4 +36,6 @@ void kernel_map_pages(struct page *page, int numpages, int enable);
 void mark_rodata_ro(void);
 #endif
 
+extern int page_is_mapped(struct page *page);
+
 #endif /* _I386_CACHEFLUSH_H */
diff --git a/include/asm-i386/suspend.h b/include/asm-i386/suspend.h
index 8dbaafe..e23fd20 100644
--- a/include/asm-i386/suspend.h
+++ b/include/asm-i386/suspend.h
@@ -8,6 +8,9 @@
 
 static inline int arch_prepare_suspend(void) { return 0; }
 
+extern int suspend2_faulted;
+#define clear_suspend2_fault() do { suspend2_faulted = 0; } while(0)
+
 /* image of the saved processor state */
 struct saved_context {
   	u16 es, fs, gs, ss;
diff --git a/include/asm-ppc/suspend.h b/include/asm-ppc/suspend.h
index 3df9f32..9d5db0e 100644
--- a/include/asm-ppc/suspend.h
+++ b/include/asm-ppc/suspend.h
@@ -10,3 +10,6 @@ static inline void save_processor_state(void)
 static inline void restore_processor_state(void)
 {
 }
+
+#define suspend2_faulted (0)
+#define clear_suspend2_fault() do { } while(0)
diff --git a/include/asm-x86_64/cacheflush.h b/include/asm-x86_64/cacheflush.h
index ab1cb5c..b8e7def 100644
--- a/include/asm-x86_64/cacheflush.h
+++ b/include/asm-x86_64/cacheflush.h
@@ -32,4 +32,9 @@ int change_page_attr_addr(unsigned long addr, int numpages, pgprot_t prot);
 void mark_rodata_ro(void);
 #endif
 
+static inline int page_is_mapped(struct page *page)
+{
+	return 1;
+}
+
 #endif /* _X8664_CACHEFLUSH_H */
diff --git a/include/asm-x86_64/suspend.h b/include/asm-x86_64/suspend.h
index bc7f817..2f18e1b 100644
--- a/include/asm-x86_64/suspend.h
+++ b/include/asm-x86_64/suspend.h
@@ -12,6 +12,9 @@ arch_prepare_suspend(void)
 	return 0;
 }
 
+#define suspend2_faulted (0)
+#define clear_suspend2_fault() do { } while(0)
+
 /* Image of the saved processor state. If you touch this, fix acpi_wakeup.S. */
 struct saved_context {
   	u16 ds, es, fs, gs, ss;
diff --git a/include/linux/device.h b/include/linux/device.h
index 5cf30e9..69122c1 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -402,6 +402,7 @@ struct device {
 	char	bus_id[BUS_ID_SIZE];	/* position on parent bus */
 	struct device_type	*type;
 	unsigned		is_registered:1;
+	unsigned		pm_safe:1; /* No resume fn is ok? */
 	struct device_attribute uevent_attr;
 	struct device_attribute *devt_attr;
 
diff --git a/include/linux/dyn_pageflags.h b/include/linux/dyn_pageflags.h
new file mode 100644
index 0000000..23d9127
--- /dev/null
+++ b/include/linux/dyn_pageflags.h
@@ -0,0 +1,68 @@
+/*
+ * include/linux/dyn_pageflags.h
+ *
+ * Copyright (C) 2004-2006 Nigel Cunningham <nigel@suspend2.net>
+ *
+ * This file is released under the GPLv2.
+ *
+ * It implements support for dynamically allocated bitmaps that are
+ * used for temporary or infrequently used pageflags, in lieu of
+ * bits in the struct page flags entry.
+ */
+
+#ifndef DYN_PAGEFLAGS_H
+#define DYN_PAGEFLAGS_H
+
+#include <linux/mm.h>
+
+/* [pg_dat][zone][page_num] */
+typedef unsigned long **** dyn_pageflags_t;
+
+#if BITS_PER_LONG == 32
+#define UL_SHIFT 5
+#else 
+#if BITS_PER_LONG == 64
+#define UL_SHIFT 6
+#else
+#error Bits per long not 32 or 64?
+#endif
+#endif
+
+#define BIT_NUM_MASK (sizeof(unsigned long) * 8 - 1)
+#define PAGE_NUM_MASK (~((1 << (PAGE_SHIFT + 3)) - 1))
+#define UL_NUM_MASK (~(BIT_NUM_MASK | PAGE_NUM_MASK))
+
+/*
+ * PAGENUMBER gives the index of the page within the zone.
+ * PAGEINDEX gives the index of the unsigned long within that page.
+ * PAGEBIT gives the index of the bit within the unsigned long.
+ */
+#define BITS_PER_PAGE (PAGE_SIZE << 3)
+#define PAGENUMBER(zone_offset) ((int) (zone_offset >> (PAGE_SHIFT + 3)))
+#define PAGEINDEX(zone_offset) ((int) ((zone_offset & UL_NUM_MASK) >> UL_SHIFT))
+#define PAGEBIT(zone_offset) ((int) (zone_offset & BIT_NUM_MASK))
+
+#define PAGE_UL_PTR(bitmap, node, zone_num, zone_pfn) \
+       ((bitmap[node][zone_num][PAGENUMBER(zone_pfn)])+PAGEINDEX(zone_pfn))
+
+#define BITMAP_FOR_EACH_SET(bitmap, counter) \
+	for (counter = get_next_bit_on(bitmap, max_pfn + 1); counter <= max_pfn; \
+		counter = get_next_bit_on(bitmap, counter))
+
+extern void clear_dyn_pageflags(dyn_pageflags_t pagemap);
+extern int allocate_dyn_pageflags(dyn_pageflags_t *pagemap);
+extern void free_dyn_pageflags(dyn_pageflags_t *pagemap);
+extern unsigned long get_next_bit_on(dyn_pageflags_t bitmap, unsigned long counter);
+
+extern int test_dynpageflag(dyn_pageflags_t *bitmap, struct page *page);
+extern void set_dynpageflag(dyn_pageflags_t *bitmap, struct page *page);
+extern void clear_dynpageflag(dyn_pageflags_t *bitmap, struct page *page);
+#endif
+
+/* 
+ * With the above macros defined, you can do...
+ * #define PagePageset1(page) (test_dynpageflag(&pageset1_map, page))
+ * #define SetPagePageset1(page) (set_dynpageflag(&pageset1_map, page))
+ * #define ClearPagePageset1(page) (clear_dynpageflag(&pageset1_map, page))
+ */
+
diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 5e75e26..f49c9be 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -1,7 +1,10 @@
-/* Freezer declarations */
+#ifndef LINUX_FREEZER_H
+#define LINUX_FREEZER_H
 
 #include <linux/sched.h>
 
+/* Freezer declarations */
+
 #ifdef CONFIG_PM
 /*
  * Check if a process has been frozen
@@ -73,6 +76,18 @@ static inline int try_to_freeze(void)
 
 extern void thaw_some_processes(int all);
 
+extern int freezer_state;
+#define FREEZER_OFF 0
+#define FREEZER_USERSPACE_FROZEN 1
+#define FREEZER_FULLY_ON 2
+
+static inline int freezer_is_on(void)
+{
+	return (freezer_state == FREEZER_FULLY_ON);
+}
+
+extern void thaw_kernel_threads(void);
+
 #else
 static inline int frozen(struct task_struct *p) { return 0; }
 static inline int freezing(struct task_struct *p) { return 0; }
@@ -85,6 +100,9 @@ static inline int freeze_processes(void) { BUG(); return 0; }
 static inline void thaw_processes(void) {}
 
 static inline int try_to_freeze(void) { return 0; }
+static inline int freezer_is_on(void) { return 0; }
+static inline void thaw_kernel_threads(void) { }
 
 
 #endif
+#endif
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 9ddf25c..c18ec95 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -113,6 +113,8 @@ extern int vsprintf(char *buf, const char *, va_list)
 	__attribute__ ((format (printf, 2, 0)));
 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
 	__attribute__ ((format (printf, 3, 4)));
+extern int snprintf_used(char *buffer, int buffer_size,
+		const char *fmt, ...);
 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 	__attribute__ ((format (printf, 3, 0)));
 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 2a20f48..b4d9db1 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -24,6 +24,8 @@
 /* leave room for NETLINK_DM (DM Events) */
 #define NETLINK_SCSITRANSPORT	18	/* SCSI Transports */
 #define NETLINK_ECRYPTFS	19
+#define NETLINK_SUSPEND2_USERUI	20	/* For suspend2's userui */
+#define NETLINK_SUSPEND2_USM	21	/* For suspend2's userspace storage manager */
 
 #define MAX_LINKS 32		
 
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index bf99bd4..02c1184 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -27,14 +27,9 @@ extern void mark_free_pages(struct zone *zone);
 /* kernel/power/swsusp.c */
 extern int software_suspend(void);
 
-#if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
 extern int pm_prepare_console(void);
 extern void pm_restore_console(void);
 #else
-static inline int pm_prepare_console(void) { return 0; }
-static inline void pm_restore_console(void) {}
-#endif /* defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) */
-#else
 static inline int software_suspend(void)
 {
 	printk("Warning: fake suspend called\n");
@@ -45,8 +40,6 @@ static inline int software_suspend(void)
 void save_processor_state(void);
 void restore_processor_state(void);
 struct saved_context;
-void __save_processor_state(struct saved_context *ctxt);
-void __restore_processor_state(struct saved_context *ctxt);
 unsigned long get_safe_page(gfp_t gfp_mask);
 
 /*
@@ -55,4 +48,81 @@ unsigned long get_safe_page(gfp_t gfp_mask);
  */
 #define PAGES_FOR_IO	1024
 
+enum {
+	SUSPEND_CAN_SUSPEND,
+	SUSPEND_CAN_RESUME,
+	SUSPEND_RUNNING,
+	SUSPEND_RESUME_DEVICE_OK,
+	SUSPEND_NORESUME_SPECIFIED,
+	SUSPEND_SANITY_CHECK_PROMPT,
+	SUSPEND_PAGESET2_NOT_LOADED,
+	SUSPEND_CONTINUE_REQ,
+	SUSPEND_RESUMED_BEFORE,
+	SUSPEND_RESUME_NOT_DONE,
+	SUSPEND_BOOT_TIME,
+	SUSPEND_NOW_RESUMING,
+	SUSPEND_IGNORE_LOGLEVEL,
+	SUSPEND_TRYING_TO_RESUME,
+	SUSPEND_TRY_RESUME_RD,
+	SUSPEND_LOADING_ALT_IMAGE,
+	SUSPEND_STOP_RESUME,
+	SUSPEND_IO_STOPPED,
+};
+
+#ifdef CONFIG_SUSPEND2
+
+/* Used in init dir files */
+extern unsigned long suspend_state;
+#define set_suspend_state(bit) (set_bit(bit, &suspend_state))
+#define clear_suspend_state(bit) (clear_bit(bit, &suspend_state))
+#define test_suspend_state(bit) (test_bit(bit, &suspend_state))
+extern int suspend2_running;
+
+#else /* !CONFIG_SUSPEND2 */
+
+#define suspend_state		(0)
+#define set_suspend_state(bit) do { } while(0)
+#define clear_suspend_state(bit) do { } while (0)
+#define test_suspend_state(bit) (0)
+#define suspend2_running (0)
+#endif /* CONFIG_SUSPEND2 */
+
+#ifdef CONFIG_SUSPEND_SHARED
+#ifdef CONFIG_SUSPEND2
+extern void suspend2_try_resume(void);
+#else
+#define suspend2_try_resume() do { } while(0)
+#endif
+
+extern int resume_attempted;
+
+#ifdef CONFIG_SOFTWARE_SUSPEND
+extern int software_resume(void);
+#else
+static inline int software_resume(void)
+{
+	resume_attempted = 1;
+	suspend2_try_resume();
+	return 0;
+}
+#endif
+
+static inline void check_resume_attempted(void)
+{
+	if (resume_attempted)
+		return;
+
+	software_resume();
+}
+#else
+#define check_resume_attempted() do { } while(0)
+#define resume_attempted (0)
+#endif
+
+#ifdef CONFIG_PRINTK_NOSAVE
+#define POSS_NOSAVE __nosavedata
+#else
+#define POSS_NOSAVE
+#endif
+
 #endif /* _LINUX_SWSUSP_H */
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 0068688..ad3fead 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -190,8 +190,9 @@ extern void swap_setup(void);
 /* linux/mm/vmscan.c */
 extern unsigned long try_to_free_pages(struct zone **, gfp_t,
 				       struct task_struct *p);
 extern unsigned long shrink_all_memory(unsigned long nr_pages);
+extern void shrink_one_zone(struct zone *zone, int desired_size);
 extern int vm_mapped;
 extern int vm_hardmaplimit;
 extern int remove_mapping(struct address_space *mapping, struct page *page);
 extern long vm_total_pages;
@@ -368,5 +369,10 @@ static inline swp_entry_t get_swap_page(void)
 #define disable_swap_token() do { } while(0)
 
 #endif /* CONFIG_SWAP */
+
+/* For Suspend2 - unlink LRU pages while saving separately */
+void unlink_lru_lists(void);
+void relink_lru_lists(void);
+
 #endif /* __KERNEL__*/
 #endif /* _LINUX_SWAP_H */
diff --git a/include/linux/time.h b/include/linux/time.h
index 8ea8dea..5c07f00 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -224,4 +224,7 @@ struct itimerval {
  */
 #define TIMER_ABSTIME			0x01
 
+extern void save_avenrun(void);
+extern void restore_avenrun(void);
+
 #endif
diff --git a/init/do_mounts.c b/init/do_mounts.c
index dc1ec08..3e67387 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -139,11 +139,16 @@ dev_t name_to_dev_t(char *name)
 	char s[32];
 	char *p;
 	dev_t res = 0;
-	int part;
+	int part, mount_result;
 
 #ifdef CONFIG_SYSFS
 	int mkdir_err = sys_mkdir("/sys", 0700);
-	if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
+	/* 
+	 * When changing resume2 parameter for Software Suspend, sysfs may
+	 * already be mounted. 
+	 */
+	mount_result = sys_mount("sysfs", "/sys", "sysfs", 0, NULL);
+	if (mount_result < 0 && mount_result != -EBUSY)
 		goto out;
 #endif
 
@@ -195,7 +200,8 @@ dev_t name_to_dev_t(char *name)
 	res = try_name(s, part);
 done:
 #ifdef CONFIG_SYSFS
-	sys_umount("/sys", 0);
+	if (mount_result >= 0)
+		sys_umount("/sys", 0);
 out:
 	if (!mkdir_err)
 		sys_rmdir("/sys");
@@ -434,12 +440,27 @@ void __init prepare_namespace(void)
 
 	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
 
+	/* Suspend2:
+	 * By this point, suspend_early_init has been called to initialise our
+	 * sysfs interface. If modules are built in, they have registered (all
+	 * of the above via initcalls).
+	 * 
+	 * We have not yet looked to see if an image exists, however. If we
+	 * have an initrd, it is expected that the user will have set it up
+	 * to echo > /sys/power/suspend2/do_resume and thus initiate any
+	 * resume. If they don't do that, we do it immediately after the initrd
+	 * is finished (major issues if they mount filesystems rw from the
+	 * initrd! - they are warned. If there's no usable initrd, we do our
+	 * check next.
+	 */
 	if (initrd_load())
 		goto out;
 
 	if (is_floppy && rd_doload && rd_load_disk(0))
 		ROOT_DEV = Root_RAM0;
 
+	check_resume_attempted();
+
 	mount_root();
 out:
 	sys_mount(".", "/", NULL, MS_MOVE, NULL);
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 2cfd7cb..9c24ec4 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -6,6 +6,7 @@
 #include <linux/romfs_fs.h>
 #include <linux/initrd.h>
 #include <linux/sched.h>
+#include <linux/suspend.h>
 #include <linux/freezer.h>
 
 #include "do_mounts.h"
@@ -58,10 +59,18 @@ static void __init handle_initrd(void)
 	current->flags |= PF_NOFREEZE;
 	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
 	if (pid > 0) {
-		while (pid != sys_wait4(-1, NULL, 0, NULL))
+		while (pid != sys_wait4(-1, NULL, 0, NULL)) {
 			yield();
+			try_to_freeze();
+		}
 	}
 
+	if (!resume_attempted)
+		printk(KERN_ERR "Suspend2: No attempt was made to resume from "
+				"any image that might exist.\n");
+	clear_suspend_state(SUSPEND_BOOT_TIME);
+	current->flags &= ~PF_NOFREEZE;
+
 	/* move initrd to rootfs' /old */
 	sys_fchdir(old_fd);
 	sys_mount("/", ".", NULL, MS_MOVE, NULL);
diff --git a/init/main.c b/init/main.c
index a92989e..cd3f60f 100644
--- a/init/main.c
+++ b/init/main.c
@@ -54,6 +54,7 @@
 #include <linux/lockdep.h>
 #include <linux/pid_namespace.h>
 #include <linux/device.h>
+#include <linux/suspend.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -804,7 +805,9 @@ static int __init init(void * unused)
 
 	/*
 	 * check if there is an early userspace init.  If yes, let it do all
-	 * the work
+	 * the work. For suspend2, we assume that it will do the right thing
+	 * with regard to trying to resume at the right place. When that
+	 * happens, the BOOT_TIME flag will be cleared.
 	 */
 
 	if (!ramdisk_execute_command)
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 7962761..f0d6fc1 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -34,6 +34,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/resource.h>
+#include <linux/freezer.h>
 #include <asm/uaccess.h>
 
 extern int max_threads;
@@ -338,6 +339,11 @@ int call_usermodehelper_pipe(char *path, char **argv, char **envp,
 	}
 	sub_info.stdin = f;
 
+	if (freezer_is_on()) {
+		printk(KERN_WARNING "Freezer is on. Refusing to start %s.\n", path);
+		return -EBUSY;
+	}
+
 	queue_work(khelper_wq, &sub_info.work);
 	wait_for_completion(&done);
 	return sub_info.retval;
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 51a4dd0..4caac70 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -48,6 +48,18 @@ config DISABLE_CONSOLE_SUSPEND
 	suspend/resume routines, but may itself lead to problems, for example
 	if netconsole is used.
 
+config PRINTK_NOSAVE
+	depends on PM && PM_DEBUG
+	bool "Preserve printk data from boot kernel when resuming."
+	default n
+	---help---
+	This option gives printk data and the associated variables the
+	attribute __nosave, which means that they will not be saved as
+	part of the image. The net effect is that after resuming, your
+	dmesg will show the messages from prior to the atomic restore,
+	instead of the messages from the resumed kernel. This may be
+	useful for debugging hibernation.
+
 config PM_TRACE
 	bool "Suspend/resume event tracing"
 	depends on PM && PM_DEBUG && X86_32 && EXPERIMENTAL
@@ -162,3 +174,174 @@ config APM_EMULATION
 	  random kernel OOPSes or reboots that don't seem to be related to
 	  anything, try disabling/enabling this option (or disabling/enabling
 	  APM in your BIOS).
+
+menuconfig SUSPEND2_CORE
+	tristate "Suspend2"
+	depends on PM
+	select DYN_PAGEFLAGS
+	select HOTPLUG_CPU if SMP
+	default y
+	---help---
+	  Suspend2 is the 'new and improved' suspend support.
+	  
+	  See the Suspend2 home page (suspend2.net)
+	  for FAQs, HOWTOs and other documentation.
+
+	comment "Image Storage (you need at least one allocator)"
+		depends on SUSPEND2_CORE
+	
+	config SUSPEND2_FILE
+		tristate "File Allocator"
+		depends on SUSPEND2_CORE
+		default y
+		---help---
+		  This option enables support for storing an image in a
+		  simple file. This should be possible, but we're still
+		  testing it.
+
+	config SUSPEND2_SWAP
+		tristate "Swap Allocator"
+		depends on SUSPEND2_CORE
+		default y
+		select SWAP
+		---help---
+		  This option enables support for storing an image in your
+		  swap space.
+
+	comment "General Options"
+		depends on SUSPEND2_CORE
+
+	config SUSPEND2_CRYPTO
+		tristate "Compression support"
+		depends on SUSPEND2_CORE && CRYPTO
+		default y
+		---help---
+		  This option adds support for using cryptoapi compression
+		  algorithms. Compression is particularly useful as
+		  the LZF support that comes with the Suspend2 patch can double
+		  your suspend and resume speed.
+
+		  You probably want this, so say Y here.
+
+	comment "No compression support available without Cryptoapi support."
+		depends on SUSPEND2_CORE && !CRYPTO
+
+	config SUSPEND2_USERUI
+		tristate "Userspace User Interface support"
+		depends on SUSPEND2_CORE && NET
+		default y
+		---help---
+		  This option enabled support for a userspace based user interface
+		  to Suspend2, which allows you to have a nice display while suspending
+		  and resuming, and also enables features such as pressing escape to
+		  cancel a cycle or interactive debugging.
+
+	config SUSPEND2_DEFAULT_RESUME2
+		string "Default resume device name"
+		depends on SUSPEND2_CORE
+		---help---
+		  You normally need to add a resume2= parameter to your lilo.conf or
+		  equivalent. With this option properly set, the kernel has a value
+		  to default. No damage will be done if the value is invalid.
+
+	config SUSPEND2_KEEP_IMAGE
+		bool "Allow Keep Image Mode"
+		depends on SUSPEND2_CORE
+		---help---
+		  This option allows you to keep and image and reuse it. It is intended
+		  __ONLY__ for use with systems where all filesystems are mounted read-
+		  only (kiosks, for example). To use it, compile this option in and boot
+		  normally. Set the KEEP_IMAGE flag in /sys/power/suspend2 and suspend.
+		  When you resume, the image will not be removed. You will be unable to turn
+		  off swap partitions (assuming you are using the swap allocator), but future
+		  suspends simply do a power-down. The image can be updated using the
+		  kernel command line parameter suspend_act= to turn off the keep image
+		  bit. Keep image mode is a little less user friendly on purpose - it
+		  should not be used without thought!
+
+	config SUSPEND2_REPLACE_SWSUSP
+		bool "Replace swsusp by default"
+		default y
+		depends on SUSPEND2_CORE
+		---help---
+		  Suspend2 can replace swsusp. This option makes that the default state,
+		  requiring you to echo 0 > /sys/power/suspend2/replace_swsusp if you want
+		  to use the vanilla kernel functionality. Note that your initrd/ramfs will
+		  need to do this before trying to resume, too.
+		  With overriding swsusp enabled, Suspend2 will use both the resume= and
+		  noresume commandline options _and_ the resume2= and noresume2 ones (for
+		  compatibility). resume= takes precedence over resume2=. Echoing disk 
+		  to /sys/power/state will start a Suspend2 cycle. If resume= doesn't
+		  specify an allocator and both the swap and file allocators are compiled in,
+		  the swap allocator will be used by default.
+
+	config SUSPEND2_CLUSTER
+		tristate "Cluster support"
+		default n
+		depends on SUSPEND2_CORE && NET && BROKEN
+		---help---
+		  Support for linking multiple machines in a cluster so that they suspend
+		  and resume together.
+
+	config SUSPEND2_DEFAULT_CLUSTER_MASTER
+		string "Default cluster master address/port"
+		depends on SUSPEND2_CLUSTER
+		---help---
+		  If this machine will be the master, simply enter a port on which to
+		  listen for slaves.
+		  If this machine will be a slave, enter the ip address and port on
+		  which the master listens with a colon separating them.
+		  If no value is set here, cluster support will be disabled by default.
+
+	config SUSPEND2_CHECKSUM
+		bool "Checksum pageset2"
+		depends on SUSPEND2_CORE
+		select CRYPTO
+		select CRYPTO_ALGAPI
+		select CRYPTO_MD5
+		---help---
+		  Adds support for checksumming pageset2 pages, to ensure you really get an
+		  atomic copy. Should not normally be needed, but here for verification and
+		  diagnostic purposes.
+
+config SUSPEND_SHARED
+	bool
+	depends on SUSPEND2_CORE || SOFTWARE_SUSPEND
+	default y
+
+config SUSPEND2_USERUI_EXPORTS
+	bool
+	depends on SUSPEND2_USERUI=m
+	default y
+
+config SUSPEND2_SWAP_EXPORTS
+	bool
+	depends on SUSPEND2_SWAP=m
+	default y
+
+config SUSPEND2_FILE_EXPORTS
+	bool
+	depends on SUSPEND2_FILE=m
+	default y
+
+config SUSPEND2_CRYPTO_EXPORTS
+	bool
+	depends on SUSPEND2_CRYPTO=m
+	default y
+
+config SUSPEND2_CORE_EXPORTS
+	bool
+	depends on SUSPEND2_CORE=m
+	default y
+
+config SUSPEND2_EXPORTS
+	bool
+	depends on SUSPEND2_SWAP_EXPORTS || SUSPEND2_FILE_EXPORTS || \
+		SUSPEND2_CRYPTO_EXPORTS || SUSPEND2_CLUSTER=m || \
+		SUSPEND2_USERUI_EXPORTS
+	default y
+
+config SUSPEND2
+	bool
+	depends on SUSPEND2_CORE!=n
+	default y
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 38725f5..a4a8c5b 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -5,6 +5,32 @@ endif
 
 obj-y				:= main.o process.o console.o
 obj-$(CONFIG_PM_LEGACY)		+= pm.o
-obj-$(CONFIG_SOFTWARE_SUSPEND)	+= swsusp.o disk.o snapshot.o swap.o user.o
+obj-$(CONFIG_SUSPEND_SHARED)	+= snapshot.o
+
+suspend_core-objs := modules.o sysfs.o suspend.o \
+		io.o pagedir.o prepare_image.o \
+		extent.o pageflags.o ui.o \
+		power_off.o atomic_copy.o
+
+obj-$(CONFIG_SUSPEND2)		+= suspend2_builtin.o
+
+ifdef CONFIG_SUSPEND2_CHECKSUM
+suspend_core-objs	+= checksum.o
+endif
+
+ifdef CONFIG_NET
+suspend_core-objs	+= storage.o netlink.o
+endif
+
+obj-$(CONFIG_SUSPEND2_CORE)	+= suspend_core.o
+obj-$(CONFIG_SUSPEND2_CRYPTO)	+= suspend_compress.o
+
+obj-$(CONFIG_SUSPEND2_SWAP)	+= suspend_block_io.o suspend_swap.o
+obj-$(CONFIG_SUSPEND2_FILE)	+= suspend_block_io.o suspend_file.o
+obj-$(CONFIG_SUSPEND2_CLUSTER)	+= cluster.o
+
+obj-$(CONFIG_SUSPEND2_USERUI)	+= suspend_userui.o
+
+obj-$(CONFIG_SOFTWARE_SUSPEND)	+= swsusp.o disk.o swap.o user.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)	+= poweroff.o
diff --git a/kernel/power/atomic_copy.c b/kernel/power/atomic_copy.c
new file mode 100644
index 0000000..d2b8cd7
--- /dev/null
+++ b/kernel/power/atomic_copy.c
@@ -0,0 +1,416 @@
+/*
+ * kernel/power/atomic_copy.c
+ *
+ * Copyright 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * Distributed under GPLv2.
+ *
+ * Routines for doing the atomic save/restore.
+ */
+
+#include <linux/suspend.h>
+#include <linux/highmem.h>
+#include <linux/cpu.h>
+#include <linux/freezer.h>
+#include <linux/console.h>
+#include "suspend.h"
+#include "storage.h"
+#include "power_off.h"
+#include "ui.h"
+#include "power.h"
+#include "io.h"
+#include "prepare_image.h"
+#include "pageflags.h"
+#include "checksum.h"
+#include "suspend2_builtin.h"
+
+int extra_pd1_pages_used;
+
+/*
+ * Highmem related functions (x86 only).
+ */
+
+#ifdef CONFIG_HIGHMEM
+
+/**
+ * copyback_high: Restore highmem pages.
+ *
+ * Highmem data and pbe lists are/can be stored in highmem.
+ * The format is slightly different to the lowmem pbe lists
+ * used for the assembly code: the last pbe in each page is
+ * a struct page * instead of struct pbe *, pointing to the
+ * next page where pbes are stored (or NULL if happens to be
+ * the end of the list). Since we don't want to generate
+ * unnecessary deltas against swsusp code, we use a cast
+ * instead of a union.
+ **/
+
+static void copyback_high(void)
+{
+	struct page * pbe_page = (struct page *) restore_highmem_pblist;
+	struct pbe *this_pbe, *first_pbe;
+	unsigned long *origpage, *copypage;
+	int pbe_index = 1;
+
+	if (!pbe_page)
+		return;
+
+	this_pbe = (struct pbe *) kmap_atomic(pbe_page, KM_BOUNCE_READ);
+	first_pbe = this_pbe;
+
+	while (this_pbe) {
+		int loop = (PAGE_SIZE / sizeof(unsigned long)) - 1;
+
+		origpage = kmap_atomic((struct page *) this_pbe->orig_address,
+			KM_BIO_DST_IRQ);
+		copypage = kmap_atomic((struct page *) this_pbe->address,
+			KM_BIO_SRC_IRQ);
+
+		while (loop >= 0) {
+			*(origpage + loop) = *(copypage + loop);
+			loop--;
+		}
+
+		kunmap_atomic(origpage, KM_BIO_DST_IRQ);
+		kunmap_atomic(copypage, KM_BIO_SRC_IRQ);
+
+		if (!this_pbe->next)
+			break;
+
+		if (pbe_index < PBES_PER_PAGE) {
+			this_pbe++;
+			pbe_index++;
+		} else {
+			pbe_page = (struct page *) this_pbe->next;
+			kunmap_atomic(first_pbe, KM_BOUNCE_READ);
+			if (!pbe_page)
+				return;
+			this_pbe = (struct pbe *) kmap_atomic(pbe_page,
+					KM_BOUNCE_READ);
+			first_pbe = this_pbe;
+			pbe_index = 1;
+		}
+	}
+	kunmap_atomic(first_pbe, KM_BOUNCE_READ);
+}
+
+#else /* CONFIG_HIGHMEM */
+void copyback_high(void) { }
+#endif
+
+/**
+ * free_pbe_list: Free page backup entries used by the atomic copy code.
+ *
+ * Normally, this function isn't used. If, however, we need to abort before
+ * doing the atomic copy, we use this to free the pbes previously allocated.
+ **/
+static void free_pbe_list(struct pbe **list, int highmem)
+{
+	struct pbe *free_pbe = *list;
+	struct page *page = (struct page *) free_pbe;
+
+	do {
+		int i;
+
+		if (highmem)
+			free_pbe = (struct pbe *) kmap(page);
+
+		for (i = 0; i < PBES_PER_PAGE; i++) {
+			if (!free_pbe)
+				break;
+			__free_page(free_pbe->address);
+			free_pbe = free_pbe->next;
+		}
+
+		if (highmem) {
+			struct page *next_page = NULL;
+			if (free_pbe)
+				next_page = (struct page *) free_pbe->next;
+			kunmap(page);
+			__free_page(page);
+			page = next_page;
+		}
+
+	} while(page && free_pbe);
+
+	*list = NULL;
+}
+
+/**
+ * copyback_post: Post atomic-restore actions.
+ *
+ * After doing the atomic restore, we have a few more things to do:
+ * 1) We want to retain some values across the restore, so we now copy
+ * these from the nosave variables to the normal ones.
+ * 2) Set the status flags.
+ * 3) Resume devices.
+ * 4) Get userui to redraw.
+ * 5) Reread the page cache.
+ **/
+
+void copyback_post(void)
+{
+	int loop;
+
+	suspend_action = suspend2_nosave_state1;
+	suspend_debug_state = suspend2_nosave_state2;
+	console_loglevel = suspend2_nosave_state3;
+
+	for (loop = 0; loop < 4; loop++)
+		suspend_io_time[loop/2][loop%2] =
+			suspend2_nosave_io_speed[loop/2][loop%2];
+
+	set_suspend_state(SUSPEND_NOW_RESUMING);
+	set_suspend_state(SUSPEND_PAGESET2_NOT_LOADED);
+
+	if (suspend_activate_storage(1))
+		panic("Failed to reactivate our storage.");
+
+	suspend_ui_redraw();
+
+	suspend_cond_pause(1, "About to reload secondary pagedir.");
+
+	if (read_pageset2(0))
+		panic("Unable to successfully reread the page cache.");
+
+	clear_suspend_state(SUSPEND_PAGESET2_NOT_LOADED);
+}
+
+/**
+ * suspend_copy_pageset1: Do the atomic copy of pageset1.
+ *
+ * Make the atomic copy of pageset1. We can't use copy_page (as we once did)
+ * because we can't be sure what side effects it has. On my old Duron, with
+ * 3DNOW, kernel_fpu_begin increments preempt count, making our preempt
+ * count at resume time 4 instead of 3.
+ * 
+ * We don't want to call kmap_atomic unconditionally because it has the side
+ * effect of incrementing the preempt count, which will leave it one too high
+ * post resume (the page containing the preempt count will be copied after
+ * its incremented. This is essentially the same problem.
+ **/
+
+void suspend_copy_pageset1(void)
+{
+	int i;
+	unsigned long source_index, dest_index;
+
+	source_index = get_next_bit_on(pageset1_map, max_pfn + 1);
+	dest_index = get_next_bit_on(pageset1_copy_map, max_pfn + 1);
+
+	for (i = 0; i < pagedir1.size; i++) {
+		unsigned long *origvirt, *copyvirt;
+		struct page *origpage, *copypage;
+		int loop = (PAGE_SIZE / sizeof(unsigned long)) - 1;
+
+		origpage = pfn_to_page(source_index);
+		copypage = pfn_to_page(dest_index);
+		
+		origvirt = PageHighMem(origpage) ?
+			kmap_atomic(origpage, KM_USER0) :
+			page_address(origpage);
+
+	       	copyvirt = PageHighMem(copypage) ?
+			kmap_atomic(copypage, KM_USER1) :
+			page_address(copypage);
+
+		while (loop >= 0) {
+			*(copyvirt + loop) = *(origvirt + loop);
+			loop--;
+		}
+		
+		if (PageHighMem(origpage))
+			kunmap_atomic(origvirt, KM_USER0);
+		else if (suspend2_faulted) {
+			printk("%p (%lu) being unmapped after faulting during atomic copy.\n", origpage, source_index);
+			kernel_map_pages(origpage, 1, 0);
+			clear_suspend2_fault();
+		}
+
+		if (PageHighMem(copypage))
+			kunmap_atomic(copyvirt, KM_USER1);
+		
+		source_index = get_next_bit_on(pageset1_map, source_index);
+		dest_index = get_next_bit_on(pageset1_copy_map, dest_index);
+	}
+}
+
+/**
+ * __suspend_post_context_save: Steps after saving the cpu context.
+ *
+ * Steps taken after saving the CPU state to make the actual
+ * atomic copy.
+ *
+ * Called from swsusp_save in snapshot.c via suspend_post_context_save.
+ **/
+
+int __suspend_post_context_save(void)
+{
+	int old_ps1_size = pagedir1.size;
+	
+	calculate_check_checksums(1);
+
+	free_checksum_pages();
+
+	suspend_recalculate_image_contents(1);
+
+	extra_pd1_pages_used = pagedir1.size - old_ps1_size;
+
+	if (extra_pd1_pages_used > extra_pd1_pages_allowance) {
+		printk("Pageset1 has grown by %d pages. "
+			"extra_pages_allowance is currently only %d.\n",
+			pagedir1.size - old_ps1_size,
+			extra_pd1_pages_allowance);
+		set_result_state(SUSPEND_ABORTED);
+		set_result_state(SUSPEND_EXTRA_PAGES_ALLOW_TOO_SMALL);
+		return -1;
+	}
+
+	if (!test_action_state(SUSPEND_TEST_FILTER_SPEED) &&
+	    !test_action_state(SUSPEND_TEST_BIO))
+		suspend_copy_pageset1();
+
+	return 0;
+}
+
+/**
+ * suspend2_suspend: High level code for doing the atomic copy.
+ *
+ * High-level code which prepares to do the atomic copy. Loosely based
+ * on the swsusp version, but with the following twists:
+ * - We set suspend2_running so the swsusp code uses our code paths.
+ * - We give better feedback regarding what goes wrong if there is a problem.
+ * - We use an extra function to call the assembly, just in case this code
+ *   is in a module (return address).
+ **/
+
+int suspend2_suspend(void)
+{
+	int error;
+
+	suspend2_running = 1; /* For the swsusp code we use :< */
+
+	if (test_action_state(SUSPEND_PM_PREPARE_CONSOLE))
+		pm_prepare_console();
+
+	if ((error = arch_prepare_suspend()))
+		goto err_out;
+
+	local_irq_disable();
+
+	/* At this point, device_suspend() has been called, but *not*
+	 * device_power_down(). We *must* device_power_down() now.
+	 * Otherwise, drivers for some devices (e.g. interrupt controllers)
+	 * become desynchronized with the actual state of the hardware
+	 * at resume time, and evil weirdness ensues.
+	 */
+
+	if ((error = device_power_down(PMSG_FREEZE))) {
+		set_result_state(SUSPEND_DEVICE_REFUSED);
+		set_result_state(SUSPEND_ABORTED);
+		printk(KERN_ERR "Some devices failed to power down, aborting suspend\n");
+		goto enable_irqs;
+	}
+
+	error = suspend2_lowlevel_builtin();
+
+	if (!suspend2_in_suspend)
+		copyback_high();
+
+	device_power_up();
+enable_irqs:
+	local_irq_enable();
+	if (test_action_state(SUSPEND_PM_PREPARE_CONSOLE))
+		pm_restore_console();
+err_out:
+	suspend2_running = 0;
+	return error;
+}
+
+/**
+ * suspend_atomic_restore: Prepare to do the atomic restore.
+ *
+ * Get ready to do the atomic restore. This part gets us into the same
+ * state we are in prior to do calling do_suspend2_lowlevel while
+ * suspending: hot-unplugging secondary cpus and freeze processes,
+ * before starting the thread that will do the restore.
+ **/
+
+int suspend_atomic_restore(void)
+{
+	int error, loop;
+
+	suspend2_running = 1;
+
+	suspend_prepare_status(DONT_CLEAR_BAR,	"Prepare console");
+
+	if (test_action_state(SUSPEND_PM_PREPARE_CONSOLE))
+		pm_prepare_console();
+
+	suspend_prepare_status(DONT_CLEAR_BAR,	"Device suspend.");
+
+	suspend_console();
+	if ((error = device_suspend(PMSG_PRETHAW))) {
+		printk("Some devices failed to suspend\n");
+		goto device_resume;
+	}
+
+	if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) {
+		suspend_prepare_status(DONT_CLEAR_BAR,	"Disable nonboot cpus.");
+		if (disable_nonboot_cpus()) {
+			set_result_state(SUSPEND_CPU_HOTPLUG_FAILED);
+			set_result_state(SUSPEND_ABORTED);
+			goto device_resume;
+		}
+	}
+
+	suspend_prepare_status(DONT_CLEAR_BAR,	"Atomic restore preparation");
+
+	suspend2_nosave_state1 = suspend_action;
+	suspend2_nosave_state2 = suspend_debug_state;
+	suspend2_nosave_state3 = console_loglevel;
+	
+	for (loop = 0; loop < 4; loop++)
+		suspend2_nosave_io_speed[loop/2][loop%2] =
+			suspend_io_time[loop/2][loop%2];
+	memcpy(suspend2_nosave_commandline, saved_command_line, COMMAND_LINE_SIZE);
+
+	mb();
+
+	local_irq_disable();
+
+	if (device_power_down(PMSG_FREEZE)) {
+		printk(KERN_ERR "Some devices failed to power down. Very bad.\n");
+		goto device_power_up;
+	}
+
+	/* We'll ignore saved state, but this gets preempt count (etc) right */
+	save_processor_state();
+
+	error = swsusp_arch_resume();
+	/* 
+	 * Code below is only ever reached in case of failure. Otherwise
+	 * execution continues at place where swsusp_arch_suspend was called.
+	 *
+	 * We don't know whether it's safe to continue (this shouldn't happen),
+	 * so lets err on the side of caution.
+         */
+	BUG();
+
+device_power_up:
+	device_power_up();
+	if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG))
+		enable_nonboot_cpus();
+device_resume:
+	device_resume();
+	resume_console();
+	free_pbe_list(&restore_pblist, 0);
+#ifdef CONFIG_HIGHMEM
+	free_pbe_list(&restore_highmem_pblist, 1);
+#endif
+	if (test_action_state(SUSPEND_PM_PREPARE_CONSOLE))
+		pm_restore_console();
+	suspend2_running = 0;
+	return 1;
+}
diff --git a/kernel/power/block_io.h b/kernel/power/block_io.h
new file mode 100644
index 0000000..49eaa51
--- /dev/null
+++ b/kernel/power/block_io.h
@@ -0,0 +1,55 @@
+/*
+ * kernel/power/block_io.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * Distributed under GPLv2.
+ *
+ * This file contains declarations for functions exported from
+ * block_io.c, which contains low level io functions.
+ */
+
+#include <linux/buffer_head.h>
+#include "extent.h"
+
+struct suspend_bdev_info {
+	struct block_device *bdev;
+	dev_t dev_t;
+	int bmap_shift;
+	int blocks_per_page;
+};
+
+/* 
+ * Our exported interface so the swapwriter and filewriter don't
+ * need these functions duplicated.
+ */
+struct suspend_bio_ops {
+	int (*bdev_page_io) (int rw, struct block_device *bdev, long pos,
+			struct page *page);
+	void (*check_io_stats) (void);
+	void (*reset_io_stats) (void);
+	void (*finish_all_io) (void);
+	int (*forward_one_page) (void);
+	void (*set_extra_page_forward) (void);
+	void (*set_devinfo) (struct suspend_bdev_info *info);
+	int (*read_chunk) (unsigned long *index, struct page *buffer_page,
+			unsigned int *buf_size, int sync);
+	int (*write_chunk) (unsigned long index, struct page *buffer_page,
+			unsigned int buf_size);
+	void (*read_header_init) (void);
+	int (*rw_header_chunk) (int rw, struct suspend_module_ops *owner,
+			char *buffer, int buffer_size);
+	int (*write_header_chunk_finish) (void);
+	int (*rw_init) (int rw, int stream_number);
+	int (*rw_cleanup) (int rw);
+};
+
+extern struct suspend_bio_ops suspend_bio_ops;
+
+extern char *suspend_writer_buffer;
+extern int suspend_writer_buffer_posn;
+extern int suspend_read_fd;
+extern struct extent_iterate_saved_state suspend_writer_posn_save[3];
+extern struct extent_iterate_state suspend_writer_posn;
+extern int suspend_header_bytes_used;
diff --git a/kernel/power/checksum.c b/kernel/power/checksum.c
new file mode 100644
index 0000000..356af21
--- /dev/null
+++ b/kernel/power/checksum.c
@@ -0,0 +1,371 @@
+/*
+ * kernel/power/checksum.c
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains data checksum routines for suspend2,
+ * using cryptoapi. They are used to locate any modifications
+ * made to pageset 2 while we're saving it.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/vmalloc.h>
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+
+#include "suspend.h"
+#include "modules.h"
+#include "sysfs.h"
+#include "io.h"
+#include "pageflags.h"
+#include "checksum.h"
+#include "pagedir.h"
+
+static struct suspend_module_ops suspend_checksum_ops;
+
+/* Constant at the mo, but I might allow tuning later */
+static char suspend_checksum_name[32] = "md5";
+/* Bytes per checksum */
+#define CHECKSUM_SIZE (128 / 8)
+
+#define CHECKSUMS_PER_PAGE ((PAGE_SIZE - sizeof(void *)) / CHECKSUM_SIZE)
+
+static struct crypto_hash *suspend_checksum_transform;
+static struct hash_desc desc;
+static int pages_allocated;
+static unsigned long page_list;
+
+static int suspend_num_resaved = 0;
+
+#if 1
+#define PRINTK(a, b...) do { } while(0)
+#else
+#define PRINTK(a, b...) do { printk(a, ##b); } while(0)
+#endif
+
+/* ---- Local buffer management ---- */
+
+/* 
+ * suspend_checksum_cleanup
+ *
+ * Frees memory allocated for our labours.
+ */
+static void suspend_checksum_cleanup(int ending_cycle)
+{
+	if (ending_cycle && suspend_checksum_transform) {
+		crypto_free_hash(suspend_checksum_transform);
+		suspend_checksum_transform = NULL;
+		desc.tfm = NULL;
+	}
+}
+
+/* 
+ * suspend_crypto_prepare
+ *
+ * Prepare to do some work by allocating buffers and transforms.
+ * Returns: Int: Zero. Even if we can't set up checksum, we still
+ * seek to suspend.
+ */
+static int suspend_checksum_prepare(int starting_cycle)
+{
+	if (!starting_cycle || !suspend_checksum_ops.enabled)
+		return 0;
+
+	if (!*suspend_checksum_name) {
+		printk("Suspend2: No checksum algorithm name set.\n");
+		return 1;
+	}
+
+	suspend_checksum_transform = crypto_alloc_hash(suspend_checksum_name, 0, 0);
+	if (IS_ERR(suspend_checksum_transform)) {
+		printk("Suspend2: Failed to initialise the %s checksum algorithm: %ld.\n",
+				suspend_checksum_name,
+				(long) suspend_checksum_transform);
+		suspend_checksum_transform = NULL;
+		return 1;
+	}
+
+	desc.tfm = suspend_checksum_transform;
+	desc.flags = 0;
+
+	return 0;
+}
+
+static int suspend_print_task_if_using_page(struct task_struct *t, struct page *seeking)
+{
+	struct vm_area_struct *vma;
+	struct mm_struct *mm;
+	int result = 0;
+
+	mm = t->active_mm;
+
+	if (!mm || !mm->mmap) return 0;
+
+	/* Don't try to take the sem when processes are frozen, 
+	 * drivers are suspended and irqs are disabled. We're
+	 * not racing with anything anyway.  */
+	if (!irqs_disabled())
+		down_read(&mm->mmap_sem);
+	
+	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+		if (vma->vm_flags & VM_PFNMAP)
+			continue;
+		if (vma->vm_start) {
+			unsigned long posn;
+			for (posn = vma->vm_start; posn < vma->vm_end;
+					posn += PAGE_SIZE) {
+				struct page *page = 
+					follow_page(vma, posn, 0);
+				if (page == seeking) {
+					printk("%s(%d)", t->comm, t->pid);
+					result = 1;
+					goto out;
+				}
+			}
+		}
+	}
+
+out:
+	if (!irqs_disabled())
+		up_read(&mm->mmap_sem);
+
+	return result;
+}
+
+static void print_tasks_using_page(struct page *seeking)
+{
+	struct task_struct *p;
+
+	read_lock(&tasklist_lock);
+	for_each_process(p) {
+		if (suspend_print_task_if_using_page(p, seeking))
+			printk(" ");
+	}
+	read_unlock(&tasklist_lock);
+}
+
+/* 
+ * suspend_checksum_print_debug_stats
+ * @buffer: Pointer to a buffer into which the debug info will be printed.
+ * @size: Size of the buffer.
+ *
+ * Print information to be recorded for debugging purposes into a buffer.
+ * Returns: Number of characters written to the buffer.
+ */
+
+static int suspend_checksum_print_debug_stats(char *buffer, int size)
+{
+	int len;
+
+	if (!suspend_checksum_ops.enabled)
+		return snprintf_used(buffer, size,
+			"- Checksumming disabled.\n");
+	
+	len = snprintf_used(buffer, size, "- Checksum method is '%s'.\n",
+			suspend_checksum_name);
+	len+= snprintf_used(buffer + len, size - len,
+		"  %d pages resaved in atomic copy.\n", suspend_num_resaved);
+	return len;
+}
+
+static int suspend_checksum_storage_needed(void)
+{
+	if (suspend_checksum_ops.enabled)
+		return strlen(suspend_checksum_name) + sizeof(int) + 1;
+	else
+		return 0;
+}
+
+/* 
+ * suspend_checksum_save_config_info
+ * @buffer: Pointer to a buffer of size PAGE_SIZE.
+ *
+ * Save informaton needed when reloading the image at resume time.
+ * Returns: Number of bytes used for saving our data.
+ */
+static int suspend_checksum_save_config_info(char *buffer)
+{
+	int namelen = strlen(suspend_checksum_name) + 1;
+	int total_len;
+	
+	*((unsigned int *) buffer) = namelen;
+	strncpy(buffer + sizeof(unsigned int), suspend_checksum_name, 
+								namelen);
+	total_len = sizeof(unsigned int) + namelen;
+	return total_len;
+}
+
+/* suspend_checksum_load_config_info
+ * @buffer: Pointer to the start of the data.
+ * @size: Number of bytes that were saved.
+ *
+ * Description:	Reload information needed for dechecksuming the image at
+ * resume time.
+ */
+static void suspend_checksum_load_config_info(char *buffer, int size)
+{
+	int namelen;
+
+	namelen = *((unsigned int *) (buffer));
+	strncpy(suspend_checksum_name, buffer + sizeof(unsigned int),
+			namelen);
+	return;
+}
+
+/*
+ * Free Checksum Memory
+ */
+
+void free_checksum_pages(void)
+{
+	PRINTK("Freeing %d checksum pages.\n", pages_allocated);
+	while (pages_allocated) {
+		unsigned long next = *((unsigned long *) page_list);
+		PRINTK("Page %3d is at %lx and points to %lx.\n", pages_allocated, page_list, next);
+		ClearPageNosave(virt_to_page(page_list));
+		free_page((unsigned long) page_list);
+		page_list = next;
+		pages_allocated--;
+	}
+}
+
+/*
+ * Allocate Checksum Memory
+ */
+
+int allocate_checksum_pages(void)
+{
+	int pages_needed = DIV_ROUND_UP(pagedir2.size, CHECKSUMS_PER_PAGE);
+
+	if (!suspend_checksum_ops.enabled)
+		return 0;
+
+	PRINTK("Need %d checksum pages for %ld pageset2 pages.\n", pages_needed, pagedir2.size);
+	while (pages_allocated < pages_needed) {
+		unsigned long *new_page =
+			(unsigned long *) get_zeroed_page(GFP_ATOMIC);
+		if (!new_page)
+			return -ENOMEM;
+		SetPageNosave(virt_to_page(new_page));
+		(*new_page) = page_list;
+		page_list = (unsigned long) new_page;
+		pages_allocated++;
+		PRINTK("Page %3d is at %lx and points to %lx.\n", pages_allocated, page_list, *((unsigned long *) page_list));
+	}
+
+	return 0;
+}
+
+#if 0
+static void print_checksum(char *buf, int size)
+{
+	int index;
+
+	for (index = 0; index < size; index++)
+		printk("%x ", buf[index]);
+
+	printk("\n");
+}
+#endif
+
+/*
+ * Calculate checksums
+ */
+
+void calculate_check_checksums(int check)
+{
+	int pfn, index = 0;
+	unsigned long next_page, this_checksum = 0;
+	struct scatterlist sg[2];
+	char current_checksum[CHECKSUM_SIZE];
+
+	if (!suspend_checksum_ops.enabled)
+		return;
+
+	next_page = (unsigned long) page_list;
+
+	if (check)
+		suspend_num_resaved = 0;
+
+	BITMAP_FOR_EACH_SET(pageset2_map, pfn) {
+		int ret;
+		if (index % CHECKSUMS_PER_PAGE) {
+			this_checksum += CHECKSUM_SIZE;
+		} else {
+			this_checksum = next_page + sizeof(void *);
+			next_page = *((unsigned long *) next_page);
+		}
+		PRINTK("Put checksum for page %3d %p in %lx.\n", index, page_address(pfn_to_page(pfn)), this_checksum);
+		sg_set_buf(&sg[0], page_address(pfn_to_page(pfn)), PAGE_SIZE);
+		if (check) {
+			ret = crypto_hash_digest(&desc, sg, 
+					PAGE_SIZE, current_checksum);
+			if (memcmp(current_checksum, (char *) this_checksum, CHECKSUM_SIZE)) {
+				SetPageResave(pfn_to_page(pfn));
+				printk("Page %d changed. Saving in atomic copy."
+					"Processes using it:", pfn);
+				print_tasks_using_page(pfn_to_page(pfn));
+				printk("\n");
+				suspend_num_resaved++;
+				if (test_action_state(SUSPEND_ABORT_ON_RESAVE_NEEDED))
+					set_result_state(SUSPEND_ABORTED);
+			}
+		} else
+			ret = crypto_hash_digest(&desc, sg, 
+					PAGE_SIZE, (char *) this_checksum);
+		if (ret) {
+			printk("Digest failed. Returned %d.\n", ret);
+			return;
+		}
+		index++;
+	}
+}
+
+static struct suspend_sysfs_data sysfs_params[] = {
+	{ SUSPEND2_ATTR("enabled", SYSFS_RW),
+	  SYSFS_INT(&suspend_checksum_ops.enabled, 0, 1, 0)
+	},
+
+	{ SUSPEND2_ATTR("abort_if_resave_needed", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_ABORT_ON_RESAVE_NEEDED, 0)
+	}
+};
+
+/*
+ * Ops structure.
+ */
+static struct suspend_module_ops suspend_checksum_ops = {
+	.type			= MISC_MODULE,
+	.name			= "Checksumming",
+	.directory		= "checksum",
+	.module			= THIS_MODULE,
+	.initialise		= suspend_checksum_prepare,
+	.cleanup		= suspend_checksum_cleanup,
+	.print_debug_info	= suspend_checksum_print_debug_stats,
+	.save_config_info	= suspend_checksum_save_config_info,
+	.load_config_info	= suspend_checksum_load_config_info,
+	.storage_needed		= suspend_checksum_storage_needed,
+
+	.sysfs_data		= sysfs_params,
+	.num_sysfs_entries	= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+/* ---- Registration ---- */
+int s2_checksum_init(void)
+{
+	int result = suspend_register_module(&suspend_checksum_ops);
+
+	/* Disabled by default */
+	suspend_checksum_ops.enabled = 0;
+	return result;
+}
+
+void s2_checksum_exit(void)
+{
+	suspend_unregister_module(&suspend_checksum_ops);
+}
diff --git a/kernel/power/checksum.h b/kernel/power/checksum.h
new file mode 100644
index 0000000..9984eec
--- /dev/null
+++ b/kernel/power/checksum.h
@@ -0,0 +1,27 @@
+/*
+ * kernel/power/checksum.h
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains data checksum routines for suspend2,
+ * using cryptoapi. They are used to locate any modifications
+ * made to pageset 2 while we're saving it.
+ */
+
+#if defined(CONFIG_SUSPEND2_CHECKSUM)
+extern int s2_checksum_init(void);
+extern void s2_checksum_exit(void);
+void calculate_check_checksums(int check);
+int allocate_checksum_pages(void);
+void free_checksum_pages(void);
+#else
+static inline int s2_checksum_init(void) { return 0; }
+static inline void s2_checksum_exit(void) { }
+static inline void calculate_check_checksums(int check) { };
+static inline int allocate_checksum_pages(void) { return 0; };
+static inline void free_checksum_pages(void) { };
+#endif
+
diff --git a/kernel/power/cluster.c b/kernel/power/cluster.c
new file mode 100644
index 0000000..b5ab9ad
--- /dev/null
+++ b/kernel/power/cluster.c
@@ -0,0 +1,152 @@
+/*
+ * kernel/power/cluster.c
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains routines for cluster hibernation support.
+ *
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+
+#include "suspend.h"
+#include "modules.h"
+#include "sysfs.h"
+#include "io.h"
+
+static char suspend_cluster_master[63] = CONFIG_SUSPEND2_DEFAULT_CLUSTER_MASTER;
+
+static struct suspend_module_ops suspend_cluster_ops;
+
+/* suspend_cluster_print_debug_stats
+ *
+ * Description:	Print information to be recorded for debugging purposes into a
+ * 		buffer.
+ * Arguments:	buffer: Pointer to a buffer into which the debug info will be
+ * 			printed.
+ * 		size:	Size of the buffer.
+ * Returns:	Number of characters written to the buffer.
+ */
+static int suspend_cluster_print_debug_stats(char *buffer, int size)
+{
+	int len;
+	
+	if (strlen(suspend_cluster_master))
+		len = snprintf_used(buffer, size, "- Cluster master is '%s'.\n",
+				suspend_cluster_master);
+	else
+		len = snprintf_used(buffer, size, "- Cluster support is disabled.\n");
+	return len;
+}
+
+/* cluster_memory_needed
+ *
+ * Description:	Tell the caller how much memory we need to operate during
+ * 		suspend/resume.
+ * Returns:	Unsigned long. Maximum number of bytes of memory required for
+ * 		operation.
+ */
+static int suspend_cluster_memory_needed(void)
+{
+	return 0;
+}
+
+static int suspend_cluster_storage_needed(void)
+{
+	return 1 + strlen(suspend_cluster_master);
+}
+	
+/* suspend_cluster_save_config_info
+ *
+ * Description:	Save informaton needed when reloading the image at resume time.
+ * Arguments:	Buffer:		Pointer to a buffer of size PAGE_SIZE.
+ * Returns:	Number of bytes used for saving our data.
+ */
+static int suspend_cluster_save_config_info(char *buffer)
+{
+	strcpy(buffer, suspend_cluster_master);
+	return strlen(suspend_cluster_master + 1);
+}
+
+/* suspend_cluster_load_config_info
+ *
+ * Description:	Reload information needed for declustering the image at 
+ * 		resume time.
+ * Arguments:	Buffer:		Pointer to the start of the data.
+ *		Size:		Number of bytes that were saved.
+ */
+static void suspend_cluster_load_config_info(char *buffer, int size)
+{
+	strncpy(suspend_cluster_master, buffer, size);
+	return;
+}
+
+/*
+ * data for our sysfs entries.
+ */
+static struct suspend_sysfs_data sysfs_params[] = {
+	{
+		SUSPEND2_ATTR("master", SYSFS_RW),
+		SYSFS_STRING(suspend_cluster_master, 63, SYSFS_SM_NOT_NEEDED)
+	},
+
+	{
+		SUSPEND2_ATTR("enabled", SYSFS_RW),
+		SYSFS_INT(&suspend_cluster_ops.enabled, 0, 1)
+	}
+};
+
+/*
+ * Ops structure.
+ */
+
+static struct suspend_module_ops suspend_cluster_ops = {
+	.type			= FILTER_MODULE,
+	.name			= "Cluster",
+	.directory		= "cluster",
+	.module			= THIS_MODULE,
+	.memory_needed 		= suspend_cluster_memory_needed,
+	.print_debug_info	= suspend_cluster_print_debug_stats,
+	.save_config_info	= suspend_cluster_save_config_info,
+	.load_config_info	= suspend_cluster_load_config_info,
+	.storage_needed		= suspend_cluster_storage_needed,
+	
+	.sysfs_data		= sysfs_params,
+	.num_sysfs_entries	= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+/* ---- Registration ---- */
+
+#ifdef MODULE
+#warning Module set.
+#define INIT static __init
+#define EXIT static __exit
+#else
+#define INIT
+#define EXIT
+#endif
+
+INIT int s2_cluster_init(void)
+{
+	int temp = suspend_register_module(&suspend_cluster_ops);
+
+	if (!strlen(suspend_cluster_master))
+		suspend_cluster_ops.enabled = 0;
+	return temp;	
+}
+
+EXIT void s2_cluster_exit(void)
+{
+	suspend_unregister_module(&suspend_cluster_ops);
+}
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+module_init(s2_cluster_init);
+module_exit(s2_cluster_exit);
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Cluster Support for Suspend2");
+#endif
diff --git a/kernel/power/cluster.h b/kernel/power/cluster.h
new file mode 100644
index 0000000..d44bbf7
--- /dev/null
+++ b/kernel/power/cluster.h
@@ -0,0 +1,17 @@
+/*
+ * kernel/power/cluster.h
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net)
+ * Copyright (C) 2006 Red Hat, inc.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifdef CONFIG_SUSPEND2_CLUSTER
+extern int s2_cluster_init(void);
+extern void s2_cluster_exit(void);
+#else
+static inline int s2_cluster_init(void) { return 0; }
+static inline void s2_cluster_exit(void) { }
+#endif
+
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index aec19b0..5d014f1 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -24,6 +24,8 @@
 
 #include "power.h"
 
+#include "suspend.h"
+#include "suspend2_builtin.h"
 
 static int noresume = 0;
 char resume_file[256] = CONFIG_PM_STD_PARTITION;
@@ -118,6 +120,11 @@ int pm_suspend_disk(void)
 {
 	int error;
 
+#ifdef CONFIG_SUSPEND2
+	if (test_action_state(SUSPEND_REPLACE_SWSUSP))
+		return suspend2_try_suspend(1);
+#endif
+
 	error = prepare_processes();
 	if (error)
 		return error;
@@ -200,10 +207,22 @@ int pm_suspend_disk(void)
  *
  */
 
-static int software_resume(void)
+int software_resume(void)
 {
 	int error;
 
+	resume_attempted = 1;
+
+#ifdef CONFIG_SUSPEND2
+	/* 
+	 * We can't know (until an image header - if any - is loaded), whether
+	 * we did override swsusp. We therefore ensure that both are tried.
+	 */
+	if (test_action_state(SUSPEND_REPLACE_SWSUSP))
+		printk("Replacing swsusp.\n");
+		suspend2_try_resume();
+#endif
+
 	mutex_lock(&pm_mutex);
 	if (!swsusp_resume_device) {
 		if (!strlen(resume_file)) {
@@ -274,9 +293,6 @@ static int software_resume(void)
 	return 0;
 }
 
-late_initcall(software_resume);
-
-
 static const char * const pm_disk_modes[] = {
 	[PM_DISK_FIRMWARE]	= "firmware",
 	[PM_DISK_PLATFORM]	= "platform",
@@ -457,6 +473,7 @@ static int __init resume_offset_setup(char *str)
 static int __init noresume_setup(char *str)
 {
 	noresume = 1;
+	set_suspend_state(SUSPEND_NORESUME_SPECIFIED);
 	return 1;
 }
 
diff --git a/kernel/power/extent.c b/kernel/power/extent.c
new file mode 100644
index 0000000..cd0ff0c
--- /dev/null
+++ b/kernel/power/extent.c
@@ -0,0 +1,305 @@
+/* 
+ * kernel/power/extent.c
+ * 
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * Distributed under GPLv2.
+ * 
+ * These functions encapsulate the manipulation of storage metadata. For
+ * pageflags, we use dynamically allocated bitmaps.
+ */
+
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include "modules.h"
+#include "extent.h"
+#include "ui.h"
+#include "suspend.h"
+
+/* suspend_get_extent
+ *
+ * Returns a free extent. May fail, returning NULL instead.
+ */
+static struct extent *suspend_get_extent(void)
+{
+	struct extent *result;
+	
+	if (!(result = kmalloc(sizeof(struct extent), GFP_ATOMIC)))
+		return NULL;
+
+	result->minimum = result->maximum = 0;
+	result->next = NULL;
+
+	return result;
+}
+
+/* suspend_put_extent_chain.
+ *
+ * Frees a whole chain of extents.
+ */
+void suspend_put_extent_chain(struct extent_chain *chain)
+{
+	struct extent *this;
+
+	this = chain->first;
+
+	while(this) {
+		struct extent *next = this->next;
+		kfree(this);
+		chain->num_extents--;
+		this = next;
+	}
+	
+	chain->first = chain->last_touched = NULL;
+	chain->size = 0;
+}
+
+/* 
+ * suspend_add_to_extent_chain
+ *
+ * Add an extent to an existing chain.
+ */
+int suspend_add_to_extent_chain(struct extent_chain *chain, 
+		unsigned long minimum, unsigned long maximum)
+{
+	struct extent *new_extent = NULL, *start_at;
+
+	/* Find the right place in the chain */
+	start_at = (chain->last_touched && 
+		    (chain->last_touched->minimum < minimum)) ?
+		chain->last_touched : NULL;
+
+	if (!start_at && chain->first && chain->first->minimum < minimum)
+		start_at = chain->first;
+
+	while (start_at && start_at->next && start_at->next->minimum < minimum)
+		start_at = start_at->next;
+
+	if (start_at && start_at->maximum == (minimum - 1)) {
+		start_at->maximum = maximum;
+
+		/* Merge with the following one? */
+		if (start_at->next &&
+		    start_at->maximum + 1 == start_at->next->minimum) {
+			struct extent *to_free = start_at->next;
+			start_at->maximum = start_at->next->maximum;
+			start_at->next = start_at->next->next;
+			chain->num_extents--;
+			kfree(to_free);
+		}
+
+		chain->last_touched = start_at;
+		chain->size+= (maximum - minimum + 1);
+
+		return 0;
+	}
+
+	new_extent = suspend_get_extent();
+	if (!new_extent) {
+		printk("Error unable to append a new extent to the chain.\n");
+		return 2;
+	}
+
+	chain->num_extents++;
+	chain->size+= (maximum - minimum + 1);
+	new_extent->minimum = minimum;
+	new_extent->maximum = maximum;
+	new_extent->next = NULL;
+
+	chain->last_touched = new_extent;
+
+	if (start_at) {
+		struct extent *next = start_at->next;
+		start_at->next = new_extent;
+		new_extent->next = next;
+	} else {
+		if (chain->first)
+			new_extent->next = chain->first;
+		chain->first = new_extent;
+	}
+
+	return 0;
+}
+
+/* suspend_serialise_extent_chain
+ *
+ * Write a chain in the image.
+ */
+int suspend_serialise_extent_chain(struct suspend_module_ops *owner,
+		struct extent_chain *chain)
+{
+	struct extent *this;
+	int ret, i = 0;
+	
+	if ((ret = suspendActiveAllocator->rw_header_chunk(WRITE, owner,
+		(char *) chain,
+		2 * sizeof(int))))
+		return ret;
+
+	this = chain->first;
+	while (this) {
+		if ((ret = suspendActiveAllocator->rw_header_chunk(WRITE, owner,
+				(char *) this,
+				2 * sizeof(unsigned long))))
+			return ret;
+		this = this->next;
+		i++;
+	}
+
+	if (i != chain->num_extents) {
+		printk(KERN_EMERG "Saved %d extents but chain metadata says there "
+			"should be %d.\n", i, chain->num_extents);
+		return 1;
+	}
+
+	return ret;
+}
+
+/* suspend_load_extent_chain
+ *
+ * Read back a chain saved in the image.
+ */
+int suspend_load_extent_chain(struct extent_chain *chain)
+{
+	struct extent *this, *last = NULL;
+	int i, ret;
+
+	if ((ret = suspendActiveAllocator->rw_header_chunk(READ, NULL,
+		(char *) chain,	2 * sizeof(int)))) {
+		printk("Failed to read size of extent chain.\n");
+		return 1;
+	}
+
+	for (i = 0; i < chain->num_extents; i++) {
+		this = kmalloc(sizeof(struct extent), GFP_ATOMIC);
+		if (!this) {
+			printk("Failed to allocate a new extent.\n");
+			return -ENOMEM;
+		}
+		this->next = NULL;
+		if ((ret = suspendActiveAllocator->rw_header_chunk(READ, NULL,
+				(char *) this, 2 * sizeof(unsigned long)))) {
+			printk("Failed to an extent.\n");
+			return 1;
+		}
+		if (last)
+			last->next = this;
+		else
+			chain->first = this;
+		last = this;
+	}
+	return 0;
+}
+
+/* suspend_extent_state_next
+ *
+ * Given a state, progress to the next valid entry. We may begin in an
+ * invalid state, as we do when invoked after extent_state_goto_start below.
+ *
+ * When using compression and expected_compression > 0, we let the image size
+ * be larger than storage, so we can validly run out of data to return.
+ */
+unsigned long suspend_extent_state_next(struct extent_iterate_state *state)
+{
+	if (state->current_chain == state->num_chains)
+		return 0;
+
+	if (state->current_extent) {
+		if (state->current_offset == state->current_extent->maximum) {
+			if (state->current_extent->next) {
+				state->current_extent = state->current_extent->next;
+				state->current_offset = state->current_extent->minimum;
+			} else {
+				state->current_extent = NULL;
+				state->current_offset = 0;
+			}
+		} else
+			state->current_offset++;
+	}
+
+	while(!state->current_extent) {
+		int chain_num = ++(state->current_chain);
+
+		if (chain_num == state->num_chains)
+			return 0;
+
+		state->current_extent = (state->chains + chain_num)->first;
+
+		if (!state->current_extent)
+			continue;
+
+		state->current_offset = state->current_extent->minimum;
+	}
+
+	return state->current_offset;
+}
+
+/* suspend_extent_state_goto_start
+ *
+ * Find the first valid value in a group of chains.
+ */
+void suspend_extent_state_goto_start(struct extent_iterate_state *state)
+{
+	state->current_chain = -1;
+	state->current_extent = NULL;
+	state->current_offset = 0;
+}
+
+/* suspend_extent_start_save
+ *
+ * Given a state and a struct extent_state_store, save the current
+ * position in a format that can be used with relocated chains (at
+ * resume time).
+ */
+void suspend_extent_state_save(struct extent_iterate_state *state,
+		struct extent_iterate_saved_state *saved_state)
+{
+	struct extent *extent;
+
+	saved_state->chain_num = state->current_chain;
+	saved_state->extent_num = 0;
+	saved_state->offset = state->current_offset;
+
+	if (saved_state->chain_num == -1)
+		return;
+	
+	extent = (state->chains + state->current_chain)->first;
+
+	while (extent != state->current_extent) {
+		saved_state->extent_num++;
+		extent = extent->next;
+	}
+}
+
+/* suspend_extent_start_restore
+ *
+ * Restore the position saved by extent_state_save.
+ */
+void suspend_extent_state_restore(struct extent_iterate_state *state,
+		struct extent_iterate_saved_state *saved_state)
+{
+	int posn = saved_state->extent_num;
+
+	if (saved_state->chain_num == -1) {
+		suspend_extent_state_goto_start(state);
+		return;
+	}
+
+	state->current_chain = saved_state->chain_num;
+	state->current_extent = (state->chains + state->current_chain)->first;
+	state->current_offset = saved_state->offset;
+
+	while (posn--)
+		state->current_extent = state->current_extent->next;
+}
+
+#ifdef CONFIG_SUSPEND2_EXPORTS
+EXPORT_SYMBOL_GPL(suspend_add_to_extent_chain);
+EXPORT_SYMBOL_GPL(suspend_put_extent_chain);
+EXPORT_SYMBOL_GPL(suspend_load_extent_chain);
+EXPORT_SYMBOL_GPL(suspend_serialise_extent_chain);
+EXPORT_SYMBOL_GPL(suspend_extent_state_save);
+EXPORT_SYMBOL_GPL(suspend_extent_state_restore);
+EXPORT_SYMBOL_GPL(suspend_extent_state_goto_start);
+EXPORT_SYMBOL_GPL(suspend_extent_state_next);
+#endif
diff --git a/kernel/power/extent.h b/kernel/power/extent.h
new file mode 100644
index 0000000..c97772b
--- /dev/null
+++ b/kernel/power/extent.h
@@ -0,0 +1,77 @@
+/*
+ * kernel/power/extent.h
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains declarations related to extents. Extents are
+ * suspend's method of storing some of the metadata for the image.
+ * See extent.c for more info.
+ *
+ */
+
+#include "modules.h"
+
+#ifndef EXTENT_H
+#define EXTENT_H
+
+struct extent {
+	unsigned long minimum, maximum;
+	struct extent *next;
+};
+
+struct extent_chain {
+	int size; /* size of the chain ie sum (max-min+1) */
+	int num_extents;
+	struct extent *first, *last_touched;
+};
+
+struct extent_iterate_state {
+	struct extent_chain *chains;
+	int num_chains;
+	int current_chain;
+	struct extent *current_extent;
+	unsigned long current_offset;
+};
+
+struct extent_iterate_saved_state {
+	int chain_num;
+	int extent_num;
+	unsigned long offset;
+};
+
+#define suspend_extent_state_eof(state) ((state)->num_chains == (state)->current_chain)
+
+/* Simplify iterating through all the values in an extent chain */
+#define suspend_extent_for_each(extent_chain, extentpointer, value) \
+if ((extent_chain)->first) \
+	for ((extentpointer) = (extent_chain)->first, (value) = \
+			(extentpointer)->minimum; \
+	     ((extentpointer) && ((extentpointer)->next || (value) <= \
+				 (extentpointer)->maximum)); \
+	     (((value) == (extentpointer)->maximum) ? \
+		((extentpointer) = (extentpointer)->next, (value) = \
+		 ((extentpointer) ? (extentpointer)->minimum : 0)) : \
+			(value)++))
+
+void suspend_put_extent_chain(struct extent_chain *chain);
+int suspend_add_to_extent_chain(struct extent_chain *chain, 
+		unsigned long minimum, unsigned long maximum);
+int suspend_serialise_extent_chain(struct suspend_module_ops *owner,
+		struct extent_chain *chain);
+int suspend_load_extent_chain(struct extent_chain *chain);
+
+/* swap_entry_to_extent_val & extent_val_to_swap_entry: 
+ * We are putting offset in the low bits so consecutive swap entries
+ * make consecutive extent values */
+#define swap_entry_to_extent_val(swp_entry) (swp_entry.val)
+#define extent_val_to_swap_entry(val) (swp_entry_t) { (val) }
+
+void suspend_extent_state_save(struct extent_iterate_state *state,
+		struct extent_iterate_saved_state *saved_state);
+void suspend_extent_state_restore(struct extent_iterate_state *state,
+		struct extent_iterate_saved_state *saved_state);
+void suspend_extent_state_goto_start(struct extent_iterate_state *state);
+unsigned long suspend_extent_state_next(struct extent_iterate_state *state);
+#endif
diff --git a/kernel/power/io.c b/kernel/power/io.c
new file mode 100644
index 0000000..854d1a7
--- /dev/null
+++ b/kernel/power/io.c
@@ -0,0 +1,1407 @@
+/*
+ * kernel/power/io.c
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr>
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains high level IO routines for suspending.
+ *
+ */
+
+#include <linux/suspend.h>
+#include <linux/version.h>
+#include <linux/utsname.h>
+#include <linux/mount.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/kthread.h>
+#include <asm/tlbflush.h>
+
+#include "suspend.h"
+#include "modules.h"
+#include "pageflags.h"
+#include "io.h"
+#include "ui.h"
+#include "storage.h"
+#include "prepare_image.h"
+#include "extent.h"
+#include "sysfs.h"
+#include "suspend2_builtin.h"
+
+char poweroff_resume2[256];
+
+/* Variables shared between threads and updated under the mutex */
+static int io_write, io_finish_at, io_base, io_barmax, io_pageset, io_result;
+static int io_index, io_nextupdate, io_pc, io_pc_step;
+static unsigned long pfn, other_pfn;
+static DEFINE_MUTEX(io_mutex);
+static DEFINE_PER_CPU(struct page *, last_sought);
+static DEFINE_PER_CPU(struct page *, last_high_page);
+static DEFINE_PER_CPU(struct pbe *, last_low_page);
+static atomic_t worker_thread_count;
+static atomic_t io_count;
+
+/* suspend_attempt_to_parse_resume_device
+ *
+ * Can we suspend, using the current resume2= parameter?
+ */
+int suspend_attempt_to_parse_resume_device(int quiet)
+{
+	struct list_head *Allocator;
+	struct suspend_module_ops *thisAllocator;
+	int result, returning = 0;
+
+	if (suspend_activate_storage(0))
+		return 0;
+
+	suspendActiveAllocator = NULL;
+	clear_suspend_state(SUSPEND_RESUME_DEVICE_OK);
+	clear_suspend_state(SUSPEND_CAN_RESUME);
+	clear_result_state(SUSPEND_ABORTED);
+
+	if (!suspendNumAllocators) {
+		if (!quiet)
+			printk("Suspend2: No storage allocators have been "
+				"registered. Suspending will be disabled.\n");
+		goto cleanup;
+	}
+	
+	if (!resume2_file[0]) {
+		if (!quiet)
+			printk("Suspend2: Resume2 parameter is empty."
+				" Suspending will be disabled.\n");
+		goto cleanup;
+	}
+
+	list_for_each(Allocator, &suspendAllocators) {
+		thisAllocator = list_entry(Allocator, struct suspend_module_ops,
+								type_list);
+
+		/* 
+		 * Not sure why you'd want to disable an allocator, but
+		 * we should honour the flag if we're providing it
+		 */
+		if (!thisAllocator->enabled)
+			continue;
+
+		result = thisAllocator->parse_sig_location(
+				resume2_file, (suspendNumAllocators == 1),
+				quiet);
+
+		switch (result) {
+			case -EINVAL:
+				/* For this allocator, but not a valid 
+				 * configuration. Error already printed. */
+				goto cleanup;
+
+			case 0:
+				/* For this allocator and valid. */
+				suspendActiveAllocator = thisAllocator;
+
+				set_suspend_state(SUSPEND_RESUME_DEVICE_OK);
+				set_suspend_state(SUSPEND_CAN_RESUME);
+				if (!quiet)
+					printk("Suspend2: Resuming enabled.\n");
+
+				returning = 1;
+				goto cleanup;
+		}
+	}
+	if (!quiet)
+		printk("Suspend2: No matching enabled allocator found. "
+				"Resuming disabled.\n");
+cleanup:
+	suspend_deactivate_storage(0);
+	return returning;
+}
+
+void attempt_to_parse_resume_device2(void)
+{
+	suspend_prepare_usm();
+	suspend_attempt_to_parse_resume_device(0);
+	suspend_cleanup_usm();
+}
+
+void save_restore_resume2(int replace, int quiet)
+{
+	static char resume2_save[255];
+	static unsigned long suspend_state_save;
+
+	if (replace) {
+		suspend_state_save = suspend_state;
+		strcpy(resume2_save, resume2_file);
+		strcpy(resume2_file, poweroff_resume2);	
+	} else {
+		strcpy(resume2_file, resume2_save);
+		suspend_state = suspend_state_save;
+	}
+	suspend_attempt_to_parse_resume_device(quiet);
+}
+
+void attempt_to_parse_po_resume_device2(void)
+{
+	int ok = 0;
+
+	/* Temporarily set resume2 to the poweroff value */
+	if (!strlen(poweroff_resume2))
+		return;
+
+	printk("=== Trying Poweroff Resume2 ===\n");
+	save_restore_resume2(SAVE, NOQUIET);
+	if (test_suspend_state(SUSPEND_CAN_RESUME))
+		ok = 1;
+	
+	printk("=== Done ===\n");
+	save_restore_resume2(RESTORE, QUIET);
+	
+	/* If not ok, clear the string */
+	if (ok)
+		return;
+
+	printk("Can't resume from that location; clearing poweroff_resume2.\n");
+	poweroff_resume2[0] = '\0';
+}
+
+/* noresume_reset_modules
+ *
+ * Description:	When we read the start of an image, modules (and especially the
+ * 		active allocator) might need to reset data structures if we
+ * 		decide to invalidate the image rather than resuming from it.
+ */
+
+static void noresume_reset_modules(void)
+{
+	struct suspend_module_ops *this_filter;
+	
+	list_for_each_entry(this_filter, &suspend_filters, type_list)
+		if (this_filter->noresume_reset)
+			this_filter->noresume_reset();
+
+	if (suspendActiveAllocator && suspendActiveAllocator->noresume_reset)
+		suspendActiveAllocator->noresume_reset();
+}
+
+/* fill_suspend_header()
+ * 
+ * Description:	Fill the suspend header structure.
+ * Arguments:	struct suspend_header: Header data structure to be filled.
+ */
+
+static void fill_suspend_header(struct suspend_header *sh)
+{
+	int i;
+	
+	memset((char *)sh, 0, sizeof(*sh));
+
+	sh->version_code = LINUX_VERSION_CODE;
+	sh->num_physpages = num_physpages;
+	memcpy(&sh->uts, init_utsname(), sizeof(struct new_utsname));
+	sh->page_size = PAGE_SIZE;
+	sh->pagedir = pagedir1;
+	sh->pageset_2_size = pagedir2.size;
+	sh->param0 = suspend_result;
+	sh->param1 = suspend_action;
+	sh->param2 = suspend_debug_state;
+	sh->param3 = console_loglevel;
+	sh->root_fs = current->fs->rootmnt->mnt_sb->s_dev;
+	for (i = 0; i < 4; i++)
+		sh->io_time[i/2][i%2] = suspend_io_time[i/2][i%2];
+}
+
+/*
+ * rw_init_modules
+ *
+ * Iterate over modules, preparing the ones that will be used to read or write
+ * data.
+ */
+static int rw_init_modules(int rw, int which)
+{
+	struct suspend_module_ops *this_module;
+	/* Initialise page transformers */
+	list_for_each_entry(this_module, &suspend_filters, type_list) {
+		if (!this_module->enabled)
+			continue;
+		if (this_module->rw_init && this_module->rw_init(rw, which)) {
+			abort_suspend(SUSPEND_FAILED_MODULE_INIT,
+				"Failed to initialise the %s filter.",
+				this_module->name);
+			return 1;
+		}
+	}
+
+	/* Initialise allocator */
+	if (suspendActiveAllocator->rw_init(rw, which)) {
+		abort_suspend(SUSPEND_FAILED_MODULE_INIT,
+				"Failed to initialise the allocator."); 
+		if (!rw)
+			suspendActiveAllocator->invalidate_image();
+		return 1;
+	}
+
+	/* Initialise other modules */
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!this_module->enabled ||
+		    this_module->type == FILTER_MODULE ||
+		    this_module->type == WRITER_MODULE)
+			continue;
+		if (this_module->rw_init && this_module->rw_init(rw, which)) {
+			set_result_state(SUSPEND_ABORTED);
+			printk("Setting aborted flag due to module init failure.\n");
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * rw_cleanup_modules
+ *
+ * Cleanup components after reading or writing a set of pages.
+ * Only the allocator may fail.
+ */
+static int rw_cleanup_modules(int rw)
+{
+	struct suspend_module_ops *this_module;
+	int result = 0;
+
+	/* Cleanup other modules */
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!this_module->enabled ||
+		    this_module->type == FILTER_MODULE ||
+		    this_module->type == WRITER_MODULE)
+			continue;
+		if (this_module->rw_cleanup)
+			result |= this_module->rw_cleanup(rw);
+	}
+
+	/* Flush data and cleanup */
+	list_for_each_entry(this_module, &suspend_filters, type_list) {
+		if (!this_module->enabled)
+			continue;
+		if (this_module->rw_cleanup)
+			result |= this_module->rw_cleanup(rw);
+	}
+
+	result |= suspendActiveAllocator->rw_cleanup(rw);
+
+	return result;
+}
+
+static struct page *copy_page_from_orig_page(struct page *orig_page)
+{
+	int is_high = PageHighMem(orig_page), index, min, max;
+	struct page *high_page = NULL,
+		    **my_last_high_page = &__get_cpu_var(last_high_page),
+		    **my_last_sought = &__get_cpu_var(last_sought);
+	struct pbe *this, **my_last_low_page = &__get_cpu_var(last_low_page);
+	void *compare;
+
+	if (is_high) {
+		if (*my_last_sought && *my_last_high_page && *my_last_sought < orig_page)
+			high_page = *my_last_high_page;
+		else
+			high_page = (struct page *) restore_highmem_pblist;
+		this = (struct pbe *) kmap(high_page);
+		compare = orig_page;
+	} else {
+		if (*my_last_sought && *my_last_low_page && *my_last_sought < orig_page)
+			this = *my_last_low_page;
+		else
+			this = restore_pblist;
+		compare = page_address(orig_page);
+	}
+
+	*my_last_sought = orig_page;
+
+	/* Locate page containing pbe */
+	while ( this[PBES_PER_PAGE - 1].next &&
+		this[PBES_PER_PAGE - 1].orig_address < compare) {
+		if (is_high) {
+			struct page *next_high_page = (struct page *)
+				this[PBES_PER_PAGE - 1].next;
+			kunmap(high_page);
+			this = kmap(next_high_page);
+			high_page = next_high_page;
+		} else
+			this = this[PBES_PER_PAGE - 1].next;
+	}
+
+	/* Do a binary search within the page */
+	min = 0;
+	max = PBES_PER_PAGE;
+	index = PBES_PER_PAGE / 2;
+	while (max - min) {
+		if (!this[index].orig_address ||
+		    this[index].orig_address > compare)
+			max = index;
+		else if (this[index].orig_address == compare) {
+			if (is_high) {
+				struct page *page = this[index].address;
+				*my_last_high_page = high_page;
+				kunmap(high_page);
+				return page;
+			}
+			*my_last_low_page = this;
+			return virt_to_page(this[index].address);
+		} else
+			min = index;
+		index = ((max + min) / 2);
+	};
+
+	if (is_high)
+		kunmap(high_page);
+
+	abort_suspend(SUSPEND_FAILED_IO, "Failed to get destination page for"
+		" orig page %p. This[min].orig_address=%p.\n", orig_page,
+		this[index].orig_address);
+	return NULL;
+}
+
+/*
+ * do_rw_loop
+ *
+ * The main I/O loop for reading or writing pages.
+ */
+static int worker_rw_loop(void *data)
+{
+	unsigned long orig_pfn, write_pfn;
+	int result, my_io_index = 0;
+	struct suspend_module_ops *first_filter = suspend_get_next_filter(NULL);
+	struct page *buffer = alloc_page(GFP_ATOMIC);
+
+	atomic_inc(&worker_thread_count);
+
+	mutex_lock(&io_mutex);
+
+	do {
+		int buf_size;
+
+		/*
+		 * What page to use? If reading, don't know yet which page's
+		 * data will be read, so always use the buffer. If writing,
+		 * use the copy (Pageset1) or original page (Pageset2), but
+		 * always write the pfn of the original page.
+		 */
+		if (io_write) {
+			struct page *page;
+
+			pfn = get_next_bit_on(io_map, pfn);
+
+			/* Another thread could have beaten us to it. */
+			if (pfn == max_pfn + 1) {
+				if (atomic_read(&io_count)) {
+					printk("Ran out of pfns but io_count is still %d.\n", atomic_read(&io_count));
+					BUG();
+				}
+				break;
+			}
+
+			atomic_dec(&io_count);
+
+			orig_pfn = pfn;
+			write_pfn = pfn;
+
+			/* 
+			 * Other_pfn is updated by all threads, so we're not
+			 * writing the same page multiple times.
+			 */
+			clear_dynpageflag(&io_map, pfn_to_page(pfn));
+			if (io_pageset == 1) {
+				other_pfn = get_next_bit_on(pageset1_map, other_pfn);
+				write_pfn = other_pfn;
+			}
+			page = pfn_to_page(pfn);
+
+			my_io_index = io_finish_at - atomic_read(&io_count);
+
+			mutex_unlock(&io_mutex);
+
+			result = first_filter->write_chunk(write_pfn, page,
+					PAGE_SIZE);
+		} else {
+			atomic_dec(&io_count);
+			mutex_unlock(&io_mutex);
+
+			/* 
+			 * Are we aborting? If so, don't submit any more I/O as
+			 * resetting the resume_attempted flag (from ui.c) will
+			 * clear the bdev flags, making this thread oops.
+			 */
+			if (unlikely(test_suspend_state(SUSPEND_STOP_RESUME))) {
+				atomic_dec(&worker_thread_count);
+				if (!atomic_read(&worker_thread_count))
+					set_suspend_state(SUSPEND_IO_STOPPED);
+				while (1)
+					schedule();
+			}
+
+			result = first_filter->read_chunk(&write_pfn, buffer,
+					&buf_size, SUSPEND_ASYNC);
+			if (buf_size != PAGE_SIZE) {
+				abort_suspend(SUSPEND_FAILED_IO,
+					"I/O pipeline returned %d bytes instead "
+					"of %d.\n", buf_size, PAGE_SIZE);
+				mutex_lock(&io_mutex);
+				break;
+			}
+		}
+
+		if (result) {
+			io_result = result;
+			if (io_write) {
+				printk("Write chunk returned %d.\n", result);
+				abort_suspend(SUSPEND_FAILED_IO,
+					"Failed to write a chunk of the "
+					"image.");
+				mutex_lock(&io_mutex);
+				break;
+			}
+			panic("Read chunk returned (%d)", result);
+		}
+
+		/* 
+		 * Discard reads of resaved pages while reading ps2
+		 * and unwanted pages while rereading ps2 when aborting.
+		 */
+		if (!io_write && !PageResave(pfn_to_page(write_pfn))) {
+			struct page *final_page = pfn_to_page(write_pfn),
+				    *copy_page = final_page;
+			char *virt, *buffer_virt;
+
+			if (io_pageset == 1 && !load_direct(final_page)) {
+				copy_page = copy_page_from_orig_page(final_page);
+				BUG_ON(!copy_page);
+			}
+
+			if (test_dynpageflag(&io_map, final_page)) {
+				virt = kmap(copy_page);
+				buffer_virt = kmap(buffer);
+				memcpy(virt, buffer_virt, PAGE_SIZE);
+				kunmap(copy_page);
+				kunmap(buffer);
+				clear_dynpageflag(&io_map, final_page);
+				mutex_lock(&io_mutex);
+				my_io_index = io_finish_at - atomic_read(&io_count);
+				mutex_unlock(&io_mutex);
+			} else {
+				mutex_lock(&io_mutex);
+				atomic_inc(&io_count);
+				mutex_unlock(&io_mutex);
+			}
+		}
+
+		/* Strictly speaking, this is racy - another thread could
+		 * output the next the next percentage before we've done
+		 * ours. 1/5th of the pageset would have to be done first,
+		 * though, so I'm not worried. In addition, the only impact
+		 * would be messed up output, not image corruption. Doing
+		 * this under the mutex seems an unnecessary slowdown.
+		 */
+		if ((my_io_index + io_base) >= io_nextupdate)
+			io_nextupdate = suspend_update_status(my_io_index +
+				io_base, io_barmax, " %d/%d MB ",
+				MB(io_base+my_io_index+1), MB(io_barmax));
+
+		if ((my_io_index + 1) == io_pc) {
+			printk("%d%%...", 20 * io_pc_step);
+			io_pc_step++;
+			io_pc = io_finish_at * io_pc_step / 5;
+		}
+		
+		suspend_cond_pause(0, NULL);
+
+		/* 
+		 * Subtle: If there's less I/O still to be done than threads
+		 * running, quit. This stops us doing I/O beyond the end of
+		 * the image when reading.
+		 *
+		 * Possible race condition. Two threads could do the test at
+		 * the same time; one should exit and one should continue.
+		 * Therefore we take the mutex before comparing and exiting.
+		 */
+
+		mutex_lock(&io_mutex);
+
+	} while(atomic_read(&io_count) >= atomic_read(&worker_thread_count) &&
+		!(io_write && test_result_state(SUSPEND_ABORTED)));
+
+	atomic_dec(&worker_thread_count);
+	mutex_unlock(&io_mutex);
+
+	__free_pages(buffer, 0);
+
+	return 0;
+}
+
+void start_other_threads(void)
+{
+	int cpu;
+	struct task_struct *p;
+
+	for_each_online_cpu(cpu) {
+		if (cpu == smp_processor_id())
+			continue;
+
+		p = kthread_create(worker_rw_loop, NULL, "ks2io/%d", cpu);
+		if (IS_ERR(p)) {
+			printk("ks2io for %i failed\n", cpu);
+			continue;
+		}
+		kthread_bind(p, cpu);
+		wake_up_process(p);
+	}
+}
+
+/*
+ * do_rw_loop
+ *
+ * The main I/O loop for reading or writing pages.
+ */
+static int do_rw_loop(int write, int finish_at, dyn_pageflags_t *pageflags,
+		int base, int barmax, int pageset)
+{
+	int index = 0, cpu;
+
+	if (!finish_at)
+		return 0;
+
+	io_write = write;
+	io_finish_at = finish_at;
+	io_base = base;
+	io_barmax = barmax;
+	io_pageset = pageset;
+	io_index = 0;
+	io_pc = io_finish_at / 5;
+	io_pc_step = 1;
+	io_result = 0;
+	io_nextupdate = 0;
+
+	for_each_online_cpu(cpu) {
+		per_cpu(last_sought, cpu) = NULL;
+		per_cpu(last_low_page, cpu) = NULL;
+		per_cpu(last_high_page, cpu) = NULL;
+	}
+
+	/* Ensure all bits clear */
+	pfn = get_next_bit_on(io_map, max_pfn + 1);
+
+	while (pfn < max_pfn + 1) {
+		clear_dynpageflag(&io_map, pfn_to_page(pfn));
+		pfn = get_next_bit_on(io_map, pfn);
+	}
+
+	/* Set the bits for the pages to write */
+	pfn = get_next_bit_on(*pageflags, max_pfn + 1);
+
+	while (pfn < max_pfn + 1 && index < finish_at) {
+		set_dynpageflag(&io_map, pfn_to_page(pfn));
+		pfn = get_next_bit_on(*pageflags, pfn);
+		index++;
+	}
+
+	BUG_ON(index < finish_at);
+
+	atomic_set(&io_count, finish_at);
+
+	pfn = max_pfn + 1;
+	other_pfn = pfn;
+
+	clear_suspend_state(SUSPEND_IO_STOPPED);
+
+	if (!test_action_state(SUSPEND_NO_MULTITHREADED_IO))
+		start_other_threads();
+	worker_rw_loop(NULL);
+
+	while (atomic_read(&worker_thread_count))
+		schedule();
+
+	set_suspend_state(SUSPEND_IO_STOPPED);
+	if (unlikely(test_suspend_state(SUSPEND_STOP_RESUME))) {
+		while (1)
+			schedule();
+	}
+
+	if (!io_result) {
+		printk("done.\n");
+
+		suspend_update_status(io_base + io_finish_at, io_barmax, " %d/%d MB ",
+				MB(io_base + io_finish_at), MB(io_barmax));
+	}
+
+	if (io_write && test_result_state(SUSPEND_ABORTED))
+		io_result = 1;
+	else /* All I/O done? */
+		BUG_ON(get_next_bit_on(io_map, max_pfn + 1) != max_pfn + 1);
+
+	return io_result;
+}
+
+/* write_pageset()
+ *
+ * Description:	Write a pageset to disk.
+ * Arguments:	pagedir:	Which pagedir to write..
+ * Returns:	Zero on success or -1 on failure.
+ */
+
+int write_pageset(struct pagedir *pagedir)
+{
+	int finish_at, base = 0, start_time, end_time;
+	int barmax = pagedir1.size + pagedir2.size;
+	long error = 0;
+	dyn_pageflags_t *pageflags;
+
+	/* 
+	 * Even if there is nothing to read or write, the allocator
+	 * may need the init/cleanup for it's housekeeping.  (eg:
+	 * Pageset1 may start where pageset2 ends when writing).
+	 */
+	finish_at = pagedir->size;
+
+	if (pagedir->id == 1) {
+		suspend_prepare_status(DONT_CLEAR_BAR,
+				"Writing kernel & process data...");
+		base = pagedir2.size;
+		if (test_action_state(SUSPEND_TEST_FILTER_SPEED) ||
+		    test_action_state(SUSPEND_TEST_BIO))
+			pageflags = &pageset1_map;
+		else
+			pageflags = &pageset1_copy_map;
+	} else {
+		suspend_prepare_status(CLEAR_BAR, "Writing caches...");
+		pageflags = &pageset2_map;
+	}	
+	
+	start_time = jiffies;
+
+	if (rw_init_modules(1, pagedir->id)) {
+		abort_suspend(SUSPEND_FAILED_MODULE_INIT,
+				"Failed to initialise modules for writing.");
+		error = 1;
+	}
+
+	if (!error)
+		error = do_rw_loop(1, finish_at, pageflags, base, barmax,
+				pagedir->id);
+
+	if (rw_cleanup_modules(WRITE) && !error) {
+		abort_suspend(SUSPEND_FAILED_MODULE_CLEANUP,
+				"Failed to cleanup after writing.");
+		error = 1;
+	}
+
+	end_time = jiffies;
+	
+	if ((end_time - start_time) && (!test_result_state(SUSPEND_ABORTED))) {
+		suspend_io_time[0][0] += finish_at,
+		suspend_io_time[0][1] += (end_time - start_time);
+	}
+
+	return error;
+}
+
+/* read_pageset()
+ *
+ * Description:	Read a pageset from disk.
+ * Arguments:	whichtowrite:	Controls what debugging output is printed.
+ * 		overwrittenpagesonly: Whether to read the whole pageset or
+ * 		only part.
+ * Returns:	Zero on success or -1 on failure.
+ */
+
+static int read_pageset(struct pagedir *pagedir, int overwrittenpagesonly)
+{
+	int result = 0, base = 0, start_time, end_time;
+	int finish_at = pagedir->size;
+	int barmax = pagedir1.size + pagedir2.size;
+	dyn_pageflags_t *pageflags;
+
+	if (pagedir->id == 1) {
+		suspend_prepare_status(CLEAR_BAR,
+				"Reading kernel & process data...");
+		pageflags = &pageset1_map;
+	} else {
+		suspend_prepare_status(DONT_CLEAR_BAR, "Reading caches...");
+		if (overwrittenpagesonly)
+			barmax = finish_at = min(pagedir1.size, 
+						 pagedir2.size);
+		else {
+			base = pagedir1.size;
+		}
+		pageflags = &pageset2_map;
+	}	
+	
+	start_time = jiffies;
+
+	if (rw_init_modules(0, pagedir->id)) {
+		suspendActiveAllocator->invalidate_image();
+		result = 1;
+	} else
+		result = do_rw_loop(0, finish_at, pageflags, base, barmax,
+				pagedir->id);
+
+	if (rw_cleanup_modules(READ) && !result) {
+		abort_suspend(SUSPEND_FAILED_MODULE_CLEANUP,
+				"Failed to cleanup after reading.");
+		result = 1;
+	}
+
+	/* Statistics */
+	end_time=jiffies;
+
+	if ((end_time - start_time) && (!test_result_state(SUSPEND_ABORTED))) {
+		suspend_io_time[1][0] += finish_at,
+		suspend_io_time[1][1] += (end_time - start_time);
+	}
+
+	return result;
+}
+
+/* write_module_configs()
+ *
+ * Description:	Store the configuration for each module in the image header.
+ * Returns:	Int: Zero on success, Error value otherwise.
+ */
+static int write_module_configs(void)
+{
+	struct suspend_module_ops *this_module;
+	char *buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+	int len, index = 1;
+	struct suspend_module_header suspend_module_header;
+
+	if (!buffer) {
+		printk("Failed to allocate a buffer for saving "
+				"module configuration info.\n");
+		return -ENOMEM;
+	}
+		
+	/* 
+	 * We have to know which data goes with which module, so we at
+	 * least write a length of zero for a module. Note that we are
+	 * also assuming every module's config data takes <= PAGE_SIZE.
+	 */
+
+	/* For each module (in registration order) */
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!this_module->enabled || !this_module->storage_needed ||
+		    (this_module->type == WRITER_MODULE &&
+		     suspendActiveAllocator != this_module))
+			continue;
+
+		/* Get the data from the module */
+		len = 0;
+		if (this_module->save_config_info)
+			len = this_module->save_config_info(buffer);
+
+		/* Save the details of the module */
+		suspend_module_header.enabled = this_module->enabled;
+		suspend_module_header.type = this_module->type;
+		suspend_module_header.index = index++;
+		strncpy(suspend_module_header.name, this_module->name, 
+					sizeof(suspend_module_header.name));
+		suspendActiveAllocator->rw_header_chunk(WRITE,
+				this_module,
+				(char *) &suspend_module_header,
+				sizeof(suspend_module_header));
+
+		/* Save the size of the data and any data returned */
+		suspendActiveAllocator->rw_header_chunk(WRITE,
+				this_module,
+				(char *) &len, sizeof(int));
+		if (len)
+			suspendActiveAllocator->rw_header_chunk(
+				WRITE, this_module, buffer, len);
+	}
+
+	/* Write a blank header to terminate the list */
+	suspend_module_header.name[0] = '\0';
+	suspendActiveAllocator->rw_header_chunk(WRITE, 
+			NULL,
+			(char *) &suspend_module_header,
+			sizeof(suspend_module_header));
+
+	free_page((unsigned long) buffer);
+	return 0;
+}
+
+/* read_module_configs()
+ *
+ * Description:	Reload module configurations from the image header.
+ * Returns:	Int. Zero on success, error value otherwise.
+ */
+
+static int read_module_configs(void)
+{
+	struct suspend_module_ops *this_module;
+	char *buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+	int len, result = 0;
+	struct suspend_module_header suspend_module_header;
+
+	if (!buffer) {
+		printk("Failed to allocate a buffer for reloading module "
+				"configuration info.\n");
+		return -ENOMEM;
+	}
+		
+	/* All modules are initially disabled. That way, if we have a module
+	 * loaded now that wasn't loaded when we suspended, it won't be used
+	 * in trying to read the data.
+	 */
+	list_for_each_entry(this_module, &suspend_modules, module_list)
+		this_module->enabled = 0;
+	
+	/* Get the first module header */
+	result = suspendActiveAllocator->rw_header_chunk(READ, NULL,
+			(char *) &suspend_module_header,
+			sizeof(suspend_module_header));
+	if (result) {
+		printk("Failed to read the next module header.\n");
+		free_page((unsigned long) buffer);
+		return -EINVAL;
+	}
+
+	/* For each module (in registration order) */
+	while (suspend_module_header.name[0]) {
+
+		/* Find the module */
+		this_module = suspend_find_module_given_name(suspend_module_header.name);
+
+		if (!this_module) {
+			/* 
+			 * Is it used? Only need to worry about filters. The active
+			 * allocator must be loaded!
+			 */
+			if (suspend_module_header.enabled) {
+				suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ,
+					"It looks like we need module %s for "
+					"reading the image but it hasn't been "
+					"registered.\n",
+					suspend_module_header.name);
+				if (!(test_suspend_state(SUSPEND_CONTINUE_REQ))) {
+					suspendActiveAllocator->invalidate_image();
+					free_page((unsigned long) buffer);
+					return -EINVAL;
+				}
+			} else
+				printk("Module %s configuration data found, but"
+					" the module hasn't registered. Looks "
+					"like it was disabled, so we're "
+					"ignoring it's data.",
+					suspend_module_header.name);
+		}
+		
+		/* Get the length of the data (if any) */
+		result = suspendActiveAllocator->rw_header_chunk(READ, NULL,
+				(char *) &len, sizeof(int));
+		if (result) {
+			printk("Failed to read the length of the module %s's"
+					" configuration data.\n",
+					suspend_module_header.name);
+			free_page((unsigned long) buffer);
+			return -EINVAL;
+		}
+
+		/* Read any data and pass to the module (if we found one) */
+		if (len) {
+			suspendActiveAllocator->rw_header_chunk(READ, NULL,
+					buffer, len);
+			if (this_module) {
+				if (!this_module->save_config_info) {
+					printk("Huh? Module %s appears to have "
+						"a save_config_info, but not a "
+						"load_config_info function!\n",
+						this_module->name);
+				} else
+					this_module->load_config_info(buffer, len);
+			}
+		}
+
+		if (this_module) {
+			/* Now move this module to the tail of its lists. This
+			 * will put it in order. Any new modules will end up at
+			 * the top of the lists. They should have been set to
+			 * disabled when loaded (people will normally not edit
+			 * an initrd to load a new module and then suspend
+			 * without using it!).
+			 */
+
+			suspend_move_module_tail(this_module);
+
+			/* 
+			 * We apply the disabled state; modules don't need to
+			 * save whether they were disabled and if they do, we
+			 * override them anyway.
+			 */
+			this_module->enabled = suspend_module_header.enabled;
+		}
+
+		/* Get the next module header */
+		result = suspendActiveAllocator->rw_header_chunk(READ, NULL,
+				(char *) &suspend_module_header,
+				sizeof(suspend_module_header));
+
+		if (result) {
+			printk("Failed to read the next module header.\n");
+			free_page((unsigned long) buffer);
+			return -EINVAL;
+		}
+
+	}
+
+	free_page((unsigned long) buffer);
+	return 0;
+}
+
+/* write_image_header()
+ *
+ * Description:	Write the image header after write the image proper.
+ * Returns:	Int. Zero on success or -1 on failure.
+ */
+
+int write_image_header(void)
+{
+	int ret;
+	int total = pagedir1.size + pagedir2.size+2;
+	char *header_buffer = NULL;
+
+	/* Now prepare to write the header */
+	if ((ret = suspendActiveAllocator->write_header_init())) {
+		abort_suspend(SUSPEND_FAILED_MODULE_INIT,
+				"Active allocator's write_header_init"
+				" function failed.");
+		goto write_image_header_abort;
+	}
+
+	/* Get a buffer */
+	header_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+	if (!header_buffer) {
+		abort_suspend(SUSPEND_OUT_OF_MEMORY,
+			"Out of memory when trying to get page for header!");
+		goto write_image_header_abort;
+	}
+
+	/* Write suspend header */
+	fill_suspend_header((struct suspend_header *) header_buffer);
+	suspendActiveAllocator->rw_header_chunk(WRITE, NULL,
+			header_buffer, sizeof(struct suspend_header));
+
+	free_page((unsigned long) header_buffer);
+
+	/* Write module configurations */
+	if ((ret = write_module_configs())) {
+		abort_suspend(SUSPEND_FAILED_IO,
+				"Failed to write module configs.");
+		goto write_image_header_abort;
+	}
+
+	save_dyn_pageflags(pageset1_map);
+
+	/* Flush data and let allocator cleanup */
+	if (suspendActiveAllocator->write_header_cleanup()) {
+		abort_suspend(SUSPEND_FAILED_IO,
+				"Failed to cleanup writing header.");
+		goto write_image_header_abort_no_cleanup;
+	}
+
+	if (test_result_state(SUSPEND_ABORTED))
+		goto write_image_header_abort_no_cleanup;
+
+	suspend_message(SUSPEND_IO, SUSPEND_VERBOSE, 1, "|\n");
+	suspend_update_status(total, total, NULL);
+
+	return 0;
+
+write_image_header_abort:
+	suspendActiveAllocator->write_header_cleanup();
+write_image_header_abort_no_cleanup:
+	return -1;
+}
+
+/* sanity_check()
+ *
+ * Description:	Perform a few checks, seeking to ensure that the kernel being
+ * 		booted matches the one suspended. They need to match so we can
+ * 		be _sure_ things will work. It is not absolutely impossible for
+ * 		resuming from a different kernel to work, just not assured.
+ * Arguments:	Struct suspend_header. The header which was saved at suspend
+ * 		time.
+ */
+static char *sanity_check(struct suspend_header *sh)
+{
+	if (sh->version_code != LINUX_VERSION_CODE)
+		return "Incorrect kernel version.";
+	
+	if (sh->num_physpages != num_physpages)
+		return "Incorrect memory size.";
+
+	if (strncmp(sh->uts.sysname, init_utsname()->sysname, 65))
+		return "Incorrect system type.";
+
+	if (strncmp(sh->uts.release, init_utsname()->release, 65))
+		return "Incorrect release.";
+
+	if (strncmp(sh->uts.version, init_utsname()->version, 65))
+		return "Right kernel version but wrong build number.";
+
+	if (strncmp(sh->uts.machine, init_utsname()->machine, 65))
+		return "Incorrect machine type.";
+
+	if (sh->page_size != PAGE_SIZE)
+		return "Incorrect PAGE_SIZE.";
+
+	if (!test_action_state(SUSPEND_IGNORE_ROOTFS)) {
+		const struct super_block *sb;
+		list_for_each_entry(sb, &super_blocks, s_list) {
+			if ((!(sb->s_flags & MS_RDONLY)) &&
+			    (sb->s_type->fs_flags & FS_REQUIRES_DEV))
+				return "Device backed fs has been mounted "
+					"rw prior to resume or initrd/ramfs "
+					"is mounted rw.";
+		}
+	}
+
+	return 0;
+}
+
+/* __read_pageset1
+ *
+ * Description:	Test for the existence of an image and attempt to load it.
+ * Returns:	Int. Zero if image found and pageset1 successfully loaded.
+ * 		Error if no image found or loaded.
+ */
+static int __read_pageset1(void)
+{			
+	int i, result = 0;
+	char *header_buffer = (char *) get_zeroed_page(GFP_ATOMIC),
+	     *sanity_error = NULL;
+	struct suspend_header *suspend_header;
+
+	if (!header_buffer) {
+		printk("Unable to allocate a page for reading the signature.\n");
+		return -ENOMEM;
+	}
+	
+	/* Check for an image */
+	if (!(result = suspendActiveAllocator->image_exists())) {
+		result = -ENODATA;
+		noresume_reset_modules();
+		printk("Suspend2: No image found.\n");
+		goto out;
+	}
+
+	/* Check for noresume command line option */
+	if (test_suspend_state(SUSPEND_NORESUME_SPECIFIED)) {
+		printk("Suspend2: Noresume: Invalidated image.\n");
+		goto out_invalidate_image;
+	}
+
+	/* Check whether we've resumed before */
+	if (test_suspend_state(SUSPEND_RESUMED_BEFORE)) {
+		int resumed_before_default = 0;
+		if (test_suspend_state(SUSPEND_RETRY_RESUME))
+			resumed_before_default = SUSPEND_CONTINUE_REQ;
+
+		suspend_early_boot_message(1, resumed_before_default, NULL);
+		clear_suspend_state(SUSPEND_RETRY_RESUME);
+		if (!(test_suspend_state(SUSPEND_CONTINUE_REQ))) {
+			printk("Suspend2: Tried to resume before: "
+					"Invalidated image.\n");
+			goto out_invalidate_image;
+		}
+	}
+
+	clear_suspend_state(SUSPEND_CONTINUE_REQ);
+
+	/* 
+	 * Prepare the active allocator for reading the image header. The
+	 * activate allocator might read its own configuration.
+	 * 
+	 * NB: This call may never return because there might be a signature
+	 * for a different image such that we warn the user and they choose
+	 * to reboot. (If the device ids look erroneous (2.4 vs 2.6) or the
+	 * location of the image might be unavailable if it was stored on a
+	 * network connection.
+	 */
+
+	if ((result = suspendActiveAllocator->read_header_init())) {
+		printk("Suspend2: Failed to initialise, reading the image "
+				"header.\n");
+		goto out_invalidate_image;
+	}
+	
+	/* Read suspend header */
+	if ((result = suspendActiveAllocator->rw_header_chunk(READ, NULL,
+			header_buffer, sizeof(struct suspend_header))) < 0) {
+		printk("Suspend2: Failed to read the image signature.\n");
+		goto out_invalidate_image;
+	}
+	
+	suspend_header = (struct suspend_header *) header_buffer;
+
+	/*
+	 * NB: This call may also result in a reboot rather than returning.
+	 */
+
+	if ((sanity_error = sanity_check(suspend_header)) &&
+	    suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ, sanity_error)) {
+		printk("Suspend2: Sanity check failed.\n");
+		goto out_invalidate_image;
+	}
+
+	/*
+	 * We have an image and it looks like it will load okay.
+	 *
+	 * Get metadata from header. Don't override commandline parameters.
+	 *
+	 * We don't need to save the image size limit because it's not used
+	 * during resume and will be restored with the image anyway.
+	 */
+	
+	memcpy((char *) &pagedir1,
+		(char *) &suspend_header->pagedir, sizeof(pagedir1));
+	suspend_result = suspend_header->param0;
+	suspend_action = suspend_header->param1;
+	suspend_debug_state = suspend_header->param2;
+	console_loglevel = suspend_header->param3;
+	clear_suspend_state(SUSPEND_IGNORE_LOGLEVEL);
+	pagedir2.size = suspend_header->pageset_2_size;
+	for (i = 0; i < 4; i++)
+		suspend_io_time[i/2][i%2] =
+			suspend_header->io_time[i/2][i%2];
+
+	/* Read module configurations */
+	if ((result = read_module_configs())) {
+		pagedir1.size = pagedir2.size = 0;
+		printk("Suspend2: Failed to read Suspend module "
+				"configurations.\n");
+		clear_action_state(SUSPEND_KEEP_IMAGE);
+		goto out_invalidate_image;
+	}
+
+	suspend_prepare_console();
+
+	set_suspend_state(SUSPEND_NOW_RESUMING);
+
+	if (pre_resume_freeze())
+		goto out_reset_console;
+
+	suspend_cond_pause(1, "About to read original pageset1 locations.");
+
+	/*
+	 * Read original pageset1 locations. These are the addresses we can't
+	 * use for the data to be restored.
+	 */
+
+	if (allocate_dyn_pageflags(&pageset1_map) ||
+	    allocate_dyn_pageflags(&pageset1_copy_map) ||
+	    allocate_dyn_pageflags(&io_map))
+		goto out_reset_console;
+
+	if (load_dyn_pageflags(pageset1_map))
+		goto out_reset_console;
+
+	/* Clean up after reading the header */
+	if ((result = suspendActiveAllocator->read_header_cleanup())) {
+		printk("Suspend2: Failed to cleanup after reading the image "
+				"header.\n");
+		goto out_reset_console;
+	}
+
+	suspend_cond_pause(1, "About to read pagedir.");
+
+	/* 
+	 * Get the addresses of pages into which we will load the kernel to
+	 * be copied back
+	 */
+	if (suspend_get_pageset1_load_addresses()) {
+		printk("Suspend2: Failed to get load addresses for pageset1.\n");
+		goto out_reset_console;
+	}
+
+	/* Read the original kernel back */
+	suspend_cond_pause(1, "About to read pageset 1.");
+
+	if (read_pageset(&pagedir1, 0)) {
+		suspend_prepare_status(CLEAR_BAR, "Failed to read pageset 1.");
+		result = -EIO;
+		printk("Suspend2: Failed to get load pageset1.\n");
+		goto out_reset_console;
+	}
+
+	suspend_cond_pause(1, "About to restore original kernel.");
+	result = 0;
+
+	if (!test_action_state(SUSPEND_KEEP_IMAGE) &&
+	    suspendActiveAllocator->mark_resume_attempted)
+		suspendActiveAllocator->mark_resume_attempted(1);
+
+out:
+	free_page((unsigned long) header_buffer);
+	return result;
+
+out_reset_console:
+	suspend_cleanup_console();
+
+out_invalidate_image:
+	free_dyn_pageflags(&pageset1_map);
+	free_dyn_pageflags(&pageset1_copy_map);
+	free_dyn_pageflags(&io_map);
+	result = -EINVAL;
+	if (!test_action_state(SUSPEND_KEEP_IMAGE))
+		suspendActiveAllocator->invalidate_image();
+	suspendActiveAllocator->read_header_cleanup();
+	noresume_reset_modules();
+	goto out;
+}
+
+/* read_pageset1()
+ *
+ * Description:	Attempt to read the header and pageset1 of a suspend image.
+ * 		Handle the outcome, complaining where appropriate.
+ */
+
+int read_pageset1(void)
+{
+	int error;
+
+	error = __read_pageset1();
+
+	switch (error) {
+		case 0:
+		case -ENODATA:
+		case -EINVAL:	/* non fatal error */
+			break;
+		default:
+			if (test_result_state(SUSPEND_ABORTED))
+				break;
+
+			abort_suspend(SUSPEND_IMAGE_ERROR,
+					"Suspend2: Error %d resuming\n",
+					error);
+	}
+	return error;
+}
+
+/*
+ * get_have_image_data()
+ */
+static char *get_have_image_data(void)
+{
+	char *output_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+	struct suspend_header *suspend_header;
+
+	if (!output_buffer) {
+		printk("Output buffer null.\n");
+		return NULL;
+	}
+
+	/* Check for an image */
+	if (!suspendActiveAllocator->image_exists() ||
+	    suspendActiveAllocator->read_header_init() ||
+	    suspendActiveAllocator->rw_header_chunk(READ, NULL,
+			output_buffer, sizeof(struct suspend_header))) {
+		sprintf(output_buffer, "0\n");
+		goto out;
+	}
+
+	suspend_header = (struct suspend_header *) output_buffer;
+
+	sprintf(output_buffer, "1\n%s\n%s\n",
+			suspend_header->uts.machine,
+			suspend_header->uts.version);
+
+	/* Check whether we've resumed before */
+	if (test_suspend_state(SUSPEND_RESUMED_BEFORE))
+		strcat(output_buffer, "Resumed before.\n");
+
+out:
+	noresume_reset_modules();
+	return output_buffer;
+}
+
+/* read_pageset2()
+ *
+ * Description:	Read in part or all of pageset2 of an image, depending upon
+ * 		whether we are suspending and have only overwritten a portion
+ * 		with pageset1 pages, or are resuming and need to read them 
+ * 		all.
+ * Arguments:	Int. Boolean. Read only pages which would have been
+ * 		overwritten by pageset1?
+ * Returns:	Int. Zero if no error, otherwise the error value.
+ */
+int read_pageset2(int overwrittenpagesonly)
+{
+	int result = 0;
+
+	if (!pagedir2.size)
+		return 0;
+
+	result = read_pageset(&pagedir2, overwrittenpagesonly);
+
+	suspend_update_status(100, 100, NULL);
+	suspend_cond_pause(1, "Pagedir 2 read.");
+
+	return result;
+}
+
+/* image_exists_read
+ * 
+ * Return 0 or 1, depending on whether an image is found.
+ * Incoming buffer is PAGE_SIZE and result is guaranteed
+ * to be far less than that, so we don't worry about
+ * overflow.
+ */
+int image_exists_read(const char *page, int count)
+{
+	int len = 0;
+	char *result;
+	
+	if (suspend_activate_storage(0))
+		return count;
+
+	if (!test_suspend_state(SUSPEND_RESUME_DEVICE_OK))
+		suspend_attempt_to_parse_resume_device(0);
+
+	if (!suspendActiveAllocator) {
+		len = sprintf((char *) page, "-1\n");
+	} else {
+		result = get_have_image_data();
+		if (result) {
+			len = sprintf((char *) page, "%s",  result);
+			free_page((unsigned long) result);
+		}
+	}
+
+	suspend_deactivate_storage(0);
+
+	return len;
+}
+
+/* image_exists_write
+ * 
+ * Invalidate an image if one exists.
+ */
+int image_exists_write(const char *buffer, int count)
+{
+	if (suspend_activate_storage(0))
+		return count;
+
+	if (suspendActiveAllocator && suspendActiveAllocator->image_exists())
+		suspendActiveAllocator->invalidate_image();
+
+	suspend_deactivate_storage(0);
+
+	clear_result_state(SUSPEND_KEPT_IMAGE);
+
+	return count;
+}
+
+#ifdef CONFIG_SUSPEND2_EXPORTS
+EXPORT_SYMBOL_GPL(suspend_attempt_to_parse_resume_device);
+EXPORT_SYMBOL_GPL(attempt_to_parse_resume_device2);
+#endif
+
diff --git a/kernel/power/io.h b/kernel/power/io.h
new file mode 100644
index 0000000..527b39e
--- /dev/null
+++ b/kernel/power/io.h
@@ -0,0 +1,56 @@
+/*
+ * kernel/power/io.h
+ *
+ * Copyright (C) 2005-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains high level IO routines for suspending.
+ *
+ */
+
+#include <linux/utsname.h>
+#include "pagedir.h"
+
+/* Non-module data saved in our image header */
+struct suspend_header {
+	u32 version_code;
+	unsigned long num_physpages;
+	unsigned long orig_mem_free;
+	struct new_utsname uts;
+	int num_cpus;
+	int page_size;
+	int pageset_2_size;
+	int param0;
+	int param1;
+	int param2;
+	int param3;
+	int progress0;
+	int progress1;
+	int progress2;
+	int progress3;
+	int io_time[2][2];
+	struct pagedir pagedir;
+	dev_t root_fs;
+};
+
+extern int write_pageset(struct pagedir *pagedir);
+extern int write_image_header(void);
+extern int read_pageset1(void);
+extern int read_pageset2(int overwrittenpagesonly);
+
+extern int suspend_attempt_to_parse_resume_device(int quiet);
+extern void attempt_to_parse_resume_device2(void);
+extern void attempt_to_parse_po_resume_device2(void);
+int image_exists_read(const char *page, int count);
+int image_exists_write(const char *buffer, int count);
+extern void save_restore_resume2(int replace, int quiet);
+
+/* Args to save_restore_resume2 */
+#define RESTORE 0
+#define SAVE 1
+
+#define NOQUIET 0
+#define QUIET 1
+
+extern dev_t name_to_dev_t(char *line);
diff --git a/kernel/power/main.c b/kernel/power/main.c
index a064dfd..05b6686 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -155,7 +155,7 @@ static void suspend_finish(suspend_state_t state)
 static const char * const pm_states[PM_SUSPEND_MAX] = {
 	[PM_SUSPEND_STANDBY]	= "standby",
 	[PM_SUSPEND_MEM]	= "mem",
-#ifdef CONFIG_SOFTWARE_SUSPEND
+#if defined(CONFIG_SOFTWARE_SUSPEND) || defined(CONFIG_SUSPEND2)
 	[PM_SUSPEND_DISK]	= "disk",
 #endif
 };
diff --git a/kernel/power/modules.c b/kernel/power/modules.c
new file mode 100644
index 0000000..a6b574f
--- /dev/null
+++ b/kernel/power/modules.c
@@ -0,0 +1,415 @@
+/*
+ * kernel/power/modules.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include "suspend.h"
+#include "modules.h"
+#include "sysfs.h"
+#include "ui.h"
+
+struct list_head suspend_filters, suspendAllocators, suspend_modules;
+struct suspend_module_ops *suspendActiveAllocator;
+int suspend_num_filters;
+int suspendNumAllocators, suspend_num_modules;
+int initialised;
+       
+static inline void suspend_initialise_module_lists(void) {
+	INIT_LIST_HEAD(&suspend_filters);
+	INIT_LIST_HEAD(&suspendAllocators);
+	INIT_LIST_HEAD(&suspend_modules);
+}
+
+/*
+ * suspend_header_storage_for_modules
+ *
+ * Returns the amount of space needed to store configuration
+ * data needed by the modules prior to copying back the original
+ * kernel. We can exclude data for pageset2 because it will be
+ * available anyway once the kernel is copied back.
+ */
+int suspend_header_storage_for_modules(void)
+{
+	struct suspend_module_ops *this_module;
+	int bytes = 0;
+	
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!this_module->enabled ||
+		    (this_module->type == WRITER_MODULE &&
+		     suspendActiveAllocator != this_module))
+			continue;
+		if (this_module->storage_needed) {
+			int this = this_module->storage_needed() +
+				sizeof(struct suspend_module_header) +
+				sizeof(int);
+			this_module->header_requested = this;
+			bytes += this;
+		}
+	}
+
+	/* One more for the empty terminator */
+	return bytes + sizeof(struct suspend_module_header);
+}
+
+/*
+ * suspend_memory_for_modules
+ *
+ * Returns the amount of memory requested by modules for
+ * doing their work during the cycle.
+ */
+
+int suspend_memory_for_modules(void)
+{
+	int bytes = 0;
+	struct suspend_module_ops *this_module;
+
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!this_module->enabled)
+			continue;
+		if (this_module->memory_needed)
+			bytes += this_module->memory_needed();
+	}
+
+	return ((bytes + PAGE_SIZE - 1) >> PAGE_SHIFT);
+}
+
+/*
+ * suspend_expected_compression_ratio
+ *
+ * Returns the compression ratio expected when saving the image.
+ */
+
+int suspend_expected_compression_ratio(void)
+{
+	int ratio = 100;
+	struct suspend_module_ops *this_module;
+
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!this_module->enabled)
+			continue;
+		if (this_module->expected_compression)
+			ratio = ratio * this_module->expected_compression() / 100;
+	}
+
+	return ratio;
+}
+
+/* suspend_find_module_given_name
+ * Functionality :	Return a module (if found), given a pointer
+ * 			to its name
+ */
+
+struct suspend_module_ops *suspend_find_module_given_name(char *name)
+{
+	struct suspend_module_ops *this_module, *found_module = NULL;
+	
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!strcmp(name, this_module->name)) {
+			found_module = this_module;
+			break;
+		}			
+	}
+
+	return found_module;
+}
+
+/*
+ * suspend_print_module_debug_info
+ * Functionality   : Get debugging info from modules into a buffer.
+ */
+int suspend_print_module_debug_info(char *buffer, int buffer_size)
+{
+	struct suspend_module_ops *this_module;
+	int len = 0;
+
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!this_module->enabled)
+			continue;
+		if (this_module->print_debug_info) {
+			int result;
+			result = this_module->print_debug_info(buffer + len, 
+					buffer_size - len);
+			len += result;
+		}
+	}
+
+	/* Ensure null terminated */
+	buffer[buffer_size] = 0;
+
+	return len;
+}
+
+/*
+ * suspend_register_module
+ *
+ * Register a module.
+ */
+int suspend_register_module(struct suspend_module_ops *module)
+{
+	int i;
+	struct kobject *kobj;
+
+	if (!initialised) {
+		suspend_initialise_module_lists();
+		initialised = 1;
+	}
+
+	module->enabled = 1;
+	
+	if (suspend_find_module_given_name(module->name)) {
+		printk("Suspend2: Trying to load module %s,"
+				" which is already registered.\n",
+				module->name);
+		return -EBUSY;
+	}
+
+	switch (module->type) {
+		case FILTER_MODULE:
+			list_add_tail(&module->type_list,
+					&suspend_filters);
+			suspend_num_filters++;
+			break;
+
+		case WRITER_MODULE:
+			list_add_tail(&module->type_list,
+					&suspendAllocators);
+			suspendNumAllocators++;
+			break;
+
+		case MISC_MODULE:
+			break;
+
+		default:
+			printk("Hmmm. Module '%s' has an invalid type."
+				" It has been ignored.\n", module->name);
+			return -EINVAL;
+	}
+	list_add_tail(&module->module_list, &suspend_modules);
+	suspend_num_modules++;
+
+	if (module->directory || module->shared_directory) {
+		/* 
+		 * Modules may share a directory, but those with shared_dir
+		 * set must be loaded (via symbol dependencies) after parents
+		 * and unloaded beforehand.
+		 */
+		if (module->shared_directory) {
+			struct suspend_module_ops *shared =
+				suspend_find_module_given_name(module->shared_directory);
+			if (!shared) {
+				printk("Suspend2: Module %s wants to share %s's directory but %s isn't loaded.\n",
+						module->name,
+						module->shared_directory,
+						module->shared_directory);
+				suspend_unregister_module(module);
+				return -ENODEV;
+			}
+			kobj = shared->dir_kobj;
+		} else
+			kobj = make_suspend2_sysdir(module->directory);
+		module->dir_kobj = kobj;
+		for (i=0; i < module->num_sysfs_entries; i++) {
+			int result = suspend_register_sysfs_file(kobj, &module->sysfs_data[i]);
+			if (result)
+				return result;
+		}
+	}
+
+	printk("Suspend2 %s support registered.\n", module->name);
+	return 0;
+}
+
+/*
+ * suspend_unregister_module
+ *
+ * Remove a module.
+ */
+void suspend_unregister_module(struct suspend_module_ops *module)
+{
+	int i;
+
+	if (module->dir_kobj)
+		for (i=0; i < module->num_sysfs_entries; i++)
+			suspend_unregister_sysfs_file(module->dir_kobj, &module->sysfs_data[i]);
+
+	if (!module->shared_directory && module->directory)
+		remove_suspend2_sysdir(module->dir_kobj);
+
+	switch (module->type) {
+		case FILTER_MODULE:
+			list_del(&module->type_list);
+			suspend_num_filters--;
+			break;
+
+		case WRITER_MODULE:
+			list_del(&module->type_list);
+			suspendNumAllocators--;
+			if (suspendActiveAllocator == module) {
+				suspendActiveAllocator = NULL;
+				clear_suspend_state(SUSPEND_CAN_RESUME);
+				clear_suspend_state(SUSPEND_CAN_SUSPEND);
+			}
+			break;
+		
+		case MISC_MODULE:
+			break;
+
+		default:
+			printk("Hmmm. Module '%s' has an invalid type."
+				" It has been ignored.\n", module->name);
+			return;
+	}
+	list_del(&module->module_list);
+	suspend_num_modules--;
+	printk("Suspend2 %s module unloaded.\n", module->name);
+}
+
+/*
+ * suspend_move_module_tail
+ *
+ * Rearrange modules when reloading the config.
+ */
+void suspend_move_module_tail(struct suspend_module_ops *module)
+{
+	switch (module->type) {
+		case FILTER_MODULE:
+			if (suspend_num_filters > 1)
+				list_move_tail(&module->type_list,
+						&suspend_filters);
+			break;
+
+		case WRITER_MODULE:
+			if (suspendNumAllocators > 1)
+				list_move_tail(&module->type_list,
+						&suspendAllocators);
+			break;
+		
+		case MISC_MODULE:
+			break;
+		default:
+			printk("Hmmm. Module '%s' has an invalid type."
+				" It has been ignored.\n", module->name);
+			return;
+	}
+	if ((suspend_num_filters + suspendNumAllocators) > 1)
+		list_move_tail(&module->module_list, &suspend_modules);
+}
+
+/*
+ * suspend_initialise_modules
+ *
+ * Get ready to do some work!
+ */
+int suspend_initialise_modules(int starting_cycle)
+{
+	struct suspend_module_ops *this_module;
+	int result;
+	
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		this_module->header_requested = 0;
+		this_module->header_used = 0;
+		if (!this_module->enabled)
+			continue;
+		if (this_module->initialise) {
+			suspend_message(SUSPEND_MEMORY, SUSPEND_MEDIUM, 1,
+				"Initialising module %s.\n",
+				this_module->name);
+			if ((result = this_module->initialise(starting_cycle))) {
+				printk("%s didn't initialise okay.\n",
+						this_module->name);
+				return result;
+			}
+		}
+	}
+
+	return 0;
+}
+
+/* 
+ * suspend_cleanup_modules
+ *
+ * Tell modules the work is done.
+ */
+void suspend_cleanup_modules(int finishing_cycle)
+{
+	struct suspend_module_ops *this_module;
+	
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!this_module->enabled)
+			continue;
+		if (this_module->cleanup) {
+			suspend_message(SUSPEND_MEMORY, SUSPEND_MEDIUM, 1,
+				"Cleaning up module %s.\n",
+				this_module->name);
+			this_module->cleanup(finishing_cycle);
+		}
+	}
+}
+
+/*
+ * suspend_get_next_filter
+ *
+ * Get the next filter in the pipeline.
+ */
+struct suspend_module_ops *suspend_get_next_filter(struct suspend_module_ops *filter_sought)
+{
+	struct suspend_module_ops *last_filter = NULL, *this_filter = NULL;
+
+	list_for_each_entry(this_filter, &suspend_filters, type_list) {
+		if (!this_filter->enabled)
+			continue;
+		if ((last_filter == filter_sought) || (!filter_sought))
+			return this_filter;
+		last_filter = this_filter;
+	}
+
+	return suspendActiveAllocator;
+}
+
+/* suspend_get_modules
+ * 
+ * Take a reference to modules so they can't go away under us.
+ */
+
+int suspend_get_modules(void)
+{
+	struct suspend_module_ops *this_module;
+	
+	list_for_each_entry(this_module, &suspend_modules, module_list) {
+		if (!try_module_get(this_module->module)) {
+			/* Failed! Reverse gets and return error */
+			struct suspend_module_ops *this_module2;
+			list_for_each_entry(this_module2, &suspend_modules, module_list) {
+				if (this_module == this_module2)
+					return -EINVAL;
+				module_put(this_module2->module);
+			}
+		}
+	}
+
+	return 0;
+}
+
+/* suspend_put_modules
+ *
+ * Release our references to modules we used.
+ */
+
+void suspend_put_modules(void)
+{
+	struct suspend_module_ops *this_module;
+	
+	list_for_each_entry(this_module, &suspend_modules, module_list)
+		module_put(this_module->module);
+}
+
+#ifdef CONFIG_SUSPEND2_EXPORTS
+EXPORT_SYMBOL_GPL(suspend_register_module);
+EXPORT_SYMBOL_GPL(suspend_unregister_module);
+EXPORT_SYMBOL_GPL(suspend_get_next_filter);
+EXPORT_SYMBOL_GPL(suspendActiveAllocator);
+#endif
diff --git a/kernel/power/modules.h b/kernel/power/modules.h
new file mode 100644
index 0000000..ed94458
--- /dev/null
+++ b/kernel/power/modules.h
@@ -0,0 +1,164 @@
+/*
+ * kernel/power/modules.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains declarations for modules. Modules are additions to
+ * suspend2 that provide facilities such as image compression or
+ * encryption, backends for storage of the image and user interfaces.
+ *
+ */
+
+#ifndef SUSPEND_MODULES_H
+#define SUSPEND_MODULES_H
+
+/* This is the maximum size we store in the image header for a module name */
+#define SUSPEND_MAX_MODULE_NAME_LENGTH 30
+
+/* Per-module metadata */
+struct suspend_module_header {
+	char name[SUSPEND_MAX_MODULE_NAME_LENGTH];
+	int enabled;
+	int type;
+	int index;
+	int data_length;
+	unsigned long signature;
+};
+
+enum {
+	FILTER_MODULE,
+	WRITER_MODULE,
+	MISC_MODULE /* Block writer, eg. */
+};
+
+enum {
+	SUSPEND_ASYNC,
+	SUSPEND_SYNC
+};
+
+struct suspend_module_ops {
+	/* Functions common to all modules */
+	int type;
+	char *name;
+	char *directory;
+	char *shared_directory;
+	struct kobject *dir_kobj;
+	struct module *module;
+	int enabled;
+	struct list_head module_list;
+
+	/* List of filters or allocators */
+	struct list_head list, type_list;
+
+	/*
+	 * Requirements for memory and storage in
+	 * the image header..
+	 */
+	int (*memory_needed) (void);
+	int (*storage_needed) (void);
+
+	int header_requested, header_used;
+
+	int (*expected_compression) (void);
+	
+	/* 
+	 * Debug info
+	 */
+	int (*print_debug_info) (char *buffer, int size);
+	int (*save_config_info) (char *buffer);
+	void (*load_config_info) (char *buffer, int len);
+
+	/* 
+	 * Initialise & cleanup - general routines called
+	 * at the start and end of a cycle.
+	 */
+	int (*initialise) (int starting_cycle);
+	void (*cleanup) (int finishing_cycle);
+
+	/* 
+	 * Calls for allocating storage (allocators only).
+	 *
+	 * Header space is allocated separately. Note that allocation
+	 * of space for the header might result in allocated space 
+	 * being stolen from the main pool if there is no unallocated
+	 * space. We have to be able to allocate enough space for
+	 * the header. We can eat memory to ensure there is enough
+	 * for the main pool.
+	 */
+
+	int (*storage_available) (void);
+	int (*allocate_header_space) (int space_requested);
+	int (*allocate_storage) (int space_requested);
+	int (*storage_allocated) (void);
+	int (*release_storage) (void);
+	
+	/*
+	 * Routines used in image I/O.
+	 */
+	int (*rw_init) (int rw, int stream_number);
+	int (*rw_cleanup) (int rw);
+	int (*write_chunk) (unsigned long index, struct page *buffer_page,
+			unsigned int buf_size);
+	int (*read_chunk) (unsigned long *index, struct page *buffer_page,
+			unsigned int *buf_size, int sync);
+
+	/* Reset module if image exists but reading aborted */
+	void (*noresume_reset) (void);
+
+	/* Read and write the metadata */	
+	int (*write_header_init) (void);
+	int (*write_header_cleanup) (void);
+
+	int (*read_header_init) (void);
+	int (*read_header_cleanup) (void);
+
+	int (*rw_header_chunk) (int rw, struct suspend_module_ops *owner,
+			char *buffer_start, int buffer_size);
+	
+	/* Attempt to parse an image location */
+	int (*parse_sig_location) (char *buffer, int only_writer, int quiet);
+
+	/* Determine whether image exists that we can restore */
+	int (*image_exists) (void);
+	
+	/* Mark the image as having tried to resume */
+	void (*mark_resume_attempted) (int);
+
+	/* Destroy image if one exists */
+	int (*invalidate_image) (void);
+	
+	/* Sysfs Data */
+	struct suspend_sysfs_data *sysfs_data;
+	int num_sysfs_entries;
+};
+
+extern int suspend_num_modules, suspendNumAllocators;
+
+extern struct suspend_module_ops *suspendActiveAllocator;
+extern struct list_head suspend_filters, suspendAllocators, suspend_modules;
+
+extern void suspend_prepare_console_modules(void);
+extern void suspend_cleanup_console_modules(void);
+
+extern struct suspend_module_ops *suspend_find_module_given_name(char *name);
+extern struct suspend_module_ops *suspend_get_next_filter(struct suspend_module_ops *);
+
+extern int suspend_register_module(struct suspend_module_ops *module);
+extern void suspend_move_module_tail(struct suspend_module_ops *module);
+
+extern int suspend_header_storage_for_modules(void);
+extern int suspend_memory_for_modules(void);
+extern int suspend_expected_compression_ratio(void);
+
+extern int suspend_print_module_debug_info(char *buffer, int buffer_size);
+extern int suspend_register_module(struct suspend_module_ops *module);
+extern void suspend_unregister_module(struct suspend_module_ops *module);
+
+extern int suspend_initialise_modules(int starting_cycle);
+extern void suspend_cleanup_modules(int finishing_cycle);
+
+int suspend_get_modules(void);
+void suspend_put_modules(void);
+#endif
diff --git a/kernel/power/netlink.c b/kernel/power/netlink.c
new file mode 100644
index 0000000..bb1d563
--- /dev/null
+++ b/kernel/power/netlink.c
@@ -0,0 +1,387 @@
+/*
+ * kernel/power/netlink.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Functions for communicating with a userspace helper via netlink.
+ */
+
+
+#include <linux/suspend.h>
+#include "netlink.h"
+#include "suspend.h"
+#include "modules.h"
+
+struct user_helper_data *uhd_list = NULL;
+
+/* 
+ * Refill our pool of SKBs for use in emergencies (eg, when eating memory and none
+ * can be allocated).
+ */
+static void suspend_fill_skb_pool(struct user_helper_data *uhd)
+{
+	while (uhd->pool_level < uhd->pool_limit) {
+		struct sk_buff *new_skb =
+			alloc_skb(NLMSG_SPACE(uhd->skb_size), GFP_ATOMIC);
+
+		if (!new_skb)
+			break;
+
+		new_skb->next = uhd->emerg_skbs;
+		uhd->emerg_skbs = new_skb;
+		uhd->pool_level++;
+	}
+}
+
+/* 
+ * Try to allocate a single skb. If we can't get one, try to use one from
+ * our pool.
+ */
+static struct sk_buff *suspend_get_skb(struct user_helper_data *uhd)
+{
+	struct sk_buff *skb =
+		alloc_skb(NLMSG_SPACE(uhd->skb_size), GFP_ATOMIC);
+
+	if (skb)
+		return skb;
+
+	skb = uhd->emerg_skbs;
+	if (skb) {
+		uhd->pool_level--;
+		uhd->emerg_skbs = skb->next;
+		skb->next = NULL;
+	}
+
+	return skb;
+}
+
+static void put_skb(struct user_helper_data *uhd, struct sk_buff *skb)
+{
+	if (uhd->pool_level < uhd->pool_limit) {
+		skb->next = uhd->emerg_skbs;
+		uhd->emerg_skbs = skb;
+	} else
+		kfree_skb(skb);
+}
+
+void suspend_send_netlink_message(struct user_helper_data *uhd,
+		int type, void* params, size_t len)
+{
+	struct sk_buff *skb;
+	struct nlmsghdr *nlh;
+	void *dest;
+	struct task_struct *t;
+
+	if (uhd->pid == -1)
+		return;
+
+	skb = suspend_get_skb(uhd);
+	if (!skb) {
+		printk("suspend_netlink: Can't allocate skb!\n");
+		return;
+	}
+
+	/* NLMSG_PUT contains a hidden goto nlmsg_failure */
+	nlh = NLMSG_PUT(skb, 0, uhd->sock_seq, type, len);
+	uhd->sock_seq++;
+
+	dest = NLMSG_DATA(nlh);
+	if (params && len > 0)
+		memcpy(dest, params, len);
+
+	netlink_unicast(uhd->nl, skb, uhd->pid, 0);
+
+	read_lock(&tasklist_lock);
+	if ((t = find_task_by_pid(uhd->pid)) == NULL) {
+		read_unlock(&tasklist_lock);
+		if (uhd->pid > -1)
+			printk("Hmm. Can't find the userspace task %d.\n", uhd->pid);
+		return;
+	}
+	wake_up_process(t);
+	read_unlock(&tasklist_lock);
+
+	yield();
+
+	return;
+
+nlmsg_failure:
+	if (skb)
+		put_skb(uhd, skb);
+}
+
+static void send_whether_debugging(struct user_helper_data *uhd)
+{
+	static int is_debugging = 1;
+
+	suspend_send_netlink_message(uhd, NETLINK_MSG_IS_DEBUGGING,
+			&is_debugging, sizeof(int));
+}
+
+/*
+ * Set the PF_NOFREEZE flag on the given process to ensure it can run whilst we
+ * are suspending.
+ */
+static int nl_set_nofreeze(struct user_helper_data *uhd, int pid)
+{
+	struct task_struct *t;
+
+	read_lock(&tasklist_lock);
+	if ((t = find_task_by_pid(pid)) == NULL) {
+		read_unlock(&tasklist_lock);
+		printk("Strange. Can't find the userspace task %d.\n", pid);
+		return -EINVAL;
+	}
+
+	t->flags |= PF_NOFREEZE;
+
+	read_unlock(&tasklist_lock);
+	uhd->pid = pid;
+
+	suspend_send_netlink_message(uhd, NETLINK_MSG_NOFREEZE_ACK, NULL, 0);
+
+	return 0;
+}
+
+/*
+ * Called when the userspace process has informed us that it's ready to roll.
+ */
+static int nl_ready(struct user_helper_data *uhd, int version)
+{
+	if (version != uhd->interface_version) {
+		printk("%s userspace process using invalid interface version."
+				" Trying to continue without it.\n",
+				uhd->name);
+		if (uhd->not_ready)
+			uhd->not_ready();
+		return 1;
+	}
+
+	complete(&uhd->wait_for_process);
+
+	return 0;
+}
+
+void suspend_netlink_close_complete(struct user_helper_data *uhd)
+{
+	if (uhd->nl) {
+		sock_release(uhd->nl->sk_socket);
+		uhd->nl = NULL;
+	}
+
+	while (uhd->emerg_skbs) {
+		struct sk_buff *next = uhd->emerg_skbs->next;
+		kfree_skb(uhd->emerg_skbs);
+		uhd->emerg_skbs = next;
+	}
+
+	uhd->pid = -1;
+
+	suspend_put_modules();
+}
+
+static int suspend_nl_gen_rcv_msg(struct user_helper_data *uhd,
+		struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	int type;
+	int *data;
+	int err;
+
+	/* Let the more specific handler go first. It returns
+	 * 1 for valid messages that it doesn't know. */
+	if ((err = uhd->rcv_msg(skb, nlh)) != 1)
+		return err;
+	
+	type = nlh->nlmsg_type;
+
+	/* Only allow one task to receive NOFREEZE privileges */
+	if (type == NETLINK_MSG_NOFREEZE_ME && uhd->pid != -1) {
+		printk("Received extra nofreeze me requests.\n");
+		return -EBUSY;
+	}
+
+	data = (int*)NLMSG_DATA(nlh);
+
+	switch (type) {
+		case NETLINK_MSG_NOFREEZE_ME:
+			if ((err = nl_set_nofreeze(uhd, nlh->nlmsg_pid)) != 0)
+				return err;
+			break;
+		case NETLINK_MSG_GET_DEBUGGING:
+			send_whether_debugging(uhd);
+			break;
+		case NETLINK_MSG_READY:
+			if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
+				printk("Invalid ready mesage.\n");
+				return -EINVAL;
+			}
+			if ((err = nl_ready(uhd, *data)) != 0)
+				return err;
+			break;
+		case NETLINK_MSG_CLEANUP:
+			suspend_netlink_close_complete(uhd);
+			break;
+	}
+
+	return 0;
+}
+
+static void suspend_user_rcv_skb(struct user_helper_data *uhd,
+				  struct sk_buff *skb)
+{
+	int err;
+	struct nlmsghdr *nlh;
+
+	while (skb->len >= NLMSG_SPACE(0)) {
+		u32 rlen;
+
+		nlh = (struct nlmsghdr *) skb->data;
+		if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
+			return;
+
+		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+		if (rlen > skb->len)
+			rlen = skb->len;
+
+		if ((err = suspend_nl_gen_rcv_msg(uhd, skb, nlh)) != 0)
+			netlink_ack(skb, nlh, err);
+		else if (nlh->nlmsg_flags & NLM_F_ACK)
+			netlink_ack(skb, nlh, 0);
+		skb_pull(skb, rlen);
+	}
+}
+
+static void suspend_netlink_input(struct sock *sk, int len)
+{
+	struct user_helper_data *uhd = uhd_list;
+
+	while (uhd && uhd->netlink_id != sk->sk_protocol)
+		uhd= uhd->next;
+
+	do {
+		struct sk_buff *skb;
+		while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+			suspend_user_rcv_skb(uhd, skb);
+			put_skb(uhd, skb);
+		}
+	} while (uhd->nl && uhd->nl->sk_receive_queue.qlen);
+}
+
+static int netlink_prepare(struct user_helper_data *uhd)
+{
+	suspend_get_modules();
+
+	uhd->next = uhd_list;
+	uhd_list = uhd;
+
+	uhd->sock_seq = 0x42c0ffee;
+	uhd->nl = netlink_kernel_create(uhd->netlink_id, 0,
+			suspend_netlink_input, THIS_MODULE);
+	if (!uhd->nl) {
+		printk("Failed to allocate netlink socket for %s.\n",
+				uhd->name);
+		return -ENOMEM;
+	}
+
+	suspend_fill_skb_pool(uhd);
+
+	return 0;
+}
+
+void suspend_netlink_close(struct user_helper_data *uhd)
+{
+	struct task_struct *t;
+
+	read_lock(&tasklist_lock);
+	if ((t = find_task_by_pid(uhd->pid)))
+		t->flags &= ~PF_NOFREEZE;
+	read_unlock(&tasklist_lock);
+
+	suspend_send_netlink_message(uhd, NETLINK_MSG_CLEANUP, NULL, 0);
+}
+
+static int suspend2_launch_userspace_program(char *command, int channel_no)
+{
+	int retval;
+	static char *envp[] = {
+			"HOME=/",
+			"TERM=linux",
+			"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+			NULL };
+	static char *argv[] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
+	char *channel = kmalloc(6, GFP_KERNEL);
+	int arg = 0, size;
+	char test_read[255];
+	char *orig_posn = command;
+
+	if (!strlen(orig_posn))
+		return 1;
+
+	/* Up to 7 args supported */
+	while (arg < 7) {
+		sscanf(orig_posn, "%s", test_read);
+		size = strlen(test_read);
+		if (!(size))
+			break;
+		argv[arg] = kmalloc(size + 1, GFP_ATOMIC);
+		strcpy(argv[arg], test_read);
+		orig_posn += size + 1;
+		*test_read = 0;
+		arg++;
+	}
+	
+	if (channel_no) {
+		sprintf(channel, "-c%d", channel_no);
+		argv[arg] = channel;
+	} else
+		arg--;
+
+	retval = call_usermodehelper(argv[0], argv, envp, 0);
+
+	if (retval)
+		printk("Failed to launch userspace program '%s': Error %d\n",
+				command, retval);
+
+	{
+		int i;
+		for (i = 0; i < arg; i++)
+			if (argv[i] && argv[i] != channel)
+				kfree(argv[i]);
+	}
+
+	kfree(channel);
+
+	return retval;
+}
+
+int suspend_netlink_setup(struct user_helper_data *uhd)
+{
+	if (netlink_prepare(uhd) < 0) {
+		printk("Netlink prepare failed.\n");
+		return 1;
+	}
+
+	if (suspend2_launch_userspace_program(uhd->program, uhd->netlink_id) < 0) {
+		printk("Launch userspace program failed.\n");
+		suspend_netlink_close_complete(uhd);
+		return 1;
+	}
+
+	/* Wait 2 seconds for the userspace process to make contact */
+	wait_for_completion_timeout(&uhd->wait_for_process, 2*HZ);
+
+	if (uhd->pid == -1) {
+		printk("%s: Failed to contact userspace process.\n",
+				uhd->name);
+		suspend_netlink_close_complete(uhd);
+		return 1;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(suspend_netlink_setup);
+EXPORT_SYMBOL_GPL(suspend_netlink_close);
+EXPORT_SYMBOL_GPL(suspend_send_netlink_message);
diff --git a/kernel/power/netlink.h b/kernel/power/netlink.h
new file mode 100644
index 0000000..97647e8
--- /dev/null
+++ b/kernel/power/netlink.h
@@ -0,0 +1,58 @@
+/*
+ * kernel/power/netlink.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Declarations for functions for communicating with a userspace helper
+ * via netlink.
+ */
+
+#include <linux/netlink.h>
+#include <net/sock.h>
+
+#define NETLINK_MSG_BASE 0x10
+
+#define NETLINK_MSG_READY 0x10
+#define	NETLINK_MSG_NOFREEZE_ME 0x16
+#define NETLINK_MSG_GET_DEBUGGING 0x19
+#define NETLINK_MSG_CLEANUP 0x24
+#define NETLINK_MSG_NOFREEZE_ACK 0x27
+#define NETLINK_MSG_IS_DEBUGGING 0x28
+
+struct user_helper_data {
+	int (*rcv_msg) (struct sk_buff *skb, struct nlmsghdr *nlh);
+	void (* not_ready) (void);
+	struct sock *nl;
+	u32 sock_seq;
+	pid_t pid;
+	char *comm;
+	char program[256];
+	int pool_level;
+	int pool_limit;
+	struct sk_buff *emerg_skbs;
+	int skb_size;
+	int netlink_id;	
+	char *name;
+	struct user_helper_data *next;
+	struct completion wait_for_process;
+	int interface_version;
+	int must_init;
+};
+
+#ifdef CONFIG_NET
+int suspend_netlink_setup(struct user_helper_data *uhd);
+void suspend_netlink_close(struct user_helper_data *uhd);
+void suspend_send_netlink_message(struct user_helper_data *uhd,
+		int type, void* params, size_t len);
+#else
+static inline int suspend_netlink_setup(struct user_helper_data *uhd)
+{
+	return 0;
+}
+
+static inline void suspend_netlink_close(struct user_helper_data *uhd) { };
+static inline void suspend_send_netlink_message(struct user_helper_data *uhd,
+		int type, void* params, size_t len) { };
+#endif
diff --git a/kernel/power/pagedir.c b/kernel/power/pagedir.c
new file mode 100644
index 0000000..4e74689
--- /dev/null
+++ b/kernel/power/pagedir.c
@@ -0,0 +1,480 @@
+/*
+ * kernel/power/pagedir.c
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr>
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for handling pagesets.
+ * Note that pbes aren't actually stored as such. They're stored as
+ * bitmaps and extents.
+ */
+
+#include <linux/suspend.h>
+#include <linux/highmem.h>
+#include <linux/bootmem.h>
+#include <linux/hardirq.h>
+#include <linux/sched.h>
+#include <asm/tlbflush.h>
+
+#include "pageflags.h"
+#include "ui.h"
+#include "pagedir.h"
+#include "prepare_image.h"
+#include "suspend.h"
+#include "power.h"
+#include "suspend2_builtin.h"
+
+#define PAGESET1 0
+#define PAGESET2 1
+
+static int ps2_pfn;
+
+/*
+ * suspend_mark_task_as_pageset
+ * Functionality   : Marks all the saveable pages belonging to a given process
+ * 		     as belonging to a particular pageset.
+ */
+
+static void suspend_mark_task_as_pageset(struct task_struct *t, int pageset2)
+{
+	struct vm_area_struct *vma;
+	struct mm_struct *mm;
+
+	mm = t->active_mm;
+
+	if (!mm || !mm->mmap) return;
+
+	if (!irqs_disabled())
+		down_read(&mm->mmap_sem);
+	
+	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+		unsigned long posn;
+
+		if (vma->vm_flags & (VM_PFNMAP | VM_IO | VM_RESERVED)) {
+			printk("Skipping vma %p in process %d (%s) which has "
+				"VM_PFNMAP | VM_IO | VM_RESERVED (%lx).\n", vma,
+				t->pid, t->comm, vma->vm_flags);
+			continue;
+		}
+
+		if (!vma->vm_start)
+			continue;
+
+		for (posn = vma->vm_start; posn < vma->vm_end;
+				posn += PAGE_SIZE) {
+			struct page *page = follow_page(vma, posn, 0);
+			if (!page)
+				continue;
+
+			if (pageset2)
+				SetPagePageset2(page);
+			else {
+				ClearPagePageset2(page);
+				SetPagePageset1(page);
+			}
+		}
+	}
+
+	if (!irqs_disabled())
+		up_read(&mm->mmap_sem);
+}
+
+static void pageset2_full(void)
+{
+	struct zone *zone;
+	unsigned long flags;
+
+	for_each_zone(zone) {
+		spin_lock_irqsave(&zone->lru_lock, flags);
+		if (zone_page_state(zone, NR_INACTIVE)) {
+			struct page *page;
+			list_for_each_entry(page, &zone->inactive_list, lru)
+				SetPagePageset2(page);
+		}
+		if (zone_page_state(zone, NR_ACTIVE)) {
+			struct page *page;
+			list_for_each_entry(page, &zone->active_list, lru)
+				SetPagePageset2(page);
+		}
+		spin_unlock_irqrestore(&zone->lru_lock, flags);
+	}
+}
+
+/* mark_pages_for_pageset2
+ *
+ * Description:	Mark unshared pages in processes not needed for suspend as
+ * 		being able to be written out in a separate pagedir.
+ * 		HighMem pages are simply marked as pageset2. They won't be
+ * 		needed during suspend.
+ */
+
+struct attention_list {
+	struct task_struct *task;
+	struct attention_list *next;
+};
+
+void suspend_mark_pages_for_pageset2(void)
+{
+	struct task_struct *p;
+	struct attention_list *attention_list = NULL, *last = NULL, *next;
+	int i, task_count = 0;
+
+	if (test_action_state(SUSPEND_NO_PAGESET2))
+		return;
+
+	clear_dyn_pageflags(pageset2_map);
+	
+	if (test_action_state(SUSPEND_PAGESET2_FULL))
+		pageset2_full();
+	else {
+		read_lock(&tasklist_lock);
+		for_each_process(p) {
+			if (!p->mm || (p->flags & PF_BORROWED_MM))
+				continue;
+
+			suspend_mark_task_as_pageset(p, PAGESET2);
+		}
+		read_unlock(&tasklist_lock);
+	}
+
+	/* 
+	 * Now we count all userspace process (with task->mm) marked PF_NOFREEZE.
+	 */
+	read_lock(&tasklist_lock);
+	for_each_process(p)
+		if ((p->flags & PF_NOFREEZE) || p == current)
+			task_count++;
+	read_unlock(&tasklist_lock);
+
+	/* 
+	 * Allocate attention list structs.
+	 */
+	for (i = 0; i < task_count; i++) {
+		struct attention_list *this =
+			kmalloc(sizeof(struct attention_list), GFP_ATOMIC);
+		if (!this) {
+			printk("Failed to allocate slab for attention list.\n");
+			set_result_state(SUSPEND_ABORTED);
+			goto free_attention_list;
+		}
+		this->next = NULL;
+		if (attention_list) {
+			last->next = this;
+			last = this;
+		} else
+			attention_list = last = this;
+	}
+
+	next = attention_list;
+	read_lock(&tasklist_lock);
+	for_each_process(p)
+		if ((p->flags & PF_NOFREEZE) || p == current) {
+			next->task = p;
+			next = next->next;
+		}
+	read_unlock(&tasklist_lock);
+
+	/* 
+	 * Because the tasks in attention_list are ones related to suspending,
+	 * we know that they won't go away under us.
+	 */
+
+free_attention_list:
+	while (attention_list) {
+		if (!test_result_state(SUSPEND_ABORTED))
+			suspend_mark_task_as_pageset(attention_list->task, PAGESET1);
+		last = attention_list;
+		attention_list = attention_list->next;
+		kfree(last);
+	}
+}
+
+void suspend_reset_alt_image_pageset2_pfn(void)
+{
+	ps2_pfn = max_pfn + 1;
+}
+
+static struct page *first_conflicting_page;
+
+/*
+ * free_conflicting_pages
+ */
+
+void free_conflicting_pages(void)
+{
+	while (first_conflicting_page) {
+		struct page *next = *((struct page **) kmap(first_conflicting_page));
+		kunmap(first_conflicting_page);
+		__free_page(first_conflicting_page);
+		first_conflicting_page = next;
+	}
+}
+
+/* __suspend_get_nonconflicting_page
+ *
+ * Description: Gets order zero pages that won't be overwritten
+ *		while copying the original pages.
+ */
+
+struct page * ___suspend_get_nonconflicting_page(int can_be_highmem)
+{
+	struct page *page;
+	int flags = GFP_ATOMIC | __GFP_NOWARN | __GFP_ZERO;
+	if (can_be_highmem)
+		flags |= __GFP_HIGHMEM;
+
+
+	if (test_suspend_state(SUSPEND_LOADING_ALT_IMAGE) && pageset2_map &&
+				(ps2_pfn < (max_pfn + 2))) {
+		/*
+		 * ps2_pfn = max_pfn + 1 when yet to find first ps2 pfn that can
+		 * 		be used.
+		 * 	   = 0..max_pfn when going through list.
+		 * 	   = max_pfn + 2 when gone through whole list.
+		 */
+		do {
+			ps2_pfn = get_next_bit_on(pageset2_map, ps2_pfn);
+			if (ps2_pfn <= max_pfn) {
+				page = pfn_to_page(ps2_pfn);
+				if (!PagePageset1(page) &&
+				    (can_be_highmem || !PageHighMem(page)))
+					return page;
+			} else
+				ps2_pfn++;
+		} while (ps2_pfn < max_pfn);
+	}
+
+	do {
+		page = alloc_pages(flags, 0);
+		if (!page) {
+			printk("Failed to get nonconflicting page.\n");
+			return 0;
+		}
+		if (PagePageset1(page)) {
+			struct page **next = (struct page **) kmap(page);
+			*next = first_conflicting_page;
+			first_conflicting_page = page;
+			kunmap(page);
+		}
+	} while(PagePageset1(page));
+
+	return page;
+}
+
+unsigned long __suspend_get_nonconflicting_page(void)
+{
+	struct page *page = ___suspend_get_nonconflicting_page(0);
+	return page ? (unsigned long) page_address(page) : 0;
+}
+
+struct pbe *get_next_pbe(struct page **page_ptr, struct pbe *this_pbe, int highmem)
+{
+	if (((((unsigned long) this_pbe) & (PAGE_SIZE - 1)) 
+		     + 2 * sizeof(struct pbe)) > PAGE_SIZE) {
+		struct page *new_page =
+			___suspend_get_nonconflicting_page(highmem);
+		if (!new_page)
+			return ERR_PTR(-ENOMEM);
+		this_pbe = (struct pbe *) kmap(new_page);
+		memset(this_pbe, 0, PAGE_SIZE);
+		*page_ptr = new_page;
+	} else
+		this_pbe++;
+
+	return this_pbe;
+}
+
+/* get_pageset1_load_addresses
+ * 
+ * Description: We check here that pagedir & pages it points to won't collide
+ * 		with pages where we're going to restore from the loaded pages
+ * 		later.
+ * Returns:	Zero on success, one if couldn't find enough pages (shouldn't
+ * 		happen).
+ */
+
+int suspend_get_pageset1_load_addresses(void)
+{
+	int pfn, highallocd = 0, lowallocd = 0;
+	int low_needed = pagedir1.size - get_highmem_size(pagedir1);
+	int high_needed = get_highmem_size(pagedir1);
+	int low_pages_for_highmem = 0;
+	unsigned long flags = GFP_ATOMIC | __GFP_NOWARN | __GFP_HIGHMEM;
+	struct page *page, *high_pbe_page = NULL, *last_high_pbe_page = NULL,
+		    *low_pbe_page;
+	struct pbe **last_low_pbe_ptr = &restore_pblist,
+		   **last_high_pbe_ptr = &restore_highmem_pblist,
+		   *this_low_pbe = NULL, *this_high_pbe = NULL;
+	int orig_low_pfn = max_pfn + 1, orig_high_pfn = max_pfn + 1;
+	int high_pbes_done=0, low_pbes_done=0;
+	int low_direct = 0, high_direct = 0;
+	int high_to_free, low_to_free;
+
+	/* First, allocate pages for the start of our pbe lists. */
+	if (high_needed) {
+		high_pbe_page = ___suspend_get_nonconflicting_page(1);
+		if (!high_pbe_page)
+			return 1;
+		this_high_pbe = (struct pbe *) kmap(high_pbe_page);
+		memset(this_high_pbe, 0, PAGE_SIZE);
+	}
+
+	low_pbe_page = ___suspend_get_nonconflicting_page(0);
+	if (!low_pbe_page)
+		return 1;
+	this_low_pbe = (struct pbe *) page_address(low_pbe_page);
+
+	/* 
+	 * Next, allocate all possible memory to find where we can
+	 * load data directly into destination pages. I'd like to do
+	 * this in bigger chunks, but then we can't free pages
+	 * individually later.
+	 */
+
+	do {
+		page = alloc_pages(flags, 0);
+		if (page)
+			SetPagePageset1Copy(page);
+	} while (page);
+
+	/* 
+	 * Find out how many high- and lowmem pages we allocated above,
+	 * and how many pages we can reload directly to their original
+	 * location.
+	 */
+	BITMAP_FOR_EACH_SET(pageset1_copy_map, pfn) {
+		int is_high;
+		page = pfn_to_page(pfn);
+		is_high = PageHighMem(page);
+
+		if (PagePageset1(page)) {
+			if (test_action_state(SUSPEND_NO_DIRECT_LOAD)) {
+				ClearPagePageset1Copy(page);
+				__free_page(page);
+				continue;
+			} else {
+				if (is_high)
+					high_direct++;
+				else
+					low_direct++;
+			}
+		} else {
+			if (is_high)
+				highallocd++;
+			else
+				lowallocd++;
+		}
+	}
+
+	high_needed-= high_direct;
+	low_needed-= low_direct;
+
+	/*
+	 * Do we need to use some lowmem pages for the copies of highmem
+	 * pages?
+	 */
+	if (high_needed > highallocd) {
+		low_pages_for_highmem = high_needed - highallocd;
+		high_needed -= low_pages_for_highmem;
+		low_needed += low_pages_for_highmem;
+	}
+	
+	high_to_free = highallocd - high_needed;
+	low_to_free = lowallocd - low_needed;
+
+	/*
+	 * Now generate our pbes (which will be used for the atomic restore,
+	 * and free unneeded pages.
+	 */
+	BITMAP_FOR_EACH_SET(pageset1_copy_map, pfn) {
+		int is_high;
+		page = pfn_to_page(pfn);
+		is_high = PageHighMem(page);
+
+		if (PagePageset1(page))
+			continue;
+
+		/* Free the page? */
+		if ((is_high && high_to_free) ||
+		    (!is_high && low_to_free)) {
+			ClearPagePageset1Copy(page);
+			__free_page(page);
+			if (is_high)
+				high_to_free--;
+			else
+				low_to_free--;
+			continue;
+		}
+
+		/* Nope. We're going to use this page. Add a pbe. */
+		if (is_high || low_pages_for_highmem) {
+			struct page *orig_page;
+			high_pbes_done++;
+			if (!is_high)
+				low_pages_for_highmem--;
+			do {
+				orig_high_pfn = get_next_bit_on(pageset1_map,
+						orig_high_pfn);
+				BUG_ON(orig_high_pfn > max_pfn);
+				orig_page = pfn_to_page(orig_high_pfn);
+			} while(!PageHighMem(orig_page) || load_direct(orig_page));
+
+			this_high_pbe->orig_address = orig_page;
+			this_high_pbe->address = page;
+			this_high_pbe->next = NULL;
+			if (last_high_pbe_page != high_pbe_page) {
+				*last_high_pbe_ptr = (struct pbe *) high_pbe_page;
+				if (!last_high_pbe_page)
+					last_high_pbe_page = high_pbe_page;
+			} else
+				*last_high_pbe_ptr = this_high_pbe;
+			last_high_pbe_ptr = &this_high_pbe->next;
+			if (last_high_pbe_page != high_pbe_page) {
+				kunmap(last_high_pbe_page);
+				last_high_pbe_page = high_pbe_page;
+			}
+			this_high_pbe = get_next_pbe(&high_pbe_page, this_high_pbe, 1);
+			if (IS_ERR(this_high_pbe)) {
+				printk("This high pbe is an error.\n");
+				return -ENOMEM;
+			}
+		} else {
+			struct page *orig_page;
+			low_pbes_done++;
+			do {
+				orig_low_pfn = get_next_bit_on(pageset1_map,
+						orig_low_pfn);
+				BUG_ON(orig_low_pfn > max_pfn);
+				orig_page = pfn_to_page(orig_low_pfn);
+			} while(PageHighMem(orig_page) || load_direct(orig_page));
+
+			this_low_pbe->orig_address = page_address(orig_page);
+			this_low_pbe->address = page_address(page);
+			this_low_pbe->next = NULL;
+			*last_low_pbe_ptr = this_low_pbe;
+			last_low_pbe_ptr = &this_low_pbe->next;
+			this_low_pbe = get_next_pbe(&low_pbe_page, this_low_pbe, 0);
+			if (IS_ERR(this_low_pbe)) {
+				printk("this_low_pbe is an error.\n");
+				return -ENOMEM;
+			}
+		}
+	}
+
+	if (high_pbe_page)
+		kunmap(high_pbe_page);
+
+	if (last_high_pbe_page != high_pbe_page) {
+		if (last_high_pbe_page)
+			kunmap(last_high_pbe_page);
+		__free_page(high_pbe_page);
+	}
+
+	free_conflicting_pages();
+
+	return 0;
+}
diff --git a/kernel/power/pagedir.h b/kernel/power/pagedir.h
new file mode 100644
index 0000000..2ae395f
--- /dev/null
+++ b/kernel/power/pagedir.h
@@ -0,0 +1,51 @@
+/*
+ * kernel/power/pagedir.h
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Declarations for routines for handling pagesets.
+ */
+
+#ifndef KERNEL_POWER_PAGEDIR_H
+#define KERNEL_POWER_PAGEDIR_H
+
+/* Pagedir
+ *
+ * Contains the metadata for a set of pages saved in the image.
+ */
+
+struct pagedir {
+	int id;
+	int size;
+#ifdef CONFIG_HIGHMEM
+	int size_high;
+#endif
+};
+
+#ifdef CONFIG_HIGHMEM
+#define get_highmem_size(pagedir) (pagedir.size_high)
+#define set_highmem_size(pagedir, sz) do { pagedir.size_high = sz; } while(0)
+#define inc_highmem_size(pagedir) do { pagedir.size_high++; } while(0)
+#define get_lowmem_size(pagedir) (pagedir.size - pagedir.size_high)
+#else
+#define get_highmem_size(pagedir) (0)
+#define set_highmem_size(pagedir, sz) do { } while(0)
+#define inc_highmem_size(pagedir) do { } while(0)
+#define get_lowmem_size(pagedir) (pagedir.size)
+#endif
+
+extern struct pagedir pagedir1, pagedir2;
+
+extern void suspend_copy_pageset1(void);
+
+extern void suspend_mark_pages_for_pageset2(void);
+
+extern int suspend_get_pageset1_load_addresses(void);
+
+extern unsigned long __suspend_get_nonconflicting_page(void);
+struct page * ___suspend_get_nonconflicting_page(int can_be_highmem);
+
+extern void suspend_reset_alt_image_pageset2_pfn(void);
+#endif
diff --git a/kernel/power/pageflags.c b/kernel/power/pageflags.c
new file mode 100644
index 0000000..dccac97
--- /dev/null
+++ b/kernel/power/pageflags.c
@@ -0,0 +1,149 @@
+/*
+ * kernel/power/pageflags.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ * 
+ * This file is released under the GPLv2.
+ *
+ * Routines for serialising and relocating pageflags in which we
+ * store our image metadata.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/list.h>
+#include <linux/suspend.h>
+#include "pageflags.h"
+#include "modules.h"
+#include "pagedir.h"
+#include "suspend.h"
+
+dyn_pageflags_t pageset2_map;
+dyn_pageflags_t page_resave_map;
+dyn_pageflags_t io_map;
+
+static int pages_for_zone(struct zone *zone)
+{
+	return DIV_ROUND_UP(zone->spanned_pages, (PAGE_SIZE << 3));
+}
+
+int suspend_pageflags_space_needed(void)
+{
+	int total = 0;
+	struct zone *zone;
+
+	for_each_zone(zone)
+		if (populated_zone(zone))
+			total += sizeof(int) * 3 + pages_for_zone(zone) * PAGE_SIZE;
+
+	total += sizeof(int);
+
+	return total;
+}
+
+/* save_dyn_pageflags
+ *
+ * Description: Save a set of pageflags.
+ * Arguments:   dyn_pageflags_t *: Pointer to the bitmap being saved.
+ */
+
+void save_dyn_pageflags(dyn_pageflags_t pagemap)
+{
+	int i, zone_idx, size, node = 0;
+	struct zone *zone;
+	struct pglist_data *pgdat;
+
+	if (!*pagemap)
+		return;
+
+	for_each_online_pgdat(pgdat) {
+		for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+			zone = &pgdat->node_zones[zone_idx];
+
+			if (!populated_zone(zone))
+				continue;
+
+			suspendActiveAllocator->rw_header_chunk(WRITE, NULL,
+					(char *) &node, sizeof(int));
+			suspendActiveAllocator->rw_header_chunk(WRITE, NULL,
+					(char *) &zone_idx, sizeof(int));
+			size = pages_for_zone(zone);
+			suspendActiveAllocator->rw_header_chunk(WRITE, NULL,
+					(char *) &size, sizeof(int));
+
+			for (i = 0; i < size; i++)
+				suspendActiveAllocator->rw_header_chunk(WRITE,
+					NULL, (char *) pagemap[node][zone_idx][i],
+					PAGE_SIZE);
+		}
+		node++;
+	}
+	node = -1;
+	suspendActiveAllocator->rw_header_chunk(WRITE, NULL,
+			(char *) &node, sizeof(int));
+}
+
+/* load_dyn_pageflags
+ *
+ * Description: Load a set of pageflags.
+ * Arguments:   dyn_pageflags_t *: Pointer to the bitmap being loaded.
+ *              (It must be allocated before calling this routine).
+ */
+
+int load_dyn_pageflags(dyn_pageflags_t pagemap)
+{
+	int i, zone_idx, zone_check = 0, size, node = 0;
+	struct zone *zone;
+	struct pglist_data *pgdat;
+
+	if (!pagemap)
+		return 1;
+
+	for_each_online_pgdat(pgdat) {
+		for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+			zone = &pgdat->node_zones[zone_idx];
+
+			if (!populated_zone(zone))
+				continue;
+
+			/* Same node? */
+			suspendActiveAllocator->rw_header_chunk(READ, NULL,
+					(char *) &zone_check, sizeof(int));
+			if (zone_check != node) {
+				printk("Node read (%d) != node (%d).\n",
+						zone_check, node);
+				return 1;
+			}
+
+			/* Same zone? */
+			suspendActiveAllocator->rw_header_chunk(READ, NULL,
+					(char *) &zone_check, sizeof(int));
+			if (zone_check != zone_idx) {
+				printk("Zone read (%d) != node (%d).\n",
+						zone_check, zone_idx);
+				return 1;
+			}
+
+
+			suspendActiveAllocator->rw_header_chunk(READ, NULL,
+				(char *) &size, sizeof(int));
+
+			for (i = 0; i < size; i++)
+				suspendActiveAllocator->rw_header_chunk(READ, NULL,
+					(char *) pagemap[node][zone_idx][i],
+					PAGE_SIZE);
+		}
+		node++;
+	}
+	suspendActiveAllocator->rw_header_chunk(READ, NULL, (char *) &zone_check,
+			sizeof(int));
+	if (zone_check != -1) {
+		printk("Didn't read end of dyn pageflag data marker.(%x)\n",
+				zone_check);
+		return 1;
+	}
+
+	return 0;
+}
diff --git a/kernel/power/pageflags.h b/kernel/power/pageflags.h
new file mode 100644
index 0000000..405cbce
--- /dev/null
+++ b/kernel/power/pageflags.h
@@ -0,0 +1,49 @@
+/*
+ * kernel/power/pageflags.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Suspend2 needs a few pageflags while working that aren't otherwise
+ * used. To save the struct page pageflags, we dynamically allocate
+ * a bitmap and use that. These are the only non order-0 allocations
+ * we do.
+ *
+ * NOTE!!!
+ * We assume that PAGE_SIZE - sizeof(void *) is a multiple of
+ * sizeof(unsigned long). Is this ever false?
+ */
+
+#include <linux/dyn_pageflags.h>
+#include <linux/suspend.h>
+
+extern dyn_pageflags_t pageset1_map;
+extern dyn_pageflags_t pageset1_copy_map;
+extern dyn_pageflags_t pageset2_map;
+extern dyn_pageflags_t page_resave_map;
+extern dyn_pageflags_t io_map;
+
+#define PagePageset1(page) (test_dynpageflag(&pageset1_map, page))
+#define SetPagePageset1(page) (set_dynpageflag(&pageset1_map, page))
+#define ClearPagePageset1(page) (clear_dynpageflag(&pageset1_map, page))
+
+#define PagePageset1Copy(page) (test_dynpageflag(&pageset1_copy_map, page))
+#define SetPagePageset1Copy(page) (set_dynpageflag(&pageset1_copy_map, page))
+#define ClearPagePageset1Copy(page) (clear_dynpageflag(&pageset1_copy_map, page))
+
+#define PagePageset2(page) (test_dynpageflag(&pageset2_map, page))
+#define SetPagePageset2(page) (set_dynpageflag(&pageset2_map, page))
+#define ClearPagePageset2(page) (clear_dynpageflag(&pageset2_map, page))
+
+#define PageWasRW(page) (test_dynpageflag(&pageset2_map, page))
+#define SetPageWasRW(page) (set_dynpageflag(&pageset2_map, page))
+#define ClearPageWasRW(page) (clear_dynpageflag(&pageset2_map, page))
+
+#define PageResave(page) (page_resave_map ? test_dynpageflag(&page_resave_map, page) : 0)
+#define SetPageResave(page) (set_dynpageflag(&page_resave_map, page))
+#define ClearPageResave(page) (clear_dynpageflag(&page_resave_map, page))
+
+extern void save_dyn_pageflags(dyn_pageflags_t pagemap);
+extern int load_dyn_pageflags(dyn_pageflags_t pagemap);
+extern int suspend_pageflags_space_needed(void);
diff --git a/kernel/power/power.h b/kernel/power/power.h
index eb461b8..a4d6550 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -1,5 +1,11 @@
+/*
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ */
+
 #include <linux/suspend.h>
 #include <linux/utsname.h>
+#include "suspend.h"
+#include "suspend2_builtin.h"
 
 struct swsusp_info {
 	struct new_utsname	uts;
@@ -15,11 +21,15 @@ struct swsusp_info {
 
 #ifdef CONFIG_SOFTWARE_SUSPEND
 extern int pm_suspend_disk(void);
-
+extern char resume_file[256];
 #else
 static inline int pm_suspend_disk(void)
 {
-	return -EPERM;
+#ifdef CONFIG_SUSPEND2
+	return suspend2_try_suspend(1);
+#else
+	return -ENODEV;
+#endif
 }
 #endif
 
@@ -40,6 +50,8 @@ extern struct subsystem power_subsys;
 /* References to section boundaries */
 extern const void __nosave_begin, __nosave_end;
 
+extern struct pbe *restore_pblist;
+
 /* Preferred image size in bytes (default 500 MB) */
 extern unsigned long image_size;
 extern int in_suspend;
@@ -177,3 +189,11 @@ extern int suspend_enter(suspend_state_t state);
 struct timeval;
 extern void swsusp_show_speed(struct timeval *, struct timeval *,
 				unsigned int, char *);
+extern struct page *saveable_page(unsigned long pfn);
+#ifdef CONFIG_HIGHMEM
+extern struct page *saveable_highmem_page(unsigned long pfn);
+#else
+static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
+#endif
+
+#define PBES_PER_PAGE (PAGE_SIZE / sizeof(struct pbe))
diff --git a/kernel/power/power_off.c b/kernel/power/power_off.c
new file mode 100644
index 0000000..7db6186
--- /dev/null
+++ b/kernel/power/power_off.c
@@ -0,0 +1,109 @@
+/*
+ * kernel/power/power_off.c
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Support for powering down.
+ */
+
+#include <linux/device.h>
+#include <linux/suspend.h>
+#include <linux/mm.h>
+#include <linux/pm.h>
+#include <linux/reboot.h>
+#include <linux/cpu.h>
+#include <linux/console.h>
+#include "suspend.h"
+#include "ui.h"
+#include "power_off.h"
+#include "power.h"
+
+unsigned long suspend2_poweroff_method = 0; /* 0 - Kernel power off */
+
+/*
+ * suspend2_power_down
+ * Functionality   : Powers down or reboots the computer once the image
+ *                   has been written to disk.
+ * Key Assumptions : Able to reboot/power down via code called or that
+ *                   the warning emitted if the calls fail will be visible
+ *                   to the user (ie printk resumes devices).
+ * Called From     : do_suspend2_suspend_2
+ */
+
+void suspend2_power_down(void)
+{
+	int result = 0;
+
+	if (test_action_state(SUSPEND_REBOOT)) {
+		suspend_prepare_status(DONT_CLEAR_BAR, "Ready to reboot.");
+		kernel_restart(NULL);
+	}
+
+	suspend_prepare_status(DONT_CLEAR_BAR, "Powering down.");
+
+	switch (suspend2_poweroff_method) {
+		case 0:
+			break;
+		case 3:
+			suspend_console();
+
+			if (device_suspend(PMSG_SUSPEND)) {
+				suspend_prepare_status(DONT_CLEAR_BAR, "Device "
+					"suspend failure. Doing poweroff.");
+				goto ResumeConsole;
+			}
+
+			if (!pm_ops ||
+			    (pm_ops->prepare && pm_ops->prepare(PM_SUSPEND_MEM)))
+				goto DeviceResume;
+
+			if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG) &&
+				disable_nonboot_cpus())
+				goto PmOpsFinish;
+	
+			if (!suspend_enter(PM_SUSPEND_MEM))
+				result = 1;
+
+			if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG))
+				enable_nonboot_cpus();
+
+PmOpsFinish:
+			if (pm_ops->finish)
+				pm_ops->finish(PM_SUSPEND_MEM);
+
+DeviceResume:
+			device_resume();
+
+ResumeConsole:
+			resume_console();
+
+			/* If suspended to ram and later woke. */
+			if (result)
+				return;
+			break;
+		case 4:
+		case 5:
+			if (!pm_ops ||
+			    (pm_ops->prepare && pm_ops->prepare(PM_SUSPEND_MAX)))
+				break;
+
+			kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
+			suspend_enter(suspend2_poweroff_method);
+
+			/* Failed. Fall back to kernel_power_off etc. */
+			if (pm_ops->finish)
+				pm_ops->finish(PM_SUSPEND_MAX);
+	}
+
+	suspend_prepare_status(DONT_CLEAR_BAR, "Falling back to alternate power off method.");
+	kernel_power_off();
+	kernel_halt();
+	suspend_prepare_status(DONT_CLEAR_BAR, "Powerdown failed.");
+	while (1)
+		cpu_relax();
+}
+
+EXPORT_SYMBOL_GPL(suspend2_poweroff_method);
+EXPORT_SYMBOL_GPL(suspend2_power_down);
diff --git a/kernel/power/power_off.h b/kernel/power/power_off.h
new file mode 100644
index 0000000..40e0c46
--- /dev/null
+++ b/kernel/power/power_off.h
@@ -0,0 +1,13 @@
+/*
+ * kernel/power/power_off.h
+ *
+ * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Support for the powering down.
+ */
+
+int suspend_pm_state_finish(void);
+void suspend2_power_down(void);
+extern unsigned long suspend2_poweroff_method;
diff --git a/kernel/power/prepare_image.c b/kernel/power/prepare_image.c
new file mode 100644
index 0000000..779341b
--- /dev/null
+++ b/kernel/power/prepare_image.c
@@ -0,0 +1,798 @@
+/*
+ * kernel/power/prepare_image.c
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * We need to eat memory until we can:
+ * 1. Perform the save without changing anything (RAM_NEEDED < #pages)
+ * 2. Fit it all in available space (suspendActiveAllocator->available_space() >=
+ *    main_storage_needed())
+ * 3. Reload the pagedir and pageset1 to places that don't collide with their
+ *    final destinations, not knowing to what extent the resumed kernel will
+ *    overlap with the one loaded at boot time. I think the resumed kernel
+ *    should overlap completely, but I don't want to rely on this as it is 
+ *    an unproven assumption. We therefore assume there will be no overlap at
+ *    all (worse case).
+ * 4. Meet the user's requested limit (if any) on the size of the image.
+ *    The limit is in MB, so pages/256 (assuming 4K pages).
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/freezer.h>
+#include <linux/hardirq.h>
+#include <linux/mmzone.h>
+#include <linux/console.h>
+
+#include "pageflags.h"
+#include "modules.h"
+#include "io.h"
+#include "ui.h"
+#include "extent.h"
+#include "prepare_image.h"
+#include "block_io.h"
+#include "suspend.h"
+#include "checksum.h"
+#include "sysfs.h"
+
+static int num_nosave = 0;
+static int header_space_allocated = 0;
+static int main_storage_allocated = 0;
+static int storage_available = 0;
+int extra_pd1_pages_allowance = MIN_EXTRA_PAGES_ALLOWANCE;
+int image_size_limit = 0;
+
+/*
+ * The atomic copy of pageset1 is stored in pageset2 pages.
+ * But if pageset1 is larger (normally only just after boot),
+ * we need to allocate extra pages to store the atomic copy.
+ * The following data struct and functions are used to handle
+ * the allocation and freeing of that memory.
+ */
+
+static int extra_pages_allocated;
+
+struct extras {
+	struct page *page;
+	int order;
+	struct extras *next;
+};
+
+static struct extras *extras_list;
+
+/* suspend_free_extra_pagedir_memory
+ *
+ * Description:	Free previously allocated extra pagedir memory.
+ */
+void suspend_free_extra_pagedir_memory(void)
+{
+	/* Free allocated pages */
+	while (extras_list) {
+		struct extras *this = extras_list;
+		int i;
+
+		extras_list = this->next;
+
+		for (i = 0; i < (1 << this->order); i++)
+			ClearPageNosave(this->page + i);
+
+		__free_pages(this->page, this->order);
+		kfree(this);
+	}
+
+	extra_pages_allocated = 0;
+}
+
+/* suspend_allocate_extra_pagedir_memory
+ *
+ * Description:	Allocate memory for making the atomic copy of pagedir1 in the
+ * 		case where it is bigger than pagedir2.
+ * Arguments:	int	num_to_alloc: Number of extra pages needed.
+ * Result:	int. 	Number of extra pages we now have allocated.
+ */
+static int suspend_allocate_extra_pagedir_memory(int extra_pages_needed)
+{
+	int j, order, num_to_alloc = extra_pages_needed - extra_pages_allocated;
+	unsigned long flags = GFP_ATOMIC | __GFP_NOWARN;
+
+	if (num_to_alloc < 1)
+		return 0;
+
+	order = fls(num_to_alloc);
+	if (order >= MAX_ORDER)
+		order = MAX_ORDER - 1;
+
+	while (num_to_alloc) {
+		struct page *newpage;
+		unsigned long virt;
+		struct extras *extras_entry;
+			
+		while ((1 << order) > num_to_alloc)
+			order--;
+
+		extras_entry = (struct extras *) kmalloc(sizeof(struct extras),
+			GFP_ATOMIC);
+
+		if (!extras_entry)
+			return extra_pages_allocated;
+
+		virt = __get_free_pages(flags, order);
+		while (!virt && order) {
+			order--;
+			virt = __get_free_pages(flags, order);
+		}
+
+		if (!virt) {
+			kfree(extras_entry);
+			return extra_pages_allocated;
+		}
+
+		newpage = virt_to_page(virt);
+
+		extras_entry->page = newpage;
+		extras_entry->order = order;
+		extras_entry->next = NULL;
+
+		if (extras_list)
+			extras_entry->next = extras_list;
+
+		extras_list = extras_entry;
+
+		for (j = 0; j < (1 << order); j++) {
+			SetPageNosave(newpage + j);
+			SetPagePageset1Copy(newpage + j);
+		}
+
+		extra_pages_allocated += (1 << order);
+		num_to_alloc -= (1 << order);
+	}
+
+	return extra_pages_allocated;
+}
+
+/*
+ * real_nr_free_pages: Count pcp pages for a zone type or all zones
+ * (-1 for all, otherwise zone_idx() result desired).
+ */
+int real_nr_free_pages(unsigned long zone_idx_mask)
+{
+	struct zone *zone;
+	int result = 0, i = 0, cpu;
+
+	/* PCP lists */
+	for_each_zone(zone) {
+		if (!populated_zone(zone))
+			continue;
+		
+		if (!(zone_idx_mask & (1 << zone_idx(zone))))
+			continue;
+
+		for_each_online_cpu(cpu) {
+			struct per_cpu_pageset *pset = zone_pcp(zone, cpu);
+
+			for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) {
+				struct per_cpu_pages *pcp;
+
+				pcp = &pset->pcp[i];
+				result += pcp->count;
+			}
+		}
+
+		result += zone_page_state(zone, NR_FREE_PAGES);
+	}
+	return result;
+}
+
+/*
+ * Discover how much extra memory will be required by the drivers
+ * when they're asked to suspend. We can then ensure that amount
+ * of memory is available when we really want it.
+ */
+static void get_extra_pd1_allowance(void)
+{
+	int orig_num_free = real_nr_free_pages(all_zones_mask), final;
+	
+	suspend_prepare_status(CLEAR_BAR, "Finding allowance for drivers.");
+
+	suspend_console();
+	device_suspend(PMSG_FREEZE);
+	local_irq_disable(); /* irqs might have been re-enabled on us */
+	device_power_down(PMSG_FREEZE);
+	
+	final = real_nr_free_pages(all_zones_mask);
+
+	device_power_up();
+	local_irq_enable();
+	device_resume();
+	resume_console();
+
+	extra_pd1_pages_allowance = max(
+		orig_num_free - final + MIN_EXTRA_PAGES_ALLOWANCE,
+		MIN_EXTRA_PAGES_ALLOWANCE);
+}
+
+/*
+ * Amount of storage needed, possibly taking into account the
+ * expected compression ratio and possibly also ignoring our
+ * allowance for extra pages.
+ */
+static int main_storage_needed(int use_ecr,
+		int ignore_extra_pd1_allow)
+{
+	return ((pagedir1.size + pagedir2.size +
+	  (ignore_extra_pd1_allow ? 0 : extra_pd1_pages_allowance)) *
+	 (use_ecr ? suspend_expected_compression_ratio() : 100) / 100);
+}
+
+/*
+ * Storage needed for the image header, in bytes until the return.
+ */
+static int header_storage_needed(void)
+{
+	int bytes = (int) sizeof(struct suspend_header) +
+			suspend_header_storage_for_modules() +
+			suspend_pageflags_space_needed();
+
+	return DIV_ROUND_UP(bytes, PAGE_SIZE);
+}
+
+/*
+ * When freeing memory, pages from either pageset might be freed.
+ *
+ * When seeking to free memory to be able to suspend, for every ps1 page freed,
+ * we need 2 less pages for the atomic copy because there is one less page to
+ * copy and one more page into which data can be copied.
+ *
+ * Freeing ps2 pages saves us nothing directly. No more memory is available
+ * for the atomic copy. Indirectly, a ps1 page might be freed (slab?), but
+ * that's too much work to figure out.
+ *
+ * => ps1_to_free functions
+ *
+ * Of course if we just want to reduce the image size, because of storage
+ * limitations or an image size limit either ps will do.
+ *
+ * => any_to_free function
+ */
+
+static int highpages_ps1_to_free(void)
+{
+	return max_t(int, 0, DIV_ROUND_UP(get_highmem_size(pagedir1) -
+		get_highmem_size(pagedir2), 2) - real_nr_free_high_pages());
+}
+
+static int lowpages_ps1_to_free(void)
+{
+	return max_t(int, 0, DIV_ROUND_UP(get_lowmem_size(pagedir1) +
+		extra_pd1_pages_allowance + MIN_FREE_RAM +
+		suspend_memory_for_modules() - get_lowmem_size(pagedir2) -
+		real_nr_free_low_pages() - extra_pages_allocated, 2));
+}
+
+static int current_image_size(void)
+{
+	return pagedir1.size + pagedir2.size + header_space_allocated;
+}
+
+static int any_to_free(int use_image_size_limit)
+{
+	int user_limit = (use_image_size_limit && image_size_limit > 0) ?
+		max_t(int, 0, current_image_size() - (image_size_limit << 8))
+		: 0;
+
+	int storage_limit = max_t(int, 0,
+			main_storage_needed(1, 1) - storage_available);
+
+	return max(user_limit, storage_limit);
+}
+
+/* amount_needed
+ *
+ * Calculates the amount by which the image size needs to be reduced to meet
+ * our constraints.
+ */
+static int amount_needed(int use_image_size_limit)
+{
+	return max(highpages_ps1_to_free() + lowpages_ps1_to_free(),
+			any_to_free(use_image_size_limit));
+}
+
+static int image_not_ready(int use_image_size_limit)
+{
+	suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_LOW, 1,
+		"Amount still needed (%d) > 0:%d. Header: %d < %d: %d,"
+		" Storage allocd: %d < %d: %d.\n",
+			amount_needed(use_image_size_limit),
+			(amount_needed(use_image_size_limit) > 0),
+			header_space_allocated, header_storage_needed(),
+			header_space_allocated < header_storage_needed(),
+		 	main_storage_allocated,
+			main_storage_needed(1, 1),
+			main_storage_allocated < main_storage_needed(1, 1));
+
+	suspend_cond_pause(0, NULL);
+
+	return ((amount_needed(use_image_size_limit) > 0) ||
+		header_space_allocated < header_storage_needed() ||
+		 main_storage_allocated < main_storage_needed(1, 1));
+}
+
+static void display_stats(int always, int sub_extra_pd1_allow)
+{ 
+	char buffer[255];
+	snprintf(buffer, 254, 
+		"Free:%d(%d). Sets:%d(%d),%d(%d). Header:%d/%d. Nosave:%d-%d"
+		"=%d. Storage:%u/%u(%u=>%u). Needed:%d,%d,%d(%d,%d,%d,%d)\n",
+		
+		/* Free */
+		real_nr_free_pages(all_zones_mask),
+		real_nr_free_low_pages(),
+		
+		/* Sets */
+		pagedir1.size, pagedir1.size - get_highmem_size(pagedir1),
+		pagedir2.size, pagedir2.size - get_highmem_size(pagedir2),
+
+		/* Header */
+		header_space_allocated, header_storage_needed(),
+
+		/* Nosave */
+		num_nosave, extra_pages_allocated,
+		num_nosave - extra_pages_allocated,
+
+		/* Storage */
+		main_storage_allocated,
+		storage_available,
+		main_storage_needed(1, sub_extra_pd1_allow),
+		main_storage_needed(1, 1),
+
+		/* Needed */
+		lowpages_ps1_to_free(), highpages_ps1_to_free(),
+		any_to_free(1),
+		MIN_FREE_RAM, suspend_memory_for_modules(),
+		extra_pd1_pages_allowance, image_size_limit << 8);
+
+	if (always)
+		printk(buffer);
+	else
+		suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_MEDIUM, 1, buffer);
+}
+
+/* generate_free_page_map
+ *
+ * Description:	This routine generates a bitmap of free pages from the
+ * 		lists used by the memory manager. We then use the bitmap
+ * 		to quickly calculate which pages to save and in which
+ * 		pagesets.
+ */
+static void generate_free_page_map(void) 
+{
+	int order, loop, cpu;
+	struct page *page;
+	unsigned long flags, i;
+	struct zone *zone;
+
+	for_each_zone(zone) {
+		if (!populated_zone(zone))
+			continue;
+		
+		spin_lock_irqsave(&zone->lock, flags);
+
+		for(i=0; i < zone->spanned_pages; i++)
+			ClearPageNosaveFree(pfn_to_page(
+						zone->zone_start_pfn + i));
+	
+		for (order = MAX_ORDER - 1; order >= 0; --order)
+			list_for_each_entry(page,
+					&zone->free_area[order].free_list, lru)
+				for(loop=0; loop < (1 << order); loop++)
+					SetPageNosaveFree(page+loop);
+
+		
+		for_each_online_cpu(cpu) {
+			struct per_cpu_pageset *pset = zone_pcp(zone, cpu);
+
+			for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) {
+				struct per_cpu_pages *pcp;
+				struct page *page;
+
+				pcp = &pset->pcp[i];
+				list_for_each_entry(page, &pcp->list, lru)
+					SetPageNosaveFree(page);
+			}
+		}
+		
+		spin_unlock_irqrestore(&zone->lock, flags);
+	}
+}
+
+/* size_of_free_region
+ * 
+ * Description:	Return the number of pages that are free, beginning with and 
+ * 		including this one.
+ */
+static int size_of_free_region(struct page *page)
+{
+	struct zone *zone = page_zone(page);
+	struct page *posn = page, *last_in_zone =
+		pfn_to_page(zone->zone_start_pfn) + zone->spanned_pages - 1;
+
+	while (posn <= last_in_zone && PageNosaveFree(posn))
+		posn++;
+	return (posn - page);
+}
+
+/* flag_image_pages
+ *
+ * This routine generates our lists of pages to be stored in each
+ * pageset. Since we store the data using extents, and adding new
+ * extents might allocate a new extent page, this routine may well
+ * be called more than once.
+ */
+static void flag_image_pages(int atomic_copy)
+{
+	int num_free = 0;
+	unsigned long loop;
+	struct zone *zone;
+
+	pagedir1.size = 0;
+	pagedir2.size = 0;
+
+	set_highmem_size(pagedir1, 0);
+	set_highmem_size(pagedir2, 0);
+
+	num_nosave = 0;
+
+	clear_dyn_pageflags(pageset1_map);
+
+	generate_free_page_map();
+
+	/*
+	 * Pages not to be saved are marked Nosave irrespective of being reserved
+	 */
+	for_each_zone(zone) {
+		int highmem = is_highmem(zone);
+
+		if (!populated_zone(zone))
+			continue;
+
+		for (loop = 0; loop < zone->spanned_pages; loop++) {
+			unsigned long pfn = zone->zone_start_pfn + loop;
+			struct page *page;
+			int chunk_size;
+
+			if (!pfn_valid(pfn))
+				continue;
+
+			page = pfn_to_page(pfn);
+
+			chunk_size = size_of_free_region(page);
+			if (chunk_size) {
+				num_free += chunk_size;
+				loop += chunk_size - 1;
+				continue;
+			}
+
+			if (highmem)
+				page = saveable_highmem_page(pfn);
+			else
+				page = saveable_page(pfn);
+
+			if (!page) {
+				num_nosave++;
+				continue;
+			}
+
+			if (PagePageset2(page)) {
+				pagedir2.size++;
+				if (PageHighMem(page))
+					inc_highmem_size(pagedir2);
+				else
+					SetPagePageset1Copy(page);
+				if (PageResave(page)) {
+					SetPagePageset1(page);
+					ClearPagePageset1Copy(page);
+					pagedir1.size++;
+					if (PageHighMem(page))
+						inc_highmem_size(pagedir1);
+				}
+			} else {
+				pagedir1.size++;
+				SetPagePageset1(page);
+				if (PageHighMem(page))
+					inc_highmem_size(pagedir1);
+			}
+		}
+	}
+
+	if (atomic_copy)
+		return;
+
+	suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_MEDIUM, 0,
+		"Count data pages: Set1 (%d) + Set2 (%d) + Nosave (%d) + "
+		"NumFree (%d) = %d.\n",
+		pagedir1.size, pagedir2.size, num_nosave, num_free,
+		pagedir1.size + pagedir2.size + num_nosave + num_free);
+}
+
+void suspend_recalculate_image_contents(int atomic_copy) 
+{
+	clear_dyn_pageflags(pageset1_map);
+	if (!atomic_copy) {
+		int pfn;
+		BITMAP_FOR_EACH_SET(pageset2_map, pfn)
+			ClearPagePageset1Copy(pfn_to_page(pfn));
+		/* Need to call this before getting pageset1_size! */
+		suspend_mark_pages_for_pageset2();
+	}
+	flag_image_pages(atomic_copy);
+
+	if (!atomic_copy) {
+		storage_available = suspendActiveAllocator->storage_available();
+		display_stats(0, 0);
+	}
+}
+
+/* update_image
+ *
+ * Allocate [more] memory and storage for the image.
+ */
+static void update_image(void) 
+{ 
+	int result, param_used, wanted, got;
+
+	suspend_recalculate_image_contents(0);
+
+	/* Include allowance for growth in pagedir1 while writing pagedir 2 */
+	wanted = pagedir1.size +  extra_pd1_pages_allowance -
+		get_lowmem_size(pagedir2);
+	if (wanted > extra_pages_allocated) {
+		got = suspend_allocate_extra_pagedir_memory(wanted);
+		if (wanted < got) {
+			suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_LOW, 1,
+				"Want %d extra pages for pageset1, got %d.\n",
+				wanted, got);
+			return;
+		}
+	}
+
+	thaw_kernel_threads();
+
+	/* 
+	 * Allocate remaining storage space, if possible, up to the
+	 * maximum we know we'll need. It's okay to allocate the
+	 * maximum if the writer is the swapwriter, but
+	 * we don't want to grab all available space on an NFS share.
+	 * We therefore ignore the expected compression ratio here,
+	 * thereby trying to allocate the maximum image size we could
+	 * need (assuming compression doesn't expand the image), but
+	 * don't complain if we can't get the full amount we're after.
+	 */
+
+	suspendActiveAllocator->allocate_storage(
+		min(storage_available, main_storage_needed(0, 0)));
+
+	main_storage_allocated = suspendActiveAllocator->storage_allocated();
+
+	param_used = header_storage_needed();
+
+	result = suspendActiveAllocator->allocate_header_space(param_used);
+
+	if (result)
+		suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_LOW, 1,
+			"Still need to get more storage space for header.\n");
+	else
+		header_space_allocated = param_used;
+
+	if (freeze_processes()) {
+		set_result_state(SUSPEND_FREEZING_FAILED);
+		set_result_state(SUSPEND_ABORTED);
+	}
+
+	allocate_checksum_pages();
+
+	suspend_recalculate_image_contents(0);
+}
+
+/* attempt_to_freeze
+ * 
+ * Try to freeze processes.
+ */
+
+static int attempt_to_freeze(void)
+{
+	int result;
+	
+	/* Stop processes before checking again */
+	thaw_processes();
+	suspend_prepare_status(CLEAR_BAR, "Freezing processes & syncing filesystems.");
+	result = freeze_processes();
+
+	if (result) {
+		set_result_state(SUSPEND_ABORTED);
+		set_result_state(SUSPEND_FREEZING_FAILED);
+	}
+
+	return result;
+}
+
+/* eat_memory
+ *
+ * Try to free some memory, either to meet hard or soft constraints on the image
+ * characteristics.
+ * 
+ * Hard constraints:
+ * - Pageset1 must be < half of memory;
+ * - We must have enough memory free at resume time to have pageset1
+ *   be able to be loaded in pages that don't conflict with where it has to
+ *   be restored.
+ * Soft constraints
+ * - User specificied image size limit.
+ */
+static void eat_memory(void)
+{
+	int amount_wanted = 0;
+	int free_flags = 0, did_eat_memory = 0;
+	
+	/*
+	 * Note that if we have enough storage space and enough free memory, we
+	 * may exit without eating anything. We give up when the last 10
+	 * iterations ate no extra pages because we're not going to get much
+	 * more anyway, but the few pages we get will take a lot of time.
+	 *
+	 * We freeze processes before beginning, and then unfreeze them if we
+	 * need to eat memory until we think we have enough. If our attempts
+	 * to freeze fail, we give up and abort.
+	 */
+
+	suspend_recalculate_image_contents(0);
+	amount_wanted = amount_needed(1);
+
+	switch (image_size_limit) {
+		case -1: /* Don't eat any memory */
+			if (amount_wanted > 0) {
+				set_result_state(SUSPEND_ABORTED);
+				set_result_state(SUSPEND_WOULD_EAT_MEMORY);
+				return;
+			}
+			break;
+		case -2:  /* Free caches only */
+			drop_pagecache();
+			suspend_recalculate_image_contents(0);
+			amount_wanted = amount_needed(1);
+			did_eat_memory = 1;
+			break;
+		default:
+			free_flags = GFP_ATOMIC | __GFP_HIGHMEM;
+	}
+
+	if (amount_wanted > 0 && !test_result_state(SUSPEND_ABORTED) &&
+			image_size_limit != -1) {
+		struct zone *zone;
+		int zone_idx;
+
+		suspend_prepare_status(CLEAR_BAR, "Seeking to free %dMB of memory.", MB(amount_wanted));
+
+		thaw_kernel_threads();
+
+		for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+			int zone_type_free = max_t(int, (zone_idx == ZONE_HIGHMEM) ?
+				highpages_ps1_to_free() :
+				lowpages_ps1_to_free(), amount_wanted);
+
+			if (zone_type_free < 0)
+				break;
+
+			for_each_zone(zone) {
+				if (zone_idx(zone) != zone_idx)
+					continue;
+
+				shrink_one_zone(zone, zone_type_free);
+
+				did_eat_memory = 1;
+
+				suspend_recalculate_image_contents(0);
+
+				amount_wanted = amount_needed(1);
+				zone_type_free = max_t(int, (zone_idx == ZONE_HIGHMEM) ?
+					highpages_ps1_to_free() :
+					lowpages_ps1_to_free(), amount_wanted);
+
+				if (zone_type_free < 0)
+					break;
+			}
+		}
+
+		suspend_cond_pause(0, NULL);
+
+		if (freeze_processes()) {
+			set_result_state(SUSPEND_FREEZING_FAILED);
+			set_result_state(SUSPEND_ABORTED);
+		}
+	}
+	
+	if (did_eat_memory) {
+		unsigned long orig_state = get_suspend_state();
+		/* Freeze_processes will call sys_sync too */
+		restore_suspend_state(orig_state);
+		suspend_recalculate_image_contents(0);
+	}
+
+	/* Blank out image size display */
+	suspend_update_status(100, 100, NULL);
+}
+
+/* suspend_prepare_image
+ *
+ * Entry point to the whole image preparation section.
+ *
+ * We do four things:
+ * - Freeze processes;
+ * - Ensure image size constraints are met;
+ * - Complete all the preparation for saving the image,
+ *   including allocation of storage. The only memory
+ *   that should be needed when we're finished is that
+ *   for actually storing the image (and we know how
+ *   much is needed for that because the modules tell
+ *   us).
+ * - Make sure that all dirty buffers are written out.
+ */
+#define MAX_TRIES 2
+int suspend_prepare_image(void)
+{
+	int result = 1, tries = 1;
+
+	header_space_allocated = 0;
+	main_storage_allocated = 0;
+
+	if (attempt_to_freeze())
+		return 1;
+
+	if (!extra_pd1_pages_allowance)
+		get_extra_pd1_allowance();
+
+	storage_available = suspendActiveAllocator->storage_available();
+
+	if (!storage_available) {
+		printk(KERN_ERR "You need some storage available to be able to suspend.\n");
+		set_result_state(SUSPEND_ABORTED);
+		set_result_state(SUSPEND_NOSTORAGE_AVAILABLE);
+		return 1;
+	}
+
+	do {
+		suspend_prepare_status(CLEAR_BAR, "Preparing Image. Try %d.", tries);
+	
+		eat_memory();
+
+		if (test_result_state(SUSPEND_ABORTED))
+			break;
+
+		update_image();
+
+		tries++;
+
+	} while (image_not_ready(1) && tries <= MAX_TRIES &&
+			!test_result_state(SUSPEND_ABORTED));
+
+	result = image_not_ready(0);
+
+	if (!test_result_state(SUSPEND_ABORTED)) {
+		if (result) {
+			display_stats(1, 0);
+			abort_suspend(SUSPEND_UNABLE_TO_PREPARE_IMAGE,
+				"Unable to successfully prepare the image.\n");
+		} else {
+			unlink_lru_lists();
+			suspend_cond_pause(1, "Image preparation complete.");
+		}
+	}
+
+	return result;
+}
+
+#ifdef CONFIG_SUSPEND2_EXPORTS
+EXPORT_SYMBOL_GPL(real_nr_free_pages);
+#endif
diff --git a/kernel/power/prepare_image.h b/kernel/power/prepare_image.h
new file mode 100644
index 0000000..8c2e426
--- /dev/null
+++ b/kernel/power/prepare_image.h
@@ -0,0 +1,34 @@
+/*
+ * kernel/power/prepare_image.h
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ */
+
+#include <asm/sections.h>
+
+extern int suspend_prepare_image(void);
+extern void suspend_recalculate_image_contents(int storage_available);
+extern int real_nr_free_pages(unsigned long zone_idx_mask);
+extern int image_size_limit;
+extern void suspend_free_extra_pagedir_memory(void);
+extern int extra_pd1_pages_allowance;
+
+#define MIN_FREE_RAM 100
+#define MIN_EXTRA_PAGES_ALLOWANCE 500
+
+#define all_zones_mask ((unsigned long) ((1 << MAX_NR_ZONES) - 1))
+#ifdef CONFIG_HIGHMEM
+#define real_nr_free_high_pages() (real_nr_free_pages(1 << ZONE_HIGHMEM))
+#define real_nr_free_low_pages() (real_nr_free_pages(all_zones_mask - \
+						(1 << ZONE_HIGHMEM)))
+#else
+#define real_nr_free_high_pages() (0)
+#define real_nr_free_low_pages() (real_nr_free_pages(all_zones_mask))
+
+/* For eat_memory function */
+#define ZONE_HIGHMEM (MAX_NR_ZONES + 1)
+#endif
+
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 6d566bf..90a4cc5 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -15,6 +15,8 @@
 #include <linux/syscalls.h>
 #include <linux/freezer.h>
 
+int freezer_state = 0;
+
 /* 
  * Timeout for stopping processes
  */
@@ -179,10 +181,11 @@ int freeze_processes(void)
 		return nr_unfrozen;
 
 	sys_sync();
+	freezer_state = FREEZER_USERSPACE_FROZEN;
 	nr_unfrozen = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
 	if (nr_unfrozen)
 		return nr_unfrozen;
-
+	freezer_state = FREEZER_FULLY_ON;
 	printk("done.\n");
 	BUG_ON(in_atomic());
 	return 0;
@@ -200,7 +203,7 @@ static void thaw_tasks(int thaw_user_space)
 		if (is_user_space(p) == !thaw_user_space)
 			continue;
 
-		if (!thaw_process(p))
+		if (!thaw_process(p) && p->state != TASK_TRACED)
 			printk(KERN_WARNING " Strange, %s not stopped\n",
 				p->comm );
 	} while_each_thread(g, p);
@@ -209,11 +212,31 @@ static void thaw_tasks(int thaw_user_space)
 
 void thaw_processes(void)
 {
+	int old_state = freezer_state;
+
+	if (old_state == FREEZER_OFF)
+		return;
+
+	/* 
+	 * Change state beforehand because thawed tasks might submit I/O
+	 * immediately.
+	 */
+	freezer_state = FREEZER_OFF;
+
 	printk("Restarting tasks ... ");
-	thaw_tasks(FREEZER_KERNEL_THREADS);
+
+	if (old_state == FREEZER_FULLY_ON)
+		thaw_tasks(FREEZER_KERNEL_THREADS);
 	thaw_tasks(FREEZER_USER_SPACE);
 	schedule();
 	printk("done.\n");
 }
 
+void thaw_kernel_threads(void)
+{
+	freezer_state = FREEZER_USERSPACE_FROZEN;
+	thaw_tasks(FREEZER_KERNEL_THREADS);
+}
+
 EXPORT_SYMBOL(refrigerator);
+EXPORT_SYMBOL(freezer_state);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index fc53ad0..319c96a 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -33,6 +33,7 @@
 #include <asm/io.h>
 
 #include "power.h"
+#include "suspend2_builtin.h"
 
 /* List of PBEs needed for restoring the pages that were allocated before
  * the suspend and included in the suspend image, but have also been
@@ -40,6 +41,13 @@
  * directly to their "original" page frames.
  */
 struct pbe *restore_pblist;
+int resume_attempted;
+EXPORT_SYMBOL_GPL(resume_attempted);
+
+#ifdef CONFIG_SUSPEND2
+#include "pagedir.h"
+int suspend_post_context_save(void);
+#endif
 
 /* Pointer to an auxiliary buffer (1 page) */
 static void *buffer;
@@ -82,6 +90,11 @@ static void *get_image_page(gfp_t gfp_mask, int safe_needed)
 
 unsigned long get_safe_page(gfp_t gfp_mask)
 {
+#ifdef CONFIG_SUSPEND2
+	if (suspend2_running)
+		return suspend_get_nonconflicting_page();
+#endif
+
 	return (unsigned long)get_image_page(gfp_mask, PG_SAFE);
 }
 
@@ -604,7 +617,7 @@ static unsigned int count_free_highmem_pages(void)
  *	and it isn't a part of a free chunk of pages.
  */
 
-static struct page *saveable_highmem_page(unsigned long pfn)
+struct page *saveable_highmem_page(unsigned long pfn)
 {
 	struct page *page;
 
@@ -646,7 +659,6 @@ unsigned int count_highmem_pages(void)
 	return n;
 }
 #else
-static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
 static inline unsigned int count_highmem_pages(void) { return 0; }
 #endif /* CONFIG_HIGHMEM */
 
@@ -670,7 +682,7 @@ static inline int pfn_is_nosave(unsigned long pfn)
  *	a free chunk of pages.
  */
 
-static struct page *saveable_page(unsigned long pfn)
+struct page *saveable_page(unsigned long pfn)
 {
 	struct page *page;
 
@@ -986,6 +998,11 @@ asmlinkage int swsusp_save(void)
 {
 	unsigned int nr_pages, nr_highmem;
 
+#ifdef CONFIG_SUSPEND2
+	if (suspend2_running)
+		return suspend_post_context_save();
+#endif
+
 	printk("swsusp: critical section: \n");
 
 	drain_local_pages();
diff --git a/kernel/power/storage.c b/kernel/power/storage.c
new file mode 100644
index 0000000..702c1d4
--- /dev/null
+++ b/kernel/power/storage.c
@@ -0,0 +1,288 @@
+/*
+ * kernel/power/storage.c
+ *
+ * Copyright (C) 2005-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for talking to a userspace program that manages storage.
+ *
+ * The kernel side:
+ * - starts the userspace program;
+ * - sends messages telling it when to open and close the connection;
+ * - tells it when to quit;
+ *
+ * The user space side:
+ * - passes messages regarding status;
+ *
+ */
+
+#include <linux/suspend.h>
+#include <linux/freezer.h>
+ 
+#include "sysfs.h"
+#include "modules.h"
+#include "netlink.h"
+#include "storage.h"
+#include "ui.h"
+
+static struct user_helper_data usm_helper_data;
+static struct suspend_module_ops usm_ops;
+static int message_received = 0;
+static int usm_prepare_count = 0;
+static int storage_manager_last_action = 0;
+static int storage_manager_action = 0;
+       
+static int usm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	int type;
+	int *data;
+
+	type = nlh->nlmsg_type;
+
+	/* A control message: ignore them */
+	if (type < NETLINK_MSG_BASE)
+		return 0;
+
+	/* Unknown message: reply with EINVAL */
+	if (type >= USM_MSG_MAX)
+		return -EINVAL;
+
+	/* All operations require privileges, even GET */
+	if (security_netlink_recv(skb, CAP_NET_ADMIN))
+		return -EPERM;
+
+	/* Only allow one task to receive NOFREEZE privileges */
+	if (type == NETLINK_MSG_NOFREEZE_ME && usm_helper_data.pid != -1)
+		return -EBUSY;
+
+	data = (int*)NLMSG_DATA(nlh);
+
+	switch (type) {
+		case USM_MSG_SUCCESS:
+		case USM_MSG_FAILED:
+			message_received = type;
+			complete(&usm_helper_data.wait_for_process);
+			break;
+		default:
+			printk("Storage manager doesn't recognise message %d.\n", type);
+	}
+
+	return 1;
+}
+
+#ifdef CONFIG_NET
+static int activations = 0;
+
+int suspend_activate_storage(int force)
+{
+	int tries = 1;
+
+	if (usm_helper_data.pid == -1 || !usm_ops.enabled)
+		return 0;
+
+	message_received = 0;
+	activations++;
+
+	if (activations > 1 && !force)
+		return 0;
+
+	while ((!message_received || message_received == USM_MSG_FAILED) && tries < 2) {
+		suspend_prepare_status(DONT_CLEAR_BAR, "Activate storage attempt %d.\n", tries);
+
+		init_completion(&usm_helper_data.wait_for_process);
+
+		suspend_send_netlink_message(&usm_helper_data,
+			USM_MSG_CONNECT,
+			NULL, 0);
+
+		/* Wait 2 seconds for the userspace process to make contact */
+		wait_for_completion_timeout(&usm_helper_data.wait_for_process, 2*HZ);
+
+		tries++;
+	}
+
+	return 0;
+}
+
+int suspend_deactivate_storage(int force)
+{
+	if (usm_helper_data.pid == -1 || !usm_ops.enabled)
+		return 0;
+	
+	message_received = 0;
+	activations--;
+
+	if (activations && !force)
+		return 0;
+
+	init_completion(&usm_helper_data.wait_for_process);
+
+	suspend_send_netlink_message(&usm_helper_data,
+			USM_MSG_DISCONNECT,
+			NULL, 0);
+
+	wait_for_completion_timeout(&usm_helper_data.wait_for_process, 2*HZ);
+
+	if (!message_received || message_received == USM_MSG_FAILED) {
+		printk("Returning failure disconnecting storage.\n");
+		return 1;
+	}
+
+	return 0;
+}
+#endif
+
+static void storage_manager_simulate(void)
+{
+	printk("--- Storage manager simulate ---\n");
+	suspend_prepare_usm();
+	schedule();
+	printk("--- Activate storage 1 ---\n");
+	suspend_activate_storage(1);
+	schedule();
+	printk("--- Deactivate storage 1 ---\n");
+	suspend_deactivate_storage(1);
+	schedule();
+	printk("--- Cleanup usm ---\n");
+	suspend_cleanup_usm();
+	schedule();
+	printk("--- Storage manager simulate ends ---\n");
+}
+
+static int usm_storage_needed(void)
+{
+	return strlen(usm_helper_data.program);
+}
+
+static int usm_save_config_info(char *buf)
+{
+	int len = strlen(usm_helper_data.program);
+	memcpy(buf, usm_helper_data.program, len);
+	return len;
+}
+
+static void usm_load_config_info(char *buf, int size)
+{
+	/* Don't load the saved path if one has already been set */
+	if (usm_helper_data.program[0])
+		return;
+
+	memcpy(usm_helper_data.program, buf, size);
+}
+
+static int usm_memory_needed(void)
+{
+	/* ball park figure of 32 pages */
+	return (32 * PAGE_SIZE);
+}
+
+/* suspend_prepare_usm
+ */
+int suspend_prepare_usm(void)
+{
+	usm_prepare_count++;
+
+	if (usm_prepare_count > 1 || !usm_ops.enabled)
+		return 0;
+	
+	usm_helper_data.pid = -1;
+
+	if (!*usm_helper_data.program)
+		return 0;
+
+	suspend_netlink_setup(&usm_helper_data);
+
+	if (usm_helper_data.pid == -1)
+		printk("Suspend2 Storage Manager wanted, but couldn't start it.\n");
+
+	suspend_activate_storage(0);
+
+	return (usm_helper_data.pid != -1);
+}
+
+void suspend_cleanup_usm(void)
+{
+	usm_prepare_count--;
+
+	if (usm_helper_data.pid > -1 && !usm_prepare_count) {
+		suspend_deactivate_storage(0);
+		suspend_netlink_close(&usm_helper_data);
+	}
+}
+
+static void storage_manager_activate(void)
+{
+	if (storage_manager_action == storage_manager_last_action)
+		return;
+
+	if (storage_manager_action)
+		suspend_prepare_usm();
+	else
+		suspend_cleanup_usm();
+
+	storage_manager_last_action = storage_manager_action;
+}
+
+/*
+ * User interface specific /sys/power/suspend2 entries.
+ */
+
+static struct suspend_sysfs_data sysfs_params[] = {
+	{ SUSPEND2_ATTR("simulate_atomic_copy", SYSFS_RW),
+	  .type				= SUSPEND_SYSFS_DATA_NONE,
+	  .write_side_effect		= storage_manager_simulate,
+	},
+
+	{ SUSPEND2_ATTR("enabled", SYSFS_RW),
+	  SYSFS_INT(&usm_ops.enabled, 0, 1, 0)
+	},
+
+	{ SUSPEND2_ATTR("program", SYSFS_RW),
+	  SYSFS_STRING(usm_helper_data.program, 254, 0)
+	},
+
+	{ SUSPEND2_ATTR("activate_storage", SYSFS_RW),
+	  SYSFS_INT(&storage_manager_action, 0, 1, 0),
+	  .write_side_effect		= storage_manager_activate,
+	}
+};
+
+static struct suspend_module_ops usm_ops = {
+	.type				= MISC_MODULE,
+	.name				= "Userspace Storage Manager",
+	.directory			= "storage_manager",
+	.module				= THIS_MODULE,
+	.storage_needed			= usm_storage_needed,
+	.save_config_info		= usm_save_config_info,
+	.load_config_info		= usm_load_config_info,
+	.memory_needed			= usm_memory_needed,
+
+	.sysfs_data			= sysfs_params,
+	.num_sysfs_entries		= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+/* suspend_usm_sysfs_init
+ * Description: Boot time initialisation for user interface.
+ */
+int s2_usm_init(void)
+{
+	usm_helper_data.nl = NULL;
+	usm_helper_data.program[0] = '\0';
+	usm_helper_data.pid = -1;
+	usm_helper_data.skb_size = 0;
+	usm_helper_data.pool_limit = 6;
+	usm_helper_data.netlink_id = NETLINK_SUSPEND2_USM;
+	usm_helper_data.name = "userspace storage manager";
+	usm_helper_data.rcv_msg = usm_user_rcv_msg;
+	usm_helper_data.interface_version = 1;
+	usm_helper_data.must_init = 0;
+	init_completion(&usm_helper_data.wait_for_process);
+
+	return suspend_register_module(&usm_ops);
+}
+
+void s2_usm_exit(void)
+{
+	suspend_unregister_module(&usm_ops);
+}
diff --git a/kernel/power/storage.h b/kernel/power/storage.h
new file mode 100644
index 0000000..e05eeef
--- /dev/null
+++ b/kernel/power/storage.h
@@ -0,0 +1,53 @@
+/*
+ * kernel/power/storage.h
+ *
+ * Copyright (C) 2005-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifdef CONFIG_NET
+int suspend_prepare_usm(void);
+void suspend_cleanup_usm(void);
+
+int suspend_activate_storage(int force);
+int suspend_deactivate_storage(int force);
+extern int s2_usm_init(void);
+extern void s2_usm_exit(void);
+#else
+static inline int s2_usm_init(void) { return 0; }
+static inline void s2_usm_exit(void) { }
+
+static inline int suspend_activate_storage(int force)
+{
+	return 0;
+}
+
+static inline int suspend_deactivate_storage(int force)
+{
+	return 0;
+}
+
+static inline int suspend_prepare_usm(void) { return 0; }
+static inline void suspend_cleanup_usm(void) { }
+#endif
+
+enum {
+	USM_MSG_BASE = 0x10,
+
+	/* Kernel -> Userspace */
+	USM_MSG_CONNECT = 0x30,
+	USM_MSG_DISCONNECT = 0x31,
+	USM_MSG_SUCCESS = 0x40,
+	USM_MSG_FAILED = 0x41,
+
+	USM_MSG_MAX,
+};
+
+#ifdef CONFIG_NET
+extern __init int suspend_usm_init(void);
+extern __exit void suspend_usm_cleanup(void);
+#else
+#define suspend_usm_init() do { } while(0)
+#define suspend_usb_cleanup() do { } while(0)
+#endif
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
new file mode 100644
index 0000000..3de56ac
--- /dev/null
+++ b/kernel/power/suspend.c
@@ -0,0 +1,1022 @@
+/*
+ * kernel/power/suspend.c
+ */
+/** \mainpage Suspend2.
+ *
+ * Suspend2 provides support for saving and restoring an image of
+ * system memory to an arbitrary storage device, either on the local computer,
+ * or across some network. The support is entirely OS based, so Suspend2 
+ * works without requiring BIOS, APM or ACPI support. The vast majority of the
+ * code is also architecture independant, so it should be very easy to port
+ * the code to new architectures. Suspend includes support for SMP, 4G HighMem
+ * and preemption. Initramfses and initrds are also supported.
+ *
+ * Suspend2 uses a modular design, in which the method of storing the image is
+ * completely abstracted from the core code, as are transformations on the data
+ * such as compression and/or encryption (multiple 'modules' can be used to
+ * provide arbitrary combinations of functionality). The user interface is also
+ * modular, so that arbitrarily simple or complex interfaces can be used to
+ * provide anything from debugging information through to eye candy.
+ * 
+ * \section Copyright
+ *
+ * Suspend2 is released under the GPLv2.
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu><BR>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz><BR>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr><BR>
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net)<BR>
+ *
+ * \section Credits
+ * 
+ * Nigel would like to thank the following people for their work:
+ * 
+ * Bernard Blackham <bernard@blackham.com.au><BR>
+ * Web page & Wiki administration, some coding. A person without whom
+ * Suspend would not be where it is.
+ *
+ * Michael Frank <mhf@linuxmail.org><BR>
+ * Extensive testing and help with improving stability. I was constantly
+ * amazed by the quality and quantity of Michael's help.
+ *
+ * Pavel Machek <pavel@ucw.cz><BR>
+ * Modifications, defectiveness pointing, being with Gabor at the very beginning,
+ * suspend to swap space, stop all tasks. Port to 2.4.18-ac and 2.5.17. Even
+ * though Pavel and I disagree on the direction suspend to disk should take, I
+ * appreciate the valuable work he did in helping Gabor get the concept working.
+ *
+ * ..and of course the myriads of Suspend2 users who have helped diagnose
+ * and fix bugs, made suggestions on how to improve the code, proofread
+ * documentation, and donated time and money.
+ *
+ * Thanks also to corporate sponsors:
+ *
+ * <B>Redhat.</B>Sometime employer from May 2006 (my fault, not Redhat's!).
+ *
+ * <B>Cyclades.com.</B> Nigel's employers from Dec 2004 until May 2006, who
+ * allowed him to work on Suspend and PM related issues on company time.
+ * 
+ * <B>LinuxFund.org.</B> Sponsored Nigel's work on Suspend for four months Oct 2003
+ * to Jan 2004.
+ *
+ * <B>LAC Linux.</B> Donated P4 hardware that enabled development and ongoing
+ * maintenance of SMP and Highmem support.
+ *
+ * <B>OSDL.</B> Provided access to various hardware configurations, make occasional
+ * small donations to the project.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/freezer.h>
+#include <linux/utsrelease.h>
+#include <linux/cpu.h>
+#include <linux/console.h>
+#include <asm/uaccess.h>
+
+#include "modules.h"
+#include "sysfs.h"
+#include "prepare_image.h"
+#include "io.h"
+#include "ui.h"
+#include "power_off.h"
+#include "storage.h"
+#include "checksum.h"
+#include "cluster.h"
+#include "suspend2_builtin.h"
+
+/*! Pageset metadata. */
+struct pagedir pagedir2 = {2}; 
+
+static int get_pmsem = 0, got_pmsem;
+static mm_segment_t oldfs;
+static atomic_t actions_running;
+static int block_dump_save;
+extern int block_dump;
+
+int do_suspend2_step(int step);
+
+/*
+ * Basic clean-up routine.
+ */
+void suspend_finish_anything(int suspend_or_resume)
+{
+	if (!atomic_dec_and_test(&actions_running))
+		return;
+
+	suspend_cleanup_modules(suspend_or_resume);
+	suspend_put_modules();
+	clear_suspend_state(SUSPEND_RUNNING);
+	set_fs(oldfs);
+	if (suspend_or_resume) {
+		block_dump = block_dump_save;
+		set_cpus_allowed(current, CPU_MASK_ALL);
+	}
+}
+
+/*
+ * Basic set-up routine.
+ */
+int suspend_start_anything(int suspend_or_resume)
+{
+	if (atomic_add_return(1, &actions_running) != 1) {
+		if (suspend_or_resume) {
+			printk("Can't start a cycle when actions are "
+					"already running.\n");
+			atomic_dec(&actions_running);
+			return -EBUSY;
+		} else
+			return 0;
+	}
+
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+
+	if (!suspendActiveAllocator) {
+		/* Be quiet if we're not trying to suspend or resume */ 
+		if (suspend_or_resume)
+			printk("No storage allocator is currently active. "
+					"Rechecking whether we can use one.\n");
+		suspend_attempt_to_parse_resume_device(!suspend_or_resume);
+	}
+
+	set_suspend_state(SUSPEND_RUNNING);
+
+	if (suspend_get_modules()) {
+		printk("Suspend2: Get modules failed!\n");
+		goto out_err;
+	}
+
+	if (suspend_initialise_modules(suspend_or_resume)) {
+		printk("Suspend2: Initialise modules failed!\n");
+		goto out_err;
+	}
+
+	if (suspend_or_resume) {
+		block_dump_save = block_dump;
+		block_dump = 0;
+		set_cpus_allowed(current, CPU_MASK_CPU0);
+	}
+
+	return 0;
+
+out_err:
+	if (suspend_or_resume)
+		block_dump_save = block_dump;
+	suspend_finish_anything(suspend_or_resume);
+	return -EBUSY;
+}
+
+/*
+ * Allocate & free bitmaps.
+ */
+static int allocate_bitmaps(void)
+{
+	if (allocate_dyn_pageflags(&pageset1_map) ||
+	    allocate_dyn_pageflags(&pageset1_copy_map) ||
+	    allocate_dyn_pageflags(&pageset2_map) ||
+	    allocate_dyn_pageflags(&io_map) ||
+	    allocate_dyn_pageflags(&page_resave_map))
+		return 1;
+
+	return 0;
+}
+
+static void free_bitmaps(void)
+{
+	free_dyn_pageflags(&pageset1_map);
+	free_dyn_pageflags(&pageset1_copy_map);
+	free_dyn_pageflags(&pageset2_map);
+	free_dyn_pageflags(&io_map);
+	free_dyn_pageflags(&page_resave_map);
+}
+
+static int io_MB_per_second(int read_write)
+{
+	return (suspend_io_time[read_write][1]) ?
+		MB((unsigned long) suspend_io_time[read_write][0]) * HZ /
+		suspend_io_time[read_write][1] : 0;
+}
+
+/* get_debug_info
+ * Functionality:	Store debug info in a buffer.
+ */
+#define SNPRINTF(a...) 	len += snprintf_used(((char *)buffer) + len, \
+		count - len - 1, ## a)
+static int get_suspend_debug_info(const char *buffer, int count)
+{
+	int len = 0;
+
+	SNPRINTF("Suspend2 debugging info:\n");
+	SNPRINTF("- Suspend core   : %s\n", SUSPEND_CORE_VERSION);
+	SNPRINTF("- Kernel Version : %s\n", UTS_RELEASE);
+	SNPRINTF("- Compiler vers. : %d.%d\n", __GNUC__, __GNUC_MINOR__);
+	SNPRINTF("- Attempt number : %d\n", nr_suspends);
+	SNPRINTF("- Parameters     : %ld %ld %ld %d %d %ld\n",
+			suspend_result,
+			suspend_action,
+			suspend_debug_state,
+			suspend_default_console_level,
+			image_size_limit,
+			suspend2_poweroff_method);
+	SNPRINTF("- Overall expected compression percentage: %d.\n",
+			100 - suspend_expected_compression_ratio());
+	len+= suspend_print_module_debug_info(((char *) buffer) + len, 
+			count - len - 1);
+	if (suspend_io_time[0][1]) {
+		if ((io_MB_per_second(0) < 5) || (io_MB_per_second(1) < 5)) {
+			SNPRINTF("- I/O speed: Write %d KB/s",
+			  (KB((unsigned long) suspend_io_time[0][0]) * HZ /
+			  suspend_io_time[0][1]));
+			if (suspend_io_time[1][1])
+				SNPRINTF(", Read %d KB/s",
+				  (KB((unsigned long) suspend_io_time[1][0]) * HZ /
+				  suspend_io_time[1][1]));
+		} else {
+			SNPRINTF("- I/O speed: Write %d MB/s",
+			 (MB((unsigned long) suspend_io_time[0][0]) * HZ /
+			  suspend_io_time[0][1]));
+			if (suspend_io_time[1][1])
+				SNPRINTF(", Read %d MB/s",
+				 (MB((unsigned long) suspend_io_time[1][0]) * HZ /
+				  suspend_io_time[1][1]));
+		}
+		SNPRINTF(".\n");
+	}
+	else
+		SNPRINTF("- No I/O speed stats available.\n");
+	SNPRINTF("- Extra pages    : %d used/%d.\n",
+			extra_pd1_pages_used, extra_pd1_pages_allowance);
+
+	return len;
+}
+
+/*
+ * do_cleanup
+ */
+
+static void do_cleanup(int get_debug_info)
+{
+	int i = 0;
+	char *buffer = NULL;
+
+	if (get_debug_info)
+		suspend_prepare_status(DONT_CLEAR_BAR, "Cleaning up...");
+	relink_lru_lists();
+
+	free_checksum_pages();
+
+	if (get_debug_info)
+		buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+
+	if (buffer)
+		i = get_suspend_debug_info(buffer, PAGE_SIZE);
+
+	suspend_free_extra_pagedir_memory();
+	
+	pagedir1.size = pagedir2.size = 0;
+	set_highmem_size(pagedir1, 0);
+	set_highmem_size(pagedir2, 0);
+
+	restore_avenrun();
+
+	thaw_processes();
+
+#ifdef CONFIG_SUSPEND2_KEEP_IMAGE
+	if (test_action_state(SUSPEND_KEEP_IMAGE) &&
+	    !test_result_state(SUSPEND_ABORTED)) {
+		suspend_message(SUSPEND_ANY_SECTION, SUSPEND_LOW, 1,
+			"Suspend2: Not invalidating the image due "
+			"to Keep Image being enabled.\n");
+		set_result_state(SUSPEND_KEPT_IMAGE);
+	} else
+#endif
+		if (suspendActiveAllocator)
+			suspendActiveAllocator->invalidate_image();
+
+	free_bitmaps();
+
+	if (buffer && i) {
+		/* Printk can only handle 1023 bytes, including
+		 * its level mangling. */
+		for (i = 0; i < 3; i++)
+			printk("%s", buffer + (1023 * i));
+		free_page((unsigned long) buffer);
+	}
+
+	if (!test_action_state(SUSPEND_LATE_CPU_HOTPLUG))
+		enable_nonboot_cpus();
+	suspend_cleanup_console();
+
+	suspend_deactivate_storage(0);
+
+	clear_suspend_state(SUSPEND_IGNORE_LOGLEVEL);
+	clear_suspend_state(SUSPEND_TRYING_TO_RESUME);
+	clear_suspend_state(SUSPEND_NOW_RESUMING);
+
+	if (got_pmsem) {
+		mutex_unlock(&pm_mutex);
+		got_pmsem = 0;
+	}
+}
+
+static int check_still_keeping_image(void)
+{
+	if (test_action_state(SUSPEND_KEEP_IMAGE)) {
+		printk("Image already stored: powering down immediately.");
+		do_suspend2_step(STEP_SUSPEND_POWERDOWN);
+		return 1;	/* Just in case we're using S3 */
+	}
+
+	printk("Invalidating previous image.\n");
+	suspendActiveAllocator->invalidate_image();
+
+	return 0;
+}
+
+static int suspend_init(void)
+{
+	suspend_result = 0;
+
+	printk(KERN_INFO "Suspend2: Initiating a software suspend cycle.\n");
+
+	nr_suspends++;
+	
+	save_avenrun();
+	
+	suspend_io_time[0][0] = suspend_io_time[0][1] = 
+		suspend_io_time[1][0] =	suspend_io_time[1][1] = 0;
+
+	if (!test_suspend_state(SUSPEND_CAN_SUSPEND) ||
+	    allocate_bitmaps())
+		return 0;
+	
+	suspend_prepare_console();
+	if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG) ||
+			!disable_nonboot_cpus())
+		return 1;
+
+	set_result_state(SUSPEND_CPU_HOTPLUG_FAILED);
+	set_result_state(SUSPEND_ABORTED);
+	return 0;
+}
+
+static int can_suspend(void)
+{
+	if (get_pmsem) {
+		if (!mutex_trylock(&pm_mutex)) {
+			printk("Suspend2: Failed to obtain pm_mutex.\n");
+			dump_stack();
+			set_result_state(SUSPEND_ABORTED);
+			set_result_state(SUSPEND_PM_SEM);
+			return 0;
+		}
+		got_pmsem = 1;
+	}
+
+	if (!test_suspend_state(SUSPEND_CAN_SUSPEND))
+		suspend_attempt_to_parse_resume_device(0);
+
+	if (!test_suspend_state(SUSPEND_CAN_SUSPEND)) {
+		printk("Suspend2: Software suspend is disabled.\n"
+			"This may be because you haven't put something along "
+			"the lines of\n\nresume2=swap:/dev/hda1\n\n"
+			"in lilo.conf or equivalent. (Where /dev/hda1 is your "
+			"swap partition).\n");
+		set_result_state(SUSPEND_ABORTED);
+		if (!got_pmsem) {
+			mutex_unlock(&pm_mutex);
+			got_pmsem = 0;
+		}
+		return 0;
+	}
+	
+	return 1;
+}
+
+static int do_power_down(void)
+{
+	/* If switching images fails, do normal powerdown */
+	if (poweroff_resume2[0])
+		do_suspend2_step(STEP_RESUME_ALT_IMAGE);
+
+	suspend_cond_pause(1, "About to power down or reboot.");
+	suspend2_power_down();
+
+	/* If we return, it's because we suspended to ram */
+	if (read_pageset2(1))
+		panic("Attempt to reload pagedir 2 failed. Try rebooting.");
+
+	barrier();
+	mb();
+	do_cleanup(1);
+	return 0;
+}
+
+/*
+ * __save_image
+ * Functionality    : High level routine which performs the steps necessary
+ *                    to save the image after preparatory steps have been taken.
+ * Key Assumptions  : Processes frozen, sufficient memory available, drivers
+ *                    suspended.
+ */
+static int __save_image(void)
+{
+	int temp_result;
+
+	suspend_prepare_status(DONT_CLEAR_BAR, "Starting to save the image..");
+
+	suspend_message(SUSPEND_ANY_SECTION, SUSPEND_LOW, 1,
+		" - Final values: %d and %d.\n",
+		pagedir1.size, pagedir2.size);
+
+	suspend_cond_pause(1, "About to write pagedir2.");
+
+	calculate_check_checksums(0);
+
+	temp_result = write_pageset(&pagedir2);
+	
+	if (temp_result == -1 || test_result_state(SUSPEND_ABORTED))
+		return 1;
+
+	suspend_cond_pause(1, "About to copy pageset 1.");
+
+	if (test_result_state(SUSPEND_ABORTED))
+		return 1;
+
+	suspend_deactivate_storage(1);
+
+	suspend_prepare_status(DONT_CLEAR_BAR, "Doing atomic copy.");
+	
+	suspend2_in_suspend = 1;
+	
+	suspend_console();
+	if (device_suspend(PMSG_FREEZE)) {
+		set_result_state(SUSPEND_DEVICE_REFUSED);
+		set_result_state(SUSPEND_ABORTED);
+		goto ResumeConsole;
+	}
+	
+	if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG) &&
+			disable_nonboot_cpus()) {
+		set_result_state(SUSPEND_CPU_HOTPLUG_FAILED);
+		set_result_state(SUSPEND_ABORTED);
+	} else
+		temp_result = suspend2_suspend();
+
+	/* We return here at resume time too! */
+	if (!suspend2_in_suspend && pm_ops && pm_ops->finish &&
+			suspend2_poweroff_method > 3)
+		pm_ops->finish(suspend2_poweroff_method);
+
+	if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG))
+		enable_nonboot_cpus();
+
+	device_resume();
+
+ResumeConsole:
+	resume_console();
+
+	if (suspend_activate_storage(1))
+		panic("Failed to reactivate our storage.");
+	
+	if (temp_result || test_result_state(SUSPEND_ABORTED))
+		return 1;
+	
+	/* Resume time? */
+	if (!suspend2_in_suspend) {
+		copyback_post();
+		return 0;
+	}
+
+	/* Nope. Suspending. So, see if we can save the image... */
+
+	suspend_update_status(pagedir2.size,
+			pagedir1.size + pagedir2.size,
+			NULL);
+	
+	if (test_result_state(SUSPEND_ABORTED))
+		goto abort_reloading_pagedir_two;
+
+	suspend_cond_pause(1, "About to write pageset1.");
+
+	suspend_message(SUSPEND_ANY_SECTION, SUSPEND_LOW, 1,
+			"-- Writing pageset1\n");
+
+	temp_result = write_pageset(&pagedir1);
+
+	/* We didn't overwrite any memory, so no reread needs to be done. */
+	if (test_action_state(SUSPEND_TEST_FILTER_SPEED))
+		return 1;
+
+	if (temp_result == 1 || test_result_state(SUSPEND_ABORTED))
+		goto abort_reloading_pagedir_two;
+
+	suspend_cond_pause(1, "About to write header.");
+
+	if (test_result_state(SUSPEND_ABORTED))
+		goto abort_reloading_pagedir_two;
+
+	temp_result = write_image_header();
+
+	if (test_action_state(SUSPEND_TEST_BIO))
+		return 1;
+
+	if (!temp_result && !test_result_state(SUSPEND_ABORTED))
+		return 0;
+
+abort_reloading_pagedir_two:
+	temp_result = read_pageset2(1);
+
+	/* If that failed, we're sunk. Panic! */
+	if (temp_result)
+		panic("Attempt to reload pagedir 2 while aborting "
+				"a suspend failed.");
+
+	return 1;
+}
+
+/* 
+ * do_save_image
+ *
+ * Save the prepared image.
+ */
+
+static int do_save_image(void)
+{
+	int result = __save_image();
+	if (!suspend2_in_suspend || result)
+		do_cleanup(1);
+	return result;
+}
+
+
+/* do_prepare_image
+ *
+ * Seek to initialise and prepare an image to be saved. On failure,
+ * cleanup.
+ */
+
+static int do_prepare_image(void)
+{
+	if (suspend_activate_storage(0))
+		return 1;
+
+	/*
+	 * If kept image and still keeping image and suspending to RAM, we will 
+	 * return 1 after suspending and resuming (provided the power doesn't
+	 * run out.
+	 */
+
+	if (!can_suspend() ||
+	    (test_result_state(SUSPEND_KEPT_IMAGE) &&
+	     check_still_keeping_image()))
+		goto cleanup;
+
+	if (suspend_init() && !suspend_prepare_image() &&
+			!test_result_state(SUSPEND_ABORTED))
+		return 0;
+
+cleanup:
+	do_cleanup(0);
+	return 1;
+}
+
+static int do_check_can_resume(void)
+{
+	char *buf = (char *) get_zeroed_page(GFP_KERNEL);
+	int result = 0;
+
+	if (!buf)
+		return 0;
+
+	/* Only interested in first byte, so throw away return code. */
+	image_exists_read(buf, PAGE_SIZE);
+
+	if (buf[0] == '1')
+		result = 1;
+
+	free_page((unsigned long) buf);
+	return result;
+}
+
+/*
+ * We check if we have an image and if so we try to resume.
+ */
+static int do_load_atomic_copy(void)
+{
+	int read_image_result = 0;
+
+	if (sizeof(swp_entry_t) != sizeof(long)) {
+		printk(KERN_WARNING "Suspend2: The size of swp_entry_t != size"
+			" of long. Please report this!\n");
+		return 1;
+	}
+	
+	if (!resume2_file[0])
+		printk(KERN_WARNING "Suspend2: "
+			"You need to use a resume2= command line parameter to "
+			"tell Suspend2 where to look for an image.\n");
+
+	suspend_activate_storage(0);
+
+	if (!(test_suspend_state(SUSPEND_RESUME_DEVICE_OK)) &&
+		!suspend_attempt_to_parse_resume_device(0)) {
+		/* 
+		 * Without a usable storage device we can do nothing - 
+		 * even if noresume is given
+		 */
+
+		if (!suspendNumAllocators)
+			printk(KERN_ALERT "Suspend2: "
+			  "No storage allocators have been registered.\n");
+		else
+			printk(KERN_ALERT "Suspend2: "
+				"Missing or invalid storage location "
+				"(resume2= parameter). Please correct and "
+				"rerun lilo (or equivalent) before "
+				"suspending.\n");
+		suspend_deactivate_storage(0);
+		return 1;
+	}
+
+	read_image_result = read_pageset1(); /* non fatal error ignored */
+
+	if (test_suspend_state(SUSPEND_NORESUME_SPECIFIED)) {
+		printk(KERN_WARNING "Suspend2: Resuming disabled as requested.\n");
+		clear_suspend_state(SUSPEND_NORESUME_SPECIFIED);
+	}
+
+	suspend_deactivate_storage(0);
+	
+	if (read_image_result)
+		return 1;
+
+	return 0;
+}
+
+static void prepare_restore_load_alt_image(int prepare)
+{
+	static dyn_pageflags_t pageset1_map_save, pageset1_copy_map_save;
+
+	if (prepare) {
+		pageset1_map_save = pageset1_map;
+		pageset1_map = NULL;
+		pageset1_copy_map_save = pageset1_copy_map;
+		pageset1_copy_map = NULL;
+		set_suspend_state(SUSPEND_LOADING_ALT_IMAGE);
+		suspend_reset_alt_image_pageset2_pfn();
+	} else {
+		if (pageset1_map)
+			free_dyn_pageflags(&pageset1_map);
+		pageset1_map = pageset1_map_save;
+		if (pageset1_copy_map)
+			free_dyn_pageflags(&pageset1_copy_map);
+		pageset1_copy_map = pageset1_copy_map_save;
+		clear_suspend_state(SUSPEND_NOW_RESUMING);
+		clear_suspend_state(SUSPEND_LOADING_ALT_IMAGE);
+	}
+}
+
+int pre_resume_freeze(void)
+{
+	if (!test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) {
+		suspend_prepare_status(DONT_CLEAR_BAR,	"Disable nonboot cpus.");
+		if (disable_nonboot_cpus()) {
+			set_result_state(SUSPEND_CPU_HOTPLUG_FAILED);
+			set_result_state(SUSPEND_ABORTED);
+			return 1;
+		}
+	}
+
+	suspend_prepare_status(DONT_CLEAR_BAR,	"Freeze processes.");
+
+	if (freeze_processes()) {
+		printk("Some processes failed to suspend\n");
+		return 1;
+	}
+
+	return 0;
+}
+
+void post_resume_thaw(void)
+{
+	thaw_processes();
+	if (!test_action_state(SUSPEND_LATE_CPU_HOTPLUG))
+		enable_nonboot_cpus();
+}
+
+int do_suspend2_step(int step)
+{
+	int result;
+
+	switch (step) {
+		case STEP_SUSPEND_PREPARE_IMAGE:
+			return do_prepare_image();
+		case STEP_SUSPEND_SAVE_IMAGE:
+			return do_save_image();
+		case STEP_SUSPEND_POWERDOWN:
+			return do_power_down();
+		case STEP_RESUME_CAN_RESUME:
+			return do_check_can_resume();
+		case STEP_RESUME_LOAD_PS1:
+			return do_load_atomic_copy();
+		case STEP_RESUME_DO_RESTORE:
+			/* 
+			 * If we succeed, this doesn't return.
+			 * Instead, we return from do_save_image() in the
+			 * suspended kernel.
+			 */
+			result = suspend_atomic_restore();
+			if (result)
+				post_resume_thaw();
+			return result;
+		case STEP_RESUME_ALT_IMAGE:
+			printk("Trying to resume alternate image.\n");
+			suspend2_in_suspend = 0;
+			save_restore_resume2(SAVE, NOQUIET);
+			prepare_restore_load_alt_image(1);
+			if (!do_check_can_resume()) {
+				printk("Nothing to resume from.\n");
+				goto out;
+			}
+			if (!do_load_atomic_copy()) {
+				printk("Failed to load image.\n");
+				suspend_atomic_restore();
+			}
+out:
+			prepare_restore_load_alt_image(0);
+			save_restore_resume2(RESTORE, NOQUIET);
+			break;
+	}
+
+	return 0;
+}
+
+/* -- Functions for kickstarting a suspend or resume --- */
+
+/*
+ * Check if we have an image and if so try to resume.
+ */
+void __suspend2_try_resume(void)
+{
+	set_suspend_state(SUSPEND_TRYING_TO_RESUME);
+	resume_attempted = 1;
+
+	if (do_suspend2_step(STEP_RESUME_CAN_RESUME) &&
+	    !do_suspend2_step(STEP_RESUME_LOAD_PS1))
+	    do_suspend2_step(STEP_RESUME_DO_RESTORE);
+
+	do_cleanup(0);
+
+	clear_suspend_state(SUSPEND_IGNORE_LOGLEVEL);
+	clear_suspend_state(SUSPEND_TRYING_TO_RESUME);
+	clear_suspend_state(SUSPEND_NOW_RESUMING);
+}
+
+/* Wrapper for when called from init/do_mounts.c */
+void _suspend2_try_resume(void)
+{
+	resume_attempted = 1;
+
+	if (suspend_start_anything(SYSFS_RESUMING))
+		return;
+
+	/* Unlock will be done in do_cleanup */
+	mutex_lock(&pm_mutex);
+	got_pmsem = 1;
+
+	__suspend2_try_resume();
+
+	/* 
+	 * For initramfs, we have to clear the boot time
+	 * flag after trying to resume
+	 */
+	clear_suspend_state(SUSPEND_BOOT_TIME);
+	suspend_finish_anything(SYSFS_RESUMING);
+}
+
+/*
+ * _suspend2_try_suspend
+ * Functionality   : 
+ * Called From     : drivers/acpi/sleep/main.c
+ *                   kernel/reboot.c
+ */
+int _suspend2_try_suspend(int have_pmsem)
+{
+	int result = 0, sys_power_disk = 0;
+
+	if (!atomic_read(&actions_running)) {
+		/* Came in via /sys/power/disk */
+		if (suspend_start_anything(SYSFS_SUSPENDING))
+			return -EBUSY;
+		sys_power_disk = 1;
+	}
+
+	get_pmsem = !have_pmsem;
+
+	if (strlen(poweroff_resume2)) {
+		attempt_to_parse_po_resume_device2();
+
+		if (!strlen(poweroff_resume2)) {
+			printk("Poweroff resume2 now invalid. Aborting.\n");
+			goto out;
+		}
+	}
+
+	if ((result = do_suspend2_step(STEP_SUSPEND_PREPARE_IMAGE)))
+		goto out;
+
+	if (test_action_state(SUSPEND_FREEZER_TEST)) {
+		do_cleanup(0);
+		goto out;
+	}
+
+	if ((result = do_suspend2_step(STEP_SUSPEND_SAVE_IMAGE)))
+		goto out;
+
+	/* This code runs at resume time too! */
+	if (suspend2_in_suspend)
+		result = do_suspend2_step(STEP_SUSPEND_POWERDOWN);
+out:
+	if (sys_power_disk)
+		suspend_finish_anything(SYSFS_SUSPENDING);
+	return result;
+}
+
+/*
+ * This array contains entries that are automatically registered at
+ * boot. Modules and the console code register their own entries separately.
+ */
+static struct suspend_sysfs_data sysfs_params[] = {
+	{ SUSPEND2_ATTR("extra_pages_allowance", SYSFS_RW),
+	  SYSFS_INT(&extra_pd1_pages_allowance, 0, INT_MAX, 0)
+	},
+
+	{ SUSPEND2_ATTR("image_exists", SYSFS_RW),
+	  SYSFS_CUSTOM(image_exists_read, image_exists_write,
+			  SYSFS_NEEDS_SM_FOR_BOTH)
+	},
+
+	{ SUSPEND2_ATTR("resume2", SYSFS_RW),
+	  SYSFS_STRING(resume2_file, 255, SYSFS_NEEDS_SM_FOR_WRITE),
+	  .write_side_effect = attempt_to_parse_resume_device2,
+	},
+
+	{ SUSPEND2_ATTR("poweroff_resume2", SYSFS_RW),
+	  SYSFS_STRING(poweroff_resume2, 255, SYSFS_NEEDS_SM_FOR_WRITE),
+	  .write_side_effect = attempt_to_parse_po_resume_device2,
+	},
+	{ SUSPEND2_ATTR("debug_info", SYSFS_READONLY),
+	  SYSFS_CUSTOM(get_suspend_debug_info, NULL, 0)
+	},
+	
+	{ SUSPEND2_ATTR("ignore_rootfs", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_IGNORE_ROOTFS, 0)
+	},
+	
+	{ SUSPEND2_ATTR("image_size_limit", SYSFS_RW),
+	  SYSFS_INT(&image_size_limit, -2, INT_MAX, 0)
+	},
+
+	{ SUSPEND2_ATTR("last_result", SYSFS_RW),
+	  SYSFS_UL(&suspend_result, 0, 0, 0)
+	},
+	
+	{ SUSPEND2_ATTR("no_multithreaded_io", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_NO_MULTITHREADED_IO, 0)
+	},
+
+	{ SUSPEND2_ATTR("full_pageset2", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_PAGESET2_FULL, 0)
+	},
+
+	{ SUSPEND2_ATTR("reboot", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_REBOOT, 0)
+	},
+
+#ifdef CONFIG_SOFTWARE_SUSPEND
+	{ SUSPEND2_ATTR("replace_swsusp", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_REPLACE_SWSUSP, 0)
+	},
+#endif
+
+	{ SUSPEND2_ATTR("resume_commandline", SYSFS_RW),
+	  SYSFS_STRING(suspend2_nosave_commandline, COMMAND_LINE_SIZE, 0)
+	},
+
+	{ SUSPEND2_ATTR("version", SYSFS_READONLY),
+	  SYSFS_STRING(SUSPEND_CORE_VERSION, 0, 0)
+	},
+
+	{ SUSPEND2_ATTR("no_load_direct", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_NO_DIRECT_LOAD, 0)
+	},
+
+	{ SUSPEND2_ATTR("freezer_test", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_FREEZER_TEST, 0)
+	},
+
+	{ SUSPEND2_ATTR("test_bio", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_TEST_BIO, 0)
+	},
+
+	{ SUSPEND2_ATTR("test_filter_speed", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_TEST_FILTER_SPEED, 0)
+	},
+
+	{ SUSPEND2_ATTR("slow", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_SLOW, 0)
+	},
+
+	{ SUSPEND2_ATTR("no_pageset2", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_NO_PAGESET2, 0)
+	},
+	  
+	{ SUSPEND2_ATTR("late_cpu_hotplug", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_LATE_CPU_HOTPLUG, 0)
+	},
+	  
+#if defined(CONFIG_ACPI)
+	{ SUSPEND2_ATTR("powerdown_method", SYSFS_RW),
+	  SYSFS_UL(&suspend2_poweroff_method, 0, 5, 0)
+	},
+#endif
+
+#ifdef CONFIG_SUSPEND2_KEEP_IMAGE
+	{ SUSPEND2_ATTR("keep_image", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_KEEP_IMAGE, 0)
+	},
+#endif
+};
+
+struct suspend2_core_fns my_fns = {
+	.get_nonconflicting_page = __suspend_get_nonconflicting_page,
+	.post_context_save = __suspend_post_context_save,
+	.try_suspend = _suspend2_try_suspend,
+	.try_resume = _suspend2_try_resume,
+};
+ 
+static __init int core_load(void)
+{
+	int i,
+	    numfiles = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data);
+
+	printk("Suspend v" SUSPEND_CORE_VERSION "\n");
+
+	if (s2_sysfs_init())
+		return 1;
+
+	for (i=0; i< numfiles; i++)
+		suspend_register_sysfs_file(&suspend2_subsys.kset.kobj,
+				&sysfs_params[i]);
+
+	s2_core_fns = &my_fns;
+
+	if (s2_checksum_init())
+		return 1;
+	if (s2_cluster_init())
+		return 1;
+	if (s2_usm_init())
+		return 1;
+	if (s2_ui_init())
+		return 1;
+
+#ifdef CONFIG_SOFTWARE_SUSPEND
+	/* Overriding resume2= with resume=? */
+	if (test_action_state(SUSPEND_REPLACE_SWSUSP) && resume_file[0])
+		strncpy(resume2_file, resume_file, 256);
+#endif
+
+	return 0;
+}
+
+#ifdef MODULE
+static __exit void core_unload(void)
+{
+	int i,
+	    numfiles = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data);
+
+	s2_ui_exit();
+	s2_checksum_exit();
+	s2_cluster_exit();
+	s2_usm_exit();
+
+	for (i=0; i< numfiles; i++)
+		suspend_unregister_sysfs_file(&suspend2_subsys.kset.kobj,
+				&sysfs_params[i]);
+
+	s2_core_fns = NULL;
+
+	s2_sysfs_exit();
+}
+MODULE_LICENSE("GPL");
+module_init(core_load);
+module_exit(core_unload);
+#else
+late_initcall(core_load);
+#endif
+
+#ifdef CONFIG_SUSPEND2_EXPORTS
+EXPORT_SYMBOL_GPL(pagedir2);
+#endif
diff --git a/kernel/power/suspend.h b/kernel/power/suspend.h
new file mode 100644
index 0000000..81e752d
--- /dev/null
+++ b/kernel/power/suspend.h
@@ -0,0 +1,182 @@
+/*
+ * kernel/power/suspend.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It contains declarations used throughout swsusp.
+ *
+ */
+
+#ifndef KERNEL_POWER_SUSPEND_H
+#define KERNEL_POWER_SUSPEND_H
+
+#include <linux/delay.h>
+#include <linux/bootmem.h>
+#include <linux/suspend.h>
+#include <linux/dyn_pageflags.h>
+#include <asm/setup.h>
+#include "pageflags.h"
+
+#define SUSPEND_CORE_VERSION "2.2.9.17"
+
+/*		 == Action states == 		*/
+
+enum {
+	SUSPEND_REBOOT,
+	SUSPEND_PAUSE,
+	SUSPEND_SLOW,
+	SUSPEND_LOGALL,
+	SUSPEND_CAN_CANCEL,
+	SUSPEND_KEEP_IMAGE,
+	SUSPEND_FREEZER_TEST,
+	SUSPEND_SINGLESTEP,
+	SUSPEND_PAUSE_NEAR_PAGESET_END,
+	SUSPEND_TEST_FILTER_SPEED,
+	SUSPEND_TEST_BIO,
+	SUSPEND_NO_PAGESET2,
+	SUSPEND_PM_PREPARE_CONSOLE,
+	SUSPEND_IGNORE_ROOTFS,
+	SUSPEND_REPLACE_SWSUSP,
+	SUSPEND_RETRY_RESUME,
+	SUSPEND_PAGESET2_FULL,
+	SUSPEND_ABORT_ON_RESAVE_NEEDED,
+	SUSPEND_NO_MULTITHREADED_IO,
+	SUSPEND_NO_DIRECT_LOAD,
+	SUSPEND_LATE_CPU_HOTPLUG,
+};
+
+extern unsigned long suspend_action;
+
+#define clear_action_state(bit) (test_and_clear_bit(bit, &suspend_action))
+#define test_action_state(bit) (test_bit(bit, &suspend_action))
+
+/*		 == Result states == 		*/
+
+enum {
+	SUSPEND_ABORTED,
+	SUSPEND_ABORT_REQUESTED,
+	SUSPEND_NOSTORAGE_AVAILABLE,
+	SUSPEND_INSUFFICIENT_STORAGE,
+	SUSPEND_FREEZING_FAILED,
+	SUSPEND_UNEXPECTED_ALLOC,
+	SUSPEND_KEPT_IMAGE,
+	SUSPEND_WOULD_EAT_MEMORY,
+	SUSPEND_UNABLE_TO_FREE_ENOUGH_MEMORY,
+	SUSPEND_ENCRYPTION_SETUP_FAILED,
+	SUSPEND_PM_SEM,
+	SUSPEND_DEVICE_REFUSED,
+	SUSPEND_EXTRA_PAGES_ALLOW_TOO_SMALL,
+	SUSPEND_UNABLE_TO_PREPARE_IMAGE,
+	SUSPEND_FAILED_MODULE_INIT,
+	SUSPEND_FAILED_MODULE_CLEANUP,
+	SUSPEND_FAILED_IO,
+	SUSPEND_OUT_OF_MEMORY,
+	SUSPEND_IMAGE_ERROR,
+	SUSPEND_PLATFORM_PREP_FAILED,
+	SUSPEND_CPU_HOTPLUG_FAILED,
+};
+
+extern unsigned long suspend_result;
+
+#define set_result_state(bit) (test_and_set_bit(bit, &suspend_result))
+#define clear_result_state(bit) (test_and_clear_bit(bit, &suspend_result))
+#define test_result_state(bit) (test_bit(bit, &suspend_result))
+
+/*	 == Debug sections and levels == 	*/
+
+/* debugging levels. */
+enum {
+	SUSPEND_STATUS = 0,
+	SUSPEND_ERROR = 2,
+	SUSPEND_LOW,
+	SUSPEND_MEDIUM,
+	SUSPEND_HIGH,
+	SUSPEND_VERBOSE,
+};
+
+enum {
+	SUSPEND_ANY_SECTION,
+	SUSPEND_EAT_MEMORY,
+	SUSPEND_IO,
+	SUSPEND_HEADER,
+	SUSPEND_WRITER,
+	SUSPEND_MEMORY,
+};
+
+extern unsigned long suspend_debug_state;
+
+#define set_debug_state(bit) (test_and_set_bit(bit, &suspend_debug_state))
+#define clear_debug_state(bit) (test_and_clear_bit(bit, &suspend_debug_state))
+#define test_debug_state(bit) (test_bit(bit, &suspend_debug_state))
+
+/*		== Steps in suspending ==	*/
+
+enum {
+	STEP_SUSPEND_PREPARE_IMAGE,
+	STEP_SUSPEND_SAVE_IMAGE,
+	STEP_SUSPEND_POWERDOWN,
+	STEP_RESUME_CAN_RESUME,
+	STEP_RESUME_LOAD_PS1,
+	STEP_RESUME_DO_RESTORE,
+	STEP_RESUME_READ_PS2,
+	STEP_RESUME_GO,
+	STEP_RESUME_ALT_IMAGE,
+};
+
+/*		== Suspend states ==
+	(see also include/linux/suspend.h)	*/
+
+#define get_suspend_state()  (suspend_state)
+#define restore_suspend_state(saved_state) \
+	do { suspend_state = saved_state; } while(0)
+
+/*		== Module support ==		*/
+
+struct suspend2_core_fns {
+	int (*post_context_save)(void);
+	unsigned long (*get_nonconflicting_page)(void);
+	int (*try_suspend)(int have_pmsem);
+	void (*try_resume)(void);
+};
+
+extern struct suspend2_core_fns *s2_core_fns;
+
+/*		== All else ==			*/
+#define KB(x) ((x) << (PAGE_SHIFT - 10))
+#define MB(x) ((x) >> (20 - PAGE_SHIFT))
+
+extern int suspend_start_anything(int suspend_or_resume);
+extern void suspend_finish_anything(int suspend_or_resume);
+
+extern int save_image_part1(void);
+extern int suspend_atomic_restore(void);
+
+extern int _suspend2_try_suspend(int have_pmsem);
+extern void __suspend2_try_resume(void);
+
+extern int __suspend_post_context_save(void);
+
+extern unsigned int nr_suspends;
+extern char resume2_file[256];
+extern char poweroff_resume2[256];
+
+extern void copyback_post(void);
+extern int suspend2_suspend(void);
+extern int extra_pd1_pages_used;
+
+extern int suspend_io_time[2][2];
+
+#define SECTOR_SIZE 512
+
+extern int suspend_early_boot_message 
+	(int can_erase_image, int default_answer, char *warning_reason, ...);
+
+static inline int load_direct(struct page *page)
+{
+	return test_action_state(SUSPEND_NO_DIRECT_LOAD) ? 0 : PagePageset1Copy(page);
+}
+
+extern int pre_resume_freeze(void);
+#endif
diff --git a/kernel/power/suspend2_builtin.c b/kernel/power/suspend2_builtin.c
new file mode 100644
index 0000000..15fe301
--- /dev/null
+++ b/kernel/power/suspend2_builtin.c
@@ -0,0 +1,287 @@
+/*
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ */
+#include <linux/module.h>
+#include <linux/resume-trace.h>
+#include <linux/syscalls.h>
+#include <linux/kernel.h>
+#include <linux/swap.h>
+#include <linux/syscalls.h>
+#include <linux/bio.h>
+#include <linux/root_dev.h>
+#include <linux/freezer.h>
+#include <linux/reboot.h>
+#include <linux/writeback.h>
+#include <linux/tty.h>
+#include <linux/crypto.h>
+#include <linux/cpu.h>
+#include <linux/dyn_pageflags.h>
+#include "io.h"
+#include "suspend.h"
+#include "extent.h"
+#include "block_io.h"
+#include "netlink.h"
+#include "prepare_image.h"
+#include "ui.h"
+#include "sysfs.h"
+#include "pagedir.h"
+#include "modules.h"
+#include "suspend2_builtin.h"
+
+#ifdef CONFIG_SUSPEND2_CORE_EXPORTS
+#ifdef CONFIG_SOFTWARE_SUSPEND
+EXPORT_SYMBOL_GPL(resume_file);
+#endif
+
+EXPORT_SYMBOL_GPL(max_pfn);
+EXPORT_SYMBOL_GPL(free_dyn_pageflags);
+EXPORT_SYMBOL_GPL(clear_dynpageflag);
+EXPORT_SYMBOL_GPL(test_dynpageflag);
+EXPORT_SYMBOL_GPL(set_dynpageflag);
+EXPORT_SYMBOL_GPL(get_next_bit_on);
+EXPORT_SYMBOL_GPL(allocate_dyn_pageflags);
+EXPORT_SYMBOL_GPL(clear_dyn_pageflags);
+
+#ifdef CONFIG_X86_64
+EXPORT_SYMBOL_GPL(restore_processor_state);
+EXPORT_SYMBOL_GPL(save_processor_state);
+#endif
+
+EXPORT_SYMBOL_GPL(kernel_shutdown_prepare);
+EXPORT_SYMBOL_GPL(drop_pagecache);
+EXPORT_SYMBOL_GPL(restore_pblist);
+EXPORT_SYMBOL_GPL(pm_mutex);
+EXPORT_SYMBOL_GPL(pm_restore_console);
+EXPORT_SYMBOL_GPL(super_blocks);
+EXPORT_SYMBOL_GPL(next_zone);
+
+EXPORT_SYMBOL_GPL(freeze_processes);
+EXPORT_SYMBOL_GPL(thaw_processes);
+EXPORT_SYMBOL_GPL(thaw_kernel_threads);
+EXPORT_SYMBOL_GPL(shrink_all_memory);
+EXPORT_SYMBOL_GPL(shrink_one_zone);
+EXPORT_SYMBOL_GPL(saveable_page);
+EXPORT_SYMBOL_GPL(swsusp_arch_suspend);
+EXPORT_SYMBOL_GPL(swsusp_arch_resume);
+EXPORT_SYMBOL_GPL(pm_ops);
+EXPORT_SYMBOL_GPL(pm_prepare_console);
+EXPORT_SYMBOL_GPL(follow_page);
+EXPORT_SYMBOL_GPL(machine_halt);
+EXPORT_SYMBOL_GPL(block_dump);
+EXPORT_SYMBOL_GPL(unlink_lru_lists);
+EXPORT_SYMBOL_GPL(relink_lru_lists);
+EXPORT_SYMBOL_GPL(power_subsys);
+EXPORT_SYMBOL_GPL(machine_power_off);
+EXPORT_SYMBOL_GPL(suspend_enter);
+EXPORT_SYMBOL_GPL(first_online_pgdat);
+EXPORT_SYMBOL_GPL(next_online_pgdat);
+EXPORT_SYMBOL_GPL(machine_restart);
+EXPORT_SYMBOL_GPL(saved_command_line);
+EXPORT_SYMBOL_GPL(tasklist_lock);
+#ifdef CONFIG_SUSPEND_SMP
+EXPORT_SYMBOL_GPL(disable_nonboot_cpus);
+EXPORT_SYMBOL_GPL(enable_nonboot_cpus);
+#endif
+#endif
+
+#ifdef CONFIG_SUSPEND2_USERUI_EXPORTS
+EXPORT_SYMBOL_GPL(kmsg_redirect);
+EXPORT_SYMBOL_GPL(console_printk);
+#ifndef CONFIG_COMPAT
+EXPORT_SYMBOL_GPL(sys_ioctl);
+#endif
+#endif
+
+#ifdef CONFIG_SUSPEND2_SWAP_EXPORTS	/* Suspend swap specific */
+EXPORT_SYMBOL_GPL(sys_swapon);
+EXPORT_SYMBOL_GPL(sys_swapoff);
+EXPORT_SYMBOL_GPL(si_swapinfo);
+EXPORT_SYMBOL_GPL(map_swap_page);
+EXPORT_SYMBOL_GPL(get_swap_page);
+EXPORT_SYMBOL_GPL(swap_free);
+EXPORT_SYMBOL_GPL(get_swap_info_struct);
+#endif
+
+#ifdef CONFIG_SUSPEND2_FILE_EXPORTS
+/* Suspend_file specific */
+extern char * __initdata root_device_name;
+
+EXPORT_SYMBOL_GPL(ROOT_DEV);
+EXPORT_SYMBOL_GPL(root_device_name);
+EXPORT_SYMBOL_GPL(sys_unlink);
+EXPORT_SYMBOL_GPL(sys_mknod);
+#endif
+
+/* Swap or file */
+#if defined(CONFIG_SUSPEND2_FILE_EXPORTS) || defined(CONFIG_SUSPEND2_SWAP_EXPORTS)
+EXPORT_SYMBOL_GPL(bio_set_pages_dirty);
+EXPORT_SYMBOL_GPL(name_to_dev_t);
+#endif
+
+#if defined(CONFIG_SUSPEND2_EXPORTS) || defined(CONFIG_SUSPEND2_CORE_EXPORTS)
+EXPORT_SYMBOL_GPL(snprintf_used);
+#endif
+struct suspend2_core_fns *s2_core_fns;
+EXPORT_SYMBOL_GPL(s2_core_fns);
+
+dyn_pageflags_t pageset1_map;
+dyn_pageflags_t pageset1_copy_map;
+EXPORT_SYMBOL_GPL(pageset1_map);
+EXPORT_SYMBOL_GPL(pageset1_copy_map);
+
+unsigned long suspend_result = 0;
+unsigned long suspend_debug_state = 0;
+int suspend_io_time[2][2];
+struct pagedir pagedir1 = {1};
+
+EXPORT_SYMBOL_GPL(suspend_io_time);
+EXPORT_SYMBOL_GPL(suspend_debug_state);
+EXPORT_SYMBOL_GPL(suspend_result);
+EXPORT_SYMBOL_GPL(pagedir1);
+
+unsigned long suspend_get_nonconflicting_page(void)
+{
+	return s2_core_fns->get_nonconflicting_page();
+}
+
+int suspend_post_context_save(void)
+{
+	return s2_core_fns->post_context_save();
+}
+
+int suspend2_try_suspend(int have_pmsem)
+{
+	if (!s2_core_fns)
+		return -ENODEV;
+
+	return s2_core_fns->try_suspend(have_pmsem);
+}
+
+void suspend2_try_resume(void)
+{
+	if (s2_core_fns)
+		s2_core_fns->try_resume();
+}
+
+int suspend2_lowlevel_builtin(void)
+{
+	int error = 0;
+
+	save_processor_state();
+	if ((error = swsusp_arch_suspend()))
+		printk(KERN_ERR "Error %d suspending\n", error);
+	/* Restore control flow appears here */
+	restore_processor_state();
+
+	return error;
+}
+
+EXPORT_SYMBOL_GPL(suspend2_lowlevel_builtin);
+
+unsigned long suspend_compress_bytes_in, suspend_compress_bytes_out;
+EXPORT_SYMBOL_GPL(suspend_compress_bytes_in);
+EXPORT_SYMBOL_GPL(suspend_compress_bytes_out);
+
+#ifdef CONFIG_SUSPEND2_REPLACE_SWSUSP
+unsigned long suspend_action = (1 << SUSPEND_REPLACE_SWSUSP) | (1 << SUSPEND_PAGESET2_FULL);
+#else
+unsigned long suspend_action = 1 << SUSPEND_PAGESET2_FULL;
+#endif
+EXPORT_SYMBOL_GPL(suspend_action);
+
+unsigned long suspend_state = ((1 << SUSPEND_BOOT_TIME) |
+		(1 << SUSPEND_IGNORE_LOGLEVEL) |
+		(1 << SUSPEND_IO_STOPPED));
+EXPORT_SYMBOL_GPL(suspend_state);
+
+/* The number of suspends we have started (some may have been cancelled) */
+unsigned int nr_suspends;
+EXPORT_SYMBOL_GPL(nr_suspends);
+
+char resume2_file[256] = CONFIG_SUSPEND2_DEFAULT_RESUME2;
+EXPORT_SYMBOL_GPL(resume2_file);
+
+int suspend2_running = 0;
+EXPORT_SYMBOL_GPL(suspend2_running);
+
+int suspend2_in_suspend __nosavedata;
+EXPORT_SYMBOL_GPL(suspend2_in_suspend);
+
+unsigned long suspend2_nosave_state1 __nosavedata = 0;
+unsigned long suspend2_nosave_state2 __nosavedata = 0;
+int suspend2_nosave_state3 __nosavedata = 0;
+int suspend2_nosave_io_speed[2][2] __nosavedata;
+__nosavedata char suspend2_nosave_commandline[COMMAND_LINE_SIZE];
+
+__nosavedata struct pbe *restore_highmem_pblist;
+
+#ifdef CONFIG_SUSPEND2_CORE_EXPORTS
+#ifdef CONFIG_HIGHMEM
+EXPORT_SYMBOL_GPL(nr_free_highpages);
+EXPORT_SYMBOL_GPL(saveable_highmem_page);
+EXPORT_SYMBOL_GPL(restore_highmem_pblist);
+#endif
+
+EXPORT_SYMBOL_GPL(suspend2_nosave_state1);
+EXPORT_SYMBOL_GPL(suspend2_nosave_state2);
+EXPORT_SYMBOL_GPL(suspend2_nosave_state3);
+EXPORT_SYMBOL_GPL(suspend2_nosave_io_speed);
+EXPORT_SYMBOL_GPL(suspend2_nosave_commandline);
+#endif
+
+/* --  Commandline Parameter Handling ---
+ *
+ * Resume setup: obtain the storage device.
+ */
+static int __init resume2_setup(char *str)
+{
+	if (!*str)
+		return 0;
+	
+	strncpy(resume2_file, str, 255);
+	return 0;
+}
+
+/*
+ * Allow the user to specify that we should ignore any image found and
+ * invalidate the image if necesssary. This is equivalent to running
+ * the task queue and a sync and then turning off the power. The same
+ * precautions should be taken: fsck if you're not journalled.
+ */
+static int __init noresume2_setup(char *str)
+{
+	set_suspend_state(SUSPEND_NORESUME_SPECIFIED);
+	return 0;
+}
+
+static int __init suspend_retry_resume_setup(char *str)
+{
+	set_suspend_state(SUSPEND_RETRY_RESUME);
+	return 0;
+}
+
+#ifndef CONFIG_SOFTWARE_SUSPEND
+static int __init resume_setup(char *str)
+{
+	if (!*str)
+		return 0;
+	
+	strncpy(resume2_file, str, 255);
+	return 0;
+}
+
+static int __init noresume_setup(char *str)
+{
+	set_suspend_state(SUSPEND_NORESUME_SPECIFIED);
+	return 0;
+}
+__setup("noresume", noresume_setup);
+__setup("resume=", resume_setup);
+#endif
+
+__setup("noresume2", noresume2_setup);
+__setup("resume2=", resume2_setup);
+__setup("suspend_retry_resume", suspend_retry_resume_setup);
+
diff --git a/kernel/power/suspend2_builtin.h b/kernel/power/suspend2_builtin.h
new file mode 100644
index 0000000..968b24b
--- /dev/null
+++ b/kernel/power/suspend2_builtin.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ */
+#include <linux/dyn_pageflags.h>
+#include <asm/setup.h>
+
+extern struct suspend2_core_fns *s2_core_fns;
+extern unsigned long suspend_compress_bytes_in, suspend_compress_bytes_out;
+extern unsigned long suspend_action;
+extern unsigned int nr_suspends;
+extern char resume2_file[256];
+extern int suspend2_in_suspend;
+
+extern unsigned long suspend2_nosave_state1 __nosavedata;
+extern unsigned long suspend2_nosave_state2 __nosavedata;
+extern int suspend2_nosave_state3 __nosavedata;
+extern int suspend2_nosave_io_speed[2][2] __nosavedata;
+extern __nosavedata char suspend2_nosave_commandline[COMMAND_LINE_SIZE];
+extern __nosavedata struct pbe *restore_highmem_pblist;
+
+int suspend2_lowlevel_builtin(void);
+
+extern dyn_pageflags_t __nosavedata suspend2_nosave_origmap;
+extern dyn_pageflags_t __nosavedata suspend2_nosave_copymap;
+
+#ifdef CONFIG_HIGHMEM
+extern __nosavedata struct zone_data *suspend2_nosave_zone_list;
+extern __nosavedata unsigned long suspend2_nosave_max_pfn;
+#endif
+
+extern unsigned long suspend_get_nonconflicting_page(void);
+extern int suspend_post_context_save(void);
+extern int suspend2_try_suspend(int have_pmsem);
diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
new file mode 100644
index 0000000..533ae5c
--- /dev/null
+++ b/kernel/power/suspend_block_io.c
@@ -0,0 +1,1020 @@
+/*
+ * kernel/power/suspend_block_io.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * Distributed under GPLv2.
+ * 
+ * This file contains block io functions for suspend2. These are
+ * used by the swapwriter and it is planned that they will also
+ * be used by the NFSwriter.
+ *
+ */
+
+#include <linux/blkdev.h>
+#include <linux/syscalls.h>
+#include <linux/suspend.h>
+
+#include "suspend.h"
+#include "sysfs.h"
+#include "modules.h"
+#include "prepare_image.h"
+#include "block_io.h"
+#include "ui.h"
+
+static int pr_index;
+
+#if 0
+#define PR_DEBUG(a, b...) do { if (pr_index < 20) printk(a, ##b); } while(0)
+#else
+#define PR_DEBUG(a, b...) do { } while(0)
+#endif
+
+#define MAX_OUTSTANDING_IO 2048
+#define SUBMIT_BATCH_SIZE 128
+
+static int max_outstanding_io = MAX_OUTSTANDING_IO;
+static int submit_batch_size = SUBMIT_BATCH_SIZE;
+
+struct io_info {
+	struct bio *sys_struct;
+	sector_t first_block;
+	struct page *bio_page, *dest_page;
+	int writing, readahead_index;
+	struct block_device *dev;
+	struct list_head list;
+};
+
+static LIST_HEAD(ioinfo_ready_for_cleanup);
+static DEFINE_SPINLOCK(ioinfo_ready_lock);
+
+static LIST_HEAD(ioinfo_submit_batch);
+static DEFINE_SPINLOCK(ioinfo_submit_lock);
+
+static LIST_HEAD(ioinfo_busy);
+static DEFINE_SPINLOCK(ioinfo_busy_lock);
+
+static struct io_info *waiting_on;
+
+static atomic_t submit_batch;
+static int submit_batched(void);
+
+/* [Max] number of I/O operations pending */
+static atomic_t outstanding_io;
+
+static int extra_page_forward = 0;
+
+static volatile unsigned long suspend_readahead_flags[
+	DIV_ROUND_UP(MAX_OUTSTANDING_IO, BITS_PER_LONG)];
+static spinlock_t suspend_readahead_flags_lock = SPIN_LOCK_UNLOCKED;
+static struct page *suspend_readahead_pages[MAX_OUTSTANDING_IO];
+static int readahead_index, readahead_submit_index;
+
+static int current_stream;
+/* 0 = Header, 1 = Pageset1, 2 = Pageset2 */
+struct extent_iterate_saved_state suspend_writer_posn_save[3];
+
+/* Pointer to current entry being loaded/saved. */
+struct extent_iterate_state suspend_writer_posn;
+
+/* Not static, so that the allocators can setup and complete
+ * writing the header */
+char *suspend_writer_buffer;
+int suspend_writer_buffer_posn;
+
+int suspend_read_fd;
+
+static struct suspend_bdev_info *suspend_devinfo;
+
+int suspend_header_bytes_used = 0;
+
+DEFINE_MUTEX(suspend_bio_mutex);
+
+/*
+ * __suspend_bio_cleanup_one
+ * 
+ * Description: Clean up after completing I/O on a page.
+ * Arguments:	struct io_info:	Data for I/O to be completed.
+ */
+static void __suspend_bio_cleanup_one(struct io_info *io_info)
+{
+	suspend_message(SUSPEND_WRITER, SUSPEND_HIGH, 0,
+		"Cleanup IO: [%p]\n", io_info);
+
+	if (!io_info->writing && io_info->readahead_index == -1) {
+		char *from, *to;
+		/*
+		 * Copy the page we read into the buffer our caller provided.
+		 */
+		to = (char *) kmap(io_info->dest_page);
+		from = (char *) kmap(io_info->bio_page);
+		memcpy(to, from, PAGE_SIZE);
+		kunmap(io_info->dest_page);
+		kunmap(io_info->bio_page);
+	}
+
+	if (io_info->writing || io_info->readahead_index == -1) {
+		/* Sanity check */
+		if (page_count(io_info->bio_page) != 2)
+			printk(KERN_EMERG "Cleanup IO: Page count on page %p"
+					" is %d. Not good!\n",
+					io_info->bio_page,
+					page_count(io_info->bio_page));
+		put_page(io_info->bio_page);
+		__free_page(io_info->bio_page);
+	} else
+		put_page(io_info->bio_page);
+	
+	bio_put(io_info->sys_struct);
+	io_info->sys_struct = NULL;
+}
+
+/* __suspend_io_cleanup
+ */
+
+static void suspend_bio_cleanup_one(void *data)
+{
+	struct io_info *io_info = (struct io_info *) data;
+	int readahead_index;
+	unsigned long flags;
+
+	readahead_index = io_info->readahead_index;
+	list_del_init(&io_info->list);
+	__suspend_bio_cleanup_one(io_info);
+
+	if (readahead_index > -1) {
+		int index = readahead_index/BITS_PER_LONG;
+		int bit = readahead_index - (index * BITS_PER_LONG);
+		spin_lock_irqsave(&suspend_readahead_flags_lock, flags);
+		set_bit(bit, &suspend_readahead_flags[index]);
+		spin_unlock_irqrestore(&suspend_readahead_flags_lock, flags);
+	}
+
+	if (waiting_on == io_info)
+		waiting_on = NULL;
+	kfree(io_info);
+	atomic_dec(&outstanding_io);
+}
+
+/* suspend_cleanup_some_completed_io
+ *
+ * NB: This is designed so that multiple callers can be in here simultaneously.
+ */
+
+static void suspend_cleanup_some_completed_io(void)
+{
+	int num_cleaned = 0;
+	struct io_info *first;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ioinfo_ready_lock, flags);
+	while(!list_empty(&ioinfo_ready_for_cleanup)) {
+		first = list_entry(ioinfo_ready_for_cleanup.next,
+				struct io_info, list);
+
+		list_del_init(&first->list);
+
+		spin_unlock_irqrestore(&ioinfo_ready_lock, flags);
+		suspend_bio_cleanup_one((void *) first);
+		spin_lock_irqsave(&ioinfo_ready_lock, flags);
+
+		num_cleaned++;
+		if (num_cleaned == submit_batch_size)
+			break;
+	}
+	spin_unlock_irqrestore(&ioinfo_ready_lock, flags);
+}
+
+/* do_bio_wait
+ *
+ * Actions taken when we want some I/O to get run.
+ * 
+ * Submit any I/O that's batched up (if we're not already doing
+ * that, unplug queues, schedule and clean up whatever we can.
+ */
+static void do_bio_wait(void)
+{
+	int num_submitted = 0;
+
+	/* Don't want to wait on I/O we haven't submitted! */
+	num_submitted = submit_batched();
+
+	kblockd_flush();
+	
+	io_schedule();
+
+	suspend_cleanup_some_completed_io();
+}
+
+/*
+ * suspend_finish_all_io
+ *
+ * Description:	Finishes all IO and frees all IO info struct pages.
+ */
+static void suspend_finish_all_io(void)
+{
+	/* Wait for all I/O to complete. */
+	while (atomic_read(&outstanding_io))
+		do_bio_wait();
+}
+
+/*
+ * wait_on_readahead
+ *
+ * Wait until a particular readahead is ready.
+ */
+static void suspend_wait_on_readahead(int readahead_index)
+{
+	int index = readahead_index / BITS_PER_LONG;
+	int bit = readahead_index - index * BITS_PER_LONG;
+
+	/* read_ahead_index is the one we want to return */
+	while (!test_bit(bit, &suspend_readahead_flags[index]))
+		do_bio_wait();
+}
+
+/*
+ * readahead_done
+ *
+ * Returns whether the readahead requested is ready.
+ */
+
+static int suspend_readahead_ready(int readahead_index)
+{
+	int index = readahead_index / BITS_PER_LONG;
+	int bit = readahead_index - (index * BITS_PER_LONG);
+
+	return test_bit(bit, &suspend_readahead_flags[index]);
+}
+
+/* suspend_readahead_prepare
+ * Set up for doing readahead on an image */
+static int suspend_prepare_readahead(int index)
+{
+	unsigned long new_page = get_zeroed_page(GFP_ATOMIC | __GFP_NOWARN);
+
+	if(!new_page)
+		return -ENOMEM;
+
+	suspend_readahead_pages[index] = virt_to_page(new_page);
+	return 0;
+}
+
+/* suspend_readahead_cleanup
+ * Clean up structures used for readahead */
+static void suspend_cleanup_readahead(int page)
+{
+	__free_page(suspend_readahead_pages[page]);
+	suspend_readahead_pages[page] = 0;
+	return;
+}
+
+/*
+ * suspend_end_bio
+ *
+ * Description:	Function called by block driver from interrupt context when I/O
+ * 		is completed. This is the reason we use spinlocks in
+ * 		manipulating the io_info lists. 		
+ * 		Nearly the fs/buffer.c version, but we want to mark the page as 
+ * 		done in our own structures too.
+ */
+
+static int suspend_end_bio(struct bio *bio, unsigned int num, int err)
+{
+	struct io_info *io_info = bio->bi_private;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ioinfo_busy_lock, flags);
+	list_del_init(&io_info->list);
+	spin_unlock_irqrestore(&ioinfo_busy_lock, flags);
+
+	spin_lock_irqsave(&ioinfo_ready_lock, flags);
+	list_add_tail(&io_info->list, &ioinfo_ready_for_cleanup);
+	spin_unlock_irqrestore(&ioinfo_ready_lock, flags);
+	return 0;
+}
+
+/**
+ *	submit - submit BIO request.
+ *	@writing: READ or WRITE.
+ *	@io_info: IO info structure.
+ *
+ * 	Based on Patrick's pmdisk code from long ago:
+ *	"Straight from the textbook - allocate and initialize the bio.
+ *	If we're writing, make sure the page is marked as dirty.
+ *	Then submit it and carry on."
+ *
+ *	With a twist, though - we handle block_size != PAGE_SIZE.
+ *	Caller has already checked that our page is not fragmented.
+ */
+
+static int submit(struct io_info *io_info)
+{
+	struct bio *bio = NULL;
+	unsigned long flags;
+
+	while (!bio) {
+		bio = bio_alloc(GFP_ATOMIC,1);
+		if (!bio)
+			do_bio_wait();
+	}
+
+	bio->bi_bdev = io_info->dev;
+	bio->bi_sector = io_info->first_block;
+	bio->bi_private = io_info;
+	bio->bi_end_io = suspend_end_bio;
+	io_info->sys_struct = bio;
+
+	if (bio_add_page(bio, io_info->bio_page, PAGE_SIZE, 0) < PAGE_SIZE) {
+		printk("ERROR: adding page to bio at %lld\n",
+				(unsigned long long) io_info->first_block);
+		bio_put(bio);
+		return -EFAULT;
+	}
+
+	if (io_info->writing)
+		bio_set_pages_dirty(bio);
+
+	spin_lock_irqsave(&ioinfo_busy_lock, flags);
+	list_add_tail(&io_info->list, &ioinfo_busy);
+	spin_unlock_irqrestore(&ioinfo_busy_lock, flags);
+	
+	submit_bio(io_info->writing, bio);
+
+	return 0;
+}
+
+/* 
+ * submit a batch. The submit function can wait on I/O, so we have
+ * simple locking to avoid infinite recursion.
+ */
+static int submit_batched(void)
+{
+	static int running_already = 0;
+	struct io_info *first;
+	unsigned long flags;
+	int num_submitted = 0;
+
+	if (running_already)
+		return 0;
+
+	running_already = 1;
+	spin_lock_irqsave(&ioinfo_submit_lock, flags);
+	while(!list_empty(&ioinfo_submit_batch)) {
+		first = list_entry(ioinfo_submit_batch.next, struct io_info,
+				list);
+		list_del_init(&first->list);
+		atomic_dec(&submit_batch);
+		spin_unlock_irqrestore(&ioinfo_submit_lock, flags);
+		submit(first);
+		spin_lock_irqsave(&ioinfo_submit_lock, flags);
+		num_submitted++;
+		if (num_submitted == submit_batch_size)
+			break;
+	}
+	spin_unlock_irqrestore(&ioinfo_submit_lock, flags);
+	running_already = 0;
+
+	return num_submitted;
+}
+
+static void add_to_batch(struct io_info *io_info)
+{
+	unsigned long flags;
+	int waiting;
+
+	/* Put our prepared I/O struct on the batch list. */
+	spin_lock_irqsave(&ioinfo_submit_lock, flags);
+	list_add_tail(&io_info->list, &ioinfo_submit_batch);
+	waiting = atomic_add_return(1, &submit_batch);
+	spin_unlock_irqrestore(&ioinfo_submit_lock, flags);
+
+	if (waiting >= submit_batch_size)
+		submit_batched();
+}
+
+/*
+ * get_io_info_struct
+ *
+ * Description:	Get an I/O struct.
+ * Returns:	Pointer to the struct prepared for use.
+ */
+static struct io_info *get_io_info_struct(void)
+{
+	struct io_info *this = NULL;
+
+	do {
+		while (atomic_read(&outstanding_io) >= max_outstanding_io)
+			do_bio_wait();
+
+		this = kmalloc(sizeof(struct io_info), GFP_ATOMIC);
+	} while (!this);
+
+	INIT_LIST_HEAD(&this->list);
+	return this;
+}
+
+/*
+ * suspend_do_io
+ *
+ * Description:	Prepare and start a read or write operation.
+ * 		Note that we use our own buffer for reading or writing.
+ * 		This simplifies doing readahead and asynchronous writing.
+ * 		We can begin a read without knowing the location into which
+ * 		the data will eventually be placed, and the buffer passed
+ * 		for a write can be reused immediately (essential for the
+ * 		modules system).
+ * 		Failure? What's that?
+ * Returns:	The io_info struct created.
+ */
+static int suspend_do_io(int writing, struct block_device *bdev, long block0,
+	struct page *page, int readahead_index, int syncio)
+{
+	struct io_info *io_info;
+	unsigned long buffer_virt = 0;
+	char *to, *from;
+
+	io_info = get_io_info_struct();
+
+	/* Done before submitting to avoid races. */
+	if (syncio)
+		waiting_on = io_info;
+
+	/* Get our local buffer */
+	suspend_message(SUSPEND_WRITER, SUSPEND_HIGH, 1,
+			"Start_IO: [%p]", io_info);
+	
+	/* Copy settings to the io_info struct */
+	io_info->writing = writing;
+	io_info->dev = bdev;
+	io_info->first_block = block0;
+	io_info->dest_page = page;
+	io_info->readahead_index = readahead_index;
+
+	if (io_info->readahead_index == -1) {
+		while (!(buffer_virt = get_zeroed_page(GFP_ATOMIC | __GFP_NOWARN)))
+			do_bio_wait();
+
+		suspend_message(SUSPEND_WRITER, SUSPEND_HIGH, 0,
+				"[ALLOC BUFFER]->%d",
+				real_nr_free_pages(all_zones_mask));
+		io_info->bio_page = virt_to_page(buffer_virt);
+	} else {
+		unsigned long flags;
+		int index = io_info->readahead_index / BITS_PER_LONG;
+		int bit = io_info->readahead_index - index * BITS_PER_LONG;
+
+		spin_lock_irqsave(&suspend_readahead_flags_lock, flags);
+		clear_bit(bit, &suspend_readahead_flags[index]);
+		spin_unlock_irqrestore(&suspend_readahead_flags_lock, flags);
+
+		io_info->bio_page = page;
+	}
+
+	/* If writing, copy our data. The data is probably in
+	 * lowmem, but we cannot be certain. If there is no
+	 * compression/encryption, we might be passed the
+	 * actual source page's address. */
+	if (writing) {
+		to = (char *) buffer_virt;
+		from = kmap_atomic(page, KM_USER1);
+		memcpy(to, from, PAGE_SIZE);
+		kunmap_atomic(from, KM_USER1);
+	}
+
+	/* Submit the page */
+	get_page(io_info->bio_page);
+	
+	suspend_message(SUSPEND_WRITER, SUSPEND_HIGH, 1,
+		"-> (PRE BRW) %d\n", real_nr_free_pages(all_zones_mask));
+
+	if (syncio)
+	 	submit(io_info);
+	else
+		add_to_batch(io_info);
+	
+	atomic_inc(&outstanding_io);
+	
+	if (syncio)
+		do { do_bio_wait(); } while (waiting_on);
+
+	return 0;
+}
+
+/* We used to use bread here, but it doesn't correctly handle
+ * blocksize != PAGE_SIZE. Now we create a submit_info to get the data we
+ * want and use our normal routines (synchronously).
+ */
+
+static int suspend_bdev_page_io(int writing, struct block_device *bdev,
+		long pos, struct page *page)
+{
+	return suspend_do_io(writing, bdev, pos, page, -1, 1);
+}
+
+static int suspend_bio_memory_needed(void)
+{
+	/* We want to have at least enough memory so as to have
+	 * max_outstanding_io transactions on the fly at once. If we 
+	 * can do more, fine. */
+	return (max_outstanding_io * (PAGE_SIZE + sizeof(struct request) +
+				sizeof(struct bio) + sizeof(struct io_info)));
+}
+
+static void suspend_set_devinfo(struct suspend_bdev_info *info)
+{
+	suspend_devinfo = info;
+}
+
+static void dump_block_chains(void)
+{
+	int i;
+
+	for (i = 0; i < suspend_writer_posn.num_chains; i++) {
+		struct extent *this;
+
+		printk("Chain %d:", i);
+
+		this = (suspend_writer_posn.chains + i)->first;
+
+		if (!this)
+			printk(" (Empty)");
+
+		while (this) {
+			printk(" [%lu-%lu]%s", this->minimum, this->maximum,
+					this->next ? "," : "");
+			this = this->next;
+		}
+
+		printk("\n");
+	}
+
+	for (i = 0; i < 3; i++)
+		printk("Posn %d: Chain %d, extent %d, offset %lu.\n", i,
+				suspend_writer_posn_save[i].chain_num,
+				suspend_writer_posn_save[i].extent_num,
+				suspend_writer_posn_save[i].offset);
+}
+static int forward_extra_blocks(void)
+{
+	int i;
+
+	for (i = 1; i < suspend_devinfo[suspend_writer_posn.current_chain].
+							blocks_per_page; i++)
+		suspend_extent_state_next(&suspend_writer_posn);
+
+	if (suspend_extent_state_eof(&suspend_writer_posn)) {
+		printk("Extent state eof.\n");
+		dump_block_chains();
+		return -ENODATA;
+	}
+
+	return 0;
+}
+
+static int forward_one_page(void)
+{
+	int at_start = (suspend_writer_posn.current_chain == -1);
+
+	/* Have to go forward one to ensure we're on the right chain,
+	 * before we can know how many more blocks to skip.*/
+	suspend_extent_state_next(&suspend_writer_posn);
+
+	if (!at_start && forward_extra_blocks())
+		return -ENODATA;
+
+	if (extra_page_forward) {
+		extra_page_forward = 0;
+		return forward_one_page();
+	}
+
+	return 0;
+}
+
+/* Used in reading header, to jump to 2nd page after getting 1st page
+ * direct from image header. */
+static void set_extra_page_forward(void)
+{
+	extra_page_forward = 1;
+}
+
+static int suspend_bio_rw_page(int writing, struct page *page,
+		int readahead_index, int sync)
+{
+	struct suspend_bdev_info *dev_info;
+
+	if (test_action_state(SUSPEND_TEST_FILTER_SPEED))
+		return 0;
+		
+	if (forward_one_page()) {
+		printk("Failed to advance a page in the extent data.\n");
+		return -ENODATA;
+	}
+
+	if (current_stream == 0 && writing &&
+		suspend_writer_posn.current_chain == suspend_writer_posn_save[2].chain_num &&
+		suspend_writer_posn.current_offset == suspend_writer_posn_save[2].offset) {
+		dump_block_chains();
+		BUG();
+	}
+
+	dev_info = &suspend_devinfo[suspend_writer_posn.current_chain];
+
+	return suspend_do_io(writing, dev_info->bdev,
+		suspend_writer_posn.current_offset <<
+			dev_info->bmap_shift,
+		page, readahead_index, sync);
+}
+
+static int suspend_rw_init(int writing, int stream_number)
+{
+	suspend_header_bytes_used = 0;
+
+	suspend_extent_state_restore(&suspend_writer_posn,
+			&suspend_writer_posn_save[stream_number]);
+
+	suspend_writer_buffer_posn = writing ? 0 : PAGE_SIZE;
+
+	current_stream = stream_number;
+
+	readahead_index = readahead_submit_index = -1;
+
+	pr_index = 0;
+
+	return 0;
+}
+
+static void suspend_read_header_init(void)
+{
+	readahead_index = readahead_submit_index = -1;
+}
+
+static int suspend_rw_cleanup(int writing)
+{
+	if (writing && suspend_bio_rw_page(WRITE,
+			virt_to_page(suspend_writer_buffer), -1, 0))
+		return -EIO;
+
+	if (writing && current_stream == 2)
+		suspend_extent_state_save(&suspend_writer_posn,
+				&suspend_writer_posn_save[1]);
+	
+	suspend_finish_all_io();
+	
+	if (!writing)
+		while (readahead_index != readahead_submit_index) {
+			suspend_cleanup_readahead(readahead_index);
+			readahead_index++;
+			if (readahead_index == max_outstanding_io)
+				readahead_index = 0;
+		}
+
+	current_stream = 0;
+
+	return 0;
+}
+
+static int suspend_bio_read_page_with_readahead(void)
+{
+	static int last_result;
+	unsigned long *virt;
+
+	if (readahead_index == -1) {
+		last_result = 0;
+		readahead_index = readahead_submit_index = 0;
+	}
+
+	/* Start a new readahead? */
+	if (last_result) {
+		/* We failed to submit a read, and have cleaned up
+		 * all the readahead previously submitted */
+		if (readahead_submit_index == readahead_index) {
+			abort_suspend(SUSPEND_FAILED_IO, "Failed to submit"
+				" a read and no readahead left.\n");
+			return -EIO;
+		}
+		goto wait;
+	}
+	
+	do {
+		if (suspend_prepare_readahead(readahead_submit_index))
+			break;
+
+		last_result = suspend_bio_rw_page(READ,
+			suspend_readahead_pages[readahead_submit_index], 
+			readahead_submit_index, SUSPEND_ASYNC);
+		if (last_result) {
+			printk("Begin read chunk for page %d returned %d.\n",
+				readahead_submit_index, last_result);
+			suspend_cleanup_readahead(readahead_submit_index);
+			break;
+		}
+
+		readahead_submit_index++;
+
+		if (readahead_submit_index == max_outstanding_io)
+			readahead_submit_index = 0;
+
+	} while((!last_result) && (readahead_submit_index != readahead_index) &&
+			(!suspend_readahead_ready(readahead_index)));
+
+wait:
+	suspend_wait_on_readahead(readahead_index);
+
+	virt = kmap_atomic(suspend_readahead_pages[readahead_index], KM_USER1);
+	memcpy(suspend_writer_buffer, virt, PAGE_SIZE);
+	kunmap_atomic(virt, KM_USER1);
+
+	suspend_cleanup_readahead(readahead_index);
+
+	readahead_index++;
+	if (readahead_index == max_outstanding_io)
+		readahead_index = 0;
+
+	return 0;
+}
+
+/*
+ *
+ */
+
+static int suspend_rw_buffer(int writing, char *buffer, int buffer_size)
+{
+	int bytes_left = buffer_size;
+
+	/* Read/write a chunk of the header */
+	while (bytes_left) {
+		char *source_start = buffer + buffer_size - bytes_left;
+		char *dest_start = suspend_writer_buffer + suspend_writer_buffer_posn;
+		int capacity = PAGE_SIZE - suspend_writer_buffer_posn;
+		char *to = writing ? dest_start : source_start;
+		char *from = writing ? source_start : dest_start;
+
+		if (bytes_left <= capacity) {
+			if (test_debug_state(SUSPEND_HEADER))
+				printk("Copy %d bytes %d-%d from %p to %p.\n",
+						bytes_left,
+						suspend_header_bytes_used,
+						suspend_header_bytes_used + bytes_left,
+						from, to);
+			memcpy(to, from, bytes_left);
+			suspend_writer_buffer_posn += bytes_left;
+			suspend_header_bytes_used += bytes_left;
+			return 0;
+		}
+
+		/* Complete this page and start a new one */
+		if (test_debug_state(SUSPEND_HEADER))
+			printk("Copy %d bytes (%d-%d) from %p to %p.\n",
+					capacity,
+					suspend_header_bytes_used,
+					suspend_header_bytes_used + capacity,
+					from, to);
+		memcpy(to, from, capacity);
+		bytes_left -= capacity;
+		suspend_header_bytes_used += capacity;
+
+		if (!writing) {
+			if (test_suspend_state(SUSPEND_TRY_RESUME_RD))
+				sys_read(suspend_read_fd,
+					suspend_writer_buffer, BLOCK_SIZE);
+			else
+				if (suspend_bio_read_page_with_readahead())
+					return -EIO;
+		} else if (suspend_bio_rw_page(WRITE,
+					virt_to_page(suspend_writer_buffer),
+					-1, SUSPEND_ASYNC))
+				return -EIO;
+
+		suspend_writer_buffer_posn = 0;
+		suspend_cond_pause(0, NULL);
+	}
+
+	return 0;
+}
+
+/*
+ * suspend_bio_read_chunk
+ *
+ * Read a (possibly compressed and/or encrypted) page from the image,
+ * into buffer_page, returning it's index and the buffer size.
+ *
+ * If asynchronous I/O is requested, use readahead.
+ */
+
+static int suspend_bio_read_chunk(unsigned long *index, struct page *buffer_page,
+		unsigned int *buf_size, int sync)
+{
+	int result;
+	char *buffer_virt = kmap(buffer_page);
+
+	pr_index++;
+
+	while (!mutex_trylock(&suspend_bio_mutex))
+		do_bio_wait();
+	
+	if ((result = suspend_rw_buffer(READ, (char *) index,
+			sizeof(unsigned long)))) {
+		abort_suspend(SUSPEND_FAILED_IO,
+				"Read of index returned %d.\n", result);
+		goto out;
+	}
+
+	if ((result = suspend_rw_buffer(READ, (char *) buf_size, sizeof(int)))) {
+		abort_suspend(SUSPEND_FAILED_IO,
+				"Read of buffer size is %d.\n", result);
+		goto out;
+	}
+
+	result = suspend_rw_buffer(READ, buffer_virt, *buf_size);
+	if (result)
+		abort_suspend(SUSPEND_FAILED_IO,
+				"Read of data returned %d.\n", result);
+
+	PR_DEBUG("%d: Index %ld, %d bytes.\n", pr_index, *index, *buf_size);
+out:
+	mutex_unlock(&suspend_bio_mutex);
+	kunmap(buffer_page);
+	if (result)
+		abort_suspend(SUSPEND_FAILED_IO,
+			"Returning %d from suspend_bio_read_chunk.\n", result);
+	return result;
+}
+
+/*
+ * suspend_bio_write_chunk
+ *
+ * Write a (possibly compressed and/or encrypted) page to the image from
+ * the buffer, together with it's index and buffer size.
+ */
+
+static int suspend_bio_write_chunk(unsigned long index, struct page *buffer_page,
+		unsigned int buf_size)
+{
+	int result;
+	char *buffer_virt = kmap(buffer_page);
+
+	pr_index++;
+
+	while (!mutex_trylock(&suspend_bio_mutex))
+		do_bio_wait();
+	
+	if ((result = suspend_rw_buffer(WRITE, (char *) &index,
+					sizeof(unsigned long))))
+		goto out;
+
+	if ((result = suspend_rw_buffer(WRITE, (char *) &buf_size, sizeof(int))))
+		goto out;
+
+	result = suspend_rw_buffer(WRITE, buffer_virt, buf_size);
+
+	PR_DEBUG("%d: Index %ld, %d bytes.\n", pr_index, index, buf_size);
+out:
+	mutex_unlock(&suspend_bio_mutex);
+	kunmap(buffer_page);
+	return result;
+}
+
+/*
+ * suspend_rw_header_chunk
+ *
+ * Read or write a portion of the header.
+ */
+
+static int suspend_rw_header_chunk(int writing,
+		struct suspend_module_ops *owner,
+		char *buffer, int buffer_size)
+{
+	if (owner) {
+		owner->header_used += buffer_size;
+		if (owner->header_used > owner->header_requested) {
+			printk(KERN_EMERG "Suspend2 module %s is using more"
+				"header space (%u) than it requested (%u).\n",
+				owner->name,
+				owner->header_used,
+				owner->header_requested);
+			return buffer_size;
+		}
+	}
+
+	return suspend_rw_buffer(writing, buffer, buffer_size);
+}
+
+/*
+ * write_header_chunk_finish
+ *
+ * Flush any buffered writes in the section of the image.
+ */
+static int write_header_chunk_finish(void)
+{
+	return suspend_bio_rw_page(WRITE, virt_to_page(suspend_writer_buffer),
+		-1, 0) ? -EIO : 0;
+}
+
+static int suspend_bio_storage_needed(void)
+{
+	return 2 * sizeof(int);
+}
+
+static int suspend_bio_save_config_info(char *buf)
+{
+	int *ints = (int *) buf;
+	ints[0] = max_outstanding_io;
+	ints[1] = submit_batch_size;
+	return 2 * sizeof(int);
+}
+
+static void suspend_bio_load_config_info(char *buf, int size)
+{
+	int *ints = (int *) buf;
+	max_outstanding_io  = ints[0];
+	submit_batch_size = ints[1];
+}
+
+static int suspend_bio_initialise(int starting_cycle)
+{
+	suspend_writer_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+
+	return suspend_writer_buffer ? 0 : -ENOMEM;
+}
+
+static void suspend_bio_cleanup(int finishing_cycle)
+{
+	if (suspend_writer_buffer) {
+		free_page((unsigned long) suspend_writer_buffer);
+		suspend_writer_buffer = NULL;
+	}
+}
+
+struct suspend_bio_ops suspend_bio_ops = {
+	.bdev_page_io = suspend_bdev_page_io,
+	.finish_all_io = suspend_finish_all_io,
+	.forward_one_page = forward_one_page,
+	.set_extra_page_forward = set_extra_page_forward,
+	.set_devinfo = suspend_set_devinfo,
+	.read_chunk = suspend_bio_read_chunk,
+	.write_chunk = suspend_bio_write_chunk,
+	.rw_init = suspend_rw_init,
+	.rw_cleanup = suspend_rw_cleanup,
+	.read_header_init = suspend_read_header_init,
+	.rw_header_chunk = suspend_rw_header_chunk,
+	.write_header_chunk_finish = write_header_chunk_finish,
+};
+
+static struct suspend_sysfs_data sysfs_params[] = {
+	{ SUSPEND2_ATTR("max_outstanding_io", SYSFS_RW),
+	  SYSFS_INT(&max_outstanding_io, 16, MAX_OUTSTANDING_IO, 0),
+	},
+
+	{ SUSPEND2_ATTR("submit_batch_size", SYSFS_RW),
+	  SYSFS_INT(&submit_batch_size, 16, SUBMIT_BATCH_SIZE, 0),
+	}
+};
+
+static struct suspend_module_ops suspend_blockwriter_ops = 
+{
+	.name					= "Block I/O",
+	.type					= MISC_MODULE,
+	.directory				= "block_io",
+	.module					= THIS_MODULE,
+	.memory_needed				= suspend_bio_memory_needed,
+	.storage_needed				= suspend_bio_storage_needed,
+	.save_config_info			= suspend_bio_save_config_info,
+	.load_config_info			= suspend_bio_load_config_info,
+	.initialise				= suspend_bio_initialise,
+	.cleanup				= suspend_bio_cleanup,
+
+	.sysfs_data		= sysfs_params,
+	.num_sysfs_entries	= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+static __init int suspend_block_io_load(void)
+{
+	return suspend_register_module(&suspend_blockwriter_ops);
+}
+
+#ifdef CONFIG_SUSPEND2_FILE_EXPORTS
+EXPORT_SYMBOL_GPL(suspend_read_fd);
+#endif
+#if defined(CONFIG_SUSPEND2_FILE_EXPORTS) || defined(CONFIG_SUSPEND2_SWAP_EXPORTS)
+EXPORT_SYMBOL_GPL(suspend_writer_posn);
+EXPORT_SYMBOL_GPL(suspend_writer_posn_save);
+EXPORT_SYMBOL_GPL(suspend_writer_buffer);
+EXPORT_SYMBOL_GPL(suspend_writer_buffer_posn);
+EXPORT_SYMBOL_GPL(suspend_header_bytes_used);
+EXPORT_SYMBOL_GPL(suspend_bio_ops);
+#endif
+#ifdef MODULE
+static __exit void suspend_block_io_unload(void)
+{
+	suspend_unregister_module(&suspend_blockwriter_ops);
+}
+
+module_init(suspend_block_io_load);
+module_exit(suspend_block_io_unload);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Suspend2 block io functions");
+#else
+late_initcall(suspend_block_io_load);
+#endif
diff --git a/kernel/power/suspend_compress.c b/kernel/power/suspend_compress.c
new file mode 100644
index 0000000..6e70e33
--- /dev/null
+++ b/kernel/power/suspend_compress.c
@@ -0,0 +1,436 @@
+/*
+ * kernel/power/compression.c
+ *
+ * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains data compression routines for suspend,
+ * using cryptoapi.
+ */
+
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <linux/highmem.h>
+#include <linux/vmalloc.h>
+#include <linux/crypto.h>
+
+#include "suspend2_builtin.h"
+#include "suspend.h"
+#include "modules.h"
+#include "sysfs.h"
+#include "io.h"
+#include "ui.h"
+
+static int suspend_expected_compression = 0;
+
+static struct suspend_module_ops suspend_compression_ops;
+static struct suspend_module_ops *next_driver;
+
+static char suspend_compressor_name[32] = "lzf";
+
+static DEFINE_MUTEX(stats_lock);
+
+struct cpu_context {
+	u8 * page_buffer;
+	struct crypto_comp *transform;
+	unsigned int len;
+	char *buffer_start;
+};
+
+static DEFINE_PER_CPU(struct cpu_context, contexts);
+
+static int suspend_compress_prepare_result;
+
+/* 
+ * suspend_compress_cleanup
+ *
+ * Frees memory allocated for our labours.
+ */
+static void suspend_compress_cleanup(int suspend_or_resume)
+{
+	int cpu;
+
+	if (!suspend_or_resume)
+		return;
+
+	for_each_online_cpu(cpu) {
+		struct cpu_context *this = &per_cpu(contexts, cpu);
+		if (this->transform) {
+			crypto_free_comp(this->transform);
+			this->transform = NULL;
+		}
+
+		if (this->page_buffer)
+			free_page((unsigned long) this->page_buffer);
+
+		this->page_buffer = NULL;
+	}
+}
+
+/* 
+ * suspend_crypto_prepare
+ *
+ * Prepare to do some work by allocating buffers and transforms.
+ */
+static int suspend_compress_crypto_prepare(void)
+{
+	int cpu;
+
+	if (!*suspend_compressor_name) {
+		printk("Suspend2: Compression enabled but no compressor name set.\n");
+		return 1;
+	}
+
+	for_each_online_cpu(cpu) {
+		struct cpu_context *this = &per_cpu(contexts, cpu);
+		this->transform = crypto_alloc_comp(suspend_compressor_name,
+				0, 0);
+		if (IS_ERR(this->transform)) {
+			printk("Suspend2: Failed to initialise the %s "
+					"compression transform.\n",
+					suspend_compressor_name);
+			this->transform = NULL;
+			return 1;
+		}
+
+		this->page_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+	
+		if (!this->page_buffer) {
+			printk(KERN_ERR
+			  "Failed to allocate a page buffer for suspend2 "
+			  "encryption driver.\n");
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * suspend_compress_init
+ */
+
+static int suspend_compress_init(int suspend_or_resume)
+{
+	if (!suspend_or_resume)
+		return 0;
+
+	suspend_compress_bytes_in = suspend_compress_bytes_out = 0;
+
+	next_driver = suspend_get_next_filter(&suspend_compression_ops);
+
+	if (!next_driver) {
+		printk("Compression Driver: Argh! Nothing follows me in"
+				" the pipeline!\n");
+		return -ECHILD;
+	}
+
+	suspend_compress_prepare_result = suspend_compress_crypto_prepare();
+
+	return 0;
+}
+
+/*
+ * suspend_compress_rw_init()
+ */
+
+int suspend_compress_rw_init(int rw, int stream_number)
+{
+	if (suspend_compress_prepare_result) {
+		printk("Failed to initialise compression algorithm.\n");
+		if (rw == READ)
+			return -ENODEV;
+		else
+			suspend_compression_ops.enabled = 0;
+	}
+
+	return 0;
+}
+
+/* 
+ * suspend_compress_write_chunk()
+ *
+ * Compress a page of data, buffering output and passing on filled
+ * pages to the next module in the pipeline.
+ * 
+ * Buffer_page:	Pointer to a buffer of size PAGE_SIZE, containing
+ * data to be compressed.
+ *
+ * Returns:	0 on success. Otherwise the error is that returned by later
+ * 		modules, -ECHILD if we have a broken pipeline or -EIO if
+ * 		zlib errs.
+ */
+static int suspend_compress_write_chunk(unsigned long index,
+		struct page *buffer_page, unsigned int buf_size)
+{
+	int ret, cpu = smp_processor_id();
+	struct cpu_context *ctx = &per_cpu(contexts, cpu);
+	
+	if (!ctx->transform)
+		return next_driver->write_chunk(index, buffer_page, buf_size);
+
+	ctx->buffer_start = kmap(buffer_page);
+
+	ctx->len = buf_size;
+
+	ret = crypto_comp_compress(ctx->transform,
+			ctx->buffer_start, buf_size,
+			ctx->page_buffer, &ctx->len);
+	
+	kunmap(buffer_page);
+
+	if (ret) {
+		printk("Compression failed.\n");
+		goto failure;
+	}
+	
+	mutex_lock(&stats_lock);
+	suspend_compress_bytes_in += buf_size;
+	suspend_compress_bytes_out += ctx->len;
+	mutex_unlock(&stats_lock);
+
+	if (ctx->len < buf_size) /* some compression */
+		ret = next_driver->write_chunk(index,
+				virt_to_page(ctx->page_buffer),
+				ctx->len);
+	else
+		ret = next_driver->write_chunk(index, buffer_page, buf_size);
+
+failure:
+	return ret;
+}
+
+/* 
+ * suspend_compress_read_chunk()
+ * @buffer_page: struct page *. Pointer to a buffer of size PAGE_SIZE.
+ * @sync:	int. Whether the previous module (or core) wants its data
+ * 		synchronously.
+ *
+ * Retrieve data from later modules and decompress it until the input buffer
+ * is filled.
+ * Zero if successful. Error condition from me or from downstream on failure.
+ */
+static int suspend_compress_read_chunk(unsigned long *index,
+		struct page *buffer_page, unsigned int *buf_size, int sync)
+{
+	int ret, cpu = smp_processor_id(); 
+	unsigned int len;
+	unsigned int outlen = PAGE_SIZE;
+	char *buffer_start;
+	struct cpu_context *ctx = &per_cpu(contexts, cpu);
+
+	if (!ctx->transform)
+		return next_driver->read_chunk(index, buffer_page, buf_size,
+				sync);
+
+	/* 
+	 * All our reads must be synchronous - we can't decompress
+	 * data that hasn't been read yet.
+	 */
+
+	*buf_size = PAGE_SIZE;
+
+	ret = next_driver->read_chunk(index, buffer_page, &len, SUSPEND_SYNC);
+
+	/* Error or uncompressed data */
+	if (ret || len == PAGE_SIZE)
+		return ret;
+
+	buffer_start = kmap(buffer_page);
+	memcpy(ctx->page_buffer, buffer_start, len);
+	ret = crypto_comp_decompress(
+			ctx->transform,
+			ctx->page_buffer,
+			len, buffer_start, &outlen);
+	if (ret)
+		abort_suspend(SUSPEND_FAILED_IO,
+			"Compress_read returned %d.\n", ret);
+	else if (outlen != PAGE_SIZE) {
+		abort_suspend(SUSPEND_FAILED_IO,
+			"Decompression yielded %d bytes instead of %ld.\n",
+			outlen, PAGE_SIZE);
+		ret = -EIO;
+		*buf_size = outlen;
+	}
+	kunmap(buffer_page);
+	return ret;
+}
+
+/* 
+ * suspend_compress_print_debug_stats
+ * @buffer: Pointer to a buffer into which the debug info will be printed.
+ * @size: Size of the buffer.
+ *
+ * Print information to be recorded for debugging purposes into a buffer.
+ * Returns: Number of characters written to the buffer.
+ */
+
+static int suspend_compress_print_debug_stats(char *buffer, int size)
+{
+	int pages_in = suspend_compress_bytes_in >> PAGE_SHIFT, 
+	    pages_out = suspend_compress_bytes_out >> PAGE_SHIFT;
+	int len;
+	
+	/* Output the compression ratio achieved. */
+	if (*suspend_compressor_name)
+		len = snprintf_used(buffer, size, "- Compressor is '%s'.\n",
+				suspend_compressor_name);
+	else
+		len = snprintf_used(buffer, size, "- Compressor is not set.\n");
+
+	if (pages_in)
+		len+= snprintf_used(buffer+len, size - len,
+		  "  Compressed %ld bytes into %ld (%d percent compression).\n",
+		  suspend_compress_bytes_in,
+		  suspend_compress_bytes_out,
+		  (pages_in - pages_out) * 100 / pages_in);
+	return len;
+}
+
+/* 
+ * suspend_compress_compression_memory_needed
+ *
+ * Tell the caller how much memory we need to operate during suspend/resume.
+ * Returns: Unsigned long. Maximum number of bytes of memory required for
+ * operation.
+ */
+static int suspend_compress_memory_needed(void)
+{
+	return 2 * PAGE_SIZE;
+}
+
+static int suspend_compress_storage_needed(void)
+{
+	return 4 * sizeof(unsigned long) + strlen(suspend_compressor_name) + 1;
+}
+
+/* 
+ * suspend_compress_save_config_info
+ * @buffer: Pointer to a buffer of size PAGE_SIZE.
+ *
+ * Save informaton needed when reloading the image at resume time.
+ * Returns: Number of bytes used for saving our data.
+ */
+static int suspend_compress_save_config_info(char *buffer)
+{
+	int namelen = strlen(suspend_compressor_name) + 1;
+	int total_len;
+	
+	*((unsigned long *) buffer) = suspend_compress_bytes_in;
+	*((unsigned long *) (buffer + 1 * sizeof(unsigned long))) =
+		suspend_compress_bytes_out;
+	*((unsigned long *) (buffer + 2 * sizeof(unsigned long))) =
+		suspend_expected_compression;
+	*((unsigned long *) (buffer + 3 * sizeof(unsigned long))) = namelen;
+	strncpy(buffer + 4 * sizeof(unsigned long), suspend_compressor_name, 
+								namelen);
+	total_len = 4 * sizeof(unsigned long) + namelen;
+	return total_len;
+}
+
+/* suspend_compress_load_config_info
+ * @buffer: Pointer to the start of the data.
+ * @size: Number of bytes that were saved.
+ *
+ * Description:	Reload information needed for decompressing the image at
+ * resume time.
+ */
+static void suspend_compress_load_config_info(char *buffer, int size)
+{
+	int namelen;
+	
+	suspend_compress_bytes_in = *((unsigned long *) buffer);
+	suspend_compress_bytes_out = *((unsigned long *) (buffer + 1 * sizeof(unsigned long)));
+	suspend_expected_compression = *((unsigned long *) (buffer + 2 *
+				sizeof(unsigned long)));
+	namelen = *((unsigned long *) (buffer + 3 * sizeof(unsigned long)));
+	strncpy(suspend_compressor_name, buffer + 4 * sizeof(unsigned long),
+			namelen);
+	return;
+}
+
+/* 
+ * suspend_expected_compression_ratio
+ * 
+ * Description:	Returns the expected ratio between data passed into this module
+ * 		and the amount of data output when writing.
+ * Returns:	100 if the module is disabled. Otherwise the value set by the
+ * 		user via our sysfs entry.
+ */
+
+static int suspend_compress_expected_ratio(void)
+{
+	if (!suspend_compression_ops.enabled)
+		return 100;
+	else
+		return 100 - suspend_expected_compression;
+}
+
+/*
+ * data for our sysfs entries.
+ */
+static struct suspend_sysfs_data sysfs_params[] = {
+	{
+		SUSPEND2_ATTR("expected_compression", SYSFS_RW),
+		SYSFS_INT(&suspend_expected_compression, 0, 99, 0)
+	},
+
+	{
+		SUSPEND2_ATTR("enabled", SYSFS_RW),
+		SYSFS_INT(&suspend_compression_ops.enabled, 0, 1, 0)
+	},
+
+	{
+		SUSPEND2_ATTR("algorithm", SYSFS_RW),
+		SYSFS_STRING(suspend_compressor_name, 31, 0)
+	}
+};
+
+/*
+ * Ops structure.
+ */
+static struct suspend_module_ops suspend_compression_ops = {
+	.type			= FILTER_MODULE,
+	.name			= "Compressor",
+	.directory		= "compression",
+	.module			= THIS_MODULE,
+	.initialise		= suspend_compress_init,
+	.cleanup		= suspend_compress_cleanup,
+	.memory_needed 		= suspend_compress_memory_needed,
+	.print_debug_info	= suspend_compress_print_debug_stats,
+	.save_config_info	= suspend_compress_save_config_info,
+	.load_config_info	= suspend_compress_load_config_info,
+	.storage_needed		= suspend_compress_storage_needed,
+	.expected_compression	= suspend_compress_expected_ratio,
+	
+	.rw_init		= suspend_compress_rw_init,
+
+	.write_chunk		= suspend_compress_write_chunk,
+	.read_chunk		= suspend_compress_read_chunk,
+
+	.sysfs_data		= sysfs_params,
+	.num_sysfs_entries	= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+/* ---- Registration ---- */
+
+static __init int suspend_compress_load(void)
+{
+	return suspend_register_module(&suspend_compression_ops);
+}
+
+#ifdef MODULE
+static __exit void suspend_compress_unload(void)
+{
+	suspend_unregister_module(&suspend_compression_ops);
+}
+
+module_init(suspend_compress_load);
+module_exit(suspend_compress_unload);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Compression Support for Suspend2");
+#else
+late_initcall(suspend_compress_load);
+#endif
diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c
new file mode 100644
index 0000000..e523f8b
--- /dev/null
+++ b/kernel/power/suspend_file.c
@@ -0,0 +1,1131 @@
+/*
+ * kernel/power/suspend_file.c
+ *
+ * Copyright (C) 2005-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * Distributed under GPLv2.
+ * 
+ * This file encapsulates functions for usage of a simple file as a
+ * backing store. It is based upon the swapallocator, and shares the
+ * same basic working. Here, though, we have nothing to do with
+ * swapspace, and only one device to worry about.
+ *
+ * The user can just
+ *
+ * echo Suspend2 > /path/to/my_file
+ *
+ * and
+ *
+ * echo /path/to/my_file > /sys/power/suspend2/suspend_file/target
+ *
+ * then put what they find in /sys/power/suspend2/resume2
+ * as their resume2= parameter in lilo.conf (and rerun lilo if using it).
+ *
+ * Having done this, they're ready to suspend and resume.
+ *
+ * TODO:
+ * - File resizing.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/mount.h>
+#include <linux/statfs.h>
+#include <linux/syscalls.h>
+#include <linux/namei.h>
+#include <linux/fs.h>
+#include <linux/root_dev.h>
+
+#include "suspend.h"
+#include "sysfs.h"
+#include "modules.h"
+#include "ui.h"
+#include "extent.h"
+#include "io.h"
+#include "storage.h"
+#include "block_io.h"
+
+static struct suspend_module_ops suspend_fileops;
+
+/* Details of our target.  */
+
+char suspend_file_target[256];
+static struct inode *target_inode;
+static struct file *target_file;
+static struct block_device *suspend_file_target_bdev;
+static dev_t resume_file_dev_t;
+static int used_devt = 0;
+static int setting_suspend_file_target = 0;
+static sector_t target_firstblock = 0, target_header_start = 0;
+static int target_storage_available = 0;
+static int target_claim = 0;
+
+static char HaveImage[] = "HaveImage\n";
+static char NoImage[] =   "Suspend2\n";
+#define sig_size (sizeof(HaveImage) + 1)
+
+struct suspend_file_header {
+	char sig[sig_size];
+	int resumed_before;
+	unsigned long first_header_block;
+};
+
+extern char *__initdata root_device_name;
+
+/* Header Page Information */
+static int header_pages_allocated;
+
+/* Main Storage Pages */
+static int main_pages_allocated, main_pages_requested;
+
+#define target_is_normal_file() (S_ISREG(target_inode->i_mode))
+
+static struct suspend_bdev_info devinfo;
+
+/* Extent chain for blocks */
+static struct extent_chain block_chain;
+
+/* Signature operations */
+enum {
+	GET_IMAGE_EXISTS,
+	INVALIDATE,
+	MARK_RESUME_ATTEMPTED,
+	UNMARK_RESUME_ATTEMPTED,
+};
+
+static void set_devinfo(struct block_device *bdev, int target_blkbits)
+{
+	devinfo.bdev = bdev;
+	if (!target_blkbits) {
+		devinfo.bmap_shift = devinfo.blocks_per_page = 0;
+	} else {
+		devinfo.bmap_shift = target_blkbits - 9;
+		devinfo.blocks_per_page = (1 << (PAGE_SHIFT - target_blkbits));
+	}
+}
+
+static int adjust_for_extra_pages(int unadjusted)
+{
+	return (unadjusted << PAGE_SHIFT) / (PAGE_SIZE + sizeof(unsigned long)
+			+ sizeof(int));
+}
+
+static int suspend_file_storage_available(void)
+{
+	int result = 0;
+	struct block_device *bdev=suspend_file_target_bdev;
+
+	if (!target_inode)
+		return 0;
+
+	switch (target_inode->i_mode & S_IFMT) {
+		case S_IFSOCK:
+		case S_IFCHR:
+		case S_IFIFO: /* Socket, Char, Fifo */
+			return -1;
+		case S_IFREG: /* Regular file: current size - holes + free
+				 space on part */
+			result = target_storage_available;
+			break;
+		case S_IFBLK: /* Block device */
+			if (!bdev->bd_disk) {
+				printk("bdev->bd_disk null.\n");
+				return 0;
+			}
+
+			result = (bdev->bd_part ?
+				bdev->bd_part->nr_sects :
+				bdev->bd_disk->capacity) >> (PAGE_SHIFT - 9);
+	}
+
+	return adjust_for_extra_pages(result);
+}
+
+static int has_contiguous_blocks(int page_num)
+{
+	int j;
+	sector_t last = 0;
+
+	for (j = 0; j < devinfo.blocks_per_page; j++) {
+		sector_t this = bmap(target_inode,
+				page_num * devinfo.blocks_per_page + j);
+
+		if (!this || (last && (last + 1) != this))
+			break;
+
+		last = this;
+	}
+			
+	return (j == devinfo.blocks_per_page);
+}
+
+static int size_ignoring_ignored_pages(void)
+{
+	int mappable = 0, i;
+	
+	if (!target_is_normal_file())
+		return suspend_file_storage_available();
+
+	for (i = 0; i < (target_inode->i_size >> PAGE_SHIFT) ; i++)
+		if (has_contiguous_blocks(i))
+			mappable++;
+	
+	return mappable;
+}
+
+static void __populate_block_list(int min, int max)
+{
+	if (test_action_state(SUSPEND_TEST_BIO))
+		printk("Adding extent %d-%d.\n", min << devinfo.bmap_shift,
+		        ((max + 1) << devinfo.bmap_shift) - 1);
+
+	suspend_add_to_extent_chain(&block_chain, min, max);
+}
+
+static void populate_block_list(void)
+{
+	int i;
+	int extent_min = -1, extent_max = -1, got_header = 0;
+	
+	if (block_chain.first)
+		suspend_put_extent_chain(&block_chain);
+
+	if (!target_is_normal_file()) {
+		if (target_storage_available > 0)
+			__populate_block_list(devinfo.blocks_per_page, 
+				(target_storage_available + 1) *
+			 	devinfo.blocks_per_page - 1);
+		return;
+	}
+
+	for (i = 0; i < (target_inode->i_size >> PAGE_SHIFT); i++) {
+		sector_t new_sector;
+
+		if (!has_contiguous_blocks(i))
+			continue;
+
+		new_sector = bmap(target_inode,
+		(i * devinfo.blocks_per_page));
+
+		/* 
+		 * Ignore the first block in the file.
+		 * It gets the header.
+		 */
+		if (new_sector == target_firstblock >> devinfo.bmap_shift) {
+			got_header = 1;
+			continue;
+		}
+
+		/* 
+		 * I'd love to be able to fill in holes and resize 
+		 * files, but not yet...
+		 */
+
+		if (new_sector == extent_max + 1)
+			extent_max+= devinfo.blocks_per_page;
+		else {
+			if (extent_min > -1)
+				__populate_block_list(extent_min,
+						extent_max);
+
+			extent_min = new_sector;
+			extent_max = extent_min +
+				devinfo.blocks_per_page - 1;
+		}
+	}
+
+	if (extent_min > -1)
+		__populate_block_list(extent_min, extent_max);
+}
+
+static void suspend_file_cleanup(int finishing_cycle)
+{
+	if (suspend_file_target_bdev) {
+		if (target_claim) {
+			bd_release(suspend_file_target_bdev);
+			target_claim = 0;
+		}
+
+		if (used_devt) {
+			blkdev_put(suspend_file_target_bdev);
+			used_devt = 0;
+		}
+		suspend_file_target_bdev = NULL;
+		target_inode = NULL;
+		set_devinfo(NULL, 0);
+		target_storage_available = 0;
+	}
+
+	if (target_file > 0) {
+		filp_close(target_file, NULL);
+		target_file = NULL;
+	}
+}
+
+/* 
+ * reopen_resume_devt
+ *
+ * Having opened resume2= once, we remember the major and
+ * minor nodes and use them to reopen the bdev for checking
+ * whether an image exists (possibly when starting a resume).
+ */
+static void reopen_resume_devt(void)
+{
+	suspend_file_target_bdev = open_by_devnum(resume_file_dev_t, FMODE_READ);
+	if (IS_ERR(suspend_file_target_bdev)) {
+		printk("Got a dev_num (%lx) but failed to open it.\n",
+				(unsigned long) resume_file_dev_t);
+		return;
+	}
+	target_inode = suspend_file_target_bdev->bd_inode;
+	set_devinfo(suspend_file_target_bdev, target_inode->i_blkbits);
+}
+
+static void suspend_file_get_target_info(char *target, int get_size,
+		int resume2)
+{
+	if (target_file)
+		suspend_file_cleanup(0);
+
+	if (!target || !strlen(target))
+		return;
+
+	target_file = filp_open(target, O_RDWR, 0);
+
+	if (IS_ERR(target_file) || !target_file) {
+
+		if (!resume2) {
+			printk("Open file %s returned %p.\n",
+					target, target_file);
+			target_file = NULL;
+			return;
+		}
+
+		target_file = NULL;
+		resume_file_dev_t = name_to_dev_t(target);
+		if (!resume_file_dev_t) {
+			struct kstat stat;
+			int error = vfs_stat(target, &stat);
+			printk("Open file %s returned %p and name_to_devt "
+					"failed.\n", target, target_file);
+			if (error)
+				printk("Stating the file also failed."
+					" Nothing more we can do.\n");
+			else
+				resume_file_dev_t = stat.rdev;
+			return;
+		}
+
+	     	suspend_file_target_bdev = open_by_devnum(resume_file_dev_t,
+				FMODE_READ);
+		if (IS_ERR(suspend_file_target_bdev)) {
+			printk("Got a dev_num (%lx) but failed to open it.\n",
+					(unsigned long) resume_file_dev_t);
+			return;
+		}
+		used_devt = 1;
+		target_inode = suspend_file_target_bdev->bd_inode;
+	} else
+		target_inode = target_file->f_mapping->host;
+
+	if (S_ISLNK(target_inode->i_mode) || S_ISDIR(target_inode->i_mode) ||
+	    S_ISSOCK(target_inode->i_mode) || S_ISFIFO(target_inode->i_mode)) {
+		printk("File support works with regular files, character "
+				"files and block devices.\n");
+		goto cleanup;
+	}
+
+	if (!used_devt) {
+		if (S_ISBLK(target_inode->i_mode)) {
+			suspend_file_target_bdev = I_BDEV(target_inode);
+			if (!bd_claim(suspend_file_target_bdev, &suspend_fileops))
+				target_claim = 1;
+		} else
+			suspend_file_target_bdev = target_inode->i_sb->s_bdev;
+		resume_file_dev_t = suspend_file_target_bdev->bd_dev;
+	}
+
+	set_devinfo(suspend_file_target_bdev, target_inode->i_blkbits);
+
+	if (get_size)
+		target_storage_available = size_ignoring_ignored_pages();
+
+	if (!resume2)
+		target_firstblock = bmap(target_inode, 0) << devinfo.bmap_shift;
+	
+	return;
+cleanup:
+	target_inode = NULL;
+	if (target_file) {
+		filp_close(target_file, NULL);
+		target_file = NULL;
+	}
+	set_devinfo(NULL, 0);
+	target_storage_available = 0;
+}
+
+static int parse_signature(struct suspend_file_header *header)
+{
+	int have_image = !memcmp(HaveImage, header->sig, sizeof(HaveImage) - 1);
+	int no_image_header = !memcmp(NoImage, header->sig, sizeof(NoImage) - 1);
+
+	if (no_image_header)
+		return 0;
+
+	if (!have_image)
+		return -1;
+
+	if (header->resumed_before)
+		set_suspend_state(SUSPEND_RESUMED_BEFORE);
+	else
+		clear_suspend_state(SUSPEND_RESUMED_BEFORE);
+
+	target_header_start = header->first_header_block;
+	return 1;
+}
+
+/* prepare_signature */
+
+static int prepare_signature(struct suspend_file_header *current_header,
+		unsigned long first_header_block)
+{
+	strncpy(current_header->sig, HaveImage, sizeof(HaveImage));
+	current_header->resumed_before = 0;
+	current_header->first_header_block = first_header_block;
+	return 0;
+}
+
+static int suspend_file_storage_allocated(void)
+{
+	if (!target_inode)
+		return 0;
+
+	if (target_is_normal_file())
+		return (int) target_storage_available;
+	else
+		return header_pages_allocated + main_pages_requested;
+}
+
+static int suspend_file_release_storage(void)
+{
+	if (test_action_state(SUSPEND_KEEP_IMAGE) &&
+	    test_suspend_state(SUSPEND_NOW_RESUMING))
+		return 0;
+
+	suspend_put_extent_chain(&block_chain);
+
+	header_pages_allocated = 0;
+	main_pages_allocated = 0;
+	main_pages_requested = 0;
+	return 0;
+}
+
+static int __suspend_file_allocate_storage(int main_storage_requested,
+		int header_storage);
+
+static int suspend_file_allocate_header_space(int space_requested)
+{
+	int i;
+
+	if (!block_chain.first && __suspend_file_allocate_storage(
+				main_pages_requested, space_requested)) {
+		printk("Failed to allocate space for the header.\n");
+		return -ENOSPC;
+	}
+
+	suspend_extent_state_goto_start(&suspend_writer_posn);
+	suspend_bio_ops.forward_one_page(); /* To first page */
+
+	for (i = 0; i < space_requested; i++) {
+		if (suspend_bio_ops.forward_one_page()) {
+			printk("Out of space while seeking to allocate "
+					"header pages,\n");
+			header_pages_allocated = i;
+			return -ENOSPC;
+		}
+	}
+
+	header_pages_allocated = space_requested;
+
+	/* The end of header pages will be the start of pageset 2 */
+	suspend_extent_state_save(&suspend_writer_posn,
+			&suspend_writer_posn_save[2]);
+	return 0;
+}
+
+static int suspend_file_allocate_storage(int space_requested)
+{
+	if (__suspend_file_allocate_storage(space_requested,
+				header_pages_allocated))
+		return -ENOSPC;
+
+	main_pages_requested = space_requested;
+	return -ENOSPC;
+}
+
+static int __suspend_file_allocate_storage(int main_space_requested,
+		int header_space_requested)
+{
+	int result = 0;
+
+	int extra_pages = DIV_ROUND_UP(main_space_requested *
+			(sizeof(unsigned long) + sizeof(int)), PAGE_SIZE);
+	int pages_to_get = main_space_requested + extra_pages +
+		header_space_requested;
+	int blocks_to_get = pages_to_get - block_chain.size;
+	
+	/* Only release_storage reduces the size */
+	if (blocks_to_get < 1)
+		return 0;
+
+	populate_block_list();
+
+	suspend_message(SUSPEND_WRITER, SUSPEND_MEDIUM, 0,
+		"Finished with block_chain.size == %d.\n",
+		block_chain.size);
+
+	if (block_chain.size < pages_to_get) {
+		printk("Block chain size (%d) < header pages (%d) + extra pages (%d) + main pages (%d) (=%d pages).\n",
+			block_chain.size, header_pages_allocated, extra_pages,
+			main_space_requested, pages_to_get);
+		result = -ENOSPC;
+	}
+
+	main_pages_requested = main_space_requested;
+	main_pages_allocated = main_space_requested + extra_pages;
+
+	suspend_file_allocate_header_space(header_pages_allocated);
+	return result;
+}
+
+static int suspend_file_write_header_init(void)
+{
+	suspend_extent_state_goto_start(&suspend_writer_posn);
+
+	suspend_writer_buffer_posn = suspend_header_bytes_used = 0;
+
+	/* Info needed to bootstrap goes at the start of the header.
+	 * First we save the basic info needed for reading, including the number
+	 * of header pages. Then we save the structs containing data needed
+	 * for reading the header pages back.
+	 * Note that even if header pages take more than one page, when we
+	 * read back the info, we will have restored the location of the
+	 * next header page by the time we go to use it.
+	 */
+
+	suspend_bio_ops.rw_header_chunk(WRITE, &suspend_fileops,
+			(char *) &suspend_writer_posn_save, 
+			sizeof(suspend_writer_posn_save));
+
+	suspend_bio_ops.rw_header_chunk(WRITE, &suspend_fileops,
+			(char *) &devinfo, sizeof(devinfo));
+
+	suspend_serialise_extent_chain(&suspend_fileops, &block_chain);
+	
+	return 0;
+}
+
+static int suspend_file_write_header_cleanup(void)
+{
+	struct suspend_file_header *header;
+
+	/* Write any unsaved data */
+	if (suspend_writer_buffer_posn)
+		suspend_bio_ops.write_header_chunk_finish();
+
+	suspend_bio_ops.finish_all_io();
+
+	suspend_extent_state_goto_start(&suspend_writer_posn);
+	suspend_bio_ops.forward_one_page();
+
+	/* Adjust image header */
+	suspend_bio_ops.bdev_page_io(READ, suspend_file_target_bdev,
+			target_firstblock,
+			virt_to_page(suspend_writer_buffer));
+
+	header = (struct suspend_file_header *) suspend_writer_buffer;
+
+	prepare_signature(header,
+			suspend_writer_posn.current_offset <<
+			devinfo.bmap_shift);
+		
+	suspend_bio_ops.bdev_page_io(WRITE, suspend_file_target_bdev,
+			target_firstblock,
+			virt_to_page(suspend_writer_buffer));
+
+	suspend_bio_ops.finish_all_io();
+
+	return 0;
+}
+
+/* HEADER READING */
+
+#ifdef CONFIG_DEVFS_FS
+int  create_dev(char *name, dev_t dev, char *devfs_name);
+#else
+static int create_dev(char *name, dev_t dev, char *devfs_name)
+{
+	sys_unlink(name);
+	return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
+}
+#endif
+
+static int rd_init(void)
+{
+	suspend_writer_buffer_posn = 0;
+
+	create_dev("/dev/root", ROOT_DEV, root_device_name);
+	create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, 0), NULL);
+
+	suspend_read_fd = sys_open("/dev/root", O_RDONLY, 0);
+	if (suspend_read_fd < 0)
+		goto out;
+	
+	sys_read(suspend_read_fd, suspend_writer_buffer, BLOCK_SIZE);
+
+	memcpy(&suspend_writer_posn_save,
+		suspend_writer_buffer + suspend_writer_buffer_posn,
+		sizeof(suspend_writer_posn_save));
+	
+	suspend_writer_buffer_posn += sizeof(suspend_writer_posn_save);
+
+	return 0;
+out:
+	sys_unlink("/dev/ram");
+	sys_unlink("/dev/root");
+	return -EIO;
+}
+
+static int file_init(void)
+{
+	suspend_writer_buffer_posn = 0;
+
+	/* Read suspend_file configuration */
+	suspend_bio_ops.bdev_page_io(READ, suspend_file_target_bdev,
+			target_header_start,
+			virt_to_page((unsigned long) suspend_writer_buffer));
+	
+	return 0;
+}
+
+/*
+ * read_header_init()
+ * 
+ * Ramdisk support based heavily on init/do_mounts_rd.c
+ *
+ * Description:
+ * 1. Attempt to read the device specified with resume2=.
+ * 2. Check the contents of the header for our signature.
+ * 3. Warn, ignore, reset and/or continue as appropriate.
+ * 4. If continuing, read the suspend_file configuration section
+ *    of the header and set up block device info so we can read
+ *    the rest of the header & image.
+ *
+ * Returns:
+ * May not return if user choose to reboot at a warning.
+ * -EINVAL if cannot resume at this time. Booting should continue
+ * normally.
+ */
+
+static int suspend_file_read_header_init(void)
+{
+	int result;
+	struct block_device *tmp;
+
+	if (test_suspend_state(SUSPEND_TRY_RESUME_RD))
+		result = rd_init();
+	else
+		result = file_init();
+	
+	if (result) {
+		printk("FileAllocator read header init: Failed to initialise "
+				"reading the first page of data.\n");
+		return result;
+	}
+
+	memcpy(&suspend_writer_posn_save,
+	       suspend_writer_buffer + suspend_writer_buffer_posn,
+	       sizeof(suspend_writer_posn_save));
+	
+	suspend_writer_buffer_posn += sizeof(suspend_writer_posn_save);
+
+	tmp = devinfo.bdev;
+
+	memcpy(&devinfo,
+	       suspend_writer_buffer + suspend_writer_buffer_posn,
+	       sizeof(devinfo));
+
+	devinfo.bdev = tmp;
+	suspend_writer_buffer_posn += sizeof(devinfo);
+
+	suspend_bio_ops.read_header_init();
+	suspend_extent_state_goto_start(&suspend_writer_posn);
+	suspend_bio_ops.set_extra_page_forward();
+
+	suspend_header_bytes_used = suspend_writer_buffer_posn;
+
+	return suspend_load_extent_chain(&block_chain);
+}
+
+static int suspend_file_read_header_cleanup(void)
+{
+	suspend_bio_ops.rw_cleanup(READ);
+	return 0;
+}
+
+static int suspend_file_signature_op(int op)
+{
+	char *cur;
+	int result = 0, changed = 0;
+	struct suspend_file_header *header;
+	
+	if(suspend_file_target_bdev <= 0)
+		return -1;
+
+	cur = (char *) get_zeroed_page(GFP_ATOMIC);
+	if (!cur) {
+		printk("Unable to allocate a page for reading the image "
+				"signature.\n");
+		return -ENOMEM;
+	}
+
+	suspend_bio_ops.bdev_page_io(READ, suspend_file_target_bdev,
+			target_firstblock,
+			virt_to_page(cur));
+
+	header = (struct suspend_file_header *) cur;
+	result = parse_signature(header);
+		
+	switch (op) {
+		case INVALIDATE:
+			if (result == -1)
+				goto out;
+
+			strcpy(header->sig, NoImage);
+			header->resumed_before = 0;
+			result = changed = 1;
+			break;
+		case MARK_RESUME_ATTEMPTED:
+			if (result == 1) {
+				header->resumed_before = 1;
+				changed = 1;
+			}
+			break;
+		case UNMARK_RESUME_ATTEMPTED:
+			if (result == 1) {
+				header->resumed_before = 0;
+				changed = 1;
+			}
+			break;
+	}
+
+	if (changed)
+		suspend_bio_ops.bdev_page_io(WRITE, suspend_file_target_bdev,
+				target_firstblock,
+				virt_to_page(cur));
+
+out:
+	suspend_bio_ops.finish_all_io();
+	free_page((unsigned long) cur);
+	return result;
+}
+
+/* Print debug info
+ *
+ * Description:
+ */
+
+static int suspend_file_print_debug_stats(char *buffer, int size)
+{
+	int len = 0;
+	
+	if (suspendActiveAllocator != &suspend_fileops) {
+		len = snprintf_used(buffer, size, "- FileAllocator inactive.\n");
+		return len;
+	}
+
+	len = snprintf_used(buffer, size, "- FileAllocator active.\n");
+
+	len+= snprintf_used(buffer+len, size-len, "  Storage available for image: "
+			"%ld pages.\n",
+			suspend_file_storage_allocated());
+
+	return len;
+}
+
+/*
+ * Storage needed
+ *
+ * Returns amount of space in the image header required
+ * for the suspend_file's data.
+ *
+ * We ensure the space is allocated, but actually save the
+ * data from write_header_init and therefore don't also define a
+ * save_config_info routine.
+ */
+static int suspend_file_storage_needed(void)
+{
+	return sig_size + strlen(suspend_file_target) + 1 +
+		3 * sizeof(struct extent_iterate_saved_state) +
+		sizeof(devinfo) +
+		sizeof(struct extent_chain) - 2 * sizeof(void *) +
+		(2 * sizeof(unsigned long) * block_chain.num_extents);
+}
+
+/* 
+ * suspend_file_invalidate_image
+ * 
+ */
+static int suspend_file_invalidate_image(void)
+{
+	int result;
+
+	suspend_file_release_storage();
+
+	result = suspend_file_signature_op(INVALIDATE);
+	if (result == 1 && !nr_suspends)
+		printk(KERN_WARNING "Suspend2: Image invalidated.\n");
+
+	return result;
+}
+
+/*
+ * Image_exists
+ *
+ */
+
+static int suspend_file_image_exists(void)
+{
+	if (!suspend_file_target_bdev)
+		reopen_resume_devt();
+
+	return suspend_file_signature_op(GET_IMAGE_EXISTS);
+}
+
+/*
+ * Mark resume attempted.
+ *
+ * Record that we tried to resume from this image.
+ */
+
+static void suspend_file_mark_resume_attempted(int mark)
+{
+	suspend_file_signature_op(mark ? MARK_RESUME_ATTEMPTED:
+		UNMARK_RESUME_ATTEMPTED);
+}
+
+static void suspend_file_set_resume2(void)
+{
+	char *buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+	char *buffer2 = (char *) get_zeroed_page(GFP_ATOMIC);
+	unsigned long sector = bmap(target_inode, 0);
+	int offset = 0;
+
+	if (suspend_file_target_bdev) {
+		set_devinfo(suspend_file_target_bdev, target_inode->i_blkbits);
+
+		bdevname(suspend_file_target_bdev, buffer2);
+		offset += snprintf(buffer + offset, PAGE_SIZE - offset, 
+				"/dev/%s", buffer2);
+		
+		if (sector)
+			offset += snprintf(buffer + offset, PAGE_SIZE - offset,
+				":0x%lx", sector << devinfo.bmap_shift);
+	} else
+		offset += snprintf(buffer + offset, PAGE_SIZE - offset,
+				"%s is not a valid target.", suspend_file_target);
+			
+	sprintf(resume2_file, "file:%s", buffer);
+
+	free_page((unsigned long) buffer);
+	free_page((unsigned long) buffer2);
+
+	suspend_attempt_to_parse_resume_device(1);
+}
+
+static int __test_suspend_file_target(char *target, int resume_time, int quiet)
+{
+	suspend_file_get_target_info(target, 0, resume_time);
+	if (suspend_file_signature_op(GET_IMAGE_EXISTS) > -1) {
+		if (!quiet)
+			printk("Suspend2: FileAllocator: File signature found.\n");
+		if (!resume_time)
+			suspend_file_set_resume2();
+		
+		suspend_bio_ops.set_devinfo(&devinfo);
+		suspend_writer_posn.chains = &block_chain;
+		suspend_writer_posn.num_chains = 1;
+
+		if (!resume_time)
+			set_suspend_state(SUSPEND_CAN_SUSPEND);
+		return 0;
+	}
+
+	clear_suspend_state(SUSPEND_CAN_SUSPEND);
+
+	if (quiet)
+		return 1;
+
+	if (*target)
+		printk("Suspend2: FileAllocator: Sorry. No signature found at"
+					" %s.\n", target);
+	else
+		if (!resume_time)
+			printk("Suspend2: FileAllocator: Sorry. Target is not"
+						" set for suspending.\n");
+
+	return 1;
+}
+
+static void test_suspend_file_target(void)
+{
+	setting_suspend_file_target = 1;
+       	
+	printk("Suspend2: Suspending %sabled.\n",
+			__test_suspend_file_target(suspend_file_target, 0, 1) ?
+			"dis" : "en");
+	
+	setting_suspend_file_target = 0;
+}
+
+/*
+ * Parse Image Location
+ *
+ * Attempt to parse a resume2= parameter.
+ * Swap Writer accepts:
+ * resume2=file:DEVNAME[:FIRSTBLOCK]
+ *
+ * Where:
+ * DEVNAME is convertable to a dev_t by name_to_dev_t
+ * FIRSTBLOCK is the location of the first block in the file.
+ * BLOCKSIZE is the logical blocksize >= SECTOR_SIZE & <= PAGE_SIZE, 
+ * mod SECTOR_SIZE == 0 of the device.
+ * Data is validated by attempting to read a header from the
+ * location given. Failure will result in suspend_file refusing to
+ * save an image, and a reboot with correct parameters will be
+ * necessary.
+ */
+
+static int suspend_file_parse_sig_location(char *commandline,
+		int only_writer, int quiet)
+{
+	char *thischar, *devstart = NULL, *colon = NULL, *at_symbol = NULL;
+	int result = -EINVAL, target_blocksize = 0;
+
+	if (strncmp(commandline, "file:", 5)) {
+		if (!only_writer)
+			return 1;
+	} else
+		commandline += 5;
+
+	/* 
+	 * Don't check signature again if we're beginning a cycle. If we already
+	 * did the initialisation successfully, assume we'll be okay when it comes
+	 * to resuming.
+	 */
+	if (suspend_file_target_bdev)
+		return 0;
+	
+	devstart = thischar = commandline;
+	while ((*thischar != ':') && (*thischar != '@') &&
+		((thischar - commandline) < 250) && (*thischar))
+		thischar++;
+
+	if (*thischar == ':') {
+		colon = thischar;
+		*colon = 0;
+		thischar++;
+	}
+
+	while ((*thischar != '@') && ((thischar - commandline) < 250) && (*thischar))
+		thischar++;
+
+	if (*thischar == '@') {
+		at_symbol = thischar;
+		*at_symbol = 0;
+	}
+	
+	/* 
+	 * For the suspend_file, you can be able to resume, but not suspend,
+	 * because the resume2= is set correctly, but the suspend_file_target
+	 * isn't. 
+	 *
+	 * We may have come here as a result of setting resume2 or
+	 * suspend_file_target. We only test the suspend_file target in the
+	 * former case (it's already done in the later), and we do it before
+	 * setting the block number ourselves. It will overwrite the values
+	 * given on the command line if we don't.
+	 */
+
+	if (!setting_suspend_file_target)
+		__test_suspend_file_target(suspend_file_target, 1, 0);
+
+	if (colon)
+		target_firstblock = (int) simple_strtoul(colon + 1, NULL, 0);
+	else
+		target_firstblock = 0;
+
+	if (at_symbol) {
+		target_blocksize = (int) simple_strtoul(at_symbol + 1, NULL, 0);
+		if (target_blocksize & (SECTOR_SIZE - 1)) {
+			printk("FileAllocator: Blocksizes are multiples of %d.\n", SECTOR_SIZE);
+			result = -EINVAL;
+			goto out;
+		}
+	}
+	
+	if (!quiet)
+		printk("Suspend2 FileAllocator: Testing whether you can resume:\n");
+
+	suspend_file_get_target_info(commandline, 0, 1);
+
+	if (!suspend_file_target_bdev || IS_ERR(suspend_file_target_bdev)) {
+		suspend_file_target_bdev = NULL;
+		result = -1;
+		goto out;
+	}
+
+	if (target_blocksize)
+		set_devinfo(suspend_file_target_bdev, ffs(target_blocksize));
+
+	result = __test_suspend_file_target(commandline, 1, 0);
+
+out:
+	if (result)
+		clear_suspend_state(SUSPEND_CAN_SUSPEND);
+
+	if (!quiet)
+		printk("Resuming %sabled.\n",  result ? "dis" : "en");
+
+	if (colon)
+		*colon = ':';
+	if (at_symbol)
+		*at_symbol = '@';
+
+	return result;
+}
+
+/* suspend_file_save_config_info
+ *
+ * Description:	Save the target's name, not for resume time, but for all_settings.
+ * Arguments:	Buffer:		Pointer to a buffer of size PAGE_SIZE.
+ * Returns:	Number of bytes used for saving our data.
+ */
+
+static int suspend_file_save_config_info(char *buffer)
+{
+	strcpy(buffer, suspend_file_target);
+	return strlen(suspend_file_target) + 1;
+}
+
+/* suspend_file_load_config_info
+ *
+ * Description:	Reload target's name.
+ * Arguments:	Buffer:		Pointer to the start of the data.
+ *		Size:		Number of bytes that were saved.
+ */
+
+static void suspend_file_load_config_info(char *buffer, int size)
+{
+	strcpy(suspend_file_target, buffer);
+}
+
+static int suspend_file_initialise(int starting_cycle)
+{
+	if (starting_cycle) {
+		if (suspendActiveAllocator != &suspend_fileops)
+			return 0;
+
+		if (starting_cycle & SYSFS_SUSPEND && !*suspend_file_target) {
+			printk("FileAllocator is the active writer,  "
+					"but no filename has been set.\n");
+			return 1;
+		}
+	}
+
+	if (suspend_file_target)
+		suspend_file_get_target_info(suspend_file_target, starting_cycle, 0);
+
+	if (starting_cycle && (suspend_file_image_exists() == -1)) {
+		printk("%s is does not have a valid signature for suspending.\n",
+				suspend_file_target);
+		return 1;
+	}
+
+	return 0;
+}
+
+static struct suspend_sysfs_data sysfs_params[] = {
+
+	{
+	 SUSPEND2_ATTR("target", SYSFS_RW),
+	 SYSFS_STRING(suspend_file_target, 256, SYSFS_NEEDS_SM_FOR_WRITE),
+	 .write_side_effect		= test_suspend_file_target,
+	},
+
+	{
+	  SUSPEND2_ATTR("enabled", SYSFS_RW),
+	  SYSFS_INT(&suspend_fileops.enabled, 0, 1, 0),
+	  .write_side_effect		= attempt_to_parse_resume_device2,
+	}
+};
+
+static struct suspend_module_ops suspend_fileops = {
+	.type					= WRITER_MODULE,
+	.name					= "File Allocator",
+	.directory				= "file",
+	.module					= THIS_MODULE,
+	.print_debug_info			= suspend_file_print_debug_stats,
+	.save_config_info			= suspend_file_save_config_info,
+	.load_config_info			= suspend_file_load_config_info,
+	.storage_needed				= suspend_file_storage_needed,
+	.initialise				= suspend_file_initialise,
+	.cleanup				= suspend_file_cleanup,
+
+	.storage_available 	= suspend_file_storage_available,
+	.storage_allocated	= suspend_file_storage_allocated,
+	.release_storage	= suspend_file_release_storage,
+	.allocate_header_space	= suspend_file_allocate_header_space,
+	.allocate_storage	= suspend_file_allocate_storage,
+	.image_exists		= suspend_file_image_exists,
+	.mark_resume_attempted	= suspend_file_mark_resume_attempted,
+	.write_header_init	= suspend_file_write_header_init,
+	.write_header_cleanup	= suspend_file_write_header_cleanup,
+	.read_header_init	= suspend_file_read_header_init,
+	.read_header_cleanup	= suspend_file_read_header_cleanup,
+	.invalidate_image	= suspend_file_invalidate_image,
+	.parse_sig_location	= suspend_file_parse_sig_location,
+
+	.sysfs_data		= sysfs_params,
+	.num_sysfs_entries	= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+/* ---- Registration ---- */
+static __init int suspend_file_load(void)
+{
+	suspend_fileops.rw_init = suspend_bio_ops.rw_init;
+	suspend_fileops.rw_cleanup = suspend_bio_ops.rw_cleanup;
+	suspend_fileops.read_chunk = suspend_bio_ops.read_chunk;
+	suspend_fileops.write_chunk = suspend_bio_ops.write_chunk;
+	suspend_fileops.rw_header_chunk = suspend_bio_ops.rw_header_chunk;
+
+	return suspend_register_module(&suspend_fileops);
+}
+
+#ifdef MODULE
+static __exit void suspend_file_unload(void)
+{
+	suspend_unregister_module(&suspend_fileops);
+}
+
+module_init(suspend_file_load);
+module_exit(suspend_file_unload);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Suspend2 FileAllocator");
+#else
+late_initcall(suspend_file_load);
+#endif
diff --git a/kernel/power/suspend_swap.c b/kernel/power/suspend_swap.c
new file mode 100644
index 0000000..a81dcc1
--- /dev/null
+++ b/kernel/power/suspend_swap.c
@@ -0,0 +1,1262 @@
+/*
+ * kernel/power/suspend_swap.c
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * Distributed under GPLv2.
+ * 
+ * This file encapsulates functions for usage of swap space as a
+ * backing store.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/swapops.h>
+#include <linux/swap.h>
+#include <linux/syscalls.h>
+
+#include "suspend.h"
+#include "sysfs.h"
+#include "modules.h"
+#include "io.h"
+#include "ui.h"
+#include "extent.h"
+#include "block_io.h"
+
+static struct suspend_module_ops suspend_swapops;
+
+#define SIGNATURE_VER 6
+
+/* --- Struct of pages stored on disk */
+
+union diskpage {
+	union swap_header swh;	/* swh.magic is the only member used */
+};
+
+union p_diskpage {
+	union diskpage *pointer;
+	char *ptr;
+        unsigned long address;
+};
+
+/* Devices used for swap */
+static struct suspend_bdev_info devinfo[MAX_SWAPFILES];
+
+/* Extent chains for swap & blocks */
+struct extent_chain swapextents;
+struct extent_chain block_chain[MAX_SWAPFILES];
+
+static dev_t header_dev_t;
+static struct block_device *header_block_device;
+static unsigned long headerblock;
+
+/* For swapfile automatically swapon/off'd. */
+static char swapfilename[32] = "";
+static int suspend_swapon_status;
+
+/* Header Page Information */
+static int header_pages_allocated;
+
+/* Swap Pages */
+static int main_pages_allocated, main_pages_requested;
+
+/* User Specified Parameters. */
+
+static unsigned long resume_firstblock;
+static int resume_blocksize;
+static dev_t resume_swap_dev_t;
+static struct block_device *resume_block_device;
+
+struct sysinfo swapinfo;
+static int suspend_swap_invalidate_image(void);
+
+/* Block devices open. */
+struct bdev_opened
+{
+	dev_t device;
+	struct block_device *bdev;
+	int claimed;
+};
+
+/* 
+ * Entry MAX_SWAPFILES is the resume block device, which may
+ * not be a swap device enabled when we suspend.
+ * Entry MAX_SWAPFILES + 1 is the header block device, which
+ * is needed before we find out which slot it occupies.
+ */
+static struct bdev_opened *bdev_info_list[MAX_SWAPFILES + 2];
+       
+static void close_bdev(int i)
+{
+	struct bdev_opened *this = bdev_info_list[i];
+
+	if (this->claimed)
+		bd_release(this->bdev);
+
+	/* Release our reference. */
+	blkdev_put(this->bdev);
+
+	/* Free our info. */
+	kfree(this);
+
+	bdev_info_list[i] = NULL;
+}
+
+static void close_bdevs(void)
+{
+	int i;
+
+	for (i = 0; i < MAX_SWAPFILES; i++)
+		if (bdev_info_list[i])
+			close_bdev(i);
+
+	resume_block_device = header_block_device = NULL;
+}
+
+static struct block_device *open_bdev(int index, dev_t device, int display_errs)
+{
+	struct bdev_opened *this;
+	struct block_device *bdev;
+
+	if (bdev_info_list[index] && (bdev_info_list[index]->device == device)){
+		bdev = bdev_info_list[index]->bdev;
+		return bdev;
+	}
+	
+	if (bdev_info_list[index] && bdev_info_list[index]->device != device)
+		close_bdev(index);
+
+	bdev = open_by_devnum(device, FMODE_READ);
+
+	if (IS_ERR(bdev) || !bdev) {
+		if (display_errs)
+			suspend_early_boot_message(1,SUSPEND_CONTINUE_REQ,  
+				"Failed to get access to block device "
+				"\"%x\" (error %d).\n Maybe you need "
+				"to run mknod and/or lvmsetup in an "
+				"initrd/ramfs?", device, bdev);
+		return ERR_PTR(-EINVAL);
+	}
+
+	this = kmalloc(sizeof(struct bdev_opened), GFP_KERNEL);
+	if (!this) {
+		printk(KERN_WARNING "Suspend2: Failed to allocate memory for "
+				"opening a bdev.");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	bdev_info_list[index] = this;
+	this->device = device;
+	this->bdev = bdev;
+
+	if (index < MAX_SWAPFILES)
+		devinfo[index].bdev = bdev;
+
+	return bdev;
+}
+
+/* Must be silent - might be called from cat /sys/power/suspend2/debug_info
+ * Returns 0 if was off, -EBUSY if was on, error value otherwise.
+ */
+static int enable_swapfile(void)
+{
+	int activateswapresult = -EINVAL;
+
+	if (suspend_swapon_status)
+		return 0;
+
+	if (swapfilename[0]) {
+		/* Attempt to swap on with maximum priority */
+		activateswapresult = sys_swapon(swapfilename, 0xFFFF);
+		if ((activateswapresult) && (activateswapresult != -EBUSY))
+			printk("Suspend2: The swapfile/partition specified by "
+				"/sys/power/suspend2/suspend_swap/swapfile "
+				"(%s) could not be turned on (error %d). "
+				"Attempting to continue.\n",
+				swapfilename, activateswapresult);
+		if (!activateswapresult)
+			suspend_swapon_status = 1;
+	}
+	return activateswapresult;
+}
+
+/* Returns 0 if was on, -EINVAL if was off, error value otherwise */
+static int disable_swapfile(void)
+{
+	int result = -EINVAL;
+	
+	if (!suspend_swapon_status)
+		return 0;
+
+	if (swapfilename[0]) {
+		result = sys_swapoff(swapfilename);
+		if (result == -EINVAL)
+	 		return 0;	/* Wasn't on */
+		if (!result)
+			suspend_swapon_status = 0;
+	}
+
+	return result;
+}
+
+static int try_to_parse_resume_device(char *commandline, int quiet)
+{
+	struct kstat stat;
+	int error = 0;
+
+	resume_swap_dev_t = name_to_dev_t(commandline);
+
+	if (!resume_swap_dev_t) {
+		struct file *file = filp_open(commandline, O_RDONLY, 0);
+
+		if (!IS_ERR(file) && file) {
+			vfs_getattr(file->f_vfsmnt, file->f_dentry, &stat);
+			filp_close(file, NULL);
+		} else
+			error = vfs_stat(commandline, &stat);
+		if (!error)
+			resume_swap_dev_t = stat.rdev;
+	}
+
+	if (!resume_swap_dev_t) {
+		if (quiet)
+			return 1;
+
+		if (test_suspend_state(SUSPEND_TRYING_TO_RESUME))
+			suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ,
+			  "Failed to translate \"%s\" into a device id.\n",
+			  commandline);
+		else
+			printk("Suspend2: Can't translate \"%s\" into a device "
+					"id yet.\n", commandline);
+		return 1;
+	}
+
+	resume_block_device = open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 0);
+	if (IS_ERR(resume_block_device)) {
+		if (!quiet)
+			suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ,
+				"Failed to get access to \"%s\", where"
+				" the swap header should be found.",
+				commandline);
+		return 1;
+	}
+	
+	return 0;
+}
+
+/* 
+ * If we have read part of the image, we might have filled  memory with
+ * data that should be zeroed out.
+ */
+static void suspend_swap_noresume_reset(void)
+{
+	memset((char *) &devinfo, 0, sizeof(devinfo));
+}
+
+static int parse_signature(char *header, int restore)
+{
+	int type = -1;
+
+	if (!memcmp("SWAP-SPACE",header,10))
+		return 0;
+	else if (!memcmp("SWAPSPACE2",header,10))
+		return 1;
+
+	else if (!memcmp("S1SUSP",header,6))
+		type = 2;
+	else if (!memcmp("S2SUSP",header,6))
+		type = 3;
+	else if (!memcmp("S1SUSPEND",header,9))
+		type = 4;
+	
+	else if (!memcmp("z",header,1))
+		type = 12;
+	else if (!memcmp("Z",header,1))
+		type = 13;
+	
+	/* 
+	 * Put bdev of suspend header in last byte of swap header
+	 * (unsigned short)
+	 */
+	if (type > 11) {
+		dev_t *header_ptr = (dev_t *) &header[1];
+		unsigned char *headerblocksize_ptr =
+			(unsigned char *) &header[5];
+		u32 *headerblock_ptr = (u32 *) &header[6];
+		header_dev_t = *header_ptr;
+		/* 
+		 * We are now using the highest bit of the char to indicate
+		 * whether we have attempted to resume from this image before.
+		 */
+		clear_suspend_state(SUSPEND_RESUMED_BEFORE);
+		if (((int) *headerblocksize_ptr) & 0x80)
+			set_suspend_state(SUSPEND_RESUMED_BEFORE);
+		headerblock = (unsigned long) *headerblock_ptr;
+	}
+
+	if ((restore) && (type > 5)) {
+		/* We only reset our own signatures */
+		if (type & 1)
+			memcpy(header,"SWAPSPACE2",10);
+		else
+			memcpy(header,"SWAP-SPACE",10);
+	}
+
+	return type;
+}
+
+/*
+ * prepare_signature
+ */
+static int prepare_signature(dev_t bdev, unsigned long block,
+		char *current_header)
+{
+	int current_type = parse_signature(current_header, 0);
+	dev_t *header_ptr = (dev_t *) (&current_header[1]);
+	unsigned long *headerblock_ptr =
+		(unsigned long *) (&current_header[6]);
+
+	if ((current_type > 1) && (current_type < 6))
+		return 1;
+
+	/* At the moment, I don't have a way to handle the block being
+	 * > 32 bits. Not enough room in the signature and no way to
+	 * safely put the data elsewhere. */
+
+	if (BITS_PER_LONG == 64 && ffs(block) > 31) {
+		suspend_prepare_status(DONT_CLEAR_BAR,
+			"Header sector requires 33+ bits. "
+			"Would not be able to resume.");
+		return 1;
+	}
+
+	if (current_type & 1)
+		current_header[0] = 'Z';
+	else
+		current_header[0] = 'z';
+	*header_ptr = bdev;
+	/* prev is the first/last swap page of the resume area */
+	*headerblock_ptr = (unsigned long) block; 
+	return 0;
+}
+
+static int __suspend_swap_allocate_storage(int main_storage_requested,
+		int header_storage);
+
+static int suspend_swap_allocate_header_space(int space_requested)
+{
+	int i;
+
+	if (!swapextents.size && __suspend_swap_allocate_storage(
+				main_pages_requested, space_requested)) {
+		printk("Failed to allocate space for the header.\n");
+		return -ENOSPC;
+	}
+
+	suspend_extent_state_goto_start(&suspend_writer_posn);
+	suspend_bio_ops.forward_one_page(); /* To first page */
+	
+	for (i = 0; i < space_requested; i++) {
+		if (suspend_bio_ops.forward_one_page()) {
+			printk("Out of space while seeking to allocate "
+					"header pages,\n");
+			header_pages_allocated = i;
+			return -ENOSPC;
+		}
+
+	}
+
+	header_pages_allocated = space_requested;
+
+	/* The end of header pages will be the start of pageset 2;
+	 * we are now sitting on the first pageset2 page. */
+	suspend_extent_state_save(&suspend_writer_posn,
+			&suspend_writer_posn_save[2]);
+	return 0;
+}
+
+static void get_main_pool_phys_params(void)
+{
+	struct extent *extentpointer = NULL;
+	unsigned long address;
+	int i, extent_min = -1, extent_max = -1, last_chain = -1;
+
+	for (i = 0; i < MAX_SWAPFILES; i++)
+		if (block_chain[i].first)
+			suspend_put_extent_chain(&block_chain[i]);
+
+	suspend_extent_for_each(&swapextents, extentpointer, address) {
+		swp_entry_t swap_address = extent_val_to_swap_entry(address);
+		pgoff_t offset = swp_offset(swap_address);
+		unsigned swapfilenum = swp_type(swap_address);
+		struct swap_info_struct *sis = get_swap_info_struct(swapfilenum);
+		sector_t new_sector = map_swap_page(sis, offset);
+
+		if ((new_sector == extent_max + 1) &&
+		    (last_chain == swapfilenum))
+			extent_max++;
+		else {
+			if (extent_min > -1) {
+				if (test_action_state(SUSPEND_TEST_BIO))
+					printk("Adding extent chain %d %d-%d.\n",
+						swapfilenum,
+						extent_min <<
+						 devinfo[last_chain].bmap_shift,
+						extent_max <<
+						 devinfo[last_chain].bmap_shift);
+						
+				suspend_add_to_extent_chain(
+					&block_chain[last_chain],
+					extent_min, extent_max);
+			}
+			extent_min = extent_max = new_sector;
+			last_chain = swapfilenum;
+		}
+	}
+
+	if (extent_min > -1) {
+		if (test_action_state(SUSPEND_TEST_BIO))
+			printk("Adding extent chain %d %d-%d.\n",
+				last_chain,
+				extent_min <<
+					devinfo[last_chain].bmap_shift,
+				extent_max <<
+					devinfo[last_chain].bmap_shift);
+		suspend_add_to_extent_chain(
+			&block_chain[last_chain],
+			extent_min, extent_max);
+	}
+
+	suspend_swap_allocate_header_space(header_pages_allocated);
+}
+
+static int suspend_swap_storage_allocated(void)
+{
+	return main_pages_requested + header_pages_allocated;
+}
+
+static int suspend_swap_storage_available(void)
+{
+	si_swapinfo(&swapinfo);
+	return (((int) swapinfo.freeswap + main_pages_allocated) * PAGE_SIZE /
+		(PAGE_SIZE + sizeof(unsigned long) + sizeof(int)));
+}
+
+static int suspend_swap_initialise(int starting_cycle)
+{
+	if (!starting_cycle)
+		return 0;
+
+	enable_swapfile();
+
+	if (resume_swap_dev_t && !resume_block_device &&
+	    IS_ERR(resume_block_device =
+	    		open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 1)))
+		return 1;
+
+	return 0;
+}
+
+static void suspend_swap_cleanup(int ending_cycle)
+{
+	if (ending_cycle)
+		disable_swapfile();
+	
+	close_bdevs();
+}
+
+static int suspend_swap_release_storage(void)
+{
+	int i = 0;
+
+	if (test_action_state(SUSPEND_KEEP_IMAGE) &&
+	    test_suspend_state(SUSPEND_NOW_RESUMING))
+		return 0;
+
+	header_pages_allocated = 0;
+	main_pages_allocated = 0;
+
+	if (swapextents.first) {
+		/* Free swap entries */
+		struct extent *extentpointer;
+		unsigned long extentvalue;
+		suspend_extent_for_each(&swapextents, extentpointer, 
+				extentvalue)
+			swap_free(extent_val_to_swap_entry(extentvalue));
+
+		suspend_put_extent_chain(&swapextents);
+
+		for (i = 0; i < MAX_SWAPFILES; i++)
+			if (block_chain[i].first)
+				suspend_put_extent_chain(&block_chain[i]);
+	}
+
+	return 0;
+}
+
+static int suspend_swap_allocate_storage(int space_requested)
+{
+	if (!__suspend_swap_allocate_storage(space_requested,
+				header_pages_allocated)) {
+		main_pages_requested = space_requested;
+		return 0;
+	}
+
+	return -ENOSPC;
+}
+
+static void free_swap_range(unsigned long min, unsigned long max)
+{
+	int j;
+
+	for (j = min; j < max; j++)
+		swap_free(extent_val_to_swap_entry(j));
+}
+
+/* 
+ * Round robin allocation (where swap storage has the same priority).
+ * could make this very inefficient, so we track extents allocated on
+ * a per-swapfiles basis.
+ */
+static int __suspend_swap_allocate_storage(int main_space_requested,
+		int header_space_requested)
+{
+	int i, result = 0, first[MAX_SWAPFILES], pages_to_get, extra_pages, gotten = 0;
+	unsigned long extent_min[MAX_SWAPFILES], extent_max[MAX_SWAPFILES];
+
+	extra_pages = DIV_ROUND_UP(main_space_requested * (sizeof(unsigned long)
+			       + sizeof(int)), PAGE_SIZE);
+	pages_to_get = main_space_requested + extra_pages +
+		header_space_requested - swapextents.size;
+
+	if (pages_to_get < 1)
+		return 0;
+
+	for (i=0; i < MAX_SWAPFILES; i++) {
+		struct swap_info_struct *si = get_swap_info_struct(i);
+		if ((devinfo[i].bdev = si->bdev))
+			devinfo[i].dev_t = si->bdev->bd_dev;
+		devinfo[i].bmap_shift = 3;
+		devinfo[i].blocks_per_page = 1;
+		first[i] = 1;
+	}
+
+	for(i=0; i < pages_to_get; i++) {
+		swp_entry_t entry;
+		unsigned long new_value;
+		unsigned swapfilenum;
+
+		entry = get_swap_page();
+		if (!entry.val)
+			break;
+
+		swapfilenum = swp_type(entry);
+		new_value = swap_entry_to_extent_val(entry);
+
+		if (first[swapfilenum]) {
+			first[swapfilenum] = 0;
+			extent_min[swapfilenum] = new_value;
+			extent_max[swapfilenum] = new_value;
+			gotten++;
+			continue;
+		}
+
+		if (new_value == extent_max[swapfilenum] + 1) {
+			extent_max[swapfilenum]++;
+			gotten++;
+			continue;
+		}
+
+		if (suspend_add_to_extent_chain(&swapextents,
+					extent_min[swapfilenum],
+					extent_max[swapfilenum])) {
+			free_swap_range(extent_min[swapfilenum],
+					extent_max[swapfilenum]);
+			swap_free(entry);
+			gotten -= (extent_max[swapfilenum] -
+					extent_min[swapfilenum]);
+			break;
+		} else {
+			extent_min[swapfilenum] = new_value;
+			extent_max[swapfilenum] = new_value;
+			gotten++;
+		}
+	}
+
+	for (i = 0; i < MAX_SWAPFILES; i++)
+		if (!first[i] && suspend_add_to_extent_chain(&swapextents,
+					extent_min[i], extent_max[i])) {
+			free_swap_range(extent_min[i], extent_max[i]);
+			gotten -= (extent_max[i] - extent_min[i]);
+		}
+
+	if (gotten < pages_to_get)
+		result = -ENOSPC;
+
+	main_pages_allocated += gotten;
+	get_main_pool_phys_params();
+	return result;
+}
+
+static int suspend_swap_write_header_init(void)
+{
+	int i, result;
+	struct swap_info_struct *si;
+
+	suspend_extent_state_goto_start(&suspend_writer_posn);
+
+	suspend_writer_buffer_posn = suspend_header_bytes_used = 0;
+
+	/* Info needed to bootstrap goes at the start of the header.
+	 * First we save the positions and devinfo, including the number
+	 * of header pages. Then we save the structs containing data needed
+	 * for reading the header pages back.
+	 * Note that even if header pages take more than one page, when we
+	 * read back the info, we will have restored the location of the
+	 * next header page by the time we go to use it.
+	 */
+
+	/* Forward one page will be done prior to the read */
+	for (i = 0; i < MAX_SWAPFILES; i++) {
+		si = get_swap_info_struct(i);
+		if (si->swap_file)
+			devinfo[i].dev_t = si->bdev->bd_dev;
+		else
+			devinfo[i].dev_t = (dev_t) 0;
+	}
+
+	if ((result = suspend_bio_ops.rw_header_chunk(WRITE,
+			&suspend_swapops,
+			(char *) &suspend_writer_posn_save, 
+			sizeof(suspend_writer_posn_save))))
+		return result;
+
+	if ((result = suspend_bio_ops.rw_header_chunk(WRITE,
+			&suspend_swapops,
+			(char *) &devinfo, sizeof(devinfo))))
+		return result;
+
+	for (i=0; i < MAX_SWAPFILES; i++)
+		suspend_serialise_extent_chain(&suspend_swapops, &block_chain[i]);
+
+	return 0;
+}
+
+static int suspend_swap_write_header_cleanup(void)
+{
+	int result;
+	struct swap_info_struct *si;
+
+	/* Write any unsaved data */
+	if (suspend_writer_buffer_posn)
+		suspend_bio_ops.write_header_chunk_finish();
+
+	suspend_bio_ops.finish_all_io();
+
+	suspend_extent_state_goto_start(&suspend_writer_posn);
+	suspend_bio_ops.forward_one_page();
+
+	/* Adjust swap header */
+	suspend_bio_ops.bdev_page_io(READ, resume_block_device,
+			resume_firstblock,
+			virt_to_page(suspend_writer_buffer));
+
+	si = get_swap_info_struct(suspend_writer_posn.current_chain);
+	result = prepare_signature(si->bdev->bd_dev,
+			suspend_writer_posn.current_offset,
+		((union swap_header *) suspend_writer_buffer)->magic.magic);
+		
+	if (!result)
+		suspend_bio_ops.bdev_page_io(WRITE, resume_block_device,
+			resume_firstblock,
+			virt_to_page(suspend_writer_buffer));
+
+	suspend_bio_ops.finish_all_io();
+
+	return result;
+}
+
+/* ------------------------- HEADER READING ------------------------- */
+
+/*
+ * read_header_init()
+ * 
+ * Description:
+ * 1. Attempt to read the device specified with resume2=.
+ * 2. Check the contents of the swap header for our signature.
+ * 3. Warn, ignore, reset and/or continue as appropriate.
+ * 4. If continuing, read the suspend_swap configuration section
+ *    of the header and set up block device info so we can read
+ *    the rest of the header & image.
+ *
+ * Returns:
+ * May not return if user choose to reboot at a warning.
+ * -EINVAL if cannot resume at this time. Booting should continue
+ * normally.
+ */
+
+static int suspend_swap_read_header_init(void)
+{
+	int i, result = 0;
+
+	suspend_header_bytes_used = 0;
+
+	if (!header_dev_t) {
+		printk("read_header_init called when we haven't "
+				"verified there is an image!\n");
+		return -EINVAL;
+	}
+
+	/* 
+	 * If the header is not on the resume_swap_dev_t, get the resume device first.
+	 */
+	if (header_dev_t != resume_swap_dev_t) {
+		header_block_device = open_bdev(MAX_SWAPFILES + 1,
+				header_dev_t, 1);
+
+		if (IS_ERR(header_block_device))
+			return PTR_ERR(header_block_device);
+	} else
+		header_block_device = resume_block_device;
+
+	/* 
+	 * Read suspend_swap configuration.
+	 * Headerblock size taken into account already.
+	 */
+	suspend_bio_ops.bdev_page_io(READ, header_block_device,
+			headerblock << 3,
+			virt_to_page((unsigned long) suspend_writer_buffer));
+
+	memcpy(&suspend_writer_posn_save, suspend_writer_buffer, 3 * sizeof(struct extent_iterate_saved_state));
+
+	suspend_writer_buffer_posn = 3 * sizeof(struct extent_iterate_saved_state);
+	suspend_header_bytes_used += 3 * sizeof(struct extent_iterate_saved_state);
+
+	memcpy(&devinfo, suspend_writer_buffer + suspend_writer_buffer_posn, sizeof(devinfo));
+
+	suspend_writer_buffer_posn += sizeof(devinfo);
+	suspend_header_bytes_used += sizeof(devinfo);
+
+	/* Restore device info */
+	for (i = 0; i < MAX_SWAPFILES; i++) {
+		dev_t thisdevice = devinfo[i].dev_t;
+		struct block_device *result;
+
+		devinfo[i].bdev = NULL;
+
+		if (!thisdevice)
+			continue;
+
+		if (thisdevice == resume_swap_dev_t) {
+			devinfo[i].bdev = resume_block_device;
+			bdev_info_list[i] = bdev_info_list[MAX_SWAPFILES];
+			bdev_info_list[MAX_SWAPFILES] = NULL;
+			continue;
+		}
+
+		if (thisdevice == header_dev_t) {
+			devinfo[i].bdev = header_block_device;
+			bdev_info_list[i] = bdev_info_list[MAX_SWAPFILES + 1];
+			bdev_info_list[MAX_SWAPFILES + 1] = NULL;
+			continue;
+		}
+
+		result = open_bdev(i, thisdevice, 1);
+		if (IS_ERR(result))
+			return PTR_ERR(result);
+	}
+
+	suspend_bio_ops.read_header_init();
+	suspend_extent_state_goto_start(&suspend_writer_posn);
+	suspend_bio_ops.set_extra_page_forward();
+
+	for (i = 0; i < MAX_SWAPFILES && !result; i++)
+		result = suspend_load_extent_chain(&block_chain[i]);
+
+	return result;
+}
+
+static int suspend_swap_read_header_cleanup(void)
+{
+	suspend_bio_ops.rw_cleanup(READ);
+	return 0;
+}
+
+/* suspend_swap_invalidate_image
+ * 
+ */
+static int suspend_swap_invalidate_image(void)
+{
+	union p_diskpage cur;
+	int result = 0;
+	char newsig[11];
+	
+	cur.address = get_zeroed_page(GFP_ATOMIC);
+	if (!cur.address) {
+		printk("Unable to allocate a page for restoring the swap signature.\n");
+		return -ENOMEM;
+	}
+
+	/*
+	 * If nr_suspends == 0, we must be booting, so no swap pages
+	 * will be recorded as used yet.
+	 */
+
+	if (nr_suspends > 0)
+		suspend_swap_release_storage();
+
+	/* 
+	 * We don't do a sanity check here: we want to restore the swap 
+	 * whatever version of kernel made the suspend image.
+	 * 
+	 * We need to write swap, but swap may not be enabled so
+	 * we write the device directly
+	 */
+	
+	suspend_bio_ops.bdev_page_io(READ, resume_block_device,
+			resume_firstblock,
+			virt_to_page(cur.pointer));
+
+	result = parse_signature(cur.pointer->swh.magic.magic, 1);
+		
+	if (result < 5)
+		goto out;
+
+	strncpy(newsig, cur.pointer->swh.magic.magic, 10);
+	newsig[10] = 0;
+
+	suspend_bio_ops.bdev_page_io(WRITE, resume_block_device,
+			resume_firstblock,
+			virt_to_page(cur.pointer));
+
+	if (!nr_suspends)
+		printk(KERN_WARNING "Suspend2: Image invalidated.\n");
+out:
+	suspend_bio_ops.finish_all_io();
+	free_page(cur.address);
+	return 0;
+}
+
+/*
+ * workspace_size
+ *
+ * Description:
+ * Returns the number of bytes of RAM needed for this
+ * code to do its work. (Used when calculating whether
+ * we have enough memory to be able to suspend & resume).
+ *
+ */
+static int suspend_swap_memory_needed(void)
+{
+	return 1;
+}
+
+/*
+ * Print debug info
+ *
+ * Description:
+ */
+static int suspend_swap_print_debug_stats(char *buffer, int size)
+{
+	int len = 0;
+	struct sysinfo sysinfo;
+	
+	if (suspendActiveAllocator != &suspend_swapops) {
+		len = snprintf_used(buffer, size, "- SwapAllocator inactive.\n");
+		return len;
+	}
+
+	len = snprintf_used(buffer, size, "- SwapAllocator active.\n");
+	if (swapfilename[0])
+		len+= snprintf_used(buffer+len, size-len,
+			"  Attempting to automatically swapon: %s.\n", swapfilename);
+
+	si_swapinfo(&sysinfo);
+	
+	len+= snprintf_used(buffer+len, size-len, "  Swap available for image: %ld pages.\n",
+			(int) sysinfo.freeswap + suspend_swap_storage_allocated());
+
+	return len;
+}
+
+/*
+ * Storage needed
+ *
+ * Returns amount of space in the swap header required
+ * for the suspend_swap's data. This ignores the links between
+ * pages, which we factor in when allocating the space.
+ *
+ * We ensure the space is allocated, but actually save the
+ * data from write_header_init and therefore don't also define a
+ * save_config_info routine.
+ */
+static int suspend_swap_storage_needed(void)
+{
+	int i, result;
+	result = sizeof(suspend_writer_posn_save) + sizeof(devinfo);
+
+	for (i = 0; i < MAX_SWAPFILES; i++) {
+		result += 3 * sizeof(int);
+		result += (2 * sizeof(unsigned long) * 
+			block_chain[i].num_extents);
+	}
+
+	return result;
+}
+
+/*
+ * Image_exists
+ */
+static int suspend_swap_image_exists(void)
+{
+	int signature_found;
+	union p_diskpage diskpage;
+	
+	if (!resume_swap_dev_t) {
+		printk("Not even trying to read header "
+				"because resume_swap_dev_t is not set.\n");
+		return 0;
+	}
+	
+	if (!resume_block_device &&
+	    IS_ERR(resume_block_device =
+			open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 1))) {
+		printk("Failed to open resume dev_t (%x).\n", resume_swap_dev_t);
+		return 0;
+	}
+
+	diskpage.address = get_zeroed_page(GFP_ATOMIC);
+
+	suspend_bio_ops.bdev_page_io(READ, resume_block_device,
+			resume_firstblock,
+			virt_to_page(diskpage.ptr));
+	suspend_bio_ops.finish_all_io();
+
+	signature_found = parse_signature(diskpage.pointer->swh.magic.magic, 0);
+	free_page(diskpage.address);
+
+	if (signature_found < 2) {
+		printk("Suspend2: Normal swapspace found.\n");
+		return 0;	/* Normal swap space */
+	} else if (signature_found == -1) {
+		printk(KERN_ERR "Suspend2: Unable to find a signature. Could "
+				"you have moved a swap file?\n");
+		return 0;
+	} else if (signature_found < 6) {
+		printk("Suspend2: Detected another implementation's signature.\n");
+		return 0;
+	} else if ((signature_found >> 1) != SIGNATURE_VER) {
+		if ((!(test_suspend_state(SUSPEND_NORESUME_SPECIFIED))) &&
+			suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ,
+			 "Found a different style suspend image signature.")) {
+			set_suspend_state(SUSPEND_NORESUME_SPECIFIED);
+			printk("Suspend2: Dectected another implementation's signature.\n");
+		}
+	}
+
+	return 1;
+}
+
+/*
+ * Mark resume attempted.
+ *
+ * Record that we tried to resume from this image.
+ */
+static void suspend_swap_mark_resume_attempted(int mark)
+{
+	union p_diskpage diskpage;
+	int signature_found;
+	
+	if (!resume_swap_dev_t) {
+		printk("Not even trying to record attempt at resuming"
+				" because resume_swap_dev_t is not set.\n");
+		return;
+	}
+	
+	diskpage.address = get_zeroed_page(GFP_ATOMIC);
+
+	suspend_bio_ops.bdev_page_io(READ, resume_block_device,
+			resume_firstblock,
+			virt_to_page(diskpage.ptr));
+	signature_found = parse_signature(diskpage.pointer->swh.magic.magic, 0);
+
+	switch (signature_found) {
+		case 12:
+		case 13:
+			diskpage.pointer->swh.magic.magic[5] &= ~0x80;
+			if (mark)
+				diskpage.pointer->swh.magic.magic[5] |= 0x80;
+			break;
+	}
+	
+	suspend_bio_ops.bdev_page_io(WRITE, resume_block_device,
+			resume_firstblock,
+			virt_to_page(diskpage.ptr));
+	suspend_bio_ops.finish_all_io();
+	free_page(diskpage.address);
+	return;
+}
+
+/*
+ * Parse Image Location
+ *
+ * Attempt to parse a resume2= parameter.
+ * Swap Writer accepts:
+ * resume2=swap:DEVNAME[:FIRSTBLOCK][@BLOCKSIZE]
+ *
+ * Where:
+ * DEVNAME is convertable to a dev_t by name_to_dev_t
+ * FIRSTBLOCK is the location of the first block in the swap file
+ * (specifying for a swap partition is nonsensical but not prohibited).
+ * Data is validated by attempting to read a swap header from the
+ * location given. Failure will result in suspend_swap refusing to
+ * save an image, and a reboot with correct parameters will be
+ * necessary.
+ */
+static int suspend_swap_parse_sig_location(char *commandline,
+		int only_allocator, int quiet)
+{
+	char *thischar, *devstart, *colon = NULL, *at_symbol = NULL;
+	union p_diskpage diskpage;
+	int signature_found, result = -EINVAL, temp_result;
+
+	if (strncmp(commandline, "swap:", 5)) {
+		/* 
+		 * Failing swap:, we'll take a simple
+		 * resume2=/dev/hda2, but fall through to
+		 * other allocators if /dev/ isn't matched.
+		 */
+		if (strncmp(commandline, "/dev/", 5))
+			return 1;
+	} else
+		commandline += 5;
+
+	devstart = thischar = commandline;
+	while ((*thischar != ':') && (*thischar != '@') &&
+		((thischar - commandline) < 250) && (*thischar))
+		thischar++;
+
+	if (*thischar == ':') {
+		colon = thischar;
+		*colon = 0;
+		thischar++;
+	}
+
+	while ((*thischar != '@') && ((thischar - commandline) < 250) && (*thischar))
+		thischar++;
+
+	if (*thischar == '@') {
+		at_symbol = thischar;
+		*at_symbol = 0;
+	}
+	
+	if (colon)
+		resume_firstblock = (int) simple_strtoul(colon + 1, NULL, 0);
+	else
+		resume_firstblock = 0;
+
+	clear_suspend_state(SUSPEND_CAN_SUSPEND);
+	clear_suspend_state(SUSPEND_CAN_RESUME);
+	
+	/* Legacy */
+	if (at_symbol) {
+		resume_blocksize = (int) simple_strtoul(at_symbol + 1, NULL, 0);
+		if (resume_blocksize & (SECTOR_SIZE - 1)) {
+			if (!quiet)
+				printk("SwapAllocator: Blocksizes are multiples"
+						"of %d!\n", SECTOR_SIZE);
+			return -EINVAL;
+		}
+		resume_firstblock = resume_firstblock *
+			(resume_blocksize / SECTOR_SIZE);
+	}
+	
+	temp_result = try_to_parse_resume_device(devstart, quiet);
+
+	if (colon)
+		*colon = ':';
+	if (at_symbol)
+		*at_symbol = '@';
+
+	if (temp_result)
+		return -EINVAL;
+
+	diskpage.address = get_zeroed_page(GFP_ATOMIC);
+	if (!diskpage.address) {
+		printk(KERN_ERR "Suspend2: SwapAllocator: Failed to allocate "
+					"a diskpage for I/O.\n");
+		return -ENOMEM;
+	}
+
+	temp_result = suspend_bio_ops.bdev_page_io(READ,
+			resume_block_device,
+			resume_firstblock,
+			virt_to_page(diskpage.ptr));
+
+	suspend_bio_ops.finish_all_io();
+	
+	if (temp_result) {
+		printk(KERN_ERR "Suspend2: SwapAllocator: Failed to submit "
+					"I/O.\n");
+		goto invalid;
+	}
+	
+	signature_found = parse_signature(diskpage.pointer->swh.magic.magic, 0);
+
+	if (signature_found != -1) {
+		if (!quiet)
+			printk("Suspend2: SwapAllocator: Signature found.\n");
+		result = 0;
+
+		suspend_bio_ops.set_devinfo(devinfo);
+		suspend_writer_posn.chains = &block_chain[0];
+		suspend_writer_posn.num_chains = MAX_SWAPFILES;
+		set_suspend_state(SUSPEND_CAN_SUSPEND);
+		set_suspend_state(SUSPEND_CAN_RESUME);
+	} else
+		if (!quiet)
+			printk(KERN_ERR "Suspend2: SwapAllocator: No swap "
+				"signature found at specified location.\n");
+invalid:
+	free_page((unsigned long) diskpage.address);
+	return result;
+
+}
+
+static int header_locations_read_sysfs(const char *page, int count)
+{
+	int i, printedpartitionsmessage = 0, len = 0, haveswap = 0;
+	struct inode *swapf = 0;
+	int zone;
+	char *path_page = (char *) __get_free_page(GFP_KERNEL);
+	char *path, *output = (char *) page;
+	int path_len;
+	
+	if (!page)
+		return 0;
+
+	for (i = 0; i < MAX_SWAPFILES; i++) {
+		struct swap_info_struct *si =  get_swap_info_struct(i);
+
+		if (!si->swap_file)
+			continue;
+		
+		if (S_ISBLK(si->swap_file->f_mapping->host->i_mode)) {
+			haveswap = 1;
+			if (!printedpartitionsmessage) {
+				len += sprintf(output + len, 
+					"For swap partitions, simply use the "
+					"format: resume2=swap:/dev/hda1.\n");
+				printedpartitionsmessage = 1;
+			}
+		} else {
+			path_len = 0;
+			
+			path = d_path(si->swap_file->f_dentry,
+				si->swap_file->f_vfsmnt,
+				path_page,
+				PAGE_SIZE);
+			path_len = snprintf(path_page, 31, "%s", path);
+			
+			haveswap = 1;
+			swapf = si->swap_file->f_mapping->host;
+			if (!(zone = bmap(swapf,0))) {
+				len+= sprintf(output + len, 
+					"Swapfile %s has been corrupted. Reuse"
+					" mkswap on it and try again.\n",
+					path_page);
+			} else {
+				char name_buffer[255];
+				len+= sprintf(output + len, "For swapfile `%s`,"
+					" use resume2=swap:/dev/%s:0x%x.\n",
+					path_page,
+					bdevname(si->bdev, name_buffer),
+					zone << (swapf->i_blkbits - 9));
+			}
+
+		}
+	}
+	
+	if (!haveswap)
+		len = sprintf(output, "You need to turn on swap partitions "
+				"before examining this file.\n");
+
+	free_page((unsigned long) path_page);
+	return len;
+}
+
+static struct suspend_sysfs_data sysfs_params[] = {
+	{
+	 SUSPEND2_ATTR("swapfilename", SYSFS_RW),
+	 SYSFS_STRING(swapfilename, 255, 0)
+	},
+
+	{
+	 SUSPEND2_ATTR("headerlocations", SYSFS_READONLY),
+	 SYSFS_CUSTOM(header_locations_read_sysfs, NULL, 0)
+	},
+
+	{ SUSPEND2_ATTR("enabled", SYSFS_RW),
+	  SYSFS_INT(&suspend_swapops.enabled, 0, 1, 0),
+	  .write_side_effect		= attempt_to_parse_resume_device2,
+	}
+};
+
+static struct suspend_module_ops suspend_swapops = {
+	.type					= WRITER_MODULE,
+	.name					= "Swap Allocator",
+	.directory				= "swap",
+	.module					= THIS_MODULE,
+	.memory_needed				= suspend_swap_memory_needed,
+	.print_debug_info			= suspend_swap_print_debug_stats,
+	.storage_needed				= suspend_swap_storage_needed,
+	.initialise				= suspend_swap_initialise,
+	.cleanup				= suspend_swap_cleanup,
+
+	.noresume_reset	= suspend_swap_noresume_reset,
+	.storage_available 	= suspend_swap_storage_available,
+	.storage_allocated	= suspend_swap_storage_allocated,
+	.release_storage	= suspend_swap_release_storage,
+	.allocate_header_space	= suspend_swap_allocate_header_space,
+	.allocate_storage	= suspend_swap_allocate_storage,
+	.image_exists		= suspend_swap_image_exists,
+	.mark_resume_attempted	= suspend_swap_mark_resume_attempted,
+	.write_header_init	= suspend_swap_write_header_init,
+	.write_header_cleanup	= suspend_swap_write_header_cleanup,
+	.read_header_init	= suspend_swap_read_header_init,
+	.read_header_cleanup	= suspend_swap_read_header_cleanup,
+	.invalidate_image	= suspend_swap_invalidate_image,
+	.parse_sig_location	= suspend_swap_parse_sig_location,
+
+	.sysfs_data		= sysfs_params,
+	.num_sysfs_entries	= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+/* ---- Registration ---- */
+static __init int suspend_swap_load(void)
+{
+	suspend_swapops.rw_init = suspend_bio_ops.rw_init;
+	suspend_swapops.rw_cleanup = suspend_bio_ops.rw_cleanup;
+	suspend_swapops.read_chunk = suspend_bio_ops.read_chunk;
+	suspend_swapops.write_chunk = suspend_bio_ops.write_chunk;
+	suspend_swapops.rw_header_chunk = suspend_bio_ops.rw_header_chunk;
+
+	return suspend_register_module(&suspend_swapops);
+}
+
+#ifdef MODULE
+static __exit void suspend_swap_unload(void)
+{
+	suspend_unregister_module(&suspend_swapops);
+}
+
+module_init(suspend_swap_load);
+module_exit(suspend_swap_unload);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Suspend2 SwapAllocator");
+#else
+late_initcall(suspend_swap_load);
+#endif
diff --git a/kernel/power/suspend_userui.c b/kernel/power/suspend_userui.c
new file mode 100644
index 0000000..a11cd3d
--- /dev/null
+++ b/kernel/power/suspend_userui.c
@@ -0,0 +1,649 @@
+/*
+ * kernel/power/user_ui.c
+ *
+ * Copyright (C) 2005-2007 Bernard Blackham
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for Suspend2's user interface.
+ *
+ * The user interface code talks to a userspace program via a
+ * netlink socket.
+ *
+ * The kernel side:
+ * - starts the userui program;
+ * - sends text messages and progress bar status;
+ *
+ * The user space side:
+ * - passes messages regarding user requests (abort, toggle reboot etc)
+ *
+ */
+
+#define __KERNEL_SYSCALLS__
+
+#include <linux/suspend.h>
+#include <linux/freezer.h>
+#include <linux/console.h>
+#include <linux/ctype.h>
+#include <linux/tty.h>
+#include <linux/vt_kern.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/kmod.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+ 
+#include "sysfs.h"
+#include "modules.h"
+#include "suspend.h"
+#include "ui.h"
+#include "netlink.h"
+#include "power_off.h"
+
+static char local_printf_buf[1024];	/* Same as printk - should be safe */
+
+static struct user_helper_data ui_helper_data;
+static struct suspend_module_ops userui_ops;
+static int orig_kmsg;
+
+static char lastheader[512];
+static int lastheader_message_len;
+static int ui_helper_changed; /* Used at resume-time so don't overwrite value
+				set from initrd/ramfs. */
+
+/* Number of distinct progress amounts that userspace can display */
+static int progress_granularity = 30;
+
+DECLARE_WAIT_QUEUE_HEAD(userui_wait_for_key);
+
+static void ui_nl_set_state(int n)
+{
+	/* Only let them change certain settings */
+	static const int suspend_action_mask =
+		(1 << SUSPEND_REBOOT) | (1 << SUSPEND_PAUSE) | (1 << SUSPEND_SLOW) |
+		(1 << SUSPEND_LOGALL) | (1 << SUSPEND_SINGLESTEP) |
+		(1 << SUSPEND_PAUSE_NEAR_PAGESET_END);
+
+	suspend_action = (suspend_action & (~suspend_action_mask)) |
+		(n & suspend_action_mask);
+
+	if (!test_action_state(SUSPEND_PAUSE) &&
+			!test_action_state(SUSPEND_SINGLESTEP))
+		wake_up_interruptible(&userui_wait_for_key);
+}
+
+static void userui_redraw(void)
+{
+	suspend_send_netlink_message(&ui_helper_data,
+			USERUI_MSG_REDRAW, NULL, 0);
+}
+
+static int userui_storage_needed(void)
+{
+	return sizeof(ui_helper_data.program) + 1 + sizeof(int);
+}
+
+static int userui_save_config_info(char *buf)
+{
+	*((int *) buf) = progress_granularity;
+	memcpy(buf + sizeof(int), ui_helper_data.program, sizeof(ui_helper_data.program));
+	return sizeof(ui_helper_data.program) + sizeof(int) + 1;
+}
+
+static void userui_load_config_info(char *buf, int size)
+{
+	progress_granularity = *((int *) buf);
+	size -= sizeof(int);
+
+	/* Don't load the saved path if one has already been set */
+	if (ui_helper_changed)
+		return;
+
+	if (size > sizeof(ui_helper_data.program))
+		size = sizeof(ui_helper_data.program);
+
+	memcpy(ui_helper_data.program, buf + sizeof(int), size);
+	ui_helper_data.program[sizeof(ui_helper_data.program)-1] = '\0';
+}
+
+static void set_ui_program_set(void)
+{
+	ui_helper_changed = 1;
+}
+
+static int userui_memory_needed(void)
+{
+	/* ball park figure of 128 pages */
+	return (128 * PAGE_SIZE);
+}
+
+/* suspend_update_status
+ *
+ * Description: Update the progress bar and (if on) in-bar message.
+ * Arguments:	UL value, maximum: Current progress percentage (value/max).
+ * 		const char *fmt, ...: Message to be displayed in the middle
+ * 		of the progress bar.
+ * 		Note that a NULL message does not mean that any previous
+ * 		message is erased! For that, you need suspend_prepare_status with
+ * 		clearbar on.
+ * Returns:	Unsigned long: The next value where status needs to be updated.
+ * 		This is to reduce unnecessary calls to update_status.
+ */
+static unsigned long userui_update_status(unsigned long value,
+		unsigned long maximum, const char *fmt, ...)
+{
+	static int last_step = -1;
+	struct userui_msg_params msg;
+	int bitshift;
+	int this_step;
+	unsigned long next_update;
+
+	if (ui_helper_data.pid == -1)
+		return 0;
+
+	if ((!maximum) || (!progress_granularity))
+		return maximum;
+
+	if (value < 0)
+		value = 0;
+
+	if (value > maximum)
+		value = maximum;
+
+	/* Try to avoid math problems - we can't do 64 bit math here
+	 * (and shouldn't need it - anyone got screen resolution
+	 * of 65536 pixels or more?) */
+	bitshift = fls(maximum) - 16;
+	if (bitshift > 0) {
+		unsigned long temp_maximum = maximum >> bitshift;
+		unsigned long temp_value = value >> bitshift;
+		this_step = (int)
+			(temp_value * progress_granularity / temp_maximum);
+		next_update = (((this_step + 1) * temp_maximum /
+					progress_granularity) + 1) << bitshift;
+	} else {
+		this_step = (int) (value * progress_granularity / maximum);
+		next_update = ((this_step + 1) * maximum /
+				progress_granularity) + 1;
+	}
+
+	if (this_step == last_step)
+		return next_update;
+
+	memset(&msg, 0, sizeof(msg));
+
+	msg.a = this_step;
+	msg.b = progress_granularity;
+
+	if (fmt) {
+		va_list args;
+		va_start(args, fmt);
+		vsnprintf(msg.text, sizeof(msg.text), fmt, args);
+		va_end(args);
+		msg.text[sizeof(msg.text)-1] = '\0';
+	}
+
+	suspend_send_netlink_message(&ui_helper_data, USERUI_MSG_PROGRESS,
+			&msg, sizeof(msg));
+	last_step = this_step;
+
+	return next_update;
+}
+
+/* userui_message.
+ *
+ * Description:	This function is intended to do the same job as printk, but
+ * 		without normally logging what is printed. The point is to be
+ * 		able to get debugging info on screen without filling the logs
+ * 		with "1/534. ^M 2/534^M. 3/534^M"
+ *
+ * 		It may be called from an interrupt context - can't sleep!
+ *
+ * Arguments:	int mask: The debugging section(s) this message belongs to.
+ * 		int level: The level of verbosity of this message.
+ * 		int restartline: Whether to output a \r or \n with this line
+ * 			(\n if we're logging all output).
+ * 		const char *fmt, ...: Message to be displayed a la printk.
+ */
+static void userui_message(unsigned long section, unsigned long level,
+		int normally_logged, const char *fmt, ...)
+{
+	struct userui_msg_params msg;
+
+	if ((level) && (level > console_loglevel))
+		return;
+
+	memset(&msg, 0, sizeof(msg));
+
+	msg.a = section;
+	msg.b = level;
+	msg.c = normally_logged;
+
+	if (fmt) {
+		va_list args;
+		va_start(args, fmt);
+		vsnprintf(msg.text, sizeof(msg.text), fmt, args);
+		va_end(args);
+		msg.text[sizeof(msg.text)-1] = '\0';
+	}
+
+	if (test_action_state(SUSPEND_LOGALL))
+		printk("%s\n", msg.text);
+
+	suspend_send_netlink_message(&ui_helper_data, USERUI_MSG_MESSAGE,
+			&msg, sizeof(msg));
+}
+
+static void wait_for_key_via_userui(void)
+{
+	DECLARE_WAITQUEUE(wait, current);
+
+	add_wait_queue(&userui_wait_for_key, &wait);
+	set_current_state(TASK_INTERRUPTIBLE);
+
+	interruptible_sleep_on(&userui_wait_for_key);
+
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(&userui_wait_for_key, &wait);
+}
+
+static char userui_wait_for_keypress(int timeout)
+{
+	int fd;
+	char key = '\0';
+	struct termios t, t_backup;
+
+	if (ui_helper_data.pid != -1) {
+		wait_for_key_via_userui();
+		key = ' ';
+		goto out;
+	}
+	
+	/* We should be guaranteed /dev/console exists after populate_rootfs() in
+	 * init/main.c
+	 */
+	if ((fd = sys_open("/dev/console", O_RDONLY, 0)) < 0) {
+		printk("Couldn't open /dev/console.\n");
+		goto out;
+	}
+
+	if (sys_ioctl(fd, TCGETS, (long)&t) < 0)
+		goto out_close;
+
+	memcpy(&t_backup, &t, sizeof(t));
+
+	t.c_lflag &= ~(ISIG|ICANON|ECHO);
+	t.c_cc[VMIN] = 0;
+	if (timeout)
+		t.c_cc[VTIME] = timeout*10;
+
+	if (sys_ioctl(fd, TCSETS, (long)&t) < 0)
+		goto out_restore;
+
+	while (1) {
+		if (sys_read(fd, &key, 1) <= 0) {
+			key = '\0';
+			break;
+		}
+		key = tolower(key);
+		if (test_suspend_state(SUSPEND_SANITY_CHECK_PROMPT)) {
+			if (key == 'c') {
+				set_suspend_state(SUSPEND_CONTINUE_REQ);
+				break;
+			} else if (key == ' ')
+				break;
+		} else
+			break;
+	}
+
+out_restore:
+	sys_ioctl(fd, TCSETS, (long)&t_backup);
+out_close:
+	sys_close(fd);
+out:
+	return key;
+}
+
+/* suspend_prepare_status
+ * Description:	Prepare the 'nice display', drawing the header and version,
+ * 		along with the current action and perhaps also resetting the
+ * 		progress bar.
+ * Arguments:	
+ * 		int clearbar: Whether to reset the progress bar.
+ * 		const char *fmt, ...: The action to be displayed.
+ */
+static void userui_prepare_status(int clearbar, const char *fmt, ...)
+{
+	va_list args;
+
+	if (fmt) {
+		va_start(args, fmt);
+		lastheader_message_len = vsnprintf(lastheader, 512, fmt, args);
+		va_end(args);
+	}
+
+	if (clearbar)
+		suspend_update_status(0, 1, NULL);
+
+	suspend_message(0, SUSPEND_STATUS, 1, lastheader, NULL);
+
+	if (ui_helper_data.pid == -1)
+		printk(KERN_EMERG "%s\n", lastheader);
+}
+
+/* abort_suspend
+ *
+ * Description: Begin to abort a cycle. If this wasn't at the user's request
+ * 		(and we're displaying output), tell the user why and wait for
+ * 		them to acknowledge the message.
+ * Arguments:	A parameterised string (imagine this is printk) to display,
+ *	 	telling the user why we're aborting.
+ */
+
+static void userui_abort_suspend(int result_code, const char *fmt, ...)
+{
+	va_list args;
+	int printed_len = 0;
+
+	set_result_state(result_code);
+	if (!test_result_state(SUSPEND_ABORTED)) {
+		if (!test_result_state(SUSPEND_ABORT_REQUESTED)) {
+			va_start(args, fmt);
+			printed_len = vsnprintf(local_printf_buf, 
+					sizeof(local_printf_buf), fmt, args);
+			va_end(args);
+			if (ui_helper_data.pid != -1)
+				printed_len = sprintf(local_printf_buf + printed_len,
+					" (Press SPACE to continue)");
+			suspend_prepare_status(CLEAR_BAR, local_printf_buf);
+
+			if (ui_helper_data.pid != -1)
+				suspend_wait_for_keypress(0);
+		}
+		/* Turn on aborting flag */
+		set_result_state(SUSPEND_ABORTED);
+	}
+}
+
+/* request_abort_suspend
+ *
+ * Description:	Handle the user requesting the cancellation of a suspend by
+ * 		pressing escape.
+ * Callers:	Invoked from a netlink packet from userspace when the user presses
+ * 	 	escape.
+ */
+static void request_abort_suspend(void)
+{
+	if (test_result_state(SUSPEND_ABORT_REQUESTED))
+		return;
+
+	if (test_suspend_state(SUSPEND_NOW_RESUMING)) {
+		suspend_prepare_status(CLEAR_BAR, "Escape pressed. "
+					"Powering down again.");
+		set_suspend_state(SUSPEND_STOP_RESUME);
+		while (!test_suspend_state(SUSPEND_IO_STOPPED))
+			schedule();
+		if (suspendActiveAllocator->mark_resume_attempted)
+			suspendActiveAllocator->mark_resume_attempted(0);
+		suspend2_power_down();
+	} else {
+		suspend_prepare_status(CLEAR_BAR, "--- ESCAPE PRESSED :"
+					" ABORTING SUSPEND ---");
+		set_result_state(SUSPEND_ABORTED);
+		set_result_state(SUSPEND_ABORT_REQUESTED);
+	
+		wake_up_interruptible(&userui_wait_for_key);
+	}
+}
+
+static int userui_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	int type;
+	int *data;
+
+	type = nlh->nlmsg_type;
+
+	/* A control message: ignore them */
+	if (type < NETLINK_MSG_BASE)
+		return 0;
+
+	/* Unknown message: reply with EINVAL */
+	if (type >= USERUI_MSG_MAX)
+		return -EINVAL;
+
+	/* All operations require privileges, even GET */
+	if (security_netlink_recv(skb, CAP_NET_ADMIN))
+		return -EPERM;
+
+	/* Only allow one task to receive NOFREEZE privileges */
+	if (type == NETLINK_MSG_NOFREEZE_ME && ui_helper_data.pid != -1) {
+		printk("Got NOFREEZE_ME request when ui_helper_data.pid is %d.\n", ui_helper_data.pid);
+		return -EBUSY;
+	}
+
+	data = (int*)NLMSG_DATA(nlh);
+
+	switch (type) {
+		case USERUI_MSG_ABORT:
+			request_abort_suspend();
+			break;
+		case USERUI_MSG_GET_STATE:
+			suspend_send_netlink_message(&ui_helper_data, 
+					USERUI_MSG_GET_STATE, &suspend_action,
+					sizeof(suspend_action));
+			break;
+		case USERUI_MSG_GET_DEBUG_STATE:
+			suspend_send_netlink_message(&ui_helper_data,
+					USERUI_MSG_GET_DEBUG_STATE,
+					&suspend_debug_state,
+					sizeof(suspend_debug_state));
+			break;
+		case USERUI_MSG_SET_STATE:
+			if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+				return -EINVAL;
+			ui_nl_set_state(*data);
+			break;
+		case USERUI_MSG_SET_DEBUG_STATE:
+			if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+				return -EINVAL;
+			suspend_debug_state = (*data);
+			break;
+		case USERUI_MSG_SPACE:
+			wake_up_interruptible(&userui_wait_for_key);
+			break;
+		case USERUI_MSG_GET_POWERDOWN_METHOD:
+			suspend_send_netlink_message(&ui_helper_data,
+					USERUI_MSG_GET_POWERDOWN_METHOD,
+					&suspend2_poweroff_method,
+					sizeof(suspend2_poweroff_method));
+			break;
+		case USERUI_MSG_SET_POWERDOWN_METHOD:
+			if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+				return -EINVAL;
+			suspend2_poweroff_method = (*data);
+			break;
+		case USERUI_MSG_GET_LOGLEVEL:
+			suspend_send_netlink_message(&ui_helper_data,
+					USERUI_MSG_GET_LOGLEVEL,
+					&suspend_default_console_level,
+					sizeof(suspend_default_console_level));
+			break;
+		case USERUI_MSG_SET_LOGLEVEL:
+			if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+				return -EINVAL;
+			suspend_default_console_level = (*data);
+			break;
+	}
+
+	return 1;
+}
+
+/* userui_cond_pause
+ * 
+ * Description:	Potentially pause and wait for the user to tell us to continue.
+ * 		We normally only pause when @pause is set.
+ * Arguments:	int pause: Whether we normally pause.
+ * 		char *message: The message to display. Not parameterised
+ * 		 because it's normally a constant.
+ */
+
+static void userui_cond_pause(int pause, char *message)
+{
+	int displayed_message = 0, last_key = 0;
+	
+	while (last_key != 32 &&
+		ui_helper_data.pid != -1 &&
+		(!test_result_state(SUSPEND_ABORTED)) &&
+		((test_action_state(SUSPEND_PAUSE) && pause) || 
+		 (test_action_state(SUSPEND_SINGLESTEP)))) {
+		if (!displayed_message) {
+			suspend_prepare_status(DONT_CLEAR_BAR, 
+			   "%s Press SPACE to continue.%s",
+			   message ? message : "",
+			   (test_action_state(SUSPEND_SINGLESTEP)) ? 
+			   " Single step on." : "");
+			displayed_message = 1;
+		}
+		last_key = suspend_wait_for_keypress(0);
+	}
+	schedule();
+}
+
+/* userui_prepare_console
+ *
+ * Description:	Prepare a console for use, save current settings.
+ * Returns:	Boolean: Whether an error occured. Errors aren't
+ * 		treated as fatal, but a warning is printed.
+ */
+static void userui_prepare_console(void)
+{
+	orig_kmsg = kmsg_redirect;
+	kmsg_redirect = fg_console + 1;
+
+	ui_helper_data.pid = -1;
+
+	if (!userui_ops.enabled)
+		return;
+
+	if (!*ui_helper_data.program) {
+		printk("suspend_userui: program not configured. suspend_userui disabled.\n");
+		return;
+	}
+
+	suspend_netlink_setup(&ui_helper_data);
+
+	return;
+}
+
+/* userui_cleanup_console
+ *
+ * Description: Restore the settings we saved above.
+ */
+
+static void userui_cleanup_console(void)
+{
+	if (ui_helper_data.pid > -1)
+		suspend_netlink_close(&ui_helper_data);
+
+	kmsg_redirect = orig_kmsg;
+}
+
+/*
+ * User interface specific /sys/power/suspend2 entries.
+ */
+
+static struct suspend_sysfs_data sysfs_params[] = {
+#if defined(CONFIG_NET) && defined(CONFIG_SYSFS)
+	{ SUSPEND2_ATTR("enable_escape", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_CAN_CANCEL, 0)
+	},
+
+	{ SUSPEND2_ATTR("pause_between_steps", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_PAUSE, 0)
+	},
+
+	{ SUSPEND2_ATTR("enabled", SYSFS_RW),
+	  SYSFS_INT(&userui_ops.enabled, 0, 1, 0)
+	},
+
+	{ SUSPEND2_ATTR("progress_granularity", SYSFS_RW),
+	  SYSFS_INT(&progress_granularity, 1, 2048, 0)
+	},
+
+	{ SUSPEND2_ATTR("program", SYSFS_RW),
+	  SYSFS_STRING(ui_helper_data.program, 255, 0),
+	  .write_side_effect = set_ui_program_set,
+	},
+#endif
+};
+
+static struct suspend_module_ops userui_ops = {
+	.type				= MISC_MODULE,
+	.name				= "Userspace UI",
+	.shared_directory		= "Basic User Interface",
+	.module				= THIS_MODULE,
+	.storage_needed			= userui_storage_needed,
+	.save_config_info		= userui_save_config_info,
+	.load_config_info		= userui_load_config_info,
+	.memory_needed			= userui_memory_needed,
+	.sysfs_data			= sysfs_params,
+	.num_sysfs_entries		= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+static struct ui_ops my_ui_ops = {
+	.redraw				= userui_redraw,
+	.update_status			= userui_update_status,
+	.message			= userui_message,
+	.prepare_status			= userui_prepare_status,
+	.abort				= userui_abort_suspend,
+	.cond_pause			= userui_cond_pause,
+	.prepare			= userui_prepare_console,
+	.cleanup			= userui_cleanup_console,
+	.wait_for_key			= userui_wait_for_keypress,
+};
+
+/* suspend_console_sysfs_init
+ * Description: Boot time initialisation for user interface.
+ */
+
+static __init int s2_user_ui_init(void)
+{
+	int result;
+
+	ui_helper_data.nl = NULL;
+	ui_helper_data.program[0] = '\0';
+	ui_helper_data.pid = -1;
+	ui_helper_data.skb_size = sizeof(struct userui_msg_params);
+	ui_helper_data.pool_limit = 6;
+	ui_helper_data.netlink_id = NETLINK_SUSPEND2_USERUI;
+	ui_helper_data.name = "userspace ui";
+	ui_helper_data.rcv_msg = userui_user_rcv_msg;
+	ui_helper_data.interface_version = 7;
+	ui_helper_data.must_init = 0;
+	ui_helper_data.not_ready = userui_cleanup_console;
+	init_completion(&ui_helper_data.wait_for_process);
+	result = suspend_register_module(&userui_ops);
+	if (!result)
+		result = s2_register_ui_ops(&my_ui_ops);
+	if (result)
+		suspend_unregister_module(&userui_ops);
+
+	return result;
+}
+
+#ifdef MODULE
+static __exit void s2_user_ui_exit(void)
+{
+	s2_remove_ui_ops(&my_ui_ops);
+	suspend_unregister_module(&userui_ops);
+}
+
+module_init(s2_user_ui_init);
+module_exit(s2_user_ui_exit);
+MODULE_AUTHOR("Nigel Cunningham");
+MODULE_DESCRIPTION("Suspend2 Userui Support");
+MODULE_LICENSE("GPL");
+#else
+late_initcall(s2_user_ui_init);
+#endif
diff --git a/kernel/power/sysfs.c b/kernel/power/sysfs.c
new file mode 100644
index 0000000..47eca3b
--- /dev/null
+++ b/kernel/power/sysfs.c
@@ -0,0 +1,347 @@
+/*
+ * kernel/power/sysfs.c
+ *
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * This file contains support for sysfs entries for tuning Suspend2.
+ *
+ * We have a generic handler that deals with the most common cases, and
+ * hooks for special handlers to use.
+ */
+
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <asm/uaccess.h>
+
+#include "sysfs.h"
+#include "suspend.h"
+#include "storage.h"
+
+static int suspend_sysfs_initialised = 0;
+
+static void suspend_initialise_sysfs(void);
+
+static struct suspend_sysfs_data sysfs_params[];
+
+#define to_sysfs_data(_attr) container_of(_attr, struct suspend_sysfs_data, attr)
+
+static void suspend2_main_wrapper(void)
+{
+	_suspend2_try_suspend(0);
+}
+
+static ssize_t suspend2_attr_show(struct kobject *kobj, struct attribute *attr,
+			      char *page)
+{
+	struct suspend_sysfs_data *sysfs_data = to_sysfs_data(attr);
+	int len = 0;
+
+	if (suspend_start_anything(0))
+		return -EBUSY;
+
+	if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_READ)
+		suspend_prepare_usm();
+	
+	switch (sysfs_data->type) {
+		case SUSPEND_SYSFS_DATA_CUSTOM:
+			len = (sysfs_data->data.special.read_sysfs) ?
+				(sysfs_data->data.special.read_sysfs)(page, PAGE_SIZE)
+				: 0;
+			break;
+		case SUSPEND_SYSFS_DATA_BIT:
+			len = sprintf(page, "%d\n", 
+				-test_bit(sysfs_data->data.bit.bit,
+					sysfs_data->data.bit.bit_vector));
+			break;
+		case SUSPEND_SYSFS_DATA_INTEGER:
+			len = sprintf(page, "%d\n",
+				*(sysfs_data->data.integer.variable));
+			break;
+		case SUSPEND_SYSFS_DATA_LONG:
+			len = sprintf(page, "%ld\n",
+				*(sysfs_data->data.a_long.variable));
+			break;
+		case SUSPEND_SYSFS_DATA_UL:
+			len = sprintf(page, "%lu\n",
+				*(sysfs_data->data.ul.variable));
+			break;
+		case SUSPEND_SYSFS_DATA_STRING:
+			len = sprintf(page, "%s\n",
+				sysfs_data->data.string.variable);
+			break;
+	}
+	/* Side effect routine? */
+	if (sysfs_data->read_side_effect)
+		sysfs_data->read_side_effect();
+
+	if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_READ)
+		suspend_cleanup_usm();
+
+	suspend_finish_anything(0);
+
+	return len;
+}
+
+#define BOUND(_variable, _type) \
+	if (*_variable < sysfs_data->data._type.minimum) \
+		*_variable = sysfs_data->data._type.minimum; \
+	else if (*_variable > sysfs_data->data._type.maximum) \
+		*_variable = sysfs_data->data._type.maximum;
+
+static ssize_t suspend2_attr_store(struct kobject *kobj, struct attribute *attr,
+		const char *my_buf, size_t count)
+{
+	int assigned_temp_buffer = 0, result = count;
+	struct suspend_sysfs_data *sysfs_data = to_sysfs_data(attr);
+
+	if (suspend_start_anything((sysfs_data->flags & SYSFS_SUSPEND_OR_RESUME)))
+		return -EBUSY;
+
+	((char *) my_buf)[count] = 0;
+
+	if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_WRITE)
+		suspend_prepare_usm();
+
+	switch (sysfs_data->type) {
+		case SUSPEND_SYSFS_DATA_CUSTOM:
+			if (sysfs_data->data.special.write_sysfs)
+				result = (sysfs_data->data.special.write_sysfs)
+					(my_buf, count);
+			break;
+		case SUSPEND_SYSFS_DATA_BIT:
+			{
+			int value = simple_strtoul(my_buf, NULL, 0);
+			if (value)
+				set_bit(sysfs_data->data.bit.bit, 
+					(sysfs_data->data.bit.bit_vector));
+			else
+				clear_bit(sysfs_data->data.bit.bit,
+					(sysfs_data->data.bit.bit_vector));
+			}
+			break;
+		case SUSPEND_SYSFS_DATA_INTEGER:
+			{
+				int *variable = sysfs_data->data.integer.variable;
+				*variable = simple_strtol(my_buf, NULL, 0);
+				BOUND(variable, integer);
+				break;
+			}
+		case SUSPEND_SYSFS_DATA_LONG:
+			{
+				long *variable = sysfs_data->data.a_long.variable;
+				*variable = simple_strtol(my_buf, NULL, 0);
+				BOUND(variable, a_long);
+				break;
+			}
+		case SUSPEND_SYSFS_DATA_UL:
+			{
+				unsigned long *variable = sysfs_data->data.ul.variable;
+				*variable = simple_strtoul(my_buf, NULL, 0);
+				BOUND(variable, ul);
+				break;
+			}
+			break;
+		case SUSPEND_SYSFS_DATA_STRING:
+			{
+				int copy_len = count;
+				char *variable =
+					sysfs_data->data.string.variable;
+
+				if (sysfs_data->data.string.max_length &&
+				    (copy_len > sysfs_data->data.string.max_length))
+					copy_len = sysfs_data->data.string.max_length;
+
+				if (!variable) {
+					sysfs_data->data.string.variable =
+						variable = (char *) get_zeroed_page(GFP_ATOMIC);
+					assigned_temp_buffer = 1;
+				}
+				strncpy(variable, my_buf, copy_len);
+				if ((copy_len) &&
+					 (my_buf[copy_len - 1] == '\n'))
+					variable[count - 1] = 0;
+				variable[count] = 0;
+			}
+			break;
+	}
+
+	/* Side effect routine? */
+	if (sysfs_data->write_side_effect)
+		sysfs_data->write_side_effect();
+
+	/* Free temporary buffers */
+	if (assigned_temp_buffer) {
+		free_page((unsigned long) sysfs_data->data.string.variable);
+		sysfs_data->data.string.variable = NULL;
+	}
+
+	if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_WRITE)
+		suspend_cleanup_usm();
+
+	suspend_finish_anything(sysfs_data->flags & SYSFS_SUSPEND_OR_RESUME);
+
+	return result;
+}
+
+static struct sysfs_ops suspend2_sysfs_ops = {
+	.show	= &suspend2_attr_show,
+	.store	= &suspend2_attr_store,
+};
+
+static struct kobj_type suspend2_ktype = {
+	.sysfs_ops	= &suspend2_sysfs_ops,
+};
+
+decl_subsys(suspend2, &suspend2_ktype, NULL);
+
+/* Non-module sysfs entries.
+ *
+ * This array contains entries that are automatically registered at
+ * boot. Modules and the console code register their own entries separately.
+ *
+ * NB: If you move do_suspend, change suspend_write_sysfs's test so that
+ * suspend_start_anything still gets a 1 when the user echos > do_suspend!
+ */
+
+static struct suspend_sysfs_data sysfs_params[] = {
+	{ SUSPEND2_ATTR("do_suspend", SYSFS_WRITEONLY),
+	  SYSFS_CUSTOM(NULL, NULL, SYSFS_SUSPENDING),
+	  .write_side_effect = suspend2_main_wrapper
+	},
+
+	{ SUSPEND2_ATTR("do_resume", SYSFS_WRITEONLY),
+	  SYSFS_CUSTOM(NULL, NULL, SYSFS_RESUMING),
+	  .write_side_effect = __suspend2_try_resume
+	},
+
+};
+
+void remove_suspend2_sysdir(struct kobject *kobj)
+{
+	if (!kobj)
+		return;
+
+	kobject_unregister(kobj);
+
+	kfree(kobj);
+}
+
+struct kobject *make_suspend2_sysdir(char *name)
+{
+	struct kobject *kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
+	int err;
+
+	if(!kobj) {
+		printk("Suspend2: Can't allocate kobject for sysfs dir!\n");
+		return NULL;
+	}
+
+	err = kobject_set_name(kobj, "%s", name);
+
+	if (err) {
+		kfree(kobj);
+		return NULL;
+	}
+
+	kobj->kset = &suspend2_subsys.kset;
+
+	err = kobject_register(kobj);
+
+	if (err)
+		kfree(kobj);
+
+	return err ? NULL : kobj;
+}
+
+/* suspend_register_sysfs_file
+ *
+ * Helper for registering a new /sysfs/suspend2 entry.
+ */
+
+int suspend_register_sysfs_file(
+		struct kobject *kobj,
+		struct suspend_sysfs_data *suspend_sysfs_data)
+{
+	int result;
+
+	if (!suspend_sysfs_initialised)
+		suspend_initialise_sysfs();
+
+	if ((result = sysfs_create_file(kobj, &suspend_sysfs_data->attr)))
+		printk("Suspend2: sysfs_create_file for %s returned %d.\n",
+			suspend_sysfs_data->attr.name, result);
+
+	return result;
+}
+
+/* suspend_unregister_sysfs_file
+ *
+ * Helper for removing unwanted /sys/power/suspend2 entries.
+ *
+ */
+void suspend_unregister_sysfs_file(struct kobject *kobj,
+		struct suspend_sysfs_data *suspend_sysfs_data)
+{
+	sysfs_remove_file(kobj, &suspend_sysfs_data->attr);
+}
+
+void suspend_cleanup_sysfs(void)
+{
+	int i,
+	    numfiles = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data);
+
+	if (!suspend_sysfs_initialised)
+		return;
+
+	for (i=0; i< numfiles; i++)
+		suspend_unregister_sysfs_file(&suspend2_subsys.kset.kobj,
+				&sysfs_params[i]);
+
+	kobj_set_kset_s(&suspend2_subsys.kset, power_subsys);
+	subsystem_unregister(&suspend2_subsys);
+
+	suspend_sysfs_initialised = 0;
+}
+
+/* suspend_initialise_sysfs
+ *
+ * Initialise the /sysfs/suspend2 directory.
+ */
+
+static void suspend_initialise_sysfs(void)
+{
+	int i, error;
+	int numfiles = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data);
+	
+	if (suspend_sysfs_initialised)
+		return;
+
+	/* Make our suspend2 directory a child of /sys/power */
+	kobj_set_kset_s(&suspend2_subsys.kset, power_subsys);
+	error = subsystem_register(&suspend2_subsys);
+
+	if (error)
+		return;
+
+	/* Make it use the .store and .show routines above */
+	kobj_set_kset_s(&suspend2_subsys.kset, suspend2_subsys);
+
+	suspend_sysfs_initialised = 1;
+
+	for (i=0; i< numfiles; i++)
+		suspend_register_sysfs_file(&suspend2_subsys.kset.kobj,
+				&sysfs_params[i]);
+}
+
+int s2_sysfs_init(void)
+{
+	suspend_initialise_sysfs();
+	return 0;
+}
+
+void s2_sysfs_exit(void)
+{
+	suspend_cleanup_sysfs();
+}
diff --git a/kernel/power/sysfs.h b/kernel/power/sysfs.h
new file mode 100644
index 0000000..aad5e26
--- /dev/null
+++ b/kernel/power/sysfs.h
@@ -0,0 +1,132 @@
+/*
+ * kernel/power/sysfs.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * It provides declarations for suspend to use in managing
+ * /sysfs/suspend2. When we switch to kobjects,
+ * this will become redundant.
+ *
+ */
+
+#include <linux/sysfs.h>
+#include "power.h"
+
+struct suspend_sysfs_data {
+	struct attribute attr;
+	int type;
+	int flags;
+	union {
+		struct {
+			unsigned long *bit_vector;
+			int bit;
+		} bit;
+		struct {
+			int *variable;
+			int minimum;
+			int maximum;
+		} integer;
+		struct {
+			long *variable;
+			long minimum;
+			long maximum;
+		} a_long;
+		struct {
+			unsigned long *variable;
+			unsigned long minimum;
+			unsigned long maximum;
+		} ul;
+		struct {
+			char *variable;
+			int max_length;
+		} string;
+		struct {
+			int (*read_sysfs) (const char *buffer, int count);
+			int (*write_sysfs) (const char *buffer, int count);
+			void *data;
+		} special;
+	} data;
+	
+	/* Side effects routines. Used, eg, for reparsing the
+	 * resume2 entry when it changes */
+	void (*read_side_effect) (void);
+	void (*write_side_effect) (void); 
+	struct list_head sysfs_data_list;
+};
+
+enum {
+	SUSPEND_SYSFS_DATA_NONE = 1,
+	SUSPEND_SYSFS_DATA_CUSTOM,
+	SUSPEND_SYSFS_DATA_BIT,
+	SUSPEND_SYSFS_DATA_INTEGER,
+	SUSPEND_SYSFS_DATA_UL,
+	SUSPEND_SYSFS_DATA_LONG,
+	SUSPEND_SYSFS_DATA_STRING
+};
+
+#define SUSPEND2_ATTR(_name, _mode)      \
+        .attr = {.name  = _name , .mode   = _mode }
+
+#define SYSFS_BIT(_ul, _bit, _flags) \
+	.type = SUSPEND_SYSFS_DATA_BIT, \
+	.flags = _flags, \
+	.data = { .bit = { .bit_vector = _ul, .bit = _bit } }
+
+#define SYSFS_INT(_int, _min, _max, _flags) \
+	.type = SUSPEND_SYSFS_DATA_INTEGER, \
+	.flags = _flags, \
+	.data = { .integer = { .variable = _int, .minimum = _min, \
+			.maximum = _max } }
+
+#define SYSFS_UL(_ul, _min, _max, _flags) \
+	.type = SUSPEND_SYSFS_DATA_UL, \
+	.flags = _flags, \
+	.data = { .ul = { .variable = _ul, .minimum = _min, \
+			.maximum = _max } }
+
+#define SYSFS_LONG(_long, _min, _max, _flags) \
+	.type = SUSPEND_SYSFS_DATA_LONG, \
+	.flags = _flags, \
+	.data = { .a_long = { .variable = _long, .minimum = _min, \
+			.maximum = _max } }
+
+#define SYSFS_STRING(_string, _max_len, _flags) \
+	.type = SUSPEND_SYSFS_DATA_STRING, \
+	.flags = _flags, \
+	.data = { .string = { .variable = _string, .max_length = _max_len } }
+
+#define SYSFS_CUSTOM(_read, _write, _flags) \
+	.type = SUSPEND_SYSFS_DATA_CUSTOM, \
+	.flags = _flags, \
+	.data = { .special = { .read_sysfs = _read, .write_sysfs = _write } }
+
+#define SYSFS_WRITEONLY 0200
+#define SYSFS_READONLY 0444
+#define SYSFS_RW 0644
+
+/* Flags */
+#define SYSFS_NEEDS_SM_FOR_READ 1
+#define SYSFS_NEEDS_SM_FOR_WRITE 2
+#define SYSFS_SUSPEND 4
+#define SYSFS_RESUME 8
+#define SYSFS_SUSPEND_OR_RESUME (SYSFS_SUSPEND | SYSFS_RESUME)
+#define SYSFS_SUSPENDING (SYSFS_SUSPEND | SYSFS_NEEDS_SM_FOR_WRITE)
+#define SYSFS_RESUMING (SYSFS_RESUME | SYSFS_NEEDS_SM_FOR_WRITE)
+#define SYSFS_NEEDS_SM_FOR_BOTH \
+ (SYSFS_NEEDS_SM_FOR_READ | SYSFS_NEEDS_SM_FOR_WRITE)
+
+int suspend_register_sysfs_file(struct kobject *kobj,
+		struct suspend_sysfs_data *suspend_sysfs_data);
+void suspend_unregister_sysfs_file(struct kobject *kobj,
+		struct suspend_sysfs_data *suspend_sysfs_data);
+
+extern struct subsystem suspend2_subsys;
+
+struct kobject *make_suspend2_sysdir(char *name);
+void remove_suspend2_sysdir(struct kobject *obj);
+extern void suspend_cleanup_sysfs(void);
+
+extern int s2_sysfs_init(void);
+extern void s2_sysfs_exit(void);
diff --git a/kernel/power/ui.c b/kernel/power/ui.c
new file mode 100644
index 0000000..5b6789f
--- /dev/null
+++ b/kernel/power/ui.c
@@ -0,0 +1,235 @@
+/*
+ * kernel/power/ui.c
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr>
+ * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for Suspend2's user interface.
+ *
+ * The user interface code talks to a userspace program via a
+ * netlink socket.
+ *
+ * The kernel side:
+ * - starts the userui program;
+ * - sends text messages and progress bar status;
+ *
+ * The user space side:
+ * - passes messages regarding user requests (abort, toggle reboot etc)
+ *
+ */
+
+#define __KERNEL_SYSCALLS__
+
+#include <linux/suspend.h>
+#include <linux/freezer.h>
+#include <linux/console.h>
+#include <linux/ctype.h>
+#include <linux/tty.h>
+#include <linux/vt_kern.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/kmod.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+ 
+#include "sysfs.h"
+#include "modules.h"
+#include "suspend.h"
+#include "ui.h"
+#include "netlink.h"
+#include "power_off.h"
+
+static char local_printf_buf[1024];	/* Same as printk - should be safe */
+struct ui_ops *s2_current_ui;
+
+/*! The console log level we default to. */
+int suspend_default_console_level = 0;
+
+/* suspend_early_boot_message()
+ * Description:	Handle errors early in the process of booting.
+ * 		The user may press C to continue booting, perhaps
+ * 		invalidating the image,  or space to reboot. 
+ * 		This works from either the serial console or normally 
+ * 		attached keyboard.
+ *
+ * 		Note that we come in here from init, while the kernel is
+ * 		locked. If we want to get events from the serial console,
+ * 		we need to temporarily unlock the kernel.
+ *
+ * 		suspend_early_boot_message may also be called post-boot.
+ * 		In this case, it simply printks the message and returns.
+ *
+ * Arguments:	int	Whether we are able to erase the image.
+ * 		int	default_answer. What to do when we timeout. This
+ * 			will normally be continue, but the user might
+ * 			provide command line options (__setup) to override
+ * 			particular cases.
+ * 		Char *. Pointer to a string explaining why we're moaning.
+ */
+
+#define say(message, a...) printk(KERN_EMERG message, ##a)
+#define message_timeout 25 /* message_timeout * 10 must fit in 8 bits */
+
+int suspend_early_boot_message(int message_detail, int default_answer, char *warning_reason, ...)
+{
+	unsigned long orig_state = get_suspend_state(), continue_req = 0;
+	unsigned long orig_loglevel = console_loglevel;
+	va_list args;
+	int printed_len;
+
+	if (warning_reason) {
+		va_start(args, warning_reason);
+		printed_len = vsnprintf(local_printf_buf, 
+				sizeof(local_printf_buf), 
+				warning_reason,
+				args);
+		va_end(args);
+	}
+
+	if (!test_suspend_state(SUSPEND_BOOT_TIME)) {
+		printk("Suspend2: %s\n", local_printf_buf);
+		return default_answer;
+	}
+
+	/* We might be called directly from do_mounts_initrd if the
+	 * user fails to set up their initrd properly. We need to
+	 * enable the keyboard handler by setting the running flag */
+	set_suspend_state(SUSPEND_RUNNING);
+
+#if defined(CONFIG_VT) || defined(CONFIG_SERIAL_CONSOLE)
+	console_loglevel = 7;
+
+	say("=== Suspend2 ===\n\n");
+	if (warning_reason) {
+		say("BIG FAT WARNING!! %s\n\n", local_printf_buf);
+		switch (message_detail) {
+		 case 0:
+			say("If you continue booting, note that any image WILL NOT BE REMOVED.\n");
+			say("Suspend is unable to do so because the appropriate modules aren't\n");
+			say("loaded. You should manually remove the image to avoid any\n");
+			say("possibility of corrupting your filesystem(s) later.\n");
+			break;
+		 case 1:
+			say("If you want to use the current suspend image, reboot and try\n");
+			say("again with the same kernel that you suspended from. If you want\n");
+			say("to forget that image, continue and the image will be erased.\n");
+			break;
+		}
+		say("Press SPACE to reboot or C to continue booting with this kernel\n\n");
+		say("Default action if you don't select one in %d seconds is: %s.\n",
+			message_timeout,
+			default_answer == SUSPEND_CONTINUE_REQ ?
+			"continue booting" : "reboot");
+	} else {
+		say("BIG FAT WARNING!!\n\n");
+		say("You have tried to resume from this image before.\n");
+		say("If it failed once, it may well fail again.\n");
+		say("Would you like to remove the image and boot normally?\n");
+		say("This will be equivalent to entering noresume2 on the\n");
+		say("kernel command line.\n\n");
+		say("Press SPACE to remove the image or C to continue resuming.\n\n");
+		say("Default action if you don't select one in %d seconds is: %s.\n",
+			message_timeout,
+			!!default_answer ?
+			"continue resuming" : "remove the image");
+	}
+	console_loglevel = orig_loglevel;
+	
+	set_suspend_state(SUSPEND_SANITY_CHECK_PROMPT);
+	clear_suspend_state(SUSPEND_CONTINUE_REQ);
+
+	if (suspend_wait_for_keypress(message_timeout) == 0) /* We timed out */
+		continue_req = !!default_answer;
+	else
+		continue_req = test_suspend_state(SUSPEND_CONTINUE_REQ);
+
+	if ((warning_reason) && (!continue_req))
+		machine_restart(NULL);
+	
+	restore_suspend_state(orig_state);
+	if (continue_req)
+		set_suspend_state(SUSPEND_CONTINUE_REQ);
+
+#endif /* CONFIG_VT or CONFIG_SERIAL_CONSOLE */
+	return -EIO;
+}
+#undef say
+
+/*
+ * User interface specific /sys/power/suspend2 entries.
+ */
+
+static struct suspend_sysfs_data sysfs_params[] = {
+#if defined(CONFIG_NET) && defined(CONFIG_SYSFS)
+	{ SUSPEND2_ATTR("default_console_level", SYSFS_RW),
+	  SYSFS_INT(&suspend_default_console_level, 0, 7, 0)
+	},
+
+	{ SUSPEND2_ATTR("debug_sections", SYSFS_RW),
+	  SYSFS_UL(&suspend_debug_state, 0, 1 << 30, 0)
+	},
+
+	{ SUSPEND2_ATTR("log_everything", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_LOGALL, 0)
+	},
+#endif
+	{ SUSPEND2_ATTR("pm_prepare_console", SYSFS_RW),
+	  SYSFS_BIT(&suspend_action, SUSPEND_PM_PREPARE_CONSOLE, 0)
+	}
+};
+
+static struct suspend_module_ops userui_ops = {
+	.type				= MISC_MODULE,
+	.name				= "Basic User Interface",
+	.directory			= "user_interface",
+	.module				= THIS_MODULE,
+	.sysfs_data			= sysfs_params,
+	.num_sysfs_entries		= sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data),
+};
+
+int s2_register_ui_ops(struct ui_ops *this_ui)
+{
+	if (s2_current_ui) {
+		printk("Only one Suspend2 user interface module can be loaded"
+			" at a time.");
+		return -EBUSY;
+	}
+
+	s2_current_ui = this_ui;
+
+	return 0;
+}
+
+void s2_remove_ui_ops(struct ui_ops *this_ui)
+{
+	if (s2_current_ui != this_ui)
+		return;
+
+	s2_current_ui = NULL;
+}
+
+/* suspend_console_sysfs_init
+ * Description: Boot time initialisation for user interface.
+ */
+
+int s2_ui_init(void)
+{
+	return suspend_register_module(&userui_ops);
+}
+
+void s2_ui_exit(void)
+{
+	suspend_unregister_module(&userui_ops);
+}
+
+#ifdef CONFIG_SUSPEND2_EXPORTS
+EXPORT_SYMBOL_GPL(s2_current_ui);
+EXPORT_SYMBOL_GPL(suspend_early_boot_message);
+EXPORT_SYMBOL_GPL(s2_register_ui_ops);
+EXPORT_SYMBOL_GPL(s2_remove_ui_ops);
+EXPORT_SYMBOL_GPL(suspend_default_console_level);
+#endif
diff --git a/kernel/power/ui.h b/kernel/power/ui.h
new file mode 100644
index 0000000..2d1034c
--- /dev/null
+++ b/kernel/power/ui.h
@@ -0,0 +1,108 @@
+/*
+ * kernel/power/ui.h
+ *
+ * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net)
+ */
+
+enum {
+	DONT_CLEAR_BAR,
+	CLEAR_BAR
+};
+
+enum {
+	/* Userspace -> Kernel */
+	USERUI_MSG_ABORT = 0x11,
+	USERUI_MSG_SET_STATE = 0x12,
+	USERUI_MSG_GET_STATE = 0x13,
+	USERUI_MSG_GET_DEBUG_STATE = 0x14,
+	USERUI_MSG_SET_DEBUG_STATE = 0x15,
+	USERUI_MSG_SPACE = 0x18,
+	USERUI_MSG_GET_POWERDOWN_METHOD = 0x1A,
+	USERUI_MSG_SET_POWERDOWN_METHOD = 0x1B,
+	USERUI_MSG_GET_LOGLEVEL = 0x1C,
+	USERUI_MSG_SET_LOGLEVEL = 0x1D,
+
+	/* Kernel -> Userspace */
+	USERUI_MSG_MESSAGE = 0x21,
+	USERUI_MSG_PROGRESS = 0x22,
+	USERUI_MSG_REDRAW = 0x25,
+
+	USERUI_MSG_MAX,
+};
+
+struct userui_msg_params {
+	unsigned long a, b, c, d;
+	char text[255];
+};
+
+struct ui_ops {
+	char (*wait_for_key) (int timeout);
+	unsigned long (*update_status) (unsigned long value,
+		unsigned long maximum, const char *fmt, ...);
+	void (*prepare_status) (int clearbar, const char *fmt, ...);
+	void (*cond_pause) (int pause, char *message);
+	void (*abort)(int result_code, const char *fmt, ...);
+	void (*prepare)(void);
+	void (*cleanup)(void);
+	void (*redraw)(void);
+	void (*message)(unsigned long section, unsigned long level,
+		int normally_logged, const char *fmt, ...);
+};
+
+extern struct ui_ops *s2_current_ui;
+
+#define suspend_update_status(val, max, fmt, args...) \
+ (s2_current_ui ? (s2_current_ui->update_status) (val, max, fmt, ##args) : max)
+
+#define suspend_wait_for_keypress(timeout) \
+ (s2_current_ui ? (s2_current_ui->wait_for_key) (timeout) : 0)
+
+#define suspend_ui_redraw(void) \
+	do { if (s2_current_ui) \
+		(s2_current_ui->redraw)(); \
+	} while(0)
+
+#define suspend_prepare_console(void) \
+	do { if (s2_current_ui) \
+		(s2_current_ui->prepare)(); \
+	} while(0)
+
+#define suspend_cleanup_console(void) \
+	do { if (s2_current_ui) \
+		(s2_current_ui->cleanup)(); \
+	} while(0)
+
+#define abort_suspend(result, fmt, args...) \
+	do { if (s2_current_ui) \
+		(s2_current_ui->abort)(result, fmt, ##args); \
+	     else { \
+		set_result_state(SUSPEND_ABORTED); \
+		set_result_state(result); \
+	     } \
+	} while(0)
+
+#define suspend_cond_pause(pause, message) \
+	do { if (s2_current_ui) \
+		(s2_current_ui->cond_pause)(pause, message); \
+	} while(0)
+
+#define suspend_prepare_status(clear, fmt, args...) \
+	do { if (s2_current_ui) \
+		(s2_current_ui->prepare_status)(clear, fmt, ##args); \
+	     else \
+		printk(fmt, ##args); \
+	} while(0)
+
+extern int suspend_default_console_level;
+
+#define suspend_message(sn, lev, log, fmt, a...) \
+do { \
+	if (s2_current_ui && (!sn || test_debug_state(sn))) \
+		s2_current_ui->message(sn, lev, log, fmt, ##a); \
+} while(0)
+
+__exit void suspend_ui_cleanup(void);
+extern int s2_ui_init(void);
+extern void s2_ui_exit(void);
+extern int s2_register_ui_ops(struct ui_ops *this_ui);
+extern void s2_remove_ui_ops(struct ui_ops *this_ui);
diff --git a/kernel/printk.c b/kernel/printk.c
index 4b47e59..6cafd3b 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -32,6 +32,7 @@
 #include <linux/bootmem.h>
 #include <linux/syscalls.h>
 #include <linux/jiffies.h>
+#include <linux/suspend.h>
 
 #include <asm/uaccess.h>
 
@@ -92,9 +93,9 @@ static DEFINE_SPINLOCK(logbuf_lock);
  * The indices into log_buf are not constrained to log_buf_len - they
  * must be masked before subscripting
  */
-static unsigned long log_start;	/* Index into log_buf: next char to be read by syslog() */
-static unsigned long con_start;	/* Index into log_buf: next char to be sent to consoles */
-static unsigned long log_end;	/* Index into log_buf: most-recently-written-char + 1 */
+static unsigned long POSS_NOSAVE log_start;	/* Index into log_buf: next char to be read by syslog() */
+static unsigned long POSS_NOSAVE con_start;	/* Index into log_buf: next char to be sent to consoles */
+static unsigned long POSS_NOSAVE log_end;	/* Index into log_buf: most-recently-written-char + 1 */
 
 /*
  *	Array of consoles built from command line options (console=)
@@ -117,10 +118,10 @@ static int console_may_schedule;
 
 #ifdef CONFIG_PRINTK
 
-static char __log_buf[__LOG_BUF_LEN];
-static char *log_buf = __log_buf;
-static int log_buf_len = __LOG_BUF_LEN;
-static unsigned long logged_chars; /* Number of chars produced since last read+clear operation */
+static char POSS_NOSAVE __log_buf[__LOG_BUF_LEN];
+static char POSS_NOSAVE *log_buf = __log_buf;
+static int POSS_NOSAVE log_buf_len = __LOG_BUF_LEN;
+static unsigned long POSS_NOSAVE logged_chars; /* Number of chars produced since last read+clear operation */
 
 static int __init log_buf_len_setup(char *str)
 {
@@ -739,12 +740,14 @@ void suspend_console(void)
 	acquire_console_sem();
 	console_suspended = 1;
 }
+EXPORT_SYMBOL(suspend_console);
 
 void resume_console(void)
 {
 	console_suspended = 0;
 	release_console_sem();
 }
+EXPORT_SYMBOL(resume_console);
 #endif /* CONFIG_DISABLE_CONSOLE_SUSPEND */
 
 /**
diff --git a/kernel/timer.c b/kernel/timer.c
index dd6c2c1..aded05d 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1240,6 +1240,38 @@ unsigned long avenrun[3];
 
 EXPORT_SYMBOL(avenrun);
 
+static unsigned long avenrun_save[3];
+/*
+ * save_avenrun - Record the values prior to starting a hibernation cycle.
+ * We do this to make the work done in hibernation invisible to userspace
+ * post-suspend. Some programs, including some MTAs, watch the load average
+ * and stop work until it lowers. Without this, they would stop working for
+ * a while post-resume, unnecessarily.
+ */
+
+void save_avenrun(void)
+{
+	avenrun_save[0] = avenrun[0];
+	avenrun_save[1] = avenrun[1];
+	avenrun_save[2] = avenrun[2];
+}
+
+EXPORT_SYMBOL_GPL(save_avenrun);
+
+void restore_avenrun(void)
+{
+	if (!avenrun_save[0])
+		return;
+
+	avenrun[0] = avenrun_save[0];
+	avenrun[1] = avenrun_save[1];
+	avenrun[2] = avenrun_save[2];
+
+	avenrun_save[0] = 0;
+}
+
+EXPORT_SYMBOL_GPL(restore_avenrun);
+
 /*
  * calc_load - given tick count, update the avenrun load estimates.
  * This is called while holding a write_lock on xtime_lock.
diff --git a/lib/Kconfig b/lib/Kconfig
index 3842499..758a928 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -47,6 +47,9 @@ config AUDIT_GENERIC
 	depends on AUDIT && !AUDIT_ARCH
 	default y
 
+config DYN_PAGEFLAGS
+	bool
+
 #
 # compression support is select'ed if needed
 #
diff --git a/lib/Makefile b/lib/Makefile
index 992a39e..b974998 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -38,6 +38,9 @@ ifneq ($(CONFIG_HAVE_DEC_LOCK),y)
 endif
 
 obj-$(CONFIG_BITREVERSE) += bitrev.o
+
+obj-$(CONFIG_DYN_PAGEFLAGS) += dyn_pageflags.o
+
 obj-$(CONFIG_CRC_CCITT)	+= crc-ccitt.o
 obj-$(CONFIG_CRC16)	+= crc16.o
 obj-$(CONFIG_CRC32)	+= crc32.o
diff --git a/lib/dyn_pageflags.c b/lib/dyn_pageflags.c
new file mode 100644
index 0000000..963ac5c
--- /dev/null
+++ b/lib/dyn_pageflags.c
@@ -0,0 +1,312 @@
+/*
+ * lib/dyn_pageflags.c
+ *
+ * Copyright (C) 2004-2006 Nigel Cunningham <nigel@suspend2.net>
+ * 
+ * This file is released under the GPLv2.
+ *
+ * Routines for dynamically allocating and releasing bitmaps
+ * used as pseudo-pageflags.
+ */
+
+#include <linux/module.h>
+#include <linux/dyn_pageflags.h>
+#include <linux/bootmem.h>
+#include <linux/mm.h>
+
+#if 0
+#define PR_DEBUG(a, b...) do { printk(a, ##b); } while(0)
+#else
+#define PR_DEBUG(a, b...) do { } while(0)
+#endif
+
+#define pages_for_zone(zone) \
+	(DIV_ROUND_UP((zone)->spanned_pages, (PAGE_SIZE << 3)))
+
+/* 
+ * clear_dyn_pageflags(dyn_pageflags_t pagemap)
+ *
+ * Clear an array used to store local page flags.
+ *
+ */
+
+void clear_dyn_pageflags(dyn_pageflags_t pagemap)
+{
+	int i = 0, zone_idx, node_id = 0;
+	struct zone *zone;
+	struct pglist_data *pgdat;
+	
+	BUG_ON(!pagemap);
+
+	for_each_online_pgdat(pgdat) {
+		for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+			zone = &pgdat->node_zones[zone_idx];
+
+			if (!populated_zone(zone))
+				continue;
+
+			for (i = 0; i < pages_for_zone(zone); i++)
+				memset((pagemap[node_id][zone_idx][i]), 0,
+						PAGE_SIZE);
+		}
+		node_id++;
+	}
+}
+
+/* 
+ * free_dyn_pageflags(dyn_pageflags_t pagemap)
+ *
+ * Free a dynamically allocated pageflags bitmap. For Suspend2 usage, we
+ * support data being relocated from slab to pages that don't conflict
+ * with the image that will be copied back. This is the reason for the
+ * PageSlab tests below.
+ *
+ */
+void free_dyn_pageflags(dyn_pageflags_t *pagemap)
+{
+	int i = 0, zone_pages, node_id = -1, zone_idx;
+	struct zone *zone;
+	struct pglist_data *pgdat;
+
+	if (!*pagemap)
+		return;
+	
+	PR_DEBUG("Seeking to free dyn_pageflags %p.\n", pagemap);
+
+	for_each_online_pgdat(pgdat) {
+		node_id++;
+
+		PR_DEBUG("Node id %d.\n", node_id);
+
+		if (!(*pagemap)[node_id]) {
+			PR_DEBUG("Node %d unallocated.\n", node_id);
+			continue;
+		}
+		
+		for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+			zone = &pgdat->node_zones[zone_idx];
+			if (!populated_zone(zone)) {
+				PR_DEBUG("Node %d zone %d unpopulated.\n", node_id, zone_idx);
+				continue;
+			}
+
+			if (!(*pagemap)[node_id][zone_idx]) {
+				PR_DEBUG("Node %d zone %d unallocated.\n", node_id, zone_idx);
+				continue;
+			}
+
+			PR_DEBUG("Node id %d. Zone %d.\n", node_id, zone_idx);
+
+			zone_pages = pages_for_zone(zone);
+
+			for (i = 0; i < zone_pages; i++) {
+				PR_DEBUG("Node id %d. Zone %d. Page %d.\n", node_id, zone_idx, i);
+				free_page((unsigned long)(*pagemap)[node_id][zone_idx][i]);
+			}
+
+			kfree((*pagemap)[node_id][zone_idx]);
+		}
+		PR_DEBUG("Free node %d (%p).\n", node_id, pagemap[node_id]);
+		kfree((*pagemap)[node_id]);
+	}
+
+	PR_DEBUG("Free map pgdat list at %p.\n", pagemap);
+	kfree(*pagemap);
+
+	*pagemap = NULL;
+	PR_DEBUG("Done.\n");
+	return;
+}
+
+static int try_alloc_dyn_pageflag_part(int nr_ptrs, void **ptr)
+{
+	*ptr = kzalloc(sizeof(void *) * nr_ptrs, GFP_ATOMIC);
+	PR_DEBUG("Got %p. Putting it in %p.\n", *ptr, ptr);
+
+	if (*ptr)
+		return 0;
+
+	printk("Error. Unable to allocate memory for dynamic pageflags.");
+	return -ENOMEM;
+}
+
+/* 
+ * allocate_dyn_pageflags
+ *
+ * Allocate a bitmap for dynamic page flags.
+ *
+ */
+int allocate_dyn_pageflags(dyn_pageflags_t *pagemap)
+{
+	int i, zone_idx, zone_pages, node_id = 0;
+	struct zone *zone;
+	struct pglist_data *pgdat;
+
+	if (*pagemap) {
+		PR_DEBUG("Pagemap %p already allocated.\n", pagemap);
+		return 0;
+	}
+
+	PR_DEBUG("Seeking to allocate dyn_pageflags %p.\n", pagemap);
+
+	for_each_online_pgdat(pgdat)
+		node_id++;
+
+	if (try_alloc_dyn_pageflag_part(node_id, (void **) pagemap))
+		return -ENOMEM;
+
+	node_id = 0;
+
+	for_each_online_pgdat(pgdat) {
+		PR_DEBUG("Node %d.\n", node_id);
+
+		if (try_alloc_dyn_pageflag_part(MAX_NR_ZONES,
+					(void **) &(*pagemap)[node_id]))
+				return -ENOMEM;
+
+		for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) {
+			PR_DEBUG("Zone %d of %d.\n", zone_idx, MAX_NR_ZONES);
+
+			zone = &pgdat->node_zones[zone_idx];
+
+			if (!populated_zone(zone)) {
+				PR_DEBUG("Node %d zone %d unpopulated - won't allocate.\n", node_id, zone_idx);
+				continue;
+			}
+
+			zone_pages = pages_for_zone(zone);
+
+			PR_DEBUG("Node %d zone %d (needs %d pages).\n", node_id, zone_idx, zone_pages);
+
+			if (try_alloc_dyn_pageflag_part(zone_pages,
+				(void **) &(*pagemap)[node_id][zone_idx]))
+				return -ENOMEM;
+
+			for (i = 0; i < zone_pages; i++) {
+				unsigned long address = get_zeroed_page(GFP_ATOMIC);
+				if (!address) {
+					PR_DEBUG("Error. Unable to allocate memory for "
+						"dynamic pageflags.");
+					free_dyn_pageflags(pagemap);
+					return -ENOMEM;
+				}
+				PR_DEBUG("Node %d zone %d. Page %d.\n", node_id, zone_idx, i);
+				(*pagemap)[node_id][zone_idx][i] =
+					(unsigned long *) address;
+			}
+		}
+		node_id++;
+	}
+
+	PR_DEBUG("Done.\n");
+	return 0;
+}
+
+#define GET_BIT_AND_UL(bitmap, page) \
+	struct zone *zone = page_zone(page); \
+	unsigned long zone_pfn = page_to_pfn(page) - zone->zone_start_pfn; \
+	int node = page_to_nid(page); \
+	int zone_num = zone_idx(zone); \
+	int pagenum = PAGENUMBER(zone_pfn); \
+	int page_offset = PAGEINDEX(zone_pfn); \
+	unsigned long *ul = ((*bitmap)[node][zone_num][pagenum]) + page_offset; \
+	int bit = PAGEBIT(zone_pfn);
+
+/*
+ * test_dynpageflag(dyn_pageflags_t *bitmap, struct page *page)
+ *
+ * Is the page flagged in the given bitmap?
+ *
+ */
+
+int test_dynpageflag(dyn_pageflags_t *bitmap, struct page *page)
+{
+	GET_BIT_AND_UL(bitmap, page);
+	return test_bit(bit, ul);
+}
+
+/*
+ * set_dynpageflag(dyn_pageflags_t *bitmap, struct page *page)
+ *
+ * Set the flag for the page in the given bitmap.
+ *
+ */
+
+void set_dynpageflag(dyn_pageflags_t *bitmap, struct page *page)
+{
+	GET_BIT_AND_UL(bitmap, page);
+	set_bit(bit, ul);
+}
+
+/*
+ * clear_dynpageflags(dyn_pageflags_t *bitmap, struct page *page)
+ *
+ * Clear the flag for the page in the given bitmap.
+ *
+ */
+
+void clear_dynpageflag(dyn_pageflags_t *bitmap, struct page *page)
+{
+	GET_BIT_AND_UL(bitmap, page);
+	clear_bit(bit, ul);
+}
+
+/*
+ * get_next_bit_on(dyn_pageflags_t bitmap, int counter)
+ *
+ * Given a pfn (possibly -1), find the next pfn in the bitmap that
+ * is set. If there are no more flags set, return -1.
+ *
+ */
+
+unsigned long get_next_bit_on(dyn_pageflags_t bitmap, unsigned long counter)
+{
+	struct page *page;
+	struct zone *zone;
+	unsigned long *ul = NULL;
+	unsigned long zone_offset;
+	int pagebit, zone_num, first = (counter == (max_pfn + 1)), node;
+
+	if (first)
+		counter = first_online_pgdat()->node_zones->zone_start_pfn;
+
+	page = pfn_to_page(counter);
+	zone = page_zone(page);
+	node = zone->zone_pgdat->node_id;
+	zone_num = zone_idx(zone);
+	zone_offset = counter - zone->zone_start_pfn;
+
+	if (first)
+		goto test;
+
+	do {
+		zone_offset++;
+	
+		if (zone_offset >= zone->spanned_pages) {
+			do {
+				zone = next_zone(zone);
+				if (!zone)
+					return max_pfn + 1;
+			} while(!zone->spanned_pages);
+			
+			zone_num = zone_idx(zone);
+			node = zone->zone_pgdat->node_id;
+			zone_offset = 0;
+		}
+test:
+		pagebit = PAGEBIT(zone_offset);
+
+		if (!pagebit || !ul)
+			ul = (bitmap[node][zone_num][PAGENUMBER(zone_offset)])
+				+ PAGEINDEX(zone_offset);
+
+		if (!(*ul & ~((1 << pagebit) - 1))) {
+			zone_offset += BITS_PER_LONG - pagebit - 1;
+			continue;
+		}
+
+	} while(!test_bit(pagebit, ul));
+
+	return zone->zone_start_pfn + zone_offset;
+}
+
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index b025864..2138c47 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -236,6 +236,29 @@ static char * number(char * buf, char * end, unsigned long long num, int base, i
 	return buf;
 }
 
+/*
+ * vsnprintf_used
+ *
+ * Functionality    : Print a string with parameters to a buffer of a 
+ *                    limited size. Unlike vsnprintf, we return the number
+ *                    of bytes actually put in the buffer, not the number
+ *                    that would have been put in if it was big enough.
+ */
+int snprintf_used(char *buffer, int buffer_size, const char *fmt, ...)
+{
+	int result;
+	va_list args;
+
+	if (!buffer_size)
+		return 0;
+
+	va_start(args, fmt);
+	result = vsnprintf(buffer, buffer_size, fmt, args);
+	va_end(args);
+
+	return result > buffer_size ? buffer_size : result;
+}
+
 /**
  * vsnprintf - Format a string and place it in a buffer
  * @buf: The buffer to place the result into
diff --git a/mm/vmscan.c b/mm/vmscan.c
index db023e2..54acc2c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -654,6 +654,28 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 	return nr_taken;
 }
 
+/* return_lru_pages puts a list of pages back on a zone's lru lists. */
+
+static void return_lru_pages(struct list_head *page_list, struct zone *zone,
+		struct pagevec *pvec)
+{
+	while (!list_empty(page_list)) {
+		struct page *page = lru_to_page(page_list);
+		VM_BUG_ON(PageLRU(page));
+		SetPageLRU(page);
+		list_del(&page->lru);
+		if (PageActive(page))
+			add_page_to_active_list(zone, page);
+		else
+			add_page_to_inactive_list(zone, page);
+		if (!pagevec_add(pvec, page)) {
+			spin_unlock_irq(&zone->lru_lock);
+			__pagevec_release(pvec);
+			spin_lock_irq(&zone->lru_lock);
+		}
+	}
+}
+
 /*
  * shrink_inactive_list() is a helper for shrink_zone().  It returns the number
  * of reclaimed pages
@@ -671,7 +693,6 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
 	lru_add_drain();
 	spin_lock_irq(&zone->lru_lock);
 	do {
-		struct page *page;
 		unsigned long nr_taken;
 		unsigned long nr_scan;
 		unsigned long nr_freed;
@@ -701,21 +722,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
 		/*
 		 * Put back any unfreeable pages.
 		 */
-		while (!list_empty(&page_list)) {
-			page = lru_to_page(&page_list);
-			VM_BUG_ON(PageLRU(page));
-			SetPageLRU(page);
-			list_del(&page->lru);
-			if (PageActive(page))
-				add_page_to_active_list(zone, page);
-			else
-				add_page_to_inactive_list(zone, page);
-			if (!pagevec_add(&pvec, page)) {
-				spin_unlock_irq(&zone->lru_lock);
-				__pagevec_release(&pvec);
-				spin_lock_irq(&zone->lru_lock);
-			}
-		}
+		return_lru_pages(&page_list, zone, &pvec);
   	} while (nr_scanned < max_scan);
 	spin_unlock(&zone->lru_lock);
 done:
@@ -1276,6 +1283,72 @@ out:
 	return nr_reclaimed;
 }
 
+struct lru_save {
+	struct zone 		*zone;
+	struct list_head	active_list;
+	struct list_head	inactive_list;
+	struct lru_save		*next;
+};
+
+struct lru_save *lru_save_list;
+
+void unlink_lru_lists(void)
+{
+	struct zone *zone;
+
+	for_each_zone(zone) {
+		struct lru_save *this;
+		unsigned long moved, scanned;
+
+		if (!zone->spanned_pages)
+			continue;
+
+		this = (struct lru_save *)
+			kzalloc(sizeof(struct lru_save), GFP_ATOMIC);
+
+		BUG_ON(!this);
+
+		this->next = lru_save_list;
+		lru_save_list = this;
+		
+		this->zone = zone;
+
+		spin_lock_irq(&zone->lru_lock);
+		INIT_LIST_HEAD(&this->active_list);
+		INIT_LIST_HEAD(&this->inactive_list);
+		moved = isolate_lru_pages(zone_page_state(zone, NR_ACTIVE),
+				&zone->active_list, &this->active_list,
+				&scanned);
+		__mod_zone_page_state(zone, NR_ACTIVE, -moved);
+		moved = isolate_lru_pages(zone_page_state(zone, NR_INACTIVE),
+				&zone->inactive_list, &this->inactive_list,
+				&scanned);
+		__mod_zone_page_state(zone, NR_INACTIVE, -moved);
+		spin_unlock_irq(&zone->lru_lock);
+	}
+}
+
+void relink_lru_lists(void)
+{
+	while(lru_save_list) {
+		struct lru_save *this = lru_save_list;
+		struct zone *zone = this->zone;
+		struct pagevec pvec;
+
+		pagevec_init(&pvec, 1);
+
+		lru_save_list = this->next;
+
+		spin_lock_irq(&zone->lru_lock);
+		return_lru_pages(&this->active_list, zone, &pvec);
+		return_lru_pages(&this->inactive_list, zone, &pvec);
+		spin_unlock_irq(&zone->lru_lock);
+		pagevec_release(&pvec);
+
+		kfree(this);
+	}
+}
+
 /*
  * The background pageout daemon, started as a kernel thread
  * from the init process. 
@@ -1323,8 +1396,6 @@ static int kswapd(void *p)
 	for ( ; ; ) {
 		unsigned long new_order;
 
-		try_to_freeze();
-
 		/* kswapd has been busy so delay watermark_timer */
 		mod_timer(&pgdat->watermark_timer, jiffies + WT_EXPIRY);
 		prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE);
@@ -1335,13 +1406,20 @@ static int kswapd(void *p)
 			 */
 			order = new_order;
 		} else {
 			set_user_nice(tsk, 0);
-			schedule();
+			if (!freezing(current))
+				schedule();
+
 			order = pgdat->kswapd_max_order;
 		}
 		finish_wait(&pgdat->kswapd_wait, &wait);
 
-		balance_pgdat(pgdat, order);
+		if (!try_to_freeze()) {
+			/* We can speed up thawing tasks if we don't call
+			 * balance_pgdat after returning from the refrigerator
+			 */
+			balance_pgdat(pgdat, order);
+		}
 	}
 	return 0;
 }
@@ -1355,6 +1433,9 @@ void wakeup_kswapd(struct zone *zone, int order)
 	if (!populated_zone(zone))
 		return;
 
+	if (freezer_is_on())
+		return;
+
 	pgdat = zone->zone_pgdat;
 	if (zone_watermark_ok(zone, order, zone->pages_low, 0, 0))
 		return;
@@ -1368,6 +1449,91 @@ void wakeup_kswapd(struct zone *zone, int order)
 }
 
 #ifdef CONFIG_PM
+void shrink_one_zone(struct zone *zone, int total_to_free)
+{
+	int prio;
+	unsigned long still_to_free = total_to_free;
+	struct scan_control sc = {
+		.gfp_mask = GFP_KERNEL,
+		.may_swap = 0,
+		.may_writepage = 1,
+		.mapped = vm_mapped,
+	};
+
+	if (!populated_zone(zone) || zone->all_unreclaimable)
+		return;
+
+	if (still_to_free <= 0)
+		return;
+
+	if (is_highmem(zone))
+		sc.gfp_mask |= __GFP_HIGHMEM;
+
+	for (prio = DEF_PRIORITY; prio >= 0; prio--) {
+		unsigned long to_free, just_freed, orig_size;
+		unsigned long old_nr_active;
+
+		to_free = min(zone_page_state(zone, NR_ACTIVE) +
+				zone_page_state(zone, NR_INACTIVE),
+				still_to_free);
+
+		if (to_free <= 0)
+			return;
+
+		sc.swap_cluster_max = to_free -
+			zone_page_state(zone, NR_INACTIVE);
+
+		do {
+			old_nr_active = zone_page_state(zone, NR_ACTIVE);
+			zone->nr_scan_active = sc.swap_cluster_max - 1;
+			shrink_active_list(sc.swap_cluster_max, zone, &sc,
+					prio);
+			zone->nr_scan_active = 0;
+
+			sc.swap_cluster_max = to_free - zone_page_state(zone,
+					NR_INACTIVE);
+
+		} while (sc.swap_cluster_max > 0 &&
+			 zone_page_state(zone, NR_ACTIVE) > old_nr_active);
+
+		to_free = min(zone_page_state(zone, NR_ACTIVE) +
+				zone_page_state(zone, NR_INACTIVE),
+				still_to_free);
+		
+		do {
+			orig_size = zone_page_state(zone, NR_ACTIVE) +
+				zone_page_state(zone, NR_INACTIVE);
+			zone->nr_scan_inactive = to_free;
+			sc.swap_cluster_max = to_free;
+			shrink_inactive_list(to_free, zone, &sc);
+			just_freed = (orig_size -
+				(zone_page_state(zone, NR_ACTIVE) +
+				 zone_page_state(zone, NR_INACTIVE)));
+			zone->nr_scan_inactive = 0;
+			still_to_free -= just_freed;
+			to_free -= just_freed;
+		} while (just_freed > 0 && still_to_free > 0);
+	};
+
+	while (still_to_free > 0) {
+		unsigned long nr_slab = global_page_state(NR_SLAB_RECLAIMABLE);
+		struct reclaim_state reclaim_state;
+
+		if (nr_slab > still_to_free)
+			nr_slab = still_to_free;
+
+		reclaim_state.reclaimed_slab = 0;
+		shrink_slab(nr_slab, sc.gfp_mask, nr_slab);
+		if (!reclaim_state.reclaimed_slab)
+			break;
+
+		still_to_free -= reclaim_state.reclaimed_slab;
+	}
+
+	return;
+}
+
+
 /*
  * Helper function for shrink_all_memory().  Tries to reclaim 'nr_pages' pages
  * from LRU lists system-wide, for given pass and priority, and returns the