Contents of /trunk/kernel26-alx/patches-2.6.17-r6/0152-2.6.17-squashfs3.0.patch
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Fri May 18 11:04:36 2007 UTC (17 years, 5 months ago) by niro
File size: 125752 byte(s)
Fri May 18 11:04:36 2007 UTC (17 years, 5 months ago) by niro
File size: 125752 byte(s)
-import
1 | diff --new-file -urp linux-2.6.15/fs/Kconfig linux-2.6.15-squashfs3.0/fs/Kconfig |
2 | --- linux-2.6.15/fs/Kconfig 2006-03-01 22:37:27.000000000 +0000 |
3 | +++ linux-2.6.15-squashfs3.0/fs/Kconfig 2006-03-07 21:12:37.000000000 +0000 |
4 | @@ -1151,6 +1151,71 @@ config CRAMFS |
5 | |
6 | If unsure, say N. |
7 | |
8 | +config SQUASHFS |
9 | + tristate "SquashFS 3.0 - Squashed file system support" |
10 | + select ZLIB_INFLATE |
11 | + help |
12 | + Saying Y here includes support for SquashFS 3.0 (a Compressed Read-Only File |
13 | + System). Squashfs is a highly compressed read-only filesystem for Linux. |
14 | + It uses zlib compression to compress both files, inodes and directories. |
15 | + Inodes in the system are very small and all blocks are packed to minimise |
16 | + data overhead. Block sizes greater than 4K are supported up to a maximum of 64K. |
17 | + SquashFS 3.0 supports 64 bit filesystems and files (larger than 4GB), full |
18 | + uid/gid information, hard links and timestamps. |
19 | + |
20 | + Squashfs is intended for general read-only filesystem use, for archival |
21 | + use (i.e. in cases where a .tar.gz file may be used), and in embedded |
22 | + systems where low overhead is needed. Further information and filesystem tools |
23 | + are available from http://squashfs.sourceforge.net. |
24 | + |
25 | + If you want to compile this as a module ( = code which can be |
26 | + inserted in and removed from the running kernel whenever you want), |
27 | + say M here and read <file:Documentation/modules.txt>. The module |
28 | + will be called squashfs. Note that the root file system (the one |
29 | + containing the directory /) cannot be compiled as a module. |
30 | + |
31 | + If unsure, say N. |
32 | + |
33 | +config SQUASHFS_EMBEDDED |
34 | + |
35 | + bool "Additional options for memory-constrained systems" |
36 | + depends on SQUASHFS |
37 | + default n |
38 | + help |
39 | + Saying Y here allows you to specify cache sizes and how Squashfs |
40 | + allocates memory. This is only intended for memory constrained |
41 | + systems. |
42 | + |
43 | + If unsure, say N. |
44 | + |
45 | +config SQUASHFS_FRAGMENT_CACHE_SIZE |
46 | + int "Number of fragments cached" if SQUASHFS_EMBEDDED |
47 | + depends on SQUASHFS |
48 | + default "3" |
49 | + help |
50 | + By default SquashFS caches the last 3 fragments read from |
51 | + the filesystem. Increasing this amount may mean SquashFS |
52 | + has to re-read fragments less often from disk, at the expense |
53 | + of extra system memory. Decreasing this amount will mean |
54 | + SquashFS uses less memory at the expense of extra reads from disk. |
55 | + |
56 | + Note there must be at least one cached fragment. Anything |
57 | + much more than three will probably not make much difference. |
58 | + |
59 | +config SQUASHFS_VMALLOC |
60 | + bool "Use Vmalloc rather than Kmalloc" if SQUASHFS_EMBEDDED |
61 | + depends on SQUASHFS |
62 | + default n |
63 | + help |
64 | + By default SquashFS uses kmalloc to obtain fragment cache memory. |
65 | + Kmalloc memory is the standard kernel allocator, but it can fail |
66 | + on memory constrained systems. Because of the way Vmalloc works, |
67 | + Vmalloc can succeed when kmalloc fails. Specifying this option |
68 | + will make SquashFS always use Vmalloc to allocate the |
69 | + fragment cache memory. |
70 | + |
71 | + If unsure, say N. |
72 | + |
73 | config VXFS_FS |
74 | tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)" |
75 | help |
76 | diff --new-file -urp linux-2.6.15/fs/Makefile linux-2.6.15-squashfs3.0/fs/Makefile |
77 | --- linux-2.6.15/fs/Makefile 2006-03-01 22:37:27.000000000 +0000 |
78 | +++ linux-2.6.15-squashfs3.0/fs/Makefile 2006-03-07 21:12:37.000000000 +0000 |
79 | @@ -55,6 +55,7 @@ obj-$(CONFIG_EXT3_FS) += ext3/ # Before |
80 | obj-$(CONFIG_JBD) += jbd/ |
81 | obj-$(CONFIG_EXT2_FS) += ext2/ |
82 | obj-$(CONFIG_CRAMFS) += cramfs/ |
83 | +obj-$(CONFIG_SQUASHFS) += squashfs/ |
84 | obj-$(CONFIG_RAMFS) += ramfs/ |
85 | obj-$(CONFIG_HUGETLBFS) += hugetlbfs/ |
86 | obj-$(CONFIG_CODA_FS) += coda/ |
87 | diff --new-file -urp linux-2.6.15/fs/squashfs/inode.c linux-2.6.15-squashfs3.0/fs/squashfs/inode.c |
88 | --- linux-2.6.15/fs/squashfs/inode.c 1970-01-01 01:00:00.000000000 +0100 |
89 | +++ linux-2.6.15-squashfs3.0/fs/squashfs/inode.c 2006-03-07 21:12:37.000000000 +0000 |
90 | @@ -0,0 +1,2127 @@ |
91 | +/* |
92 | + * Squashfs - a compressed read only filesystem for Linux |
93 | + * |
94 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006 |
95 | + * Phillip Lougher <phillip@lougher.org.uk> |
96 | + * |
97 | + * This program is free software; you can redistribute it and/or |
98 | + * modify it under the terms of the GNU General Public License |
99 | + * as published by the Free Software Foundation; either version 2, |
100 | + * or (at your option) any later version. |
101 | + * |
102 | + * This program is distributed in the hope that it will be useful, |
103 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
104 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
105 | + * GNU General Public License for more details. |
106 | + * |
107 | + * You should have received a copy of the GNU General Public License |
108 | + * along with this program; if not, write to the Free Software |
109 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
110 | + * |
111 | + * inode.c |
112 | + */ |
113 | + |
114 | +#include <linux/types.h> |
115 | +#include <linux/squashfs_fs.h> |
116 | +#include <linux/module.h> |
117 | +#include <linux/errno.h> |
118 | +#include <linux/slab.h> |
119 | +#include <linux/fs.h> |
120 | +#include <linux/smp_lock.h> |
121 | +#include <linux/slab.h> |
122 | +#include <linux/squashfs_fs_sb.h> |
123 | +#include <linux/squashfs_fs_i.h> |
124 | +#include <linux/buffer_head.h> |
125 | +#include <linux/vfs.h> |
126 | +#include <linux/init.h> |
127 | +#include <linux/dcache.h> |
128 | +#include <linux/wait.h> |
129 | +#include <linux/zlib.h> |
130 | +#include <linux/blkdev.h> |
131 | +#include <linux/vmalloc.h> |
132 | +#include <asm/uaccess.h> |
133 | +#include <asm/semaphore.h> |
134 | + |
135 | +#include "squashfs.h" |
136 | + |
137 | +static void squashfs_put_super(struct super_block *); |
138 | +static int squashfs_statfs(struct super_block *, struct kstatfs *); |
139 | +static int squashfs_symlink_readpage(struct file *file, struct page *page); |
140 | +static int squashfs_readpage(struct file *file, struct page *page); |
141 | +static int squashfs_readpage4K(struct file *file, struct page *page); |
142 | +static int squashfs_readdir(struct file *, void *, filldir_t); |
143 | +static struct inode *squashfs_alloc_inode(struct super_block *sb); |
144 | +static void squashfs_destroy_inode(struct inode *inode); |
145 | +static int init_inodecache(void); |
146 | +static void destroy_inodecache(void); |
147 | +static struct dentry *squashfs_lookup(struct inode *, struct dentry *, |
148 | + struct nameidata *); |
149 | +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode); |
150 | +static long long read_blocklist(struct inode *inode, int index, |
151 | + int readahead_blks, char *block_list, |
152 | + unsigned short **block_p, unsigned int *bsize); |
153 | +static struct super_block *squashfs_get_sb(struct file_system_type *, int, |
154 | + const char *, void *); |
155 | + |
156 | + |
157 | +static z_stream stream; |
158 | + |
159 | +static struct file_system_type squashfs_fs_type = { |
160 | + .owner = THIS_MODULE, |
161 | + .name = "squashfs", |
162 | + .get_sb = squashfs_get_sb, |
163 | + .kill_sb = kill_block_super, |
164 | + .fs_flags = FS_REQUIRES_DEV |
165 | +}; |
166 | + |
167 | +static unsigned char squashfs_filetype_table[] = { |
168 | + DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK |
169 | +}; |
170 | + |
171 | +static struct super_operations squashfs_ops = { |
172 | + .alloc_inode = squashfs_alloc_inode, |
173 | + .destroy_inode = squashfs_destroy_inode, |
174 | + .statfs = squashfs_statfs, |
175 | + .put_super = squashfs_put_super, |
176 | +}; |
177 | + |
178 | +SQSH_EXTERN struct address_space_operations squashfs_symlink_aops = { |
179 | + .readpage = squashfs_symlink_readpage |
180 | +}; |
181 | + |
182 | +SQSH_EXTERN struct address_space_operations squashfs_aops = { |
183 | + .readpage = squashfs_readpage |
184 | +}; |
185 | + |
186 | +SQSH_EXTERN struct address_space_operations squashfs_aops_4K = { |
187 | + .readpage = squashfs_readpage4K |
188 | +}; |
189 | + |
190 | +static struct file_operations squashfs_dir_ops = { |
191 | + .read = generic_read_dir, |
192 | + .readdir = squashfs_readdir |
193 | +}; |
194 | + |
195 | +SQSH_EXTERN struct inode_operations squashfs_dir_inode_ops = { |
196 | + .lookup = squashfs_lookup |
197 | +}; |
198 | + |
199 | + |
200 | +static struct buffer_head *get_block_length(struct super_block *s, |
201 | + int *cur_index, int *offset, int *c_byte) |
202 | +{ |
203 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
204 | + unsigned short temp; |
205 | + struct buffer_head *bh; |
206 | + |
207 | + if (!(bh = sb_bread(s, *cur_index))) |
208 | + goto out; |
209 | + |
210 | + if (msblk->devblksize - *offset == 1) { |
211 | + if (msblk->swap) |
212 | + ((unsigned char *) &temp)[1] = *((unsigned char *) |
213 | + (bh->b_data + *offset)); |
214 | + else |
215 | + ((unsigned char *) &temp)[0] = *((unsigned char *) |
216 | + (bh->b_data + *offset)); |
217 | + brelse(bh); |
218 | + if (!(bh = sb_bread(s, ++(*cur_index)))) |
219 | + goto out; |
220 | + if (msblk->swap) |
221 | + ((unsigned char *) &temp)[0] = *((unsigned char *) |
222 | + bh->b_data); |
223 | + else |
224 | + ((unsigned char *) &temp)[1] = *((unsigned char *) |
225 | + bh->b_data); |
226 | + *c_byte = temp; |
227 | + *offset = 1; |
228 | + } else { |
229 | + if (msblk->swap) { |
230 | + ((unsigned char *) &temp)[1] = *((unsigned char *) |
231 | + (bh->b_data + *offset)); |
232 | + ((unsigned char *) &temp)[0] = *((unsigned char *) |
233 | + (bh->b_data + *offset + 1)); |
234 | + } else { |
235 | + ((unsigned char *) &temp)[0] = *((unsigned char *) |
236 | + (bh->b_data + *offset)); |
237 | + ((unsigned char *) &temp)[1] = *((unsigned char *) |
238 | + (bh->b_data + *offset + 1)); |
239 | + } |
240 | + *c_byte = temp; |
241 | + *offset += 2; |
242 | + } |
243 | + |
244 | + if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) { |
245 | + if (*offset == msblk->devblksize) { |
246 | + brelse(bh); |
247 | + if (!(bh = sb_bread(s, ++(*cur_index)))) |
248 | + goto out; |
249 | + *offset = 0; |
250 | + } |
251 | + if (*((unsigned char *) (bh->b_data + *offset)) != |
252 | + SQUASHFS_MARKER_BYTE) { |
253 | + ERROR("Metadata block marker corrupt @ %x\n", |
254 | + *cur_index); |
255 | + brelse(bh); |
256 | + goto out; |
257 | + } |
258 | + (*offset)++; |
259 | + } |
260 | + return bh; |
261 | + |
262 | +out: |
263 | + return NULL; |
264 | +} |
265 | + |
266 | + |
267 | +SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer, |
268 | + long long index, unsigned int length, |
269 | + long long *next_index) |
270 | +{ |
271 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
272 | + struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >> |
273 | + msblk->devblksize_log2) + 2]; |
274 | + unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1); |
275 | + unsigned int cur_index = index >> msblk->devblksize_log2; |
276 | + int bytes, avail_bytes, b = 0, k; |
277 | + char *c_buffer; |
278 | + unsigned int compressed; |
279 | + unsigned int c_byte = length; |
280 | + |
281 | + if (c_byte) { |
282 | + bytes = msblk->devblksize - offset; |
283 | + compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte); |
284 | + c_buffer = compressed ? msblk->read_data : buffer; |
285 | + c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte); |
286 | + |
287 | + TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed |
288 | + ? "" : "un", (unsigned int) c_byte); |
289 | + |
290 | + if (!(bh[0] = sb_getblk(s, cur_index))) |
291 | + goto block_release; |
292 | + |
293 | + for (b = 1; bytes < c_byte; b++) { |
294 | + if (!(bh[b] = sb_getblk(s, ++cur_index))) |
295 | + goto block_release; |
296 | + bytes += msblk->devblksize; |
297 | + } |
298 | + ll_rw_block(READ, b, bh); |
299 | + } else { |
300 | + if (!(bh[0] = get_block_length(s, &cur_index, &offset, |
301 | + &c_byte))) |
302 | + goto read_failure; |
303 | + |
304 | + bytes = msblk->devblksize - offset; |
305 | + compressed = SQUASHFS_COMPRESSED(c_byte); |
306 | + c_buffer = compressed ? msblk->read_data : buffer; |
307 | + c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte); |
308 | + |
309 | + TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed |
310 | + ? "" : "un", (unsigned int) c_byte); |
311 | + |
312 | + for (b = 1; bytes < c_byte; b++) { |
313 | + if (!(bh[b] = sb_getblk(s, ++cur_index))) |
314 | + goto block_release; |
315 | + bytes += msblk->devblksize; |
316 | + } |
317 | + ll_rw_block(READ, b - 1, bh + 1); |
318 | + } |
319 | + |
320 | + if (compressed) |
321 | + down(&msblk->read_data_mutex); |
322 | + |
323 | + for (bytes = 0, k = 0; k < b; k++) { |
324 | + avail_bytes = (c_byte - bytes) > (msblk->devblksize - offset) ? |
325 | + msblk->devblksize - offset : |
326 | + c_byte - bytes; |
327 | + wait_on_buffer(bh[k]); |
328 | + if (!buffer_uptodate(bh[k])) |
329 | + goto block_release; |
330 | + memcpy(c_buffer + bytes, bh[k]->b_data + offset, avail_bytes); |
331 | + bytes += avail_bytes; |
332 | + offset = 0; |
333 | + brelse(bh[k]); |
334 | + } |
335 | + |
336 | + /* |
337 | + * uncompress block |
338 | + */ |
339 | + if (compressed) { |
340 | + int zlib_err; |
341 | + |
342 | + stream.next_in = c_buffer; |
343 | + stream.avail_in = c_byte; |
344 | + stream.next_out = buffer; |
345 | + stream.avail_out = msblk->read_size; |
346 | + |
347 | + if (((zlib_err = zlib_inflateInit(&stream)) != Z_OK) || |
348 | + ((zlib_err = zlib_inflate(&stream, Z_FINISH)) |
349 | + != Z_STREAM_END) || ((zlib_err = |
350 | + zlib_inflateEnd(&stream)) != Z_OK)) { |
351 | + ERROR("zlib_fs returned unexpected result 0x%x\n", |
352 | + zlib_err); |
353 | + bytes = 0; |
354 | + } else |
355 | + bytes = stream.total_out; |
356 | + |
357 | + up(&msblk->read_data_mutex); |
358 | + } |
359 | + |
360 | + if (next_index) |
361 | + *next_index = index + c_byte + (length ? 0 : |
362 | + (SQUASHFS_CHECK_DATA(msblk->sblk.flags) |
363 | + ? 3 : 2)); |
364 | + return bytes; |
365 | + |
366 | +block_release: |
367 | + while (--b >= 0) |
368 | + brelse(bh[b]); |
369 | + |
370 | +read_failure: |
371 | + ERROR("sb_bread failed reading block 0x%x\n", cur_index); |
372 | + return 0; |
373 | +} |
374 | + |
375 | + |
376 | +SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, char *buffer, |
377 | + long long block, unsigned int offset, |
378 | + int length, long long *next_block, |
379 | + unsigned int *next_offset) |
380 | +{ |
381 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
382 | + int n, i, bytes, return_length = length; |
383 | + long long next_index; |
384 | + |
385 | + TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset); |
386 | + |
387 | + while ( 1 ) { |
388 | + for (i = 0; i < SQUASHFS_CACHED_BLKS; i++) |
389 | + if (msblk->block_cache[i].block == block) |
390 | + break; |
391 | + |
392 | + down(&msblk->block_cache_mutex); |
393 | + |
394 | + if (i == SQUASHFS_CACHED_BLKS) { |
395 | + /* read inode header block */ |
396 | + for (i = msblk->next_cache, n = SQUASHFS_CACHED_BLKS; |
397 | + n ; n --, i = (i + 1) % |
398 | + SQUASHFS_CACHED_BLKS) |
399 | + if (msblk->block_cache[i].block != |
400 | + SQUASHFS_USED_BLK) |
401 | + break; |
402 | + |
403 | + if (n == 0) { |
404 | + wait_queue_t wait; |
405 | + |
406 | + init_waitqueue_entry(&wait, current); |
407 | + add_wait_queue(&msblk->waitq, &wait); |
408 | + set_current_state(TASK_UNINTERRUPTIBLE); |
409 | + up(&msblk->block_cache_mutex); |
410 | + schedule(); |
411 | + set_current_state(TASK_RUNNING); |
412 | + remove_wait_queue(&msblk->waitq, &wait); |
413 | + continue; |
414 | + } |
415 | + msblk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS; |
416 | + |
417 | + if (msblk->block_cache[i].block == |
418 | + SQUASHFS_INVALID_BLK) { |
419 | + if (!(msblk->block_cache[i].data = |
420 | + kmalloc(SQUASHFS_METADATA_SIZE, |
421 | + GFP_KERNEL))) { |
422 | + ERROR("Failed to allocate cache" |
423 | + "block\n"); |
424 | + up(&msblk->block_cache_mutex); |
425 | + goto out; |
426 | + } |
427 | + } |
428 | + |
429 | + msblk->block_cache[i].block = SQUASHFS_USED_BLK; |
430 | + up(&msblk->block_cache_mutex); |
431 | + |
432 | + if (!(msblk->block_cache[i].length = |
433 | + squashfs_read_data(s, |
434 | + msblk->block_cache[i].data, |
435 | + block, 0, &next_index))) { |
436 | + ERROR("Unable to read cache block [%llx:%x]\n", |
437 | + block, offset); |
438 | + goto out; |
439 | + } |
440 | + |
441 | + down(&msblk->block_cache_mutex); |
442 | + wake_up(&msblk->waitq); |
443 | + msblk->block_cache[i].block = block; |
444 | + msblk->block_cache[i].next_index = next_index; |
445 | + TRACE("Read cache block [%llx:%x]\n", block, offset); |
446 | + } |
447 | + |
448 | + if (msblk->block_cache[i].block != block) { |
449 | + up(&msblk->block_cache_mutex); |
450 | + continue; |
451 | + } |
452 | + |
453 | + if ((bytes = msblk->block_cache[i].length - offset) >= length) { |
454 | + if (buffer) |
455 | + memcpy(buffer, msblk->block_cache[i].data + |
456 | + offset, length); |
457 | + if (msblk->block_cache[i].length - offset == length) { |
458 | + *next_block = msblk->block_cache[i].next_index; |
459 | + *next_offset = 0; |
460 | + } else { |
461 | + *next_block = block; |
462 | + *next_offset = offset + length; |
463 | + } |
464 | + up(&msblk->block_cache_mutex); |
465 | + goto finish; |
466 | + } else { |
467 | + if (buffer) { |
468 | + memcpy(buffer, msblk->block_cache[i].data + |
469 | + offset, bytes); |
470 | + buffer += bytes; |
471 | + } |
472 | + block = msblk->block_cache[i].next_index; |
473 | + up(&msblk->block_cache_mutex); |
474 | + length -= bytes; |
475 | + offset = 0; |
476 | + } |
477 | + } |
478 | + |
479 | +finish: |
480 | + return return_length; |
481 | +out: |
482 | + return 0; |
483 | +} |
484 | + |
485 | + |
486 | +static int get_fragment_location(struct super_block *s, unsigned int fragment, |
487 | + long long *fragment_start_block, |
488 | + unsigned int *fragment_size) |
489 | +{ |
490 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
491 | + long long start_block = |
492 | + msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)]; |
493 | + int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment); |
494 | + struct squashfs_fragment_entry fragment_entry; |
495 | + |
496 | + if (msblk->swap) { |
497 | + struct squashfs_fragment_entry sfragment_entry; |
498 | + |
499 | + if (!squashfs_get_cached_block(s, (char *) &sfragment_entry, |
500 | + start_block, offset, |
501 | + sizeof(sfragment_entry), &start_block, |
502 | + &offset)) |
503 | + goto out; |
504 | + SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry); |
505 | + } else |
506 | + if (!squashfs_get_cached_block(s, (char *) &fragment_entry, |
507 | + start_block, offset, |
508 | + sizeof(fragment_entry), &start_block, |
509 | + &offset)) |
510 | + goto out; |
511 | + |
512 | + *fragment_start_block = fragment_entry.start_block; |
513 | + *fragment_size = fragment_entry.size; |
514 | + |
515 | + return 1; |
516 | + |
517 | +out: |
518 | + return 0; |
519 | +} |
520 | + |
521 | + |
522 | +SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, struct |
523 | + squashfs_fragment_cache *fragment) |
524 | +{ |
525 | + down(&msblk->fragment_mutex); |
526 | + fragment->locked --; |
527 | + wake_up(&msblk->fragment_wait_queue); |
528 | + up(&msblk->fragment_mutex); |
529 | +} |
530 | + |
531 | + |
532 | +SQSH_EXTERN struct squashfs_fragment_cache *get_cached_fragment(struct super_block |
533 | + *s, long long start_block, |
534 | + int length) |
535 | +{ |
536 | + int i, n; |
537 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
538 | + |
539 | + while ( 1 ) { |
540 | + down(&msblk->fragment_mutex); |
541 | + |
542 | + for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS && |
543 | + msblk->fragment[i].block != start_block; i++); |
544 | + |
545 | + if (i == SQUASHFS_CACHED_FRAGMENTS) { |
546 | + for (i = msblk->next_fragment, n = |
547 | + SQUASHFS_CACHED_FRAGMENTS; n && |
548 | + msblk->fragment[i].locked; n--, i = (i + 1) % |
549 | + SQUASHFS_CACHED_FRAGMENTS); |
550 | + |
551 | + if (n == 0) { |
552 | + wait_queue_t wait; |
553 | + |
554 | + init_waitqueue_entry(&wait, current); |
555 | + add_wait_queue(&msblk->fragment_wait_queue, |
556 | + &wait); |
557 | + set_current_state(TASK_UNINTERRUPTIBLE); |
558 | + up(&msblk->fragment_mutex); |
559 | + schedule(); |
560 | + set_current_state(TASK_RUNNING); |
561 | + remove_wait_queue(&msblk->fragment_wait_queue, |
562 | + &wait); |
563 | + continue; |
564 | + } |
565 | + msblk->next_fragment = (msblk->next_fragment + 1) % |
566 | + SQUASHFS_CACHED_FRAGMENTS; |
567 | + |
568 | + if (msblk->fragment[i].data == NULL) |
569 | + if (!(msblk->fragment[i].data = SQUASHFS_ALLOC |
570 | + (SQUASHFS_FILE_MAX_SIZE))) { |
571 | + ERROR("Failed to allocate fragment " |
572 | + "cache block\n"); |
573 | + up(&msblk->fragment_mutex); |
574 | + goto out; |
575 | + } |
576 | + |
577 | + msblk->fragment[i].block = SQUASHFS_INVALID_BLK; |
578 | + msblk->fragment[i].locked = 1; |
579 | + up(&msblk->fragment_mutex); |
580 | + |
581 | + if (!(msblk->fragment[i].length = squashfs_read_data(s, |
582 | + msblk->fragment[i].data, |
583 | + start_block, length, NULL))) { |
584 | + ERROR("Unable to read fragment cache block " |
585 | + "[%llx]\n", start_block); |
586 | + msblk->fragment[i].locked = 0; |
587 | + goto out; |
588 | + } |
589 | + |
590 | + msblk->fragment[i].block = start_block; |
591 | + TRACE("New fragment %d, start block %lld, locked %d\n", |
592 | + i, msblk->fragment[i].block, |
593 | + msblk->fragment[i].locked); |
594 | + break; |
595 | + } |
596 | + |
597 | + msblk->fragment[i].locked++; |
598 | + up(&msblk->fragment_mutex); |
599 | + TRACE("Got fragment %d, start block %lld, locked %d\n", i, |
600 | + msblk->fragment[i].block, |
601 | + msblk->fragment[i].locked); |
602 | + break; |
603 | + } |
604 | + |
605 | + return &msblk->fragment[i]; |
606 | + |
607 | +out: |
608 | + return NULL; |
609 | +} |
610 | + |
611 | + |
612 | +static struct inode *squashfs_new_inode(struct super_block *s, |
613 | + struct squashfs_base_inode_header *inodeb) |
614 | +{ |
615 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
616 | + struct inode *i = new_inode(s); |
617 | + |
618 | + if (i) { |
619 | + i->i_ino = inodeb->inode_number; |
620 | + i->i_mtime.tv_sec = inodeb->mtime; |
621 | + i->i_atime.tv_sec = inodeb->mtime; |
622 | + i->i_ctime.tv_sec = inodeb->mtime; |
623 | + i->i_uid = msblk->uid[inodeb->uid]; |
624 | + i->i_mode = inodeb->mode; |
625 | + i->i_size = 0; |
626 | + if (inodeb->guid == SQUASHFS_GUIDS) |
627 | + i->i_gid = i->i_uid; |
628 | + else |
629 | + i->i_gid = msblk->guid[inodeb->guid]; |
630 | + } |
631 | + |
632 | + return i; |
633 | +} |
634 | + |
635 | + |
636 | +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode) |
637 | +{ |
638 | + struct inode *i; |
639 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
640 | + struct squashfs_super_block *sblk = &msblk->sblk; |
641 | + long long block = SQUASHFS_INODE_BLK(inode) + |
642 | + sblk->inode_table_start; |
643 | + unsigned int offset = SQUASHFS_INODE_OFFSET(inode); |
644 | + long long next_block; |
645 | + unsigned int next_offset; |
646 | + union squashfs_inode_header id, sid; |
647 | + struct squashfs_base_inode_header *inodeb = &id.base, |
648 | + *sinodeb = &sid.base; |
649 | + |
650 | + TRACE("Entered squashfs_iget\n"); |
651 | + |
652 | + if (msblk->swap) { |
653 | + if (!squashfs_get_cached_block(s, (char *) sinodeb, block, |
654 | + offset, sizeof(*sinodeb), &next_block, |
655 | + &next_offset)) |
656 | + goto failed_read; |
657 | + SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb, |
658 | + sizeof(*sinodeb)); |
659 | + } else |
660 | + if (!squashfs_get_cached_block(s, (char *) inodeb, block, |
661 | + offset, sizeof(*inodeb), &next_block, |
662 | + &next_offset)) |
663 | + goto failed_read; |
664 | + |
665 | + switch(inodeb->inode_type) { |
666 | + case SQUASHFS_FILE_TYPE: { |
667 | + unsigned int frag_size; |
668 | + long long frag_blk; |
669 | + struct squashfs_reg_inode_header *inodep = &id.reg; |
670 | + struct squashfs_reg_inode_header *sinodep = &sid.reg; |
671 | + |
672 | + if (msblk->swap) { |
673 | + if (!squashfs_get_cached_block(s, (char *) |
674 | + sinodep, block, offset, |
675 | + sizeof(*sinodep), &next_block, |
676 | + &next_offset)) |
677 | + goto failed_read; |
678 | + SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep); |
679 | + } else |
680 | + if (!squashfs_get_cached_block(s, (char *) |
681 | + inodep, block, offset, |
682 | + sizeof(*inodep), &next_block, |
683 | + &next_offset)) |
684 | + goto failed_read; |
685 | + |
686 | + frag_blk = SQUASHFS_INVALID_BLK; |
687 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG && |
688 | + !get_fragment_location(s, |
689 | + inodep->fragment, &frag_blk, &frag_size)) |
690 | + goto failed_read; |
691 | + |
692 | + if((i = squashfs_new_inode(s, inodeb)) == NULL) |
693 | + goto failed_read1; |
694 | + |
695 | + i->i_nlink = 1; |
696 | + i->i_size = inodep->file_size; |
697 | + i->i_fop = &generic_ro_fops; |
698 | + i->i_mode |= S_IFREG; |
699 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; |
700 | + i->i_blksize = PAGE_CACHE_SIZE; |
701 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; |
702 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; |
703 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; |
704 | + SQUASHFS_I(i)->start_block = inodep->start_block; |
705 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; |
706 | + SQUASHFS_I(i)->offset = next_offset; |
707 | + if (sblk->block_size > 4096) |
708 | + i->i_data.a_ops = &squashfs_aops; |
709 | + else |
710 | + i->i_data.a_ops = &squashfs_aops_4K; |
711 | + |
712 | + TRACE("File inode %x:%x, start_block %llx, " |
713 | + "block_list_start %llx, offset %x\n", |
714 | + SQUASHFS_INODE_BLK(inode), offset, |
715 | + inodep->start_block, next_block, |
716 | + next_offset); |
717 | + break; |
718 | + } |
719 | + case SQUASHFS_LREG_TYPE: { |
720 | + unsigned int frag_size; |
721 | + long long frag_blk; |
722 | + struct squashfs_lreg_inode_header *inodep = &id.lreg; |
723 | + struct squashfs_lreg_inode_header *sinodep = &sid.lreg; |
724 | + |
725 | + if (msblk->swap) { |
726 | + if (!squashfs_get_cached_block(s, (char *) |
727 | + sinodep, block, offset, |
728 | + sizeof(*sinodep), &next_block, |
729 | + &next_offset)) |
730 | + goto failed_read; |
731 | + SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep); |
732 | + } else |
733 | + if (!squashfs_get_cached_block(s, (char *) |
734 | + inodep, block, offset, |
735 | + sizeof(*inodep), &next_block, |
736 | + &next_offset)) |
737 | + goto failed_read; |
738 | + |
739 | + frag_blk = SQUASHFS_INVALID_BLK; |
740 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG && |
741 | + !get_fragment_location(s, |
742 | + inodep->fragment, &frag_blk, &frag_size)) |
743 | + goto failed_read; |
744 | + |
745 | + if((i = squashfs_new_inode(s, inodeb)) == NULL) |
746 | + goto failed_read1; |
747 | + |
748 | + i->i_nlink = inodep->nlink; |
749 | + i->i_size = inodep->file_size; |
750 | + i->i_fop = &generic_ro_fops; |
751 | + i->i_mode |= S_IFREG; |
752 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; |
753 | + i->i_blksize = PAGE_CACHE_SIZE; |
754 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; |
755 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; |
756 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; |
757 | + SQUASHFS_I(i)->start_block = inodep->start_block; |
758 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; |
759 | + SQUASHFS_I(i)->offset = next_offset; |
760 | + if (sblk->block_size > 4096) |
761 | + i->i_data.a_ops = &squashfs_aops; |
762 | + else |
763 | + i->i_data.a_ops = &squashfs_aops_4K; |
764 | + |
765 | + TRACE("File inode %x:%x, start_block %llx, " |
766 | + "block_list_start %llx, offset %x\n", |
767 | + SQUASHFS_INODE_BLK(inode), offset, |
768 | + inodep->start_block, next_block, |
769 | + next_offset); |
770 | + break; |
771 | + } |
772 | + case SQUASHFS_DIR_TYPE: { |
773 | + struct squashfs_dir_inode_header *inodep = &id.dir; |
774 | + struct squashfs_dir_inode_header *sinodep = &sid.dir; |
775 | + |
776 | + if (msblk->swap) { |
777 | + if (!squashfs_get_cached_block(s, (char *) |
778 | + sinodep, block, offset, |
779 | + sizeof(*sinodep), &next_block, |
780 | + &next_offset)) |
781 | + goto failed_read; |
782 | + SQUASHFS_SWAP_DIR_INODE_HEADER(inodep, sinodep); |
783 | + } else |
784 | + if (!squashfs_get_cached_block(s, (char *) |
785 | + inodep, block, offset, |
786 | + sizeof(*inodep), &next_block, |
787 | + &next_offset)) |
788 | + goto failed_read; |
789 | + |
790 | + if((i = squashfs_new_inode(s, inodeb)) == NULL) |
791 | + goto failed_read1; |
792 | + |
793 | + i->i_nlink = inodep->nlink; |
794 | + i->i_size = inodep->file_size; |
795 | + i->i_op = &squashfs_dir_inode_ops; |
796 | + i->i_fop = &squashfs_dir_ops; |
797 | + i->i_mode |= S_IFDIR; |
798 | + SQUASHFS_I(i)->start_block = inodep->start_block; |
799 | + SQUASHFS_I(i)->offset = inodep->offset; |
800 | + SQUASHFS_I(i)->u.s2.directory_index_count = 0; |
801 | + SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode; |
802 | + |
803 | + TRACE("Directory inode %x:%x, start_block %x, offset " |
804 | + "%x\n", SQUASHFS_INODE_BLK(inode), |
805 | + offset, inodep->start_block, |
806 | + inodep->offset); |
807 | + break; |
808 | + } |
809 | + case SQUASHFS_LDIR_TYPE: { |
810 | + struct squashfs_ldir_inode_header *inodep = &id.ldir; |
811 | + struct squashfs_ldir_inode_header *sinodep = &sid.ldir; |
812 | + |
813 | + if (msblk->swap) { |
814 | + if (!squashfs_get_cached_block(s, (char *) |
815 | + sinodep, block, offset, |
816 | + sizeof(*sinodep), &next_block, |
817 | + &next_offset)) |
818 | + goto failed_read; |
819 | + SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep, |
820 | + sinodep); |
821 | + } else |
822 | + if (!squashfs_get_cached_block(s, (char *) |
823 | + inodep, block, offset, |
824 | + sizeof(*inodep), &next_block, |
825 | + &next_offset)) |
826 | + goto failed_read; |
827 | + |
828 | + if((i = squashfs_new_inode(s, inodeb)) == NULL) |
829 | + goto failed_read1; |
830 | + |
831 | + i->i_nlink = inodep->nlink; |
832 | + i->i_size = inodep->file_size; |
833 | + i->i_op = &squashfs_dir_inode_ops; |
834 | + i->i_fop = &squashfs_dir_ops; |
835 | + i->i_mode |= S_IFDIR; |
836 | + SQUASHFS_I(i)->start_block = inodep->start_block; |
837 | + SQUASHFS_I(i)->offset = inodep->offset; |
838 | + SQUASHFS_I(i)->u.s2.directory_index_start = next_block; |
839 | + SQUASHFS_I(i)->u.s2.directory_index_offset = |
840 | + next_offset; |
841 | + SQUASHFS_I(i)->u.s2.directory_index_count = |
842 | + inodep->i_count; |
843 | + SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode; |
844 | + |
845 | + TRACE("Long directory inode %x:%x, start_block %x, " |
846 | + "offset %x\n", |
847 | + SQUASHFS_INODE_BLK(inode), offset, |
848 | + inodep->start_block, inodep->offset); |
849 | + break; |
850 | + } |
851 | + case SQUASHFS_SYMLINK_TYPE: { |
852 | + struct squashfs_symlink_inode_header *inodep = |
853 | + &id.symlink; |
854 | + struct squashfs_symlink_inode_header *sinodep = |
855 | + &sid.symlink; |
856 | + |
857 | + if (msblk->swap) { |
858 | + if (!squashfs_get_cached_block(s, (char *) |
859 | + sinodep, block, offset, |
860 | + sizeof(*sinodep), &next_block, |
861 | + &next_offset)) |
862 | + goto failed_read; |
863 | + SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep, |
864 | + sinodep); |
865 | + } else |
866 | + if (!squashfs_get_cached_block(s, (char *) |
867 | + inodep, block, offset, |
868 | + sizeof(*inodep), &next_block, |
869 | + &next_offset)) |
870 | + goto failed_read; |
871 | + |
872 | + if((i = squashfs_new_inode(s, inodeb)) == NULL) |
873 | + goto failed_read1; |
874 | + |
875 | + i->i_nlink = inodep->nlink; |
876 | + i->i_size = inodep->symlink_size; |
877 | + i->i_op = &page_symlink_inode_operations; |
878 | + i->i_data.a_ops = &squashfs_symlink_aops; |
879 | + i->i_mode |= S_IFLNK; |
880 | + SQUASHFS_I(i)->start_block = next_block; |
881 | + SQUASHFS_I(i)->offset = next_offset; |
882 | + |
883 | + TRACE("Symbolic link inode %x:%x, start_block %llx, " |
884 | + "offset %x\n", |
885 | + SQUASHFS_INODE_BLK(inode), offset, |
886 | + next_block, next_offset); |
887 | + break; |
888 | + } |
889 | + case SQUASHFS_BLKDEV_TYPE: |
890 | + case SQUASHFS_CHRDEV_TYPE: { |
891 | + struct squashfs_dev_inode_header *inodep = &id.dev; |
892 | + struct squashfs_dev_inode_header *sinodep = &sid.dev; |
893 | + |
894 | + if (msblk->swap) { |
895 | + if (!squashfs_get_cached_block(s, (char *) |
896 | + sinodep, block, offset, |
897 | + sizeof(*sinodep), &next_block, |
898 | + &next_offset)) |
899 | + goto failed_read; |
900 | + SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, sinodep); |
901 | + } else |
902 | + if (!squashfs_get_cached_block(s, (char *) |
903 | + inodep, block, offset, |
904 | + sizeof(*inodep), &next_block, |
905 | + &next_offset)) |
906 | + goto failed_read; |
907 | + |
908 | + if ((i = squashfs_new_inode(s, inodeb)) == NULL) |
909 | + goto failed_read1; |
910 | + |
911 | + i->i_nlink = inodep->nlink; |
912 | + i->i_mode |= (inodeb->inode_type == |
913 | + SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : |
914 | + S_IFBLK; |
915 | + init_special_inode(i, i->i_mode, |
916 | + old_decode_dev(inodep->rdev)); |
917 | + |
918 | + TRACE("Device inode %x:%x, rdev %x\n", |
919 | + SQUASHFS_INODE_BLK(inode), offset, |
920 | + inodep->rdev); |
921 | + break; |
922 | + } |
923 | + case SQUASHFS_FIFO_TYPE: |
924 | + case SQUASHFS_SOCKET_TYPE: { |
925 | + struct squashfs_ipc_inode_header *inodep = &id.ipc; |
926 | + struct squashfs_ipc_inode_header *sinodep = &sid.ipc; |
927 | + |
928 | + if (msblk->swap) { |
929 | + if (!squashfs_get_cached_block(s, (char *) |
930 | + sinodep, block, offset, |
931 | + sizeof(*sinodep), &next_block, |
932 | + &next_offset)) |
933 | + goto failed_read; |
934 | + SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep); |
935 | + } else |
936 | + if (!squashfs_get_cached_block(s, (char *) |
937 | + inodep, block, offset, |
938 | + sizeof(*inodep), &next_block, |
939 | + &next_offset)) |
940 | + goto failed_read; |
941 | + |
942 | + if ((i = squashfs_new_inode(s, inodeb)) == NULL) |
943 | + goto failed_read1; |
944 | + |
945 | + i->i_nlink = inodep->nlink; |
946 | + i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE) |
947 | + ? S_IFIFO : S_IFSOCK; |
948 | + init_special_inode(i, i->i_mode, 0); |
949 | + break; |
950 | + } |
951 | + default: |
952 | + ERROR("Unknown inode type %d in squashfs_iget!\n", |
953 | + inodeb->inode_type); |
954 | + goto failed_read1; |
955 | + } |
956 | + |
957 | + insert_inode_hash(i); |
958 | + return i; |
959 | + |
960 | +failed_read: |
961 | + ERROR("Unable to read inode [%llx:%x]\n", block, offset); |
962 | + |
963 | +failed_read1: |
964 | + return NULL; |
965 | +} |
966 | + |
967 | + |
968 | +static int read_fragment_index_table(struct super_block *s) |
969 | +{ |
970 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
971 | + struct squashfs_super_block *sblk = &msblk->sblk; |
972 | + |
973 | + /* Allocate fragment index table */ |
974 | + if (!(msblk->fragment_index = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES |
975 | + (sblk->fragments), GFP_KERNEL))) { |
976 | + ERROR("Failed to allocate uid/gid table\n"); |
977 | + return 0; |
978 | + } |
979 | + |
980 | + if (SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments) && |
981 | + !squashfs_read_data(s, (char *) |
982 | + msblk->fragment_index, |
983 | + sblk->fragment_table_start, |
984 | + SQUASHFS_FRAGMENT_INDEX_BYTES |
985 | + (sblk->fragments) | |
986 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) { |
987 | + ERROR("unable to read fragment index table\n"); |
988 | + return 0; |
989 | + } |
990 | + |
991 | + if (msblk->swap) { |
992 | + int i; |
993 | + long long fragment; |
994 | + |
995 | + for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments); |
996 | + i++) { |
997 | + SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment), |
998 | + &msblk->fragment_index[i], 1); |
999 | + msblk->fragment_index[i] = fragment; |
1000 | + } |
1001 | + } |
1002 | + |
1003 | + return 1; |
1004 | +} |
1005 | + |
1006 | + |
1007 | +static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent) |
1008 | +{ |
1009 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1010 | + |
1011 | + msblk->iget = squashfs_iget; |
1012 | + msblk->read_blocklist = read_blocklist; |
1013 | + msblk->read_fragment_index_table = read_fragment_index_table; |
1014 | + |
1015 | + if (sblk->s_major == 1) { |
1016 | + if (!squashfs_1_0_supported(msblk)) { |
1017 | + SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems " |
1018 | + "are unsupported\n"); |
1019 | + SERROR("Please recompile with " |
1020 | + "Squashfs 1.0 support enabled\n"); |
1021 | + return 0; |
1022 | + } |
1023 | + } else if (sblk->s_major == 2) { |
1024 | + if (!squashfs_2_0_supported(msblk)) { |
1025 | + SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems " |
1026 | + "are unsupported\n"); |
1027 | + SERROR("Please recompile with " |
1028 | + "Squashfs 2.0 support enabled\n"); |
1029 | + return 0; |
1030 | + } |
1031 | + } else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor > |
1032 | + SQUASHFS_MINOR) { |
1033 | + SERROR("Major/Minor mismatch, trying to mount newer %d.%d " |
1034 | + "filesystem\n", sblk->s_major, sblk->s_minor); |
1035 | + SERROR("Please update your kernel\n"); |
1036 | + return 0; |
1037 | + } |
1038 | + |
1039 | + return 1; |
1040 | +} |
1041 | + |
1042 | + |
1043 | +static int squashfs_fill_super(struct super_block *s, void *data, int silent) |
1044 | +{ |
1045 | + struct squashfs_sb_info *msblk; |
1046 | + struct squashfs_super_block *sblk; |
1047 | + int i; |
1048 | + char b[BDEVNAME_SIZE]; |
1049 | + struct inode *root; |
1050 | + |
1051 | + TRACE("Entered squashfs_read_superblock\n"); |
1052 | + |
1053 | + if (!(s->s_fs_info = kmalloc(sizeof(struct squashfs_sb_info), |
1054 | + GFP_KERNEL))) { |
1055 | + ERROR("Failed to allocate superblock\n"); |
1056 | + goto failure; |
1057 | + } |
1058 | + memset(s->s_fs_info, 0, sizeof(struct squashfs_sb_info)); |
1059 | + msblk = s->s_fs_info; |
1060 | + sblk = &msblk->sblk; |
1061 | + |
1062 | + msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE); |
1063 | + msblk->devblksize_log2 = ffz(~msblk->devblksize); |
1064 | + |
1065 | + init_MUTEX(&msblk->read_data_mutex); |
1066 | + init_MUTEX(&msblk->read_page_mutex); |
1067 | + init_MUTEX(&msblk->block_cache_mutex); |
1068 | + init_MUTEX(&msblk->fragment_mutex); |
1069 | + init_MUTEX(&msblk->meta_index_mutex); |
1070 | + |
1071 | + init_waitqueue_head(&msblk->waitq); |
1072 | + init_waitqueue_head(&msblk->fragment_wait_queue); |
1073 | + |
1074 | + if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START, |
1075 | + sizeof(struct squashfs_super_block) | |
1076 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) { |
1077 | + SERROR("unable to read superblock\n"); |
1078 | + goto failed_mount; |
1079 | + } |
1080 | + |
1081 | + /* Check it is a SQUASHFS superblock */ |
1082 | + msblk->swap = 0; |
1083 | + if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) { |
1084 | + if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) { |
1085 | + struct squashfs_super_block ssblk; |
1086 | + |
1087 | + WARNING("Mounting a different endian SQUASHFS " |
1088 | + "filesystem on %s\n", bdevname(s->s_bdev, b)); |
1089 | + |
1090 | + SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk); |
1091 | + memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block)); |
1092 | + msblk->swap = 1; |
1093 | + } else { |
1094 | + SERROR("Can't find a SQUASHFS superblock on %s\n", |
1095 | + bdevname(s->s_bdev, b)); |
1096 | + goto failed_mount; |
1097 | + } |
1098 | + } |
1099 | + |
1100 | + /* Check the MAJOR & MINOR versions */ |
1101 | + if(!supported_squashfs_filesystem(msblk, silent)) |
1102 | + goto failed_mount; |
1103 | + |
1104 | + TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b)); |
1105 | + TRACE("Inodes are %scompressed\n", |
1106 | + SQUASHFS_UNCOMPRESSED_INODES |
1107 | + (sblk->flags) ? "un" : ""); |
1108 | + TRACE("Data is %scompressed\n", |
1109 | + SQUASHFS_UNCOMPRESSED_DATA(sblk->flags) |
1110 | + ? "un" : ""); |
1111 | + TRACE("Check data is %s present in the filesystem\n", |
1112 | + SQUASHFS_CHECK_DATA(sblk->flags) ? |
1113 | + "" : "not"); |
1114 | + TRACE("Filesystem size %lld bytes\n", sblk->bytes_used); |
1115 | + TRACE("Block size %d\n", sblk->block_size); |
1116 | + TRACE("Number of inodes %d\n", sblk->inodes); |
1117 | + if (sblk->s_major > 1) |
1118 | + TRACE("Number of fragments %d\n", sblk->fragments); |
1119 | + TRACE("Number of uids %d\n", sblk->no_uids); |
1120 | + TRACE("Number of gids %d\n", sblk->no_guids); |
1121 | + TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start); |
1122 | + TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start); |
1123 | + if (sblk->s_major > 1) |
1124 | + TRACE("sblk->fragment_table_start %llx\n", |
1125 | + sblk->fragment_table_start); |
1126 | + TRACE("sblk->uid_start %llx\n", sblk->uid_start); |
1127 | + |
1128 | + s->s_flags |= MS_RDONLY; |
1129 | + s->s_op = &squashfs_ops; |
1130 | + |
1131 | + /* Init inode_table block pointer array */ |
1132 | + if (!(msblk->block_cache = kmalloc(sizeof(struct squashfs_cache) * |
1133 | + SQUASHFS_CACHED_BLKS, GFP_KERNEL))) { |
1134 | + ERROR("Failed to allocate block cache\n"); |
1135 | + goto failed_mount; |
1136 | + } |
1137 | + |
1138 | + for (i = 0; i < SQUASHFS_CACHED_BLKS; i++) |
1139 | + msblk->block_cache[i].block = SQUASHFS_INVALID_BLK; |
1140 | + |
1141 | + msblk->next_cache = 0; |
1142 | + |
1143 | + /* Allocate read_data block */ |
1144 | + msblk->read_size = (sblk->block_size < SQUASHFS_METADATA_SIZE) ? |
1145 | + SQUASHFS_METADATA_SIZE : |
1146 | + sblk->block_size; |
1147 | + |
1148 | + if (!(msblk->read_data = kmalloc(msblk->read_size, GFP_KERNEL))) { |
1149 | + ERROR("Failed to allocate read_data block\n"); |
1150 | + goto failed_mount; |
1151 | + } |
1152 | + |
1153 | + /* Allocate read_page block */ |
1154 | + if (!(msblk->read_page = kmalloc(sblk->block_size, GFP_KERNEL))) { |
1155 | + ERROR("Failed to allocate read_page block\n"); |
1156 | + goto failed_mount; |
1157 | + } |
1158 | + |
1159 | + /* Allocate uid and gid tables */ |
1160 | + if (!(msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) * |
1161 | + sizeof(unsigned int), GFP_KERNEL))) { |
1162 | + ERROR("Failed to allocate uid/gid table\n"); |
1163 | + goto failed_mount; |
1164 | + } |
1165 | + msblk->guid = msblk->uid + sblk->no_uids; |
1166 | + |
1167 | + if (msblk->swap) { |
1168 | + unsigned int suid[sblk->no_uids + sblk->no_guids]; |
1169 | + |
1170 | + if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start, |
1171 | + ((sblk->no_uids + sblk->no_guids) * |
1172 | + sizeof(unsigned int)) | |
1173 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) { |
1174 | + ERROR("unable to read uid/gid table\n"); |
1175 | + goto failed_mount; |
1176 | + } |
1177 | + |
1178 | + SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids + |
1179 | + sblk->no_guids), (sizeof(unsigned int) * 8)); |
1180 | + } else |
1181 | + if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start, |
1182 | + ((sblk->no_uids + sblk->no_guids) * |
1183 | + sizeof(unsigned int)) | |
1184 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) { |
1185 | + ERROR("unable to read uid/gid table\n"); |
1186 | + goto failed_mount; |
1187 | + } |
1188 | + |
1189 | + |
1190 | + if (sblk->s_major == 1 && squashfs_1_0_supported(msblk)) |
1191 | + goto allocate_root; |
1192 | + |
1193 | + if (!(msblk->fragment = kmalloc(sizeof(struct squashfs_fragment_cache) * |
1194 | + SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) { |
1195 | + ERROR("Failed to allocate fragment block cache\n"); |
1196 | + goto failed_mount; |
1197 | + } |
1198 | + |
1199 | + for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) { |
1200 | + msblk->fragment[i].locked = 0; |
1201 | + msblk->fragment[i].block = SQUASHFS_INVALID_BLK; |
1202 | + msblk->fragment[i].data = NULL; |
1203 | + } |
1204 | + |
1205 | + msblk->next_fragment = 0; |
1206 | + |
1207 | + /* Allocate fragment index table */ |
1208 | + if (msblk->read_fragment_index_table(s) == 0) |
1209 | + goto failed_mount; |
1210 | + |
1211 | +allocate_root: |
1212 | + if ((root = (msblk->iget)(s, sblk->root_inode)) == NULL) |
1213 | + goto failed_mount; |
1214 | + |
1215 | + if ((s->s_root = d_alloc_root(root)) == NULL) { |
1216 | + ERROR("Root inode create failed\n"); |
1217 | + iput(root); |
1218 | + goto failed_mount; |
1219 | + } |
1220 | + |
1221 | + TRACE("Leaving squashfs_read_super\n"); |
1222 | + return 0; |
1223 | + |
1224 | +failed_mount: |
1225 | + kfree(msblk->fragment_index); |
1226 | + kfree(msblk->fragment); |
1227 | + kfree(msblk->uid); |
1228 | + kfree(msblk->read_page); |
1229 | + kfree(msblk->read_data); |
1230 | + kfree(msblk->block_cache); |
1231 | + kfree(msblk->fragment_index_2); |
1232 | + kfree(s->s_fs_info); |
1233 | + s->s_fs_info = NULL; |
1234 | + return -EINVAL; |
1235 | + |
1236 | +failure: |
1237 | + return -ENOMEM; |
1238 | +} |
1239 | + |
1240 | + |
1241 | +static int squashfs_statfs(struct super_block *s, struct kstatfs *buf) |
1242 | +{ |
1243 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
1244 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1245 | + |
1246 | + TRACE("Entered squashfs_statfs\n"); |
1247 | + |
1248 | + buf->f_type = SQUASHFS_MAGIC; |
1249 | + buf->f_bsize = sblk->block_size; |
1250 | + buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1; |
1251 | + buf->f_bfree = buf->f_bavail = 0; |
1252 | + buf->f_files = sblk->inodes; |
1253 | + buf->f_ffree = 0; |
1254 | + buf->f_namelen = SQUASHFS_NAME_LEN; |
1255 | + |
1256 | + return 0; |
1257 | +} |
1258 | + |
1259 | + |
1260 | +static int squashfs_symlink_readpage(struct file *file, struct page *page) |
1261 | +{ |
1262 | + struct inode *inode = page->mapping->host; |
1263 | + int index = page->index << PAGE_CACHE_SHIFT, length, bytes; |
1264 | + long long block = SQUASHFS_I(inode)->start_block; |
1265 | + int offset = SQUASHFS_I(inode)->offset; |
1266 | + void *pageaddr = kmap(page); |
1267 | + |
1268 | + TRACE("Entered squashfs_symlink_readpage, page index %ld, start block " |
1269 | + "%llx, offset %x\n", page->index, |
1270 | + SQUASHFS_I(inode)->start_block, |
1271 | + SQUASHFS_I(inode)->offset); |
1272 | + |
1273 | + for (length = 0; length < index; length += bytes) { |
1274 | + if (!(bytes = squashfs_get_cached_block(inode->i_sb, NULL, |
1275 | + block, offset, PAGE_CACHE_SIZE, &block, |
1276 | + &offset))) { |
1277 | + ERROR("Unable to read symbolic link [%llx:%x]\n", block, |
1278 | + offset); |
1279 | + goto skip_read; |
1280 | + } |
1281 | + } |
1282 | + |
1283 | + if (length != index) { |
1284 | + ERROR("(squashfs_symlink_readpage) length != index\n"); |
1285 | + bytes = 0; |
1286 | + goto skip_read; |
1287 | + } |
1288 | + |
1289 | + bytes = (i_size_read(inode) - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE : |
1290 | + i_size_read(inode) - length; |
1291 | + |
1292 | + if (!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block, |
1293 | + offset, bytes, &block, &offset))) |
1294 | + ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset); |
1295 | + |
1296 | +skip_read: |
1297 | + memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes); |
1298 | + kunmap(page); |
1299 | + SetPageUptodate(page); |
1300 | + unlock_page(page); |
1301 | + |
1302 | + return 0; |
1303 | +} |
1304 | + |
1305 | + |
1306 | +struct meta_index *locate_meta_index(struct inode *inode, int index, int offset) |
1307 | +{ |
1308 | + struct meta_index *meta = NULL; |
1309 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; |
1310 | + int i; |
1311 | + |
1312 | + down(&msblk->meta_index_mutex); |
1313 | + |
1314 | + TRACE("locate_meta_index: index %d, offset %d\n", index, offset); |
1315 | + |
1316 | + if(msblk->meta_index == NULL) |
1317 | + goto not_allocated; |
1318 | + |
1319 | + for (i = 0; i < SQUASHFS_META_NUMBER; i ++) |
1320 | + if (msblk->meta_index[i].inode_number == inode->i_ino && |
1321 | + msblk->meta_index[i].offset >= offset && |
1322 | + msblk->meta_index[i].offset <= index && |
1323 | + msblk->meta_index[i].locked == 0) { |
1324 | + TRACE("locate_meta_index: entry %d, offset %d\n", i, |
1325 | + msblk->meta_index[i].offset); |
1326 | + meta = &msblk->meta_index[i]; |
1327 | + offset = meta->offset; |
1328 | + } |
1329 | + |
1330 | + if (meta) |
1331 | + meta->locked = 1; |
1332 | + |
1333 | +not_allocated: |
1334 | + up(&msblk->meta_index_mutex); |
1335 | + |
1336 | + return meta; |
1337 | +} |
1338 | + |
1339 | + |
1340 | +struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip) |
1341 | +{ |
1342 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; |
1343 | + struct meta_index *meta = NULL; |
1344 | + int i; |
1345 | + |
1346 | + down(&msblk->meta_index_mutex); |
1347 | + |
1348 | + TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip); |
1349 | + |
1350 | + if(msblk->meta_index == NULL) { |
1351 | + if (!(msblk->meta_index = kmalloc(sizeof(struct meta_index) * |
1352 | + SQUASHFS_META_NUMBER, GFP_KERNEL))) { |
1353 | + ERROR("Failed to allocate meta_index\n"); |
1354 | + goto failed; |
1355 | + } |
1356 | + for(i = 0; i < SQUASHFS_META_NUMBER; i++) { |
1357 | + msblk->meta_index[i].inode_number = 0; |
1358 | + msblk->meta_index[i].locked = 0; |
1359 | + } |
1360 | + msblk->next_meta_index = 0; |
1361 | + } |
1362 | + |
1363 | + for(i = SQUASHFS_META_NUMBER; i && |
1364 | + msblk->meta_index[msblk->next_meta_index].locked; i --) |
1365 | + msblk->next_meta_index = (msblk->next_meta_index + 1) % |
1366 | + SQUASHFS_META_NUMBER; |
1367 | + |
1368 | + if(i == 0) { |
1369 | + TRACE("empty_meta_index: failed!\n"); |
1370 | + goto failed; |
1371 | + } |
1372 | + |
1373 | + TRACE("empty_meta_index: returned meta entry %d, %p\n", |
1374 | + msblk->next_meta_index, |
1375 | + &msblk->meta_index[msblk->next_meta_index]); |
1376 | + |
1377 | + meta = &msblk->meta_index[msblk->next_meta_index]; |
1378 | + msblk->next_meta_index = (msblk->next_meta_index + 1) % |
1379 | + SQUASHFS_META_NUMBER; |
1380 | + |
1381 | + meta->inode_number = inode->i_ino; |
1382 | + meta->offset = offset; |
1383 | + meta->skip = skip; |
1384 | + meta->entries = 0; |
1385 | + meta->locked = 1; |
1386 | + |
1387 | +failed: |
1388 | + up(&msblk->meta_index_mutex); |
1389 | + return meta; |
1390 | +} |
1391 | + |
1392 | + |
1393 | +void release_meta_index(struct inode *inode, struct meta_index *meta) |
1394 | +{ |
1395 | + meta->locked = 0; |
1396 | +} |
1397 | + |
1398 | + |
1399 | +static int read_block_index(struct super_block *s, int blocks, char *block_list, |
1400 | + long long *start_block, int *offset) |
1401 | +{ |
1402 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
1403 | + unsigned int *block_listp; |
1404 | + int block = 0; |
1405 | + |
1406 | + if (msblk->swap) { |
1407 | + char sblock_list[blocks << 2]; |
1408 | + |
1409 | + if (!squashfs_get_cached_block(s, sblock_list, *start_block, |
1410 | + *offset, blocks << 2, start_block, offset)) { |
1411 | + ERROR("Unable to read block list [%llx:%x]\n", |
1412 | + *start_block, *offset); |
1413 | + goto failure; |
1414 | + } |
1415 | + SQUASHFS_SWAP_INTS(((unsigned int *)block_list), |
1416 | + ((unsigned int *)sblock_list), blocks); |
1417 | + } else |
1418 | + if (!squashfs_get_cached_block(s, block_list, *start_block, |
1419 | + *offset, blocks << 2, start_block, offset)) { |
1420 | + ERROR("Unable to read block list [%llx:%x]\n", |
1421 | + *start_block, *offset); |
1422 | + goto failure; |
1423 | + } |
1424 | + |
1425 | + for (block_listp = (unsigned int *) block_list; blocks; |
1426 | + block_listp++, blocks --) |
1427 | + block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp); |
1428 | + |
1429 | + return block; |
1430 | + |
1431 | +failure: |
1432 | + return -1; |
1433 | +} |
1434 | + |
1435 | + |
1436 | +#define SIZE 256 |
1437 | + |
1438 | +static inline int calculate_skip(int blocks) { |
1439 | + int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES); |
1440 | + return skip >= 7 ? 7 : skip + 1; |
1441 | +} |
1442 | + |
1443 | + |
1444 | +static int get_meta_index(struct inode *inode, int index, |
1445 | + long long *index_block, int *index_offset, |
1446 | + long long *data_block, char *block_list) |
1447 | +{ |
1448 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; |
1449 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1450 | + int skip = calculate_skip(i_size_read(inode) >> sblk->block_log); |
1451 | + int offset = 0; |
1452 | + struct meta_index *meta; |
1453 | + struct meta_entry *meta_entry; |
1454 | + long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start; |
1455 | + int cur_offset = SQUASHFS_I(inode)->offset; |
1456 | + long long cur_data_block = SQUASHFS_I(inode)->start_block; |
1457 | + int i; |
1458 | + |
1459 | + index /= SQUASHFS_META_INDEXES * skip; |
1460 | + |
1461 | + while ( offset < index ) { |
1462 | + meta = locate_meta_index(inode, index, offset + 1); |
1463 | + |
1464 | + if (meta == NULL) { |
1465 | + if ((meta = empty_meta_index(inode, offset + 1, |
1466 | + skip)) == NULL) |
1467 | + goto all_done; |
1468 | + } else { |
1469 | + offset = index < meta->offset + meta->entries ? index : |
1470 | + meta->offset + meta->entries - 1; |
1471 | + meta_entry = &meta->meta_entry[offset - meta->offset]; |
1472 | + cur_index_block = meta_entry->index_block + sblk->inode_table_start; |
1473 | + cur_offset = meta_entry->offset; |
1474 | + cur_data_block = meta_entry->data_block; |
1475 | + TRACE("get_meta_index: offset %d, meta->offset %d, " |
1476 | + "meta->entries %d\n", offset, meta->offset, |
1477 | + meta->entries); |
1478 | + TRACE("get_meta_index: index_block 0x%llx, offset 0x%x" |
1479 | + " data_block 0x%llx\n", cur_index_block, |
1480 | + cur_offset, cur_data_block); |
1481 | + } |
1482 | + |
1483 | + for (i = meta->offset + meta->entries; i <= index && |
1484 | + i < meta->offset + SQUASHFS_META_ENTRIES; i++) { |
1485 | + int blocks = skip * SQUASHFS_META_INDEXES; |
1486 | + |
1487 | + while (blocks) { |
1488 | + int block = blocks > (SIZE >> 2) ? (SIZE >> 2) : |
1489 | + blocks; |
1490 | + int res = read_block_index(inode->i_sb, block, |
1491 | + block_list, &cur_index_block, |
1492 | + &cur_offset); |
1493 | + |
1494 | + if (res == -1) |
1495 | + goto failed; |
1496 | + |
1497 | + cur_data_block += res; |
1498 | + blocks -= block; |
1499 | + } |
1500 | + |
1501 | + meta_entry = &meta->meta_entry[i - meta->offset]; |
1502 | + meta_entry->index_block = cur_index_block - sblk->inode_table_start; |
1503 | + meta_entry->offset = cur_offset; |
1504 | + meta_entry->data_block = cur_data_block; |
1505 | + meta->entries ++; |
1506 | + offset ++; |
1507 | + } |
1508 | + |
1509 | + TRACE("get_meta_index: meta->offset %d, meta->entries %d\n", |
1510 | + meta->offset, meta->entries); |
1511 | + |
1512 | + release_meta_index(inode, meta); |
1513 | + } |
1514 | + |
1515 | +all_done: |
1516 | + *index_block = cur_index_block; |
1517 | + *index_offset = cur_offset; |
1518 | + *data_block = cur_data_block; |
1519 | + |
1520 | + return offset * SQUASHFS_META_INDEXES * skip; |
1521 | + |
1522 | +failed: |
1523 | + release_meta_index(inode, meta); |
1524 | + return -1; |
1525 | +} |
1526 | + |
1527 | + |
1528 | +static long long read_blocklist(struct inode *inode, int index, |
1529 | + int readahead_blks, char *block_list, |
1530 | + unsigned short **block_p, unsigned int *bsize) |
1531 | +{ |
1532 | + long long block_ptr; |
1533 | + int offset; |
1534 | + long long block; |
1535 | + int res = get_meta_index(inode, index, &block_ptr, &offset, &block, |
1536 | + block_list); |
1537 | + |
1538 | + TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset" |
1539 | + " 0x%x, block 0x%llx\n", res, index, block_ptr, offset, |
1540 | + block); |
1541 | + |
1542 | + if(res == -1) |
1543 | + goto failure; |
1544 | + |
1545 | + index -= res; |
1546 | + |
1547 | + while ( index ) { |
1548 | + int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index; |
1549 | + int res = read_block_index(inode->i_sb, blocks, block_list, |
1550 | + &block_ptr, &offset); |
1551 | + if (res == -1) |
1552 | + goto failure; |
1553 | + block += res; |
1554 | + index -= blocks; |
1555 | + } |
1556 | + |
1557 | + if (read_block_index(inode->i_sb, 1, block_list, |
1558 | + &block_ptr, &offset) == -1) |
1559 | + goto failure; |
1560 | + *bsize = *((unsigned int *) block_list); |
1561 | + |
1562 | + return block; |
1563 | + |
1564 | +failure: |
1565 | + return 0; |
1566 | +} |
1567 | + |
1568 | + |
1569 | +static int squashfs_readpage(struct file *file, struct page *page) |
1570 | +{ |
1571 | + struct inode *inode = page->mapping->host; |
1572 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; |
1573 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1574 | + unsigned char block_list[SIZE]; |
1575 | + long long block; |
1576 | + unsigned int bsize, i = 0, bytes = 0, byte_offset = 0; |
1577 | + int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT); |
1578 | + void *pageaddr; |
1579 | + struct squashfs_fragment_cache *fragment = NULL; |
1580 | + char *data_ptr = msblk->read_page; |
1581 | + |
1582 | + int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1; |
1583 | + int start_index = page->index & ~mask; |
1584 | + int end_index = start_index | mask; |
1585 | + |
1586 | + TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n", |
1587 | + page->index, |
1588 | + SQUASHFS_I(inode)->start_block); |
1589 | + |
1590 | + if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> |
1591 | + PAGE_CACHE_SHIFT)) |
1592 | + goto skip_read; |
1593 | + |
1594 | + if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK |
1595 | + || index < (i_size_read(inode) >> |
1596 | + sblk->block_log)) { |
1597 | + if ((block = (msblk->read_blocklist)(inode, index, 1, |
1598 | + block_list, NULL, &bsize)) == 0) |
1599 | + goto skip_read; |
1600 | + |
1601 | + down(&msblk->read_page_mutex); |
1602 | + |
1603 | + if (!(bytes = squashfs_read_data(inode->i_sb, msblk->read_page, |
1604 | + block, bsize, NULL))) { |
1605 | + ERROR("Unable to read page, block %llx, size %x\n", block, |
1606 | + bsize); |
1607 | + up(&msblk->read_page_mutex); |
1608 | + goto skip_read; |
1609 | + } |
1610 | + } else { |
1611 | + if ((fragment = get_cached_fragment(inode->i_sb, |
1612 | + SQUASHFS_I(inode)-> |
1613 | + u.s1.fragment_start_block, |
1614 | + SQUASHFS_I(inode)->u.s1.fragment_size)) |
1615 | + == NULL) { |
1616 | + ERROR("Unable to read page, block %llx, size %x\n", |
1617 | + SQUASHFS_I(inode)-> |
1618 | + u.s1.fragment_start_block, |
1619 | + (int) SQUASHFS_I(inode)-> |
1620 | + u.s1.fragment_size); |
1621 | + goto skip_read; |
1622 | + } |
1623 | + bytes = SQUASHFS_I(inode)->u.s1.fragment_offset + |
1624 | + (i_size_read(inode) & (sblk->block_size |
1625 | + - 1)); |
1626 | + byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset; |
1627 | + data_ptr = fragment->data; |
1628 | + } |
1629 | + |
1630 | + for (i = start_index; i <= end_index && byte_offset < bytes; |
1631 | + i++, byte_offset += PAGE_CACHE_SIZE) { |
1632 | + struct page *push_page; |
1633 | + int available_bytes = (bytes - byte_offset) > PAGE_CACHE_SIZE ? |
1634 | + PAGE_CACHE_SIZE : bytes - byte_offset; |
1635 | + |
1636 | + TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n", |
1637 | + bytes, i, byte_offset, available_bytes); |
1638 | + |
1639 | + if (i == page->index) { |
1640 | + pageaddr = kmap_atomic(page, KM_USER0); |
1641 | + memcpy(pageaddr, data_ptr + byte_offset, |
1642 | + available_bytes); |
1643 | + memset(pageaddr + available_bytes, 0, |
1644 | + PAGE_CACHE_SIZE - available_bytes); |
1645 | + kunmap_atomic(pageaddr, KM_USER0); |
1646 | + flush_dcache_page(page); |
1647 | + SetPageUptodate(page); |
1648 | + unlock_page(page); |
1649 | + } else if ((push_page = |
1650 | + grab_cache_page_nowait(page->mapping, i))) { |
1651 | + pageaddr = kmap_atomic(push_page, KM_USER0); |
1652 | + |
1653 | + memcpy(pageaddr, data_ptr + byte_offset, |
1654 | + available_bytes); |
1655 | + memset(pageaddr + available_bytes, 0, |
1656 | + PAGE_CACHE_SIZE - available_bytes); |
1657 | + kunmap_atomic(pageaddr, KM_USER0); |
1658 | + flush_dcache_page(push_page); |
1659 | + SetPageUptodate(push_page); |
1660 | + unlock_page(push_page); |
1661 | + page_cache_release(push_page); |
1662 | + } |
1663 | + } |
1664 | + |
1665 | + if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK |
1666 | + || index < (i_size_read(inode) >> |
1667 | + sblk->block_log)) |
1668 | + up(&msblk->read_page_mutex); |
1669 | + else |
1670 | + release_cached_fragment(msblk, fragment); |
1671 | + |
1672 | + return 0; |
1673 | + |
1674 | +skip_read: |
1675 | + pageaddr = kmap_atomic(page, KM_USER0); |
1676 | + memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes); |
1677 | + kunmap_atomic(pageaddr, KM_USER0); |
1678 | + flush_dcache_page(page); |
1679 | + SetPageUptodate(page); |
1680 | + unlock_page(page); |
1681 | + |
1682 | + return 0; |
1683 | +} |
1684 | + |
1685 | + |
1686 | +static int squashfs_readpage4K(struct file *file, struct page *page) |
1687 | +{ |
1688 | + struct inode *inode = page->mapping->host; |
1689 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; |
1690 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1691 | + unsigned char block_list[SIZE]; |
1692 | + long long block; |
1693 | + unsigned int bsize, bytes = 0; |
1694 | + void *pageaddr; |
1695 | + |
1696 | + TRACE("Entered squashfs_readpage4K, page index %lx, start block %llx\n", |
1697 | + page->index, |
1698 | + SQUASHFS_I(inode)->start_block); |
1699 | + |
1700 | + if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> |
1701 | + PAGE_CACHE_SHIFT)) { |
1702 | + pageaddr = kmap_atomic(page, KM_USER0); |
1703 | + goto skip_read; |
1704 | + } |
1705 | + |
1706 | + if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK |
1707 | + || page->index < (i_size_read(inode) >> |
1708 | + sblk->block_log)) { |
1709 | + block = (msblk->read_blocklist)(inode, page->index, 1, |
1710 | + block_list, NULL, &bsize); |
1711 | + |
1712 | + down(&msblk->read_page_mutex); |
1713 | + bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block, |
1714 | + bsize, NULL); |
1715 | + pageaddr = kmap_atomic(page, KM_USER0); |
1716 | + if (bytes) |
1717 | + memcpy(pageaddr, msblk->read_page, bytes); |
1718 | + else |
1719 | + ERROR("Unable to read page, block %llx, size %x\n", |
1720 | + block, bsize); |
1721 | + up(&msblk->read_page_mutex); |
1722 | + } else { |
1723 | + struct squashfs_fragment_cache *fragment = |
1724 | + get_cached_fragment(inode->i_sb, |
1725 | + SQUASHFS_I(inode)-> |
1726 | + u.s1.fragment_start_block, |
1727 | + SQUASHFS_I(inode)-> u.s1.fragment_size); |
1728 | + pageaddr = kmap_atomic(page, KM_USER0); |
1729 | + if (fragment) { |
1730 | + bytes = i_size_read(inode) & (sblk->block_size - 1); |
1731 | + memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)-> |
1732 | + u.s1.fragment_offset, bytes); |
1733 | + release_cached_fragment(msblk, fragment); |
1734 | + } else |
1735 | + ERROR("Unable to read page, block %llx, size %x\n", |
1736 | + SQUASHFS_I(inode)-> |
1737 | + u.s1.fragment_start_block, (int) |
1738 | + SQUASHFS_I(inode)-> u.s1.fragment_size); |
1739 | + } |
1740 | + |
1741 | +skip_read: |
1742 | + memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes); |
1743 | + kunmap_atomic(pageaddr, KM_USER0); |
1744 | + flush_dcache_page(page); |
1745 | + SetPageUptodate(page); |
1746 | + unlock_page(page); |
1747 | + |
1748 | + return 0; |
1749 | +} |
1750 | + |
1751 | + |
1752 | +static int get_dir_index_using_offset(struct super_block *s, long long |
1753 | + *next_block, unsigned int *next_offset, |
1754 | + long long index_start, |
1755 | + unsigned int index_offset, int i_count, |
1756 | + long long f_pos) |
1757 | +{ |
1758 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
1759 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1760 | + int i, length = 0; |
1761 | + struct squashfs_dir_index index; |
1762 | + |
1763 | + TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n", |
1764 | + i_count, (unsigned int) f_pos); |
1765 | + |
1766 | + f_pos =- 3; |
1767 | + if (f_pos == 0) |
1768 | + goto finish; |
1769 | + |
1770 | + for (i = 0; i < i_count; i++) { |
1771 | + if (msblk->swap) { |
1772 | + struct squashfs_dir_index sindex; |
1773 | + squashfs_get_cached_block(s, (char *) &sindex, |
1774 | + index_start, index_offset, |
1775 | + sizeof(sindex), &index_start, |
1776 | + &index_offset); |
1777 | + SQUASHFS_SWAP_DIR_INDEX(&index, &sindex); |
1778 | + } else |
1779 | + squashfs_get_cached_block(s, (char *) &index, |
1780 | + index_start, index_offset, |
1781 | + sizeof(index), &index_start, |
1782 | + &index_offset); |
1783 | + |
1784 | + if (index.index > f_pos) |
1785 | + break; |
1786 | + |
1787 | + squashfs_get_cached_block(s, NULL, index_start, index_offset, |
1788 | + index.size + 1, &index_start, |
1789 | + &index_offset); |
1790 | + |
1791 | + length = index.index; |
1792 | + *next_block = index.start_block + sblk->directory_table_start; |
1793 | + } |
1794 | + |
1795 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; |
1796 | + |
1797 | +finish: |
1798 | + return length + 3; |
1799 | +} |
1800 | + |
1801 | + |
1802 | +static int get_dir_index_using_name(struct super_block *s, long long |
1803 | + *next_block, unsigned int *next_offset, |
1804 | + long long index_start, |
1805 | + unsigned int index_offset, int i_count, |
1806 | + const char *name, int size) |
1807 | +{ |
1808 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
1809 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1810 | + int i, length = 0; |
1811 | + char buffer[sizeof(struct squashfs_dir_index) + SQUASHFS_NAME_LEN + 1]; |
1812 | + struct squashfs_dir_index *index = (struct squashfs_dir_index *) buffer; |
1813 | + char str[SQUASHFS_NAME_LEN + 1]; |
1814 | + |
1815 | + TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count); |
1816 | + |
1817 | + strncpy(str, name, size); |
1818 | + str[size] = '\0'; |
1819 | + |
1820 | + for (i = 0; i < i_count; i++) { |
1821 | + if (msblk->swap) { |
1822 | + struct squashfs_dir_index sindex; |
1823 | + squashfs_get_cached_block(s, (char *) &sindex, |
1824 | + index_start, index_offset, |
1825 | + sizeof(sindex), &index_start, |
1826 | + &index_offset); |
1827 | + SQUASHFS_SWAP_DIR_INDEX(index, &sindex); |
1828 | + } else |
1829 | + squashfs_get_cached_block(s, (char *) index, |
1830 | + index_start, index_offset, |
1831 | + sizeof(struct squashfs_dir_index), |
1832 | + &index_start, &index_offset); |
1833 | + |
1834 | + squashfs_get_cached_block(s, index->name, index_start, |
1835 | + index_offset, index->size + 1, |
1836 | + &index_start, &index_offset); |
1837 | + |
1838 | + index->name[index->size + 1] = '\0'; |
1839 | + |
1840 | + if (strcmp(index->name, str) > 0) |
1841 | + break; |
1842 | + |
1843 | + length = index->index; |
1844 | + *next_block = index->start_block + sblk->directory_table_start; |
1845 | + } |
1846 | + |
1847 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; |
1848 | + return length + 3; |
1849 | +} |
1850 | + |
1851 | + |
1852 | +static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir) |
1853 | +{ |
1854 | + struct inode *i = file->f_dentry->d_inode; |
1855 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; |
1856 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1857 | + long long next_block = SQUASHFS_I(i)->start_block + |
1858 | + sblk->directory_table_start; |
1859 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0, |
1860 | + dir_count; |
1861 | + struct squashfs_dir_header dirh; |
1862 | + char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1]; |
1863 | + struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer; |
1864 | + |
1865 | + TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset); |
1866 | + |
1867 | + while(file->f_pos < 3) { |
1868 | + char *name; |
1869 | + int size, i_ino; |
1870 | + |
1871 | + if(file->f_pos == 0) { |
1872 | + name = "."; |
1873 | + size = 1; |
1874 | + i_ino = i->i_ino; |
1875 | + } else { |
1876 | + name = ".."; |
1877 | + size = 2; |
1878 | + i_ino = SQUASHFS_I(i)->u.s2.parent_inode; |
1879 | + } |
1880 | + TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n", |
1881 | + (unsigned int) dirent, name, size, (int) |
1882 | + file->f_pos, i_ino, |
1883 | + squashfs_filetype_table[1]); |
1884 | + |
1885 | + if (filldir(dirent, name, size, |
1886 | + file->f_pos, i_ino, |
1887 | + squashfs_filetype_table[1]) < 0) { |
1888 | + TRACE("Filldir returned less than 0\n"); |
1889 | + goto finish; |
1890 | + } |
1891 | + file->f_pos += size; |
1892 | + dirs_read++; |
1893 | + } |
1894 | + |
1895 | + length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset, |
1896 | + SQUASHFS_I(i)->u.s2.directory_index_start, |
1897 | + SQUASHFS_I(i)->u.s2.directory_index_offset, |
1898 | + SQUASHFS_I(i)->u.s2.directory_index_count, |
1899 | + file->f_pos); |
1900 | + |
1901 | + while (length < i_size_read(i)) { |
1902 | + /* read directory header */ |
1903 | + if (msblk->swap) { |
1904 | + struct squashfs_dir_header sdirh; |
1905 | + |
1906 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, |
1907 | + next_block, next_offset, sizeof(sdirh), |
1908 | + &next_block, &next_offset)) |
1909 | + goto failed_read; |
1910 | + |
1911 | + length += sizeof(sdirh); |
1912 | + SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh); |
1913 | + } else { |
1914 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh, |
1915 | + next_block, next_offset, sizeof(dirh), |
1916 | + &next_block, &next_offset)) |
1917 | + goto failed_read; |
1918 | + |
1919 | + length += sizeof(dirh); |
1920 | + } |
1921 | + |
1922 | + dir_count = dirh.count + 1; |
1923 | + while (dir_count--) { |
1924 | + if (msblk->swap) { |
1925 | + struct squashfs_dir_entry sdire; |
1926 | + if (!squashfs_get_cached_block(i->i_sb, (char *) |
1927 | + &sdire, next_block, next_offset, |
1928 | + sizeof(sdire), &next_block, |
1929 | + &next_offset)) |
1930 | + goto failed_read; |
1931 | + |
1932 | + length += sizeof(sdire); |
1933 | + SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire); |
1934 | + } else { |
1935 | + if (!squashfs_get_cached_block(i->i_sb, (char *) |
1936 | + dire, next_block, next_offset, |
1937 | + sizeof(*dire), &next_block, |
1938 | + &next_offset)) |
1939 | + goto failed_read; |
1940 | + |
1941 | + length += sizeof(*dire); |
1942 | + } |
1943 | + |
1944 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, |
1945 | + next_block, next_offset, |
1946 | + dire->size + 1, &next_block, |
1947 | + &next_offset)) |
1948 | + goto failed_read; |
1949 | + |
1950 | + length += dire->size + 1; |
1951 | + |
1952 | + if (file->f_pos >= length) |
1953 | + continue; |
1954 | + |
1955 | + dire->name[dire->size + 1] = '\0'; |
1956 | + |
1957 | + TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n", |
1958 | + (unsigned int) dirent, dire->name, |
1959 | + dire->size + 1, (int) file->f_pos, |
1960 | + dirh.start_block, dire->offset, |
1961 | + dirh.inode_number + dire->inode_number, |
1962 | + squashfs_filetype_table[dire->type]); |
1963 | + |
1964 | + if (filldir(dirent, dire->name, dire->size + 1, |
1965 | + file->f_pos, |
1966 | + dirh.inode_number + dire->inode_number, |
1967 | + squashfs_filetype_table[dire->type]) |
1968 | + < 0) { |
1969 | + TRACE("Filldir returned less than 0\n"); |
1970 | + goto finish; |
1971 | + } |
1972 | + file->f_pos = length; |
1973 | + dirs_read++; |
1974 | + } |
1975 | + } |
1976 | + |
1977 | +finish: |
1978 | + return dirs_read; |
1979 | + |
1980 | +failed_read: |
1981 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, |
1982 | + next_offset); |
1983 | + return 0; |
1984 | +} |
1985 | + |
1986 | + |
1987 | +static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry, |
1988 | + struct nameidata *nd) |
1989 | +{ |
1990 | + const unsigned char *name = dentry->d_name.name; |
1991 | + int len = dentry->d_name.len; |
1992 | + struct inode *inode = NULL; |
1993 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; |
1994 | + struct squashfs_super_block *sblk = &msblk->sblk; |
1995 | + long long next_block = SQUASHFS_I(i)->start_block + |
1996 | + sblk->directory_table_start; |
1997 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, |
1998 | + dir_count; |
1999 | + struct squashfs_dir_header dirh; |
2000 | + char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN]; |
2001 | + struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer; |
2002 | + |
2003 | + TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset); |
2004 | + |
2005 | + if (len > SQUASHFS_NAME_LEN) |
2006 | + goto exit_loop; |
2007 | + |
2008 | + length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset, |
2009 | + SQUASHFS_I(i)->u.s2.directory_index_start, |
2010 | + SQUASHFS_I(i)->u.s2.directory_index_offset, |
2011 | + SQUASHFS_I(i)->u.s2.directory_index_count, name, |
2012 | + len); |
2013 | + |
2014 | + while (length < i_size_read(i)) { |
2015 | + /* read directory header */ |
2016 | + if (msblk->swap) { |
2017 | + struct squashfs_dir_header sdirh; |
2018 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, |
2019 | + next_block, next_offset, sizeof(sdirh), |
2020 | + &next_block, &next_offset)) |
2021 | + goto failed_read; |
2022 | + |
2023 | + length += sizeof(sdirh); |
2024 | + SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh); |
2025 | + } else { |
2026 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh, |
2027 | + next_block, next_offset, sizeof(dirh), |
2028 | + &next_block, &next_offset)) |
2029 | + goto failed_read; |
2030 | + |
2031 | + length += sizeof(dirh); |
2032 | + } |
2033 | + |
2034 | + dir_count = dirh.count + 1; |
2035 | + while (dir_count--) { |
2036 | + if (msblk->swap) { |
2037 | + struct squashfs_dir_entry sdire; |
2038 | + if (!squashfs_get_cached_block(i->i_sb, (char *) |
2039 | + &sdire, next_block,next_offset, |
2040 | + sizeof(sdire), &next_block, |
2041 | + &next_offset)) |
2042 | + goto failed_read; |
2043 | + |
2044 | + length += sizeof(sdire); |
2045 | + SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire); |
2046 | + } else { |
2047 | + if (!squashfs_get_cached_block(i->i_sb, (char *) |
2048 | + dire, next_block,next_offset, |
2049 | + sizeof(*dire), &next_block, |
2050 | + &next_offset)) |
2051 | + goto failed_read; |
2052 | + |
2053 | + length += sizeof(*dire); |
2054 | + } |
2055 | + |
2056 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, |
2057 | + next_block, next_offset, dire->size + 1, |
2058 | + &next_block, &next_offset)) |
2059 | + goto failed_read; |
2060 | + |
2061 | + length += dire->size + 1; |
2062 | + |
2063 | + if (name[0] < dire->name[0]) |
2064 | + goto exit_loop; |
2065 | + |
2066 | + if ((len == dire->size + 1) && !strncmp(name, |
2067 | + dire->name, len)) { |
2068 | + squashfs_inode_t ino = |
2069 | + SQUASHFS_MKINODE(dirh.start_block, |
2070 | + dire->offset); |
2071 | + |
2072 | + TRACE("calling squashfs_iget for directory " |
2073 | + "entry %s, inode %x:%x, %d\n", name, |
2074 | + dirh.start_block, dire->offset, |
2075 | + dirh.inode_number + dire->inode_number); |
2076 | + |
2077 | + inode = (msblk->iget)(i->i_sb, ino); |
2078 | + |
2079 | + goto exit_loop; |
2080 | + } |
2081 | + } |
2082 | + } |
2083 | + |
2084 | +exit_loop: |
2085 | + d_add(dentry, inode); |
2086 | + return ERR_PTR(0); |
2087 | + |
2088 | +failed_read: |
2089 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, |
2090 | + next_offset); |
2091 | + goto exit_loop; |
2092 | +} |
2093 | + |
2094 | + |
2095 | +static void squashfs_put_super(struct super_block *s) |
2096 | +{ |
2097 | + int i; |
2098 | + |
2099 | + if (s->s_fs_info) { |
2100 | + struct squashfs_sb_info *sbi = s->s_fs_info; |
2101 | + if (sbi->block_cache) |
2102 | + for (i = 0; i < SQUASHFS_CACHED_BLKS; i++) |
2103 | + if (sbi->block_cache[i].block != |
2104 | + SQUASHFS_INVALID_BLK) |
2105 | + kfree(sbi->block_cache[i].data); |
2106 | + if (sbi->fragment) |
2107 | + for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) |
2108 | + SQUASHFS_FREE(sbi->fragment[i].data); |
2109 | + kfree(sbi->fragment); |
2110 | + kfree(sbi->block_cache); |
2111 | + kfree(sbi->read_data); |
2112 | + kfree(sbi->read_page); |
2113 | + kfree(sbi->uid); |
2114 | + kfree(sbi->fragment_index); |
2115 | + kfree(sbi->fragment_index_2); |
2116 | + kfree(sbi->meta_index); |
2117 | + kfree(s->s_fs_info); |
2118 | + s->s_fs_info = NULL; |
2119 | + } |
2120 | +} |
2121 | + |
2122 | + |
2123 | +static struct super_block *squashfs_get_sb(struct file_system_type *fs_type, |
2124 | + int flags, const char *dev_name, void *data) |
2125 | +{ |
2126 | + return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super); |
2127 | +} |
2128 | + |
2129 | + |
2130 | +static int __init init_squashfs_fs(void) |
2131 | +{ |
2132 | + int err = init_inodecache(); |
2133 | + if (err) |
2134 | + goto out; |
2135 | + |
2136 | + printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) " |
2137 | + "Phillip Lougher\n"); |
2138 | + |
2139 | + if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) { |
2140 | + ERROR("Failed to allocate zlib workspace\n"); |
2141 | + destroy_inodecache(); |
2142 | + err = -ENOMEM; |
2143 | + goto out; |
2144 | + } |
2145 | + |
2146 | + if ((err = register_filesystem(&squashfs_fs_type))) { |
2147 | + vfree(stream.workspace); |
2148 | + destroy_inodecache(); |
2149 | + } |
2150 | + |
2151 | +out: |
2152 | + return err; |
2153 | +} |
2154 | + |
2155 | + |
2156 | +static void __exit exit_squashfs_fs(void) |
2157 | +{ |
2158 | + vfree(stream.workspace); |
2159 | + unregister_filesystem(&squashfs_fs_type); |
2160 | + destroy_inodecache(); |
2161 | +} |
2162 | + |
2163 | + |
2164 | +static kmem_cache_t * squashfs_inode_cachep; |
2165 | + |
2166 | + |
2167 | +static struct inode *squashfs_alloc_inode(struct super_block *sb) |
2168 | +{ |
2169 | + struct squashfs_inode_info *ei; |
2170 | + ei = kmem_cache_alloc(squashfs_inode_cachep, SLAB_KERNEL); |
2171 | + if (!ei) |
2172 | + return NULL; |
2173 | + return &ei->vfs_inode; |
2174 | +} |
2175 | + |
2176 | + |
2177 | +static void squashfs_destroy_inode(struct inode *inode) |
2178 | +{ |
2179 | + kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode)); |
2180 | +} |
2181 | + |
2182 | + |
2183 | +static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
2184 | +{ |
2185 | + struct squashfs_inode_info *ei = foo; |
2186 | + |
2187 | + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
2188 | + SLAB_CTOR_CONSTRUCTOR) |
2189 | + inode_init_once(&ei->vfs_inode); |
2190 | +} |
2191 | + |
2192 | + |
2193 | +static int __init init_inodecache(void) |
2194 | +{ |
2195 | + squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", |
2196 | + sizeof(struct squashfs_inode_info), |
2197 | + 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, |
2198 | + init_once, NULL); |
2199 | + if (squashfs_inode_cachep == NULL) |
2200 | + return -ENOMEM; |
2201 | + return 0; |
2202 | +} |
2203 | + |
2204 | + |
2205 | +static void destroy_inodecache(void) |
2206 | +{ |
2207 | + if (kmem_cache_destroy(squashfs_inode_cachep)) |
2208 | + printk(KERN_INFO "squashfs_inode_cache: not all structures " |
2209 | + "were freed\n"); |
2210 | +} |
2211 | + |
2212 | + |
2213 | +module_init(init_squashfs_fs); |
2214 | +module_exit(exit_squashfs_fs); |
2215 | +MODULE_DESCRIPTION("squashfs, a compressed read-only filesystem"); |
2216 | +MODULE_AUTHOR("Phillip Lougher <phillip@lougher.org.uk>"); |
2217 | +MODULE_LICENSE("GPL"); |
2218 | diff --new-file -urp linux-2.6.15/fs/squashfs/Makefile linux-2.6.15-squashfs3.0/fs/squashfs/Makefile |
2219 | --- linux-2.6.15/fs/squashfs/Makefile 1970-01-01 01:00:00.000000000 +0100 |
2220 | +++ linux-2.6.15-squashfs3.0/fs/squashfs/Makefile 2006-03-07 21:12:37.000000000 +0000 |
2221 | @@ -0,0 +1,7 @@ |
2222 | +# |
2223 | +# Makefile for the linux squashfs routines. |
2224 | +# |
2225 | + |
2226 | +obj-$(CONFIG_SQUASHFS) += squashfs.o |
2227 | +squashfs-y += inode.o |
2228 | +squashfs-y += squashfs2_0.o |
2229 | diff --new-file -urp linux-2.6.15/fs/squashfs/squashfs2_0.c linux-2.6.15-squashfs3.0/fs/squashfs/squashfs2_0.c |
2230 | --- linux-2.6.15/fs/squashfs/squashfs2_0.c 1970-01-01 01:00:00.000000000 +0100 |
2231 | +++ linux-2.6.15-squashfs3.0/fs/squashfs/squashfs2_0.c 2006-03-07 21:12:37.000000000 +0000 |
2232 | @@ -0,0 +1,758 @@ |
2233 | +/* |
2234 | + * Squashfs - a compressed read only filesystem for Linux |
2235 | + * |
2236 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006 |
2237 | + * Phillip Lougher <phillip@lougher.org.uk> |
2238 | + * |
2239 | + * This program is free software; you can redistribute it and/or |
2240 | + * modify it under the terms of the GNU General Public License |
2241 | + * as published by the Free Software Foundation; either version 2, |
2242 | + * or (at your option) any later version. |
2243 | + * |
2244 | + * This program is distributed in the hope that it will be useful, |
2245 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
2246 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
2247 | + * GNU General Public License for more details. |
2248 | + * |
2249 | + * You should have received a copy of the GNU General Public License |
2250 | + * along with this program; if not, write to the Free Software |
2251 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
2252 | + * |
2253 | + * squashfs2_0.c |
2254 | + */ |
2255 | + |
2256 | +#include <linux/types.h> |
2257 | +#include <linux/squashfs_fs.h> |
2258 | +#include <linux/module.h> |
2259 | +#include <linux/errno.h> |
2260 | +#include <linux/slab.h> |
2261 | +#include <linux/fs.h> |
2262 | +#include <linux/smp_lock.h> |
2263 | +#include <linux/slab.h> |
2264 | +#include <linux/squashfs_fs_sb.h> |
2265 | +#include <linux/squashfs_fs_i.h> |
2266 | +#include <linux/buffer_head.h> |
2267 | +#include <linux/vfs.h> |
2268 | +#include <linux/init.h> |
2269 | +#include <linux/dcache.h> |
2270 | +#include <linux/wait.h> |
2271 | +#include <linux/zlib.h> |
2272 | +#include <linux/blkdev.h> |
2273 | +#include <linux/vmalloc.h> |
2274 | +#include <asm/uaccess.h> |
2275 | +#include <asm/semaphore.h> |
2276 | + |
2277 | +#include "squashfs.h" |
2278 | +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir); |
2279 | +static struct dentry *squashfs_lookup_2(struct inode *, struct dentry *, |
2280 | + struct nameidata *); |
2281 | + |
2282 | +static struct file_operations squashfs_dir_ops_2 = { |
2283 | + .read = generic_read_dir, |
2284 | + .readdir = squashfs_readdir_2 |
2285 | +}; |
2286 | + |
2287 | +static struct inode_operations squashfs_dir_inode_ops_2 = { |
2288 | + .lookup = squashfs_lookup_2 |
2289 | +}; |
2290 | + |
2291 | +static unsigned char squashfs_filetype_table[] = { |
2292 | + DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK |
2293 | +}; |
2294 | + |
2295 | +static int read_fragment_index_table_2(struct super_block *s) |
2296 | +{ |
2297 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
2298 | + struct squashfs_super_block *sblk = &msblk->sblk; |
2299 | + |
2300 | + if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2 |
2301 | + (sblk->fragments), GFP_KERNEL))) { |
2302 | + ERROR("Failed to allocate uid/gid table\n"); |
2303 | + return 0; |
2304 | + } |
2305 | + |
2306 | + if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) && |
2307 | + !squashfs_read_data(s, (char *) |
2308 | + msblk->fragment_index_2, |
2309 | + sblk->fragment_table_start, |
2310 | + SQUASHFS_FRAGMENT_INDEX_BYTES_2 |
2311 | + (sblk->fragments) | |
2312 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) { |
2313 | + ERROR("unable to read fragment index table\n"); |
2314 | + return 0; |
2315 | + } |
2316 | + |
2317 | + if (msblk->swap) { |
2318 | + int i; |
2319 | + unsigned int fragment; |
2320 | + |
2321 | + for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments); |
2322 | + i++) { |
2323 | + SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment), |
2324 | + &msblk->fragment_index_2[i], 1); |
2325 | + msblk->fragment_index_2[i] = fragment; |
2326 | + } |
2327 | + } |
2328 | + |
2329 | + return 1; |
2330 | +} |
2331 | + |
2332 | + |
2333 | +static int get_fragment_location_2(struct super_block *s, unsigned int fragment, |
2334 | + long long *fragment_start_block, |
2335 | + unsigned int *fragment_size) |
2336 | +{ |
2337 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
2338 | + long long start_block = |
2339 | + msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)]; |
2340 | + int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment); |
2341 | + struct squashfs_fragment_entry_2 fragment_entry; |
2342 | + |
2343 | + if (msblk->swap) { |
2344 | + struct squashfs_fragment_entry_2 sfragment_entry; |
2345 | + |
2346 | + if (!squashfs_get_cached_block(s, (char *) &sfragment_entry, |
2347 | + start_block, offset, |
2348 | + sizeof(sfragment_entry), &start_block, |
2349 | + &offset)) |
2350 | + goto out; |
2351 | + SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry); |
2352 | + } else |
2353 | + if (!squashfs_get_cached_block(s, (char *) &fragment_entry, |
2354 | + start_block, offset, |
2355 | + sizeof(fragment_entry), &start_block, |
2356 | + &offset)) |
2357 | + goto out; |
2358 | + |
2359 | + *fragment_start_block = fragment_entry.start_block; |
2360 | + *fragment_size = fragment_entry.size; |
2361 | + |
2362 | + return 1; |
2363 | + |
2364 | +out: |
2365 | + return 0; |
2366 | +} |
2367 | + |
2368 | + |
2369 | +static struct inode *squashfs_new_inode(struct super_block *s, |
2370 | + struct squashfs_base_inode_header_2 *inodeb, unsigned int ino) |
2371 | +{ |
2372 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
2373 | + struct squashfs_super_block *sblk = &msblk->sblk; |
2374 | + struct inode *i = new_inode(s); |
2375 | + |
2376 | + if (i) { |
2377 | + i->i_ino = ino; |
2378 | + i->i_mtime.tv_sec = sblk->mkfs_time; |
2379 | + i->i_atime.tv_sec = sblk->mkfs_time; |
2380 | + i->i_ctime.tv_sec = sblk->mkfs_time; |
2381 | + i->i_uid = msblk->uid[inodeb->uid]; |
2382 | + i->i_mode = inodeb->mode; |
2383 | + i->i_nlink = 1; |
2384 | + i->i_size = 0; |
2385 | + if (inodeb->guid == SQUASHFS_GUIDS) |
2386 | + i->i_gid = i->i_uid; |
2387 | + else |
2388 | + i->i_gid = msblk->guid[inodeb->guid]; |
2389 | + } |
2390 | + |
2391 | + return i; |
2392 | +} |
2393 | + |
2394 | + |
2395 | +static struct inode *squashfs_iget_2(struct super_block *s, squashfs_inode_t inode) |
2396 | +{ |
2397 | + struct inode *i; |
2398 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
2399 | + struct squashfs_super_block *sblk = &msblk->sblk; |
2400 | + unsigned int block = SQUASHFS_INODE_BLK(inode) + |
2401 | + sblk->inode_table_start; |
2402 | + unsigned int offset = SQUASHFS_INODE_OFFSET(inode); |
2403 | + unsigned int ino = SQUASHFS_MK_VFS_INODE(block |
2404 | + - sblk->inode_table_start, offset); |
2405 | + long long next_block; |
2406 | + unsigned int next_offset; |
2407 | + union squashfs_inode_header_2 id, sid; |
2408 | + struct squashfs_base_inode_header_2 *inodeb = &id.base, |
2409 | + *sinodeb = &sid.base; |
2410 | + |
2411 | + TRACE("Entered squashfs_iget\n"); |
2412 | + |
2413 | + if (msblk->swap) { |
2414 | + if (!squashfs_get_cached_block(s, (char *) sinodeb, block, |
2415 | + offset, sizeof(*sinodeb), &next_block, |
2416 | + &next_offset)) |
2417 | + goto failed_read; |
2418 | + SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb, |
2419 | + sizeof(*sinodeb)); |
2420 | + } else |
2421 | + if (!squashfs_get_cached_block(s, (char *) inodeb, block, |
2422 | + offset, sizeof(*inodeb), &next_block, |
2423 | + &next_offset)) |
2424 | + goto failed_read; |
2425 | + |
2426 | + switch(inodeb->inode_type) { |
2427 | + case SQUASHFS_FILE_TYPE: { |
2428 | + struct squashfs_reg_inode_header_2 *inodep = &id.reg; |
2429 | + struct squashfs_reg_inode_header_2 *sinodep = &sid.reg; |
2430 | + long long frag_blk; |
2431 | + unsigned int frag_size; |
2432 | + |
2433 | + if (msblk->swap) { |
2434 | + if (!squashfs_get_cached_block(s, (char *) |
2435 | + sinodep, block, offset, |
2436 | + sizeof(*sinodep), &next_block, |
2437 | + &next_offset)) |
2438 | + goto failed_read; |
2439 | + SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep); |
2440 | + } else |
2441 | + if (!squashfs_get_cached_block(s, (char *) |
2442 | + inodep, block, offset, |
2443 | + sizeof(*inodep), &next_block, |
2444 | + &next_offset)) |
2445 | + goto failed_read; |
2446 | + |
2447 | + frag_blk = SQUASHFS_INVALID_BLK; |
2448 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG && |
2449 | + !get_fragment_location_2(s, |
2450 | + inodep->fragment, &frag_blk, &frag_size)) |
2451 | + goto failed_read; |
2452 | + |
2453 | + if((i = squashfs_new_inode(s, inodeb, ino)) == NULL) |
2454 | + goto failed_read1; |
2455 | + |
2456 | + i->i_size = inodep->file_size; |
2457 | + i->i_fop = &generic_ro_fops; |
2458 | + i->i_mode |= S_IFREG; |
2459 | + i->i_mtime.tv_sec = inodep->mtime; |
2460 | + i->i_atime.tv_sec = inodep->mtime; |
2461 | + i->i_ctime.tv_sec = inodep->mtime; |
2462 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; |
2463 | + i->i_blksize = PAGE_CACHE_SIZE; |
2464 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; |
2465 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; |
2466 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; |
2467 | + SQUASHFS_I(i)->start_block = inodep->start_block; |
2468 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; |
2469 | + SQUASHFS_I(i)->offset = next_offset; |
2470 | + if (sblk->block_size > 4096) |
2471 | + i->i_data.a_ops = &squashfs_aops; |
2472 | + else |
2473 | + i->i_data.a_ops = &squashfs_aops_4K; |
2474 | + |
2475 | + TRACE("File inode %x:%x, start_block %x, " |
2476 | + "block_list_start %llx, offset %x\n", |
2477 | + SQUASHFS_INODE_BLK(inode), offset, |
2478 | + inodep->start_block, next_block, |
2479 | + next_offset); |
2480 | + break; |
2481 | + } |
2482 | + case SQUASHFS_DIR_TYPE: { |
2483 | + struct squashfs_dir_inode_header_2 *inodep = &id.dir; |
2484 | + struct squashfs_dir_inode_header_2 *sinodep = &sid.dir; |
2485 | + |
2486 | + if (msblk->swap) { |
2487 | + if (!squashfs_get_cached_block(s, (char *) |
2488 | + sinodep, block, offset, |
2489 | + sizeof(*sinodep), &next_block, |
2490 | + &next_offset)) |
2491 | + goto failed_read; |
2492 | + SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep); |
2493 | + } else |
2494 | + if (!squashfs_get_cached_block(s, (char *) |
2495 | + inodep, block, offset, |
2496 | + sizeof(*inodep), &next_block, |
2497 | + &next_offset)) |
2498 | + goto failed_read; |
2499 | + |
2500 | + if((i = squashfs_new_inode(s, inodeb, ino)) == NULL) |
2501 | + goto failed_read1; |
2502 | + |
2503 | + i->i_size = inodep->file_size; |
2504 | + i->i_op = &squashfs_dir_inode_ops_2; |
2505 | + i->i_fop = &squashfs_dir_ops_2; |
2506 | + i->i_mode |= S_IFDIR; |
2507 | + i->i_mtime.tv_sec = inodep->mtime; |
2508 | + i->i_atime.tv_sec = inodep->mtime; |
2509 | + i->i_ctime.tv_sec = inodep->mtime; |
2510 | + SQUASHFS_I(i)->start_block = inodep->start_block; |
2511 | + SQUASHFS_I(i)->offset = inodep->offset; |
2512 | + SQUASHFS_I(i)->u.s2.directory_index_count = 0; |
2513 | + SQUASHFS_I(i)->u.s2.parent_inode = 0; |
2514 | + |
2515 | + TRACE("Directory inode %x:%x, start_block %x, offset " |
2516 | + "%x\n", SQUASHFS_INODE_BLK(inode), |
2517 | + offset, inodep->start_block, |
2518 | + inodep->offset); |
2519 | + break; |
2520 | + } |
2521 | + case SQUASHFS_LDIR_TYPE: { |
2522 | + struct squashfs_ldir_inode_header_2 *inodep = &id.ldir; |
2523 | + struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir; |
2524 | + |
2525 | + if (msblk->swap) { |
2526 | + if (!squashfs_get_cached_block(s, (char *) |
2527 | + sinodep, block, offset, |
2528 | + sizeof(*sinodep), &next_block, |
2529 | + &next_offset)) |
2530 | + goto failed_read; |
2531 | + SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep, |
2532 | + sinodep); |
2533 | + } else |
2534 | + if (!squashfs_get_cached_block(s, (char *) |
2535 | + inodep, block, offset, |
2536 | + sizeof(*inodep), &next_block, |
2537 | + &next_offset)) |
2538 | + goto failed_read; |
2539 | + |
2540 | + if((i = squashfs_new_inode(s, inodeb, ino)) == NULL) |
2541 | + goto failed_read1; |
2542 | + |
2543 | + i->i_size = inodep->file_size; |
2544 | + i->i_op = &squashfs_dir_inode_ops_2; |
2545 | + i->i_fop = &squashfs_dir_ops_2; |
2546 | + i->i_mode |= S_IFDIR; |
2547 | + i->i_mtime.tv_sec = inodep->mtime; |
2548 | + i->i_atime.tv_sec = inodep->mtime; |
2549 | + i->i_ctime.tv_sec = inodep->mtime; |
2550 | + SQUASHFS_I(i)->start_block = inodep->start_block; |
2551 | + SQUASHFS_I(i)->offset = inodep->offset; |
2552 | + SQUASHFS_I(i)->u.s2.directory_index_start = next_block; |
2553 | + SQUASHFS_I(i)->u.s2.directory_index_offset = |
2554 | + next_offset; |
2555 | + SQUASHFS_I(i)->u.s2.directory_index_count = |
2556 | + inodep->i_count; |
2557 | + SQUASHFS_I(i)->u.s2.parent_inode = 0; |
2558 | + |
2559 | + TRACE("Long directory inode %x:%x, start_block %x, " |
2560 | + "offset %x\n", |
2561 | + SQUASHFS_INODE_BLK(inode), offset, |
2562 | + inodep->start_block, inodep->offset); |
2563 | + break; |
2564 | + } |
2565 | + case SQUASHFS_SYMLINK_TYPE: { |
2566 | + struct squashfs_symlink_inode_header_2 *inodep = |
2567 | + &id.symlink; |
2568 | + struct squashfs_symlink_inode_header_2 *sinodep = |
2569 | + &sid.symlink; |
2570 | + |
2571 | + if (msblk->swap) { |
2572 | + if (!squashfs_get_cached_block(s, (char *) |
2573 | + sinodep, block, offset, |
2574 | + sizeof(*sinodep), &next_block, |
2575 | + &next_offset)) |
2576 | + goto failed_read; |
2577 | + SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep, |
2578 | + sinodep); |
2579 | + } else |
2580 | + if (!squashfs_get_cached_block(s, (char *) |
2581 | + inodep, block, offset, |
2582 | + sizeof(*inodep), &next_block, |
2583 | + &next_offset)) |
2584 | + goto failed_read; |
2585 | + |
2586 | + if((i = squashfs_new_inode(s, inodeb, ino)) == NULL) |
2587 | + goto failed_read1; |
2588 | + |
2589 | + i->i_size = inodep->symlink_size; |
2590 | + i->i_op = &page_symlink_inode_operations; |
2591 | + i->i_data.a_ops = &squashfs_symlink_aops; |
2592 | + i->i_mode |= S_IFLNK; |
2593 | + SQUASHFS_I(i)->start_block = next_block; |
2594 | + SQUASHFS_I(i)->offset = next_offset; |
2595 | + |
2596 | + TRACE("Symbolic link inode %x:%x, start_block %llx, " |
2597 | + "offset %x\n", |
2598 | + SQUASHFS_INODE_BLK(inode), offset, |
2599 | + next_block, next_offset); |
2600 | + break; |
2601 | + } |
2602 | + case SQUASHFS_BLKDEV_TYPE: |
2603 | + case SQUASHFS_CHRDEV_TYPE: { |
2604 | + struct squashfs_dev_inode_header_2 *inodep = &id.dev; |
2605 | + struct squashfs_dev_inode_header_2 *sinodep = &sid.dev; |
2606 | + |
2607 | + if (msblk->swap) { |
2608 | + if (!squashfs_get_cached_block(s, (char *) |
2609 | + sinodep, block, offset, |
2610 | + sizeof(*sinodep), &next_block, |
2611 | + &next_offset)) |
2612 | + goto failed_read; |
2613 | + SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep); |
2614 | + } else |
2615 | + if (!squashfs_get_cached_block(s, (char *) |
2616 | + inodep, block, offset, |
2617 | + sizeof(*inodep), &next_block, |
2618 | + &next_offset)) |
2619 | + goto failed_read; |
2620 | + |
2621 | + if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL) |
2622 | + goto failed_read1; |
2623 | + |
2624 | + i->i_mode |= (inodeb->inode_type == |
2625 | + SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : |
2626 | + S_IFBLK; |
2627 | + init_special_inode(i, i->i_mode, |
2628 | + old_decode_dev(inodep->rdev)); |
2629 | + |
2630 | + TRACE("Device inode %x:%x, rdev %x\n", |
2631 | + SQUASHFS_INODE_BLK(inode), offset, |
2632 | + inodep->rdev); |
2633 | + break; |
2634 | + } |
2635 | + case SQUASHFS_FIFO_TYPE: |
2636 | + case SQUASHFS_SOCKET_TYPE: { |
2637 | + if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL) |
2638 | + goto failed_read1; |
2639 | + |
2640 | + i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE) |
2641 | + ? S_IFIFO : S_IFSOCK; |
2642 | + init_special_inode(i, i->i_mode, 0); |
2643 | + break; |
2644 | + } |
2645 | + default: |
2646 | + ERROR("Unknown inode type %d in squashfs_iget!\n", |
2647 | + inodeb->inode_type); |
2648 | + goto failed_read1; |
2649 | + } |
2650 | + |
2651 | + insert_inode_hash(i); |
2652 | + return i; |
2653 | + |
2654 | +failed_read: |
2655 | + ERROR("Unable to read inode [%x:%x]\n", block, offset); |
2656 | + |
2657 | +failed_read1: |
2658 | + return NULL; |
2659 | +} |
2660 | + |
2661 | + |
2662 | +static int get_dir_index_using_offset(struct super_block *s, long long |
2663 | + *next_block, unsigned int *next_offset, |
2664 | + long long index_start, |
2665 | + unsigned int index_offset, int i_count, |
2666 | + long long f_pos) |
2667 | +{ |
2668 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
2669 | + struct squashfs_super_block *sblk = &msblk->sblk; |
2670 | + int i, length = 0; |
2671 | + struct squashfs_dir_index_2 index; |
2672 | + |
2673 | + TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n", |
2674 | + i_count, (unsigned int) f_pos); |
2675 | + |
2676 | + if (f_pos == 0) |
2677 | + goto finish; |
2678 | + |
2679 | + for (i = 0; i < i_count; i++) { |
2680 | + if (msblk->swap) { |
2681 | + struct squashfs_dir_index_2 sindex; |
2682 | + squashfs_get_cached_block(s, (char *) &sindex, |
2683 | + index_start, index_offset, |
2684 | + sizeof(sindex), &index_start, |
2685 | + &index_offset); |
2686 | + SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex); |
2687 | + } else |
2688 | + squashfs_get_cached_block(s, (char *) &index, |
2689 | + index_start, index_offset, |
2690 | + sizeof(index), &index_start, |
2691 | + &index_offset); |
2692 | + |
2693 | + if (index.index > f_pos) |
2694 | + break; |
2695 | + |
2696 | + squashfs_get_cached_block(s, NULL, index_start, index_offset, |
2697 | + index.size + 1, &index_start, |
2698 | + &index_offset); |
2699 | + |
2700 | + length = index.index; |
2701 | + *next_block = index.start_block + sblk->directory_table_start; |
2702 | + } |
2703 | + |
2704 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; |
2705 | + |
2706 | +finish: |
2707 | + return length; |
2708 | +} |
2709 | + |
2710 | + |
2711 | +static int get_dir_index_using_name(struct super_block *s, long long |
2712 | + *next_block, unsigned int *next_offset, |
2713 | + long long index_start, |
2714 | + unsigned int index_offset, int i_count, |
2715 | + const char *name, int size) |
2716 | +{ |
2717 | + struct squashfs_sb_info *msblk = s->s_fs_info; |
2718 | + struct squashfs_super_block *sblk = &msblk->sblk; |
2719 | + int i, length = 0; |
2720 | + char buffer[sizeof(struct squashfs_dir_index_2) + SQUASHFS_NAME_LEN + 1]; |
2721 | + struct squashfs_dir_index_2 *index = (struct squashfs_dir_index_2 *) buffer; |
2722 | + char str[SQUASHFS_NAME_LEN + 1]; |
2723 | + |
2724 | + TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count); |
2725 | + |
2726 | + strncpy(str, name, size); |
2727 | + str[size] = '\0'; |
2728 | + |
2729 | + for (i = 0; i < i_count; i++) { |
2730 | + if (msblk->swap) { |
2731 | + struct squashfs_dir_index_2 sindex; |
2732 | + squashfs_get_cached_block(s, (char *) &sindex, |
2733 | + index_start, index_offset, |
2734 | + sizeof(sindex), &index_start, |
2735 | + &index_offset); |
2736 | + SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex); |
2737 | + } else |
2738 | + squashfs_get_cached_block(s, (char *) index, |
2739 | + index_start, index_offset, |
2740 | + sizeof(struct squashfs_dir_index_2), |
2741 | + &index_start, &index_offset); |
2742 | + |
2743 | + squashfs_get_cached_block(s, index->name, index_start, |
2744 | + index_offset, index->size + 1, |
2745 | + &index_start, &index_offset); |
2746 | + |
2747 | + index->name[index->size + 1] = '\0'; |
2748 | + |
2749 | + if (strcmp(index->name, str) > 0) |
2750 | + break; |
2751 | + |
2752 | + length = index->index; |
2753 | + *next_block = index->start_block + sblk->directory_table_start; |
2754 | + } |
2755 | + |
2756 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; |
2757 | + return length; |
2758 | +} |
2759 | + |
2760 | + |
2761 | +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir) |
2762 | +{ |
2763 | + struct inode *i = file->f_dentry->d_inode; |
2764 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; |
2765 | + struct squashfs_super_block *sblk = &msblk->sblk; |
2766 | + long long next_block = SQUASHFS_I(i)->start_block + |
2767 | + sblk->directory_table_start; |
2768 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0, |
2769 | + dir_count; |
2770 | + struct squashfs_dir_header_2 dirh; |
2771 | + char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN + 1]; |
2772 | + struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer; |
2773 | + |
2774 | + TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset); |
2775 | + |
2776 | + length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset, |
2777 | + SQUASHFS_I(i)->u.s2.directory_index_start, |
2778 | + SQUASHFS_I(i)->u.s2.directory_index_offset, |
2779 | + SQUASHFS_I(i)->u.s2.directory_index_count, |
2780 | + file->f_pos); |
2781 | + |
2782 | + while (length < i_size_read(i)) { |
2783 | + /* read directory header */ |
2784 | + if (msblk->swap) { |
2785 | + struct squashfs_dir_header_2 sdirh; |
2786 | + |
2787 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, |
2788 | + next_block, next_offset, sizeof(sdirh), |
2789 | + &next_block, &next_offset)) |
2790 | + goto failed_read; |
2791 | + |
2792 | + length += sizeof(sdirh); |
2793 | + SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh); |
2794 | + } else { |
2795 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh, |
2796 | + next_block, next_offset, sizeof(dirh), |
2797 | + &next_block, &next_offset)) |
2798 | + goto failed_read; |
2799 | + |
2800 | + length += sizeof(dirh); |
2801 | + } |
2802 | + |
2803 | + dir_count = dirh.count + 1; |
2804 | + while (dir_count--) { |
2805 | + if (msblk->swap) { |
2806 | + struct squashfs_dir_entry_2 sdire; |
2807 | + if (!squashfs_get_cached_block(i->i_sb, (char *) |
2808 | + &sdire, next_block, next_offset, |
2809 | + sizeof(sdire), &next_block, |
2810 | + &next_offset)) |
2811 | + goto failed_read; |
2812 | + |
2813 | + length += sizeof(sdire); |
2814 | + SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire); |
2815 | + } else { |
2816 | + if (!squashfs_get_cached_block(i->i_sb, (char *) |
2817 | + dire, next_block, next_offset, |
2818 | + sizeof(*dire), &next_block, |
2819 | + &next_offset)) |
2820 | + goto failed_read; |
2821 | + |
2822 | + length += sizeof(*dire); |
2823 | + } |
2824 | + |
2825 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, |
2826 | + next_block, next_offset, |
2827 | + dire->size + 1, &next_block, |
2828 | + &next_offset)) |
2829 | + goto failed_read; |
2830 | + |
2831 | + length += dire->size + 1; |
2832 | + |
2833 | + if (file->f_pos >= length) |
2834 | + continue; |
2835 | + |
2836 | + dire->name[dire->size + 1] = '\0'; |
2837 | + |
2838 | + TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n", |
2839 | + (unsigned int) dirent, dire->name, |
2840 | + dire->size + 1, (int) file->f_pos, |
2841 | + dirh.start_block, dire->offset, |
2842 | + squashfs_filetype_table[dire->type]); |
2843 | + |
2844 | + if (filldir(dirent, dire->name, dire->size + 1, |
2845 | + file->f_pos, SQUASHFS_MK_VFS_INODE( |
2846 | + dirh.start_block, dire->offset), |
2847 | + squashfs_filetype_table[dire->type]) |
2848 | + < 0) { |
2849 | + TRACE("Filldir returned less than 0\n"); |
2850 | + goto finish; |
2851 | + } |
2852 | + file->f_pos = length; |
2853 | + dirs_read++; |
2854 | + } |
2855 | + } |
2856 | + |
2857 | +finish: |
2858 | + return dirs_read; |
2859 | + |
2860 | +failed_read: |
2861 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, |
2862 | + next_offset); |
2863 | + return 0; |
2864 | +} |
2865 | + |
2866 | + |
2867 | +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry, |
2868 | + struct nameidata *nd) |
2869 | +{ |
2870 | + const unsigned char *name = dentry->d_name.name; |
2871 | + int len = dentry->d_name.len; |
2872 | + struct inode *inode = NULL; |
2873 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; |
2874 | + struct squashfs_super_block *sblk = &msblk->sblk; |
2875 | + long long next_block = SQUASHFS_I(i)->start_block + |
2876 | + sblk->directory_table_start; |
2877 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, |
2878 | + dir_count; |
2879 | + struct squashfs_dir_header_2 dirh; |
2880 | + char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN]; |
2881 | + struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer; |
2882 | + int sorted = sblk->s_major == 2 && sblk->s_minor >= 1; |
2883 | + |
2884 | + TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset); |
2885 | + |
2886 | + if (len > SQUASHFS_NAME_LEN) |
2887 | + goto exit_loop; |
2888 | + |
2889 | + length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset, |
2890 | + SQUASHFS_I(i)->u.s2.directory_index_start, |
2891 | + SQUASHFS_I(i)->u.s2.directory_index_offset, |
2892 | + SQUASHFS_I(i)->u.s2.directory_index_count, name, |
2893 | + len); |
2894 | + |
2895 | + while (length < i_size_read(i)) { |
2896 | + /* read directory header */ |
2897 | + if (msblk->swap) { |
2898 | + struct squashfs_dir_header_2 sdirh; |
2899 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, |
2900 | + next_block, next_offset, sizeof(sdirh), |
2901 | + &next_block, &next_offset)) |
2902 | + goto failed_read; |
2903 | + |
2904 | + length += sizeof(sdirh); |
2905 | + SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh); |
2906 | + } else { |
2907 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh, |
2908 | + next_block, next_offset, sizeof(dirh), |
2909 | + &next_block, &next_offset)) |
2910 | + goto failed_read; |
2911 | + |
2912 | + length += sizeof(dirh); |
2913 | + } |
2914 | + |
2915 | + dir_count = dirh.count + 1; |
2916 | + while (dir_count--) { |
2917 | + if (msblk->swap) { |
2918 | + struct squashfs_dir_entry_2 sdire; |
2919 | + if (!squashfs_get_cached_block(i->i_sb, (char *) |
2920 | + &sdire, next_block,next_offset, |
2921 | + sizeof(sdire), &next_block, |
2922 | + &next_offset)) |
2923 | + goto failed_read; |
2924 | + |
2925 | + length += sizeof(sdire); |
2926 | + SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire); |
2927 | + } else { |
2928 | + if (!squashfs_get_cached_block(i->i_sb, (char *) |
2929 | + dire, next_block,next_offset, |
2930 | + sizeof(*dire), &next_block, |
2931 | + &next_offset)) |
2932 | + goto failed_read; |
2933 | + |
2934 | + length += sizeof(*dire); |
2935 | + } |
2936 | + |
2937 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, |
2938 | + next_block, next_offset, dire->size + 1, |
2939 | + &next_block, &next_offset)) |
2940 | + goto failed_read; |
2941 | + |
2942 | + length += dire->size + 1; |
2943 | + |
2944 | + if (sorted && name[0] < dire->name[0]) |
2945 | + goto exit_loop; |
2946 | + |
2947 | + if ((len == dire->size + 1) && !strncmp(name, |
2948 | + dire->name, len)) { |
2949 | + squashfs_inode_t ino = |
2950 | + SQUASHFS_MKINODE(dirh.start_block, |
2951 | + dire->offset); |
2952 | + |
2953 | + TRACE("calling squashfs_iget for directory " |
2954 | + "entry %s, inode %x:%x, %lld\n", name, |
2955 | + dirh.start_block, dire->offset, ino); |
2956 | + |
2957 | + inode = (msblk->iget)(i->i_sb, ino); |
2958 | + |
2959 | + goto exit_loop; |
2960 | + } |
2961 | + } |
2962 | + } |
2963 | + |
2964 | +exit_loop: |
2965 | + d_add(dentry, inode); |
2966 | + return ERR_PTR(0); |
2967 | + |
2968 | +failed_read: |
2969 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, |
2970 | + next_offset); |
2971 | + goto exit_loop; |
2972 | +} |
2973 | + |
2974 | + |
2975 | +int squashfs_2_0_supported(struct squashfs_sb_info *msblk) |
2976 | +{ |
2977 | + struct squashfs_super_block *sblk = &msblk->sblk; |
2978 | + |
2979 | + msblk->iget = squashfs_iget_2; |
2980 | + msblk->read_fragment_index_table = read_fragment_index_table_2; |
2981 | + |
2982 | + sblk->bytes_used = sblk->bytes_used_2; |
2983 | + sblk->uid_start = sblk->uid_start_2; |
2984 | + sblk->guid_start = sblk->guid_start_2; |
2985 | + sblk->inode_table_start = sblk->inode_table_start_2; |
2986 | + sblk->directory_table_start = sblk->directory_table_start_2; |
2987 | + sblk->fragment_table_start = sblk->fragment_table_start_2; |
2988 | + |
2989 | + return 1; |
2990 | +} |
2991 | diff --new-file -urp linux-2.6.15/fs/squashfs/squashfs.h linux-2.6.15-squashfs3.0/fs/squashfs/squashfs.h |
2992 | --- linux-2.6.15/fs/squashfs/squashfs.h 1970-01-01 01:00:00.000000000 +0100 |
2993 | +++ linux-2.6.15-squashfs3.0/fs/squashfs/squashfs.h 2006-03-07 21:12:37.000000000 +0000 |
2994 | @@ -0,0 +1,86 @@ |
2995 | +/* |
2996 | + * Squashfs - a compressed read only filesystem for Linux |
2997 | + * |
2998 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006 |
2999 | + * Phillip Lougher <phillip@lougher.org.uk> |
3000 | + * |
3001 | + * This program is free software; you can redistribute it and/or |
3002 | + * modify it under the terms of the GNU General Public License |
3003 | + * as published by the Free Software Foundation; either version 2, |
3004 | + * or (at your option) any later version. |
3005 | + * |
3006 | + * This program is distributed in the hope that it will be useful, |
3007 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
3008 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
3009 | + * GNU General Public License for more details. |
3010 | + * |
3011 | + * You should have received a copy of the GNU General Public License |
3012 | + * along with this program; if not, write to the Free Software |
3013 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
3014 | + * |
3015 | + * squashfs.h |
3016 | + */ |
3017 | + |
3018 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY |
3019 | +#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY |
3020 | +#endif |
3021 | + |
3022 | +#ifdef SQUASHFS_TRACE |
3023 | +#define TRACE(s, args...) printk(KERN_NOTICE "SQUASHFS: "s, ## args) |
3024 | +#else |
3025 | +#define TRACE(s, args...) {} |
3026 | +#endif |
3027 | + |
3028 | +#define ERROR(s, args...) printk(KERN_ERR "SQUASHFS error: "s, ## args) |
3029 | + |
3030 | +#define SERROR(s, args...) do { \ |
3031 | + if (!silent) \ |
3032 | + printk(KERN_ERR "SQUASHFS error: "s, ## args);\ |
3033 | + } while(0) |
3034 | + |
3035 | +#define WARNING(s, args...) printk(KERN_WARNING "SQUASHFS: "s, ## args) |
3036 | + |
3037 | +static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode) |
3038 | +{ |
3039 | + return list_entry(inode, struct squashfs_inode_info, vfs_inode); |
3040 | +} |
3041 | + |
3042 | +#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY) |
3043 | +#define SQSH_EXTERN |
3044 | +extern unsigned int squashfs_read_data(struct super_block *s, char *buffer, |
3045 | + long long index, unsigned int length, |
3046 | + long long *next_index); |
3047 | +extern int squashfs_get_cached_block(struct super_block *s, char *buffer, |
3048 | + long long block, unsigned int offset, |
3049 | + int length, long long *next_block, |
3050 | + unsigned int *next_offset); |
3051 | +extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct |
3052 | + squashfs_fragment_cache *fragment); |
3053 | +extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block |
3054 | + *s, long long start_block, |
3055 | + int length); |
3056 | +extern struct address_space_operations squashfs_symlink_aops; |
3057 | +extern struct address_space_operations squashfs_aops; |
3058 | +extern struct address_space_operations squashfs_aops_4K; |
3059 | +extern struct inode_operations squashfs_dir_inode_ops; |
3060 | +#else |
3061 | +#define SQSH_EXTERN static |
3062 | +#endif |
3063 | + |
3064 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY |
3065 | +extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk); |
3066 | +#else |
3067 | +static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk) |
3068 | +{ |
3069 | + return 0; |
3070 | +} |
3071 | +#endif |
3072 | + |
3073 | +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY |
3074 | +extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk); |
3075 | +#else |
3076 | +static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk) |
3077 | +{ |
3078 | + return 0; |
3079 | +} |
3080 | +#endif |
3081 | diff --new-file -urp linux-2.6.15/include/linux/squashfs_fs.h linux-2.6.15-squashfs3.0/include/linux/squashfs_fs.h |
3082 | --- linux-2.6.15/include/linux/squashfs_fs.h 1970-01-01 01:00:00.000000000 +0100 |
3083 | +++ linux-2.6.15-squashfs3.0/include/linux/squashfs_fs.h 2006-03-07 21:12:37.000000000 +0000 |
3084 | @@ -0,0 +1,911 @@ |
3085 | +#ifndef SQUASHFS_FS |
3086 | +#define SQUASHFS_FS |
3087 | + |
3088 | +/* |
3089 | + * Squashfs |
3090 | + * |
3091 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006 |
3092 | + * Phillip Lougher <phillip@lougher.org.uk> |
3093 | + * |
3094 | + * This program is free software; you can redistribute it and/or |
3095 | + * modify it under the terms of the GNU General Public License |
3096 | + * as published by the Free Software Foundation; either version 2, |
3097 | + * or (at your option) any later version. |
3098 | + * |
3099 | + * This program is distributed in the hope that it will be useful, |
3100 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
3101 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
3102 | + * GNU General Public License for more details. |
3103 | + * |
3104 | + * You should have received a copy of the GNU General Public License |
3105 | + * along with this program; if not, write to the Free Software |
3106 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
3107 | + * |
3108 | + * squashfs_fs.h |
3109 | + */ |
3110 | + |
3111 | +#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY |
3112 | +#define CONFIG_SQUASHFS_2_0_COMPATIBILITY |
3113 | +#endif |
3114 | + |
3115 | +#ifdef CONFIG_SQUASHFS_VMALLOC |
3116 | +#define SQUASHFS_ALLOC(a) vmalloc(a) |
3117 | +#define SQUASHFS_FREE(a) vfree(a) |
3118 | +#else |
3119 | +#define SQUASHFS_ALLOC(a) kmalloc(a, GFP_KERNEL) |
3120 | +#define SQUASHFS_FREE(a) kfree(a) |
3121 | +#endif |
3122 | +#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE |
3123 | +#define SQUASHFS_MAJOR 3 |
3124 | +#define SQUASHFS_MINOR 0 |
3125 | +#define SQUASHFS_MAGIC 0x73717368 |
3126 | +#define SQUASHFS_MAGIC_SWAP 0x68737173 |
3127 | +#define SQUASHFS_START 0 |
3128 | + |
3129 | +/* size of metadata (inode and directory) blocks */ |
3130 | +#define SQUASHFS_METADATA_SIZE 8192 |
3131 | +#define SQUASHFS_METADATA_LOG 13 |
3132 | + |
3133 | +/* default size of data blocks */ |
3134 | +#define SQUASHFS_FILE_SIZE 65536 |
3135 | +#define SQUASHFS_FILE_LOG 16 |
3136 | + |
3137 | +#define SQUASHFS_FILE_MAX_SIZE 65536 |
3138 | + |
3139 | +/* Max number of uids and gids */ |
3140 | +#define SQUASHFS_UIDS 256 |
3141 | +#define SQUASHFS_GUIDS 255 |
3142 | + |
3143 | +/* Max length of filename (not 255) */ |
3144 | +#define SQUASHFS_NAME_LEN 256 |
3145 | + |
3146 | +#define SQUASHFS_INVALID ((long long) 0xffffffffffff) |
3147 | +#define SQUASHFS_INVALID_FRAG ((unsigned int) 0xffffffff) |
3148 | +#define SQUASHFS_INVALID_BLK ((long long) -1) |
3149 | +#define SQUASHFS_USED_BLK ((long long) -2) |
3150 | + |
3151 | +/* Filesystem flags */ |
3152 | +#define SQUASHFS_NOI 0 |
3153 | +#define SQUASHFS_NOD 1 |
3154 | +#define SQUASHFS_CHECK 2 |
3155 | +#define SQUASHFS_NOF 3 |
3156 | +#define SQUASHFS_NO_FRAG 4 |
3157 | +#define SQUASHFS_ALWAYS_FRAG 5 |
3158 | +#define SQUASHFS_DUPLICATE 6 |
3159 | + |
3160 | +#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1) |
3161 | + |
3162 | +#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \ |
3163 | + SQUASHFS_NOI) |
3164 | + |
3165 | +#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \ |
3166 | + SQUASHFS_NOD) |
3167 | + |
3168 | +#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ |
3169 | + SQUASHFS_NOF) |
3170 | + |
3171 | +#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ |
3172 | + SQUASHFS_NO_FRAG) |
3173 | + |
3174 | +#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ |
3175 | + SQUASHFS_ALWAYS_FRAG) |
3176 | + |
3177 | +#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \ |
3178 | + SQUASHFS_DUPLICATE) |
3179 | + |
3180 | +#define SQUASHFS_CHECK_DATA(flags) SQUASHFS_BIT(flags, \ |
3181 | + SQUASHFS_CHECK) |
3182 | + |
3183 | +#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \ |
3184 | + duplicate_checking) (noi | (nod << 1) | (check_data << 2) \ |
3185 | + | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \ |
3186 | + (duplicate_checking << 6)) |
3187 | + |
3188 | +/* Max number of types and file types */ |
3189 | +#define SQUASHFS_DIR_TYPE 1 |
3190 | +#define SQUASHFS_FILE_TYPE 2 |
3191 | +#define SQUASHFS_SYMLINK_TYPE 3 |
3192 | +#define SQUASHFS_BLKDEV_TYPE 4 |
3193 | +#define SQUASHFS_CHRDEV_TYPE 5 |
3194 | +#define SQUASHFS_FIFO_TYPE 6 |
3195 | +#define SQUASHFS_SOCKET_TYPE 7 |
3196 | +#define SQUASHFS_LDIR_TYPE 8 |
3197 | +#define SQUASHFS_LREG_TYPE 9 |
3198 | + |
3199 | +/* 1.0 filesystem type definitions */ |
3200 | +#define SQUASHFS_TYPES 5 |
3201 | +#define SQUASHFS_IPC_TYPE 0 |
3202 | + |
3203 | +/* Flag whether block is compressed or uncompressed, bit is set if block is |
3204 | + * uncompressed */ |
3205 | +#define SQUASHFS_COMPRESSED_BIT (1 << 15) |
3206 | + |
3207 | +#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \ |
3208 | + (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT) |
3209 | + |
3210 | +#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT)) |
3211 | + |
3212 | +#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24) |
3213 | + |
3214 | +#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) (((B) & \ |
3215 | + ~SQUASHFS_COMPRESSED_BIT_BLOCK) ? (B) & \ |
3216 | + ~SQUASHFS_COMPRESSED_BIT_BLOCK : SQUASHFS_COMPRESSED_BIT_BLOCK) |
3217 | + |
3218 | +#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK)) |
3219 | + |
3220 | +/* |
3221 | + * Inode number ops. Inodes consist of a compressed block number, and an |
3222 | + * uncompressed offset within that block |
3223 | + */ |
3224 | +#define SQUASHFS_INODE_BLK(a) ((unsigned int) ((a) >> 16)) |
3225 | + |
3226 | +#define SQUASHFS_INODE_OFFSET(a) ((unsigned int) ((a) & 0xffff)) |
3227 | + |
3228 | +#define SQUASHFS_MKINODE(A, B) ((squashfs_inode_t)(((squashfs_inode_t) (A)\ |
3229 | + << 16) + (B))) |
3230 | + |
3231 | +/* Compute 32 bit VFS inode number from squashfs inode number */ |
3232 | +#define SQUASHFS_MK_VFS_INODE(a, b) ((unsigned int) (((a) << 8) + \ |
3233 | + ((b) >> 2) + 1)) |
3234 | +/* XXX */ |
3235 | + |
3236 | +/* Translate between VFS mode and squashfs mode */ |
3237 | +#define SQUASHFS_MODE(a) ((a) & 0xfff) |
3238 | + |
3239 | +/* fragment and fragment table defines */ |
3240 | +#define SQUASHFS_FRAGMENT_BYTES(A) (A * sizeof(struct squashfs_fragment_entry)) |
3241 | + |
3242 | +#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \ |
3243 | + SQUASHFS_METADATA_SIZE) |
3244 | + |
3245 | +#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \ |
3246 | + SQUASHFS_METADATA_SIZE) |
3247 | + |
3248 | +#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \ |
3249 | + SQUASHFS_METADATA_SIZE - 1) / \ |
3250 | + SQUASHFS_METADATA_SIZE) |
3251 | + |
3252 | +#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\ |
3253 | + sizeof(long long)) |
3254 | + |
3255 | +/* cached data constants for filesystem */ |
3256 | +#define SQUASHFS_CACHED_BLKS 8 |
3257 | + |
3258 | +#define SQUASHFS_MAX_FILE_SIZE_LOG 64 |
3259 | + |
3260 | +#define SQUASHFS_MAX_FILE_SIZE ((long long) 1 << \ |
3261 | + (SQUASHFS_MAX_FILE_SIZE_LOG - 2)) |
3262 | + |
3263 | +#define SQUASHFS_MARKER_BYTE 0xff |
3264 | + |
3265 | +/* meta index cache */ |
3266 | +#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int)) |
3267 | +#define SQUASHFS_META_ENTRIES 31 |
3268 | +#define SQUASHFS_META_NUMBER 8 |
3269 | +#define SQUASHFS_SLOTS 4 |
3270 | + |
3271 | +struct meta_entry { |
3272 | + long long data_block; |
3273 | + unsigned int index_block; |
3274 | + unsigned short offset; |
3275 | + unsigned short pad; |
3276 | +}; |
3277 | + |
3278 | +struct meta_index { |
3279 | + unsigned int inode_number; |
3280 | + unsigned int offset; |
3281 | + unsigned short entries; |
3282 | + unsigned short skip; |
3283 | + unsigned short locked; |
3284 | + unsigned short pad; |
3285 | + struct meta_entry meta_entry[SQUASHFS_META_ENTRIES]; |
3286 | +}; |
3287 | + |
3288 | + |
3289 | +/* |
3290 | + * definitions for structures on disk |
3291 | + */ |
3292 | + |
3293 | +typedef long long squashfs_block_t; |
3294 | +typedef long long squashfs_inode_t; |
3295 | + |
3296 | +struct squashfs_super_block { |
3297 | + unsigned int s_magic; |
3298 | + unsigned int inodes; |
3299 | + unsigned int bytes_used_2; |
3300 | + unsigned int uid_start_2; |
3301 | + unsigned int guid_start_2; |
3302 | + unsigned int inode_table_start_2; |
3303 | + unsigned int directory_table_start_2; |
3304 | + unsigned int s_major:16; |
3305 | + unsigned int s_minor:16; |
3306 | + unsigned int block_size_1:16; |
3307 | + unsigned int block_log:16; |
3308 | + unsigned int flags:8; |
3309 | + unsigned int no_uids:8; |
3310 | + unsigned int no_guids:8; |
3311 | + unsigned int mkfs_time /* time of filesystem creation */; |
3312 | + squashfs_inode_t root_inode; |
3313 | + unsigned int block_size; |
3314 | + unsigned int fragments; |
3315 | + unsigned int fragment_table_start_2; |
3316 | + long long bytes_used; |
3317 | + long long uid_start; |
3318 | + long long guid_start; |
3319 | + long long inode_table_start; |
3320 | + long long directory_table_start; |
3321 | + long long fragment_table_start; |
3322 | + long long unused; |
3323 | +} __attribute__ ((packed)); |
3324 | + |
3325 | +struct squashfs_dir_index { |
3326 | + unsigned int index; |
3327 | + unsigned int start_block; |
3328 | + unsigned char size; |
3329 | + unsigned char name[0]; |
3330 | +} __attribute__ ((packed)); |
3331 | + |
3332 | +#define SQUASHFS_BASE_INODE_HEADER \ |
3333 | + unsigned int inode_type:4; \ |
3334 | + unsigned int mode:12; \ |
3335 | + unsigned int uid:8; \ |
3336 | + unsigned int guid:8; \ |
3337 | + unsigned int mtime; \ |
3338 | + unsigned int inode_number; |
3339 | + |
3340 | +struct squashfs_base_inode_header { |
3341 | + SQUASHFS_BASE_INODE_HEADER; |
3342 | +} __attribute__ ((packed)); |
3343 | + |
3344 | +struct squashfs_ipc_inode_header { |
3345 | + SQUASHFS_BASE_INODE_HEADER; |
3346 | + unsigned int nlink; |
3347 | +} __attribute__ ((packed)); |
3348 | + |
3349 | +struct squashfs_dev_inode_header { |
3350 | + SQUASHFS_BASE_INODE_HEADER; |
3351 | + unsigned int nlink; |
3352 | + unsigned short rdev; |
3353 | +} __attribute__ ((packed)); |
3354 | + |
3355 | +struct squashfs_symlink_inode_header { |
3356 | + SQUASHFS_BASE_INODE_HEADER; |
3357 | + unsigned int nlink; |
3358 | + unsigned short symlink_size; |
3359 | + char symlink[0]; |
3360 | +} __attribute__ ((packed)); |
3361 | + |
3362 | +struct squashfs_reg_inode_header { |
3363 | + SQUASHFS_BASE_INODE_HEADER; |
3364 | + squashfs_block_t start_block; |
3365 | + unsigned int fragment; |
3366 | + unsigned int offset; |
3367 | + unsigned int file_size; |
3368 | + unsigned short block_list[0]; |
3369 | +} __attribute__ ((packed)); |
3370 | + |
3371 | +struct squashfs_lreg_inode_header { |
3372 | + SQUASHFS_BASE_INODE_HEADER; |
3373 | + unsigned int nlink; |
3374 | + squashfs_block_t start_block; |
3375 | + unsigned int fragment; |
3376 | + unsigned int offset; |
3377 | + long long file_size; |
3378 | + unsigned short block_list[0]; |
3379 | +} __attribute__ ((packed)); |
3380 | + |
3381 | +struct squashfs_dir_inode_header { |
3382 | + SQUASHFS_BASE_INODE_HEADER; |
3383 | + unsigned int nlink; |
3384 | + unsigned int file_size:19; |
3385 | + unsigned int offset:13; |
3386 | + unsigned int start_block; |
3387 | + unsigned int parent_inode; |
3388 | +} __attribute__ ((packed)); |
3389 | + |
3390 | +struct squashfs_ldir_inode_header { |
3391 | + SQUASHFS_BASE_INODE_HEADER; |
3392 | + unsigned int nlink; |
3393 | + unsigned int file_size:27; |
3394 | + unsigned int offset:13; |
3395 | + unsigned int start_block; |
3396 | + unsigned int i_count:16; |
3397 | + unsigned int parent_inode; |
3398 | + struct squashfs_dir_index index[0]; |
3399 | +} __attribute__ ((packed)); |
3400 | + |
3401 | +union squashfs_inode_header { |
3402 | + struct squashfs_base_inode_header base; |
3403 | + struct squashfs_dev_inode_header dev; |
3404 | + struct squashfs_symlink_inode_header symlink; |
3405 | + struct squashfs_reg_inode_header reg; |
3406 | + struct squashfs_lreg_inode_header lreg; |
3407 | + struct squashfs_dir_inode_header dir; |
3408 | + struct squashfs_ldir_inode_header ldir; |
3409 | + struct squashfs_ipc_inode_header ipc; |
3410 | +}; |
3411 | + |
3412 | +struct squashfs_dir_entry { |
3413 | + unsigned int offset:13; |
3414 | + unsigned int type:3; |
3415 | + unsigned int size:8; |
3416 | + int inode_number:16; |
3417 | + char name[0]; |
3418 | +} __attribute__ ((packed)); |
3419 | + |
3420 | +struct squashfs_dir_header { |
3421 | + unsigned int count:8; |
3422 | + unsigned int start_block; |
3423 | + unsigned int inode_number; |
3424 | +} __attribute__ ((packed)); |
3425 | + |
3426 | +struct squashfs_fragment_entry { |
3427 | + long long start_block; |
3428 | + unsigned int size; |
3429 | + unsigned int unused; |
3430 | +} __attribute__ ((packed)); |
3431 | + |
3432 | +extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen); |
3433 | +extern int squashfs_uncompress_init(void); |
3434 | +extern int squashfs_uncompress_exit(void); |
3435 | + |
3436 | +/* |
3437 | + * macros to convert each packed bitfield structure from little endian to big |
3438 | + * endian and vice versa. These are needed when creating or using a filesystem |
3439 | + * on a machine with different byte ordering to the target architecture. |
3440 | + * |
3441 | + */ |
3442 | + |
3443 | +#define SQUASHFS_SWAP_START \ |
3444 | + int bits;\ |
3445 | + int b_pos;\ |
3446 | + unsigned long long val;\ |
3447 | + unsigned char *s;\ |
3448 | + unsigned char *d; |
3449 | + |
3450 | +#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\ |
3451 | + SQUASHFS_SWAP_START\ |
3452 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\ |
3453 | + SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\ |
3454 | + SQUASHFS_SWAP((s)->inodes, d, 32, 32);\ |
3455 | + SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\ |
3456 | + SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\ |
3457 | + SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\ |
3458 | + SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\ |
3459 | + SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\ |
3460 | + SQUASHFS_SWAP((s)->s_major, d, 224, 16);\ |
3461 | + SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\ |
3462 | + SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\ |
3463 | + SQUASHFS_SWAP((s)->block_log, d, 272, 16);\ |
3464 | + SQUASHFS_SWAP((s)->flags, d, 288, 8);\ |
3465 | + SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\ |
3466 | + SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\ |
3467 | + SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\ |
3468 | + SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\ |
3469 | + SQUASHFS_SWAP((s)->block_size, d, 408, 32);\ |
3470 | + SQUASHFS_SWAP((s)->fragments, d, 440, 32);\ |
3471 | + SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\ |
3472 | + SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\ |
3473 | + SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\ |
3474 | + SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\ |
3475 | + SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\ |
3476 | + SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\ |
3477 | + SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\ |
3478 | + SQUASHFS_SWAP((s)->unused, d, 888, 64);\ |
3479 | +} |
3480 | + |
3481 | +#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\ |
3482 | + SQUASHFS_MEMSET(s, d, n);\ |
3483 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ |
3484 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ |
3485 | + SQUASHFS_SWAP((s)->uid, d, 16, 8);\ |
3486 | + SQUASHFS_SWAP((s)->guid, d, 24, 8);\ |
3487 | + SQUASHFS_SWAP((s)->mtime, d, 32, 32);\ |
3488 | + SQUASHFS_SWAP((s)->inode_number, d, 64, 32); |
3489 | + |
3490 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\ |
3491 | + SQUASHFS_SWAP_START\ |
3492 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\ |
3493 | +} |
3494 | + |
3495 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\ |
3496 | + SQUASHFS_SWAP_START\ |
3497 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ |
3498 | + sizeof(struct squashfs_ipc_inode_header))\ |
3499 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ |
3500 | +} |
3501 | + |
3502 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\ |
3503 | + SQUASHFS_SWAP_START\ |
3504 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ |
3505 | + sizeof(struct squashfs_dev_inode_header)); \ |
3506 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ |
3507 | + SQUASHFS_SWAP((s)->rdev, d, 128, 16);\ |
3508 | +} |
3509 | + |
3510 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\ |
3511 | + SQUASHFS_SWAP_START\ |
3512 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ |
3513 | + sizeof(struct squashfs_symlink_inode_header));\ |
3514 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ |
3515 | + SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\ |
3516 | +} |
3517 | + |
3518 | +#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\ |
3519 | + SQUASHFS_SWAP_START\ |
3520 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ |
3521 | + sizeof(struct squashfs_reg_inode_header));\ |
3522 | + SQUASHFS_SWAP((s)->start_block, d, 96, 64);\ |
3523 | + SQUASHFS_SWAP((s)->fragment, d, 160, 32);\ |
3524 | + SQUASHFS_SWAP((s)->offset, d, 192, 32);\ |
3525 | + SQUASHFS_SWAP((s)->file_size, d, 224, 32);\ |
3526 | +} |
3527 | + |
3528 | +#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\ |
3529 | + SQUASHFS_SWAP_START\ |
3530 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ |
3531 | + sizeof(struct squashfs_lreg_inode_header));\ |
3532 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ |
3533 | + SQUASHFS_SWAP((s)->start_block, d, 128, 64);\ |
3534 | + SQUASHFS_SWAP((s)->fragment, d, 192, 32);\ |
3535 | + SQUASHFS_SWAP((s)->offset, d, 224, 32);\ |
3536 | + SQUASHFS_SWAP((s)->file_size, d, 256, 64);\ |
3537 | +} |
3538 | + |
3539 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\ |
3540 | + SQUASHFS_SWAP_START\ |
3541 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ |
3542 | + sizeof(struct squashfs_dir_inode_header));\ |
3543 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ |
3544 | + SQUASHFS_SWAP((s)->file_size, d, 128, 19);\ |
3545 | + SQUASHFS_SWAP((s)->offset, d, 147, 13);\ |
3546 | + SQUASHFS_SWAP((s)->start_block, d, 160, 32);\ |
3547 | + SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\ |
3548 | +} |
3549 | + |
3550 | +#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\ |
3551 | + SQUASHFS_SWAP_START\ |
3552 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ |
3553 | + sizeof(struct squashfs_ldir_inode_header));\ |
3554 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ |
3555 | + SQUASHFS_SWAP((s)->file_size, d, 128, 27);\ |
3556 | + SQUASHFS_SWAP((s)->offset, d, 155, 13);\ |
3557 | + SQUASHFS_SWAP((s)->start_block, d, 168, 32);\ |
3558 | + SQUASHFS_SWAP((s)->i_count, d, 200, 16);\ |
3559 | + SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\ |
3560 | +} |
3561 | + |
3562 | +#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\ |
3563 | + SQUASHFS_SWAP_START\ |
3564 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\ |
3565 | + SQUASHFS_SWAP((s)->index, d, 0, 32);\ |
3566 | + SQUASHFS_SWAP((s)->start_block, d, 32, 32);\ |
3567 | + SQUASHFS_SWAP((s)->size, d, 64, 8);\ |
3568 | +} |
3569 | + |
3570 | +#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\ |
3571 | + SQUASHFS_SWAP_START\ |
3572 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\ |
3573 | + SQUASHFS_SWAP((s)->count, d, 0, 8);\ |
3574 | + SQUASHFS_SWAP((s)->start_block, d, 8, 32);\ |
3575 | + SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\ |
3576 | +} |
3577 | + |
3578 | +#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\ |
3579 | + SQUASHFS_SWAP_START\ |
3580 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\ |
3581 | + SQUASHFS_SWAP((s)->offset, d, 0, 13);\ |
3582 | + SQUASHFS_SWAP((s)->type, d, 13, 3);\ |
3583 | + SQUASHFS_SWAP((s)->size, d, 16, 8);\ |
3584 | + SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\ |
3585 | +} |
3586 | + |
3587 | +#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\ |
3588 | + SQUASHFS_SWAP_START\ |
3589 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\ |
3590 | + SQUASHFS_SWAP((s)->start_block, d, 0, 64);\ |
3591 | + SQUASHFS_SWAP((s)->size, d, 64, 32);\ |
3592 | +} |
3593 | + |
3594 | +#define SQUASHFS_SWAP_SHORTS(s, d, n) {\ |
3595 | + int entry;\ |
3596 | + int bit_position;\ |
3597 | + SQUASHFS_SWAP_START\ |
3598 | + SQUASHFS_MEMSET(s, d, n * 2);\ |
3599 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ |
3600 | + 16)\ |
3601 | + SQUASHFS_SWAP(s[entry], d, bit_position, 16);\ |
3602 | +} |
3603 | + |
3604 | +#define SQUASHFS_SWAP_INTS(s, d, n) {\ |
3605 | + int entry;\ |
3606 | + int bit_position;\ |
3607 | + SQUASHFS_SWAP_START\ |
3608 | + SQUASHFS_MEMSET(s, d, n * 4);\ |
3609 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ |
3610 | + 32)\ |
3611 | + SQUASHFS_SWAP(s[entry], d, bit_position, 32);\ |
3612 | +} |
3613 | + |
3614 | +#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\ |
3615 | + int entry;\ |
3616 | + int bit_position;\ |
3617 | + SQUASHFS_SWAP_START\ |
3618 | + SQUASHFS_MEMSET(s, d, n * 8);\ |
3619 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ |
3620 | + 64)\ |
3621 | + SQUASHFS_SWAP(s[entry], d, bit_position, 64);\ |
3622 | +} |
3623 | + |
3624 | +#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\ |
3625 | + int entry;\ |
3626 | + int bit_position;\ |
3627 | + SQUASHFS_SWAP_START\ |
3628 | + SQUASHFS_MEMSET(s, d, n * bits / 8);\ |
3629 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ |
3630 | + bits)\ |
3631 | + SQUASHFS_SWAP(s[entry], d, bit_position, bits);\ |
3632 | +} |
3633 | + |
3634 | +#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n) |
3635 | + |
3636 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY |
3637 | + |
3638 | +struct squashfs_base_inode_header_1 { |
3639 | + unsigned int inode_type:4; |
3640 | + unsigned int mode:12; /* protection */ |
3641 | + unsigned int uid:4; /* index into uid table */ |
3642 | + unsigned int guid:4; /* index into guid table */ |
3643 | +} __attribute__ ((packed)); |
3644 | + |
3645 | +struct squashfs_ipc_inode_header_1 { |
3646 | + unsigned int inode_type:4; |
3647 | + unsigned int mode:12; /* protection */ |
3648 | + unsigned int uid:4; /* index into uid table */ |
3649 | + unsigned int guid:4; /* index into guid table */ |
3650 | + unsigned int type:4; |
3651 | + unsigned int offset:4; |
3652 | +} __attribute__ ((packed)); |
3653 | + |
3654 | +struct squashfs_dev_inode_header_1 { |
3655 | + unsigned int inode_type:4; |
3656 | + unsigned int mode:12; /* protection */ |
3657 | + unsigned int uid:4; /* index into uid table */ |
3658 | + unsigned int guid:4; /* index into guid table */ |
3659 | + unsigned short rdev; |
3660 | +} __attribute__ ((packed)); |
3661 | + |
3662 | +struct squashfs_symlink_inode_header_1 { |
3663 | + unsigned int inode_type:4; |
3664 | + unsigned int mode:12; /* protection */ |
3665 | + unsigned int uid:4; /* index into uid table */ |
3666 | + unsigned int guid:4; /* index into guid table */ |
3667 | + unsigned short symlink_size; |
3668 | + char symlink[0]; |
3669 | +} __attribute__ ((packed)); |
3670 | + |
3671 | +struct squashfs_reg_inode_header_1 { |
3672 | + unsigned int inode_type:4; |
3673 | + unsigned int mode:12; /* protection */ |
3674 | + unsigned int uid:4; /* index into uid table */ |
3675 | + unsigned int guid:4; /* index into guid table */ |
3676 | + unsigned int mtime; |
3677 | + unsigned int start_block; |
3678 | + unsigned int file_size:32; |
3679 | + unsigned short block_list[0]; |
3680 | +} __attribute__ ((packed)); |
3681 | + |
3682 | +struct squashfs_dir_inode_header_1 { |
3683 | + unsigned int inode_type:4; |
3684 | + unsigned int mode:12; /* protection */ |
3685 | + unsigned int uid:4; /* index into uid table */ |
3686 | + unsigned int guid:4; /* index into guid table */ |
3687 | + unsigned int file_size:19; |
3688 | + unsigned int offset:13; |
3689 | + unsigned int mtime; |
3690 | + unsigned int start_block:24; |
3691 | +} __attribute__ ((packed)); |
3692 | + |
3693 | +#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \ |
3694 | + SQUASHFS_MEMSET(s, d, n);\ |
3695 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ |
3696 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ |
3697 | + SQUASHFS_SWAP((s)->uid, d, 16, 4);\ |
3698 | + SQUASHFS_SWAP((s)->guid, d, 20, 4); |
3699 | + |
3700 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\ |
3701 | + SQUASHFS_SWAP_START\ |
3702 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\ |
3703 | +} |
3704 | + |
3705 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\ |
3706 | + SQUASHFS_SWAP_START\ |
3707 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ |
3708 | + sizeof(struct squashfs_ipc_inode_header_1));\ |
3709 | + SQUASHFS_SWAP((s)->type, d, 24, 4);\ |
3710 | + SQUASHFS_SWAP((s)->offset, d, 28, 4);\ |
3711 | +} |
3712 | + |
3713 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\ |
3714 | + SQUASHFS_SWAP_START\ |
3715 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ |
3716 | + sizeof(struct squashfs_dev_inode_header_1));\ |
3717 | + SQUASHFS_SWAP((s)->rdev, d, 24, 16);\ |
3718 | +} |
3719 | + |
3720 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\ |
3721 | + SQUASHFS_SWAP_START\ |
3722 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ |
3723 | + sizeof(struct squashfs_symlink_inode_header_1));\ |
3724 | + SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\ |
3725 | +} |
3726 | + |
3727 | +#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\ |
3728 | + SQUASHFS_SWAP_START\ |
3729 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ |
3730 | + sizeof(struct squashfs_reg_inode_header_1));\ |
3731 | + SQUASHFS_SWAP((s)->mtime, d, 24, 32);\ |
3732 | + SQUASHFS_SWAP((s)->start_block, d, 56, 32);\ |
3733 | + SQUASHFS_SWAP((s)->file_size, d, 88, 32);\ |
3734 | +} |
3735 | + |
3736 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\ |
3737 | + SQUASHFS_SWAP_START\ |
3738 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ |
3739 | + sizeof(struct squashfs_dir_inode_header_1));\ |
3740 | + SQUASHFS_SWAP((s)->file_size, d, 24, 19);\ |
3741 | + SQUASHFS_SWAP((s)->offset, d, 43, 13);\ |
3742 | + SQUASHFS_SWAP((s)->mtime, d, 56, 32);\ |
3743 | + SQUASHFS_SWAP((s)->start_block, d, 88, 24);\ |
3744 | +} |
3745 | + |
3746 | +#endif |
3747 | + |
3748 | +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY |
3749 | + |
3750 | +struct squashfs_dir_index_2 { |
3751 | + unsigned int index:27; |
3752 | + unsigned int start_block:29; |
3753 | + unsigned char size; |
3754 | + unsigned char name[0]; |
3755 | +} __attribute__ ((packed)); |
3756 | + |
3757 | +struct squashfs_base_inode_header_2 { |
3758 | + unsigned int inode_type:4; |
3759 | + unsigned int mode:12; /* protection */ |
3760 | + unsigned int uid:8; /* index into uid table */ |
3761 | + unsigned int guid:8; /* index into guid table */ |
3762 | +} __attribute__ ((packed)); |
3763 | + |
3764 | +struct squashfs_ipc_inode_header_2 { |
3765 | + unsigned int inode_type:4; |
3766 | + unsigned int mode:12; /* protection */ |
3767 | + unsigned int uid:8; /* index into uid table */ |
3768 | + unsigned int guid:8; /* index into guid table */ |
3769 | +} __attribute__ ((packed)); |
3770 | + |
3771 | +struct squashfs_dev_inode_header_2 { |
3772 | + unsigned int inode_type:4; |
3773 | + unsigned int mode:12; /* protection */ |
3774 | + unsigned int uid:8; /* index into uid table */ |
3775 | + unsigned int guid:8; /* index into guid table */ |
3776 | + unsigned short rdev; |
3777 | +} __attribute__ ((packed)); |
3778 | + |
3779 | +struct squashfs_symlink_inode_header_2 { |
3780 | + unsigned int inode_type:4; |
3781 | + unsigned int mode:12; /* protection */ |
3782 | + unsigned int uid:8; /* index into uid table */ |
3783 | + unsigned int guid:8; /* index into guid table */ |
3784 | + unsigned short symlink_size; |
3785 | + char symlink[0]; |
3786 | +} __attribute__ ((packed)); |
3787 | + |
3788 | +struct squashfs_reg_inode_header_2 { |
3789 | + unsigned int inode_type:4; |
3790 | + unsigned int mode:12; /* protection */ |
3791 | + unsigned int uid:8; /* index into uid table */ |
3792 | + unsigned int guid:8; /* index into guid table */ |
3793 | + unsigned int mtime; |
3794 | + unsigned int start_block; |
3795 | + unsigned int fragment; |
3796 | + unsigned int offset; |
3797 | + unsigned int file_size:32; |
3798 | + unsigned short block_list[0]; |
3799 | +} __attribute__ ((packed)); |
3800 | + |
3801 | +struct squashfs_dir_inode_header_2 { |
3802 | + unsigned int inode_type:4; |
3803 | + unsigned int mode:12; /* protection */ |
3804 | + unsigned int uid:8; /* index into uid table */ |
3805 | + unsigned int guid:8; /* index into guid table */ |
3806 | + unsigned int file_size:19; |
3807 | + unsigned int offset:13; |
3808 | + unsigned int mtime; |
3809 | + unsigned int start_block:24; |
3810 | +} __attribute__ ((packed)); |
3811 | + |
3812 | +struct squashfs_ldir_inode_header_2 { |
3813 | + unsigned int inode_type:4; |
3814 | + unsigned int mode:12; /* protection */ |
3815 | + unsigned int uid:8; /* index into uid table */ |
3816 | + unsigned int guid:8; /* index into guid table */ |
3817 | + unsigned int file_size:27; |
3818 | + unsigned int offset:13; |
3819 | + unsigned int mtime; |
3820 | + unsigned int start_block:24; |
3821 | + unsigned int i_count:16; |
3822 | + struct squashfs_dir_index_2 index[0]; |
3823 | +} __attribute__ ((packed)); |
3824 | + |
3825 | +union squashfs_inode_header_2 { |
3826 | + struct squashfs_base_inode_header_2 base; |
3827 | + struct squashfs_dev_inode_header_2 dev; |
3828 | + struct squashfs_symlink_inode_header_2 symlink; |
3829 | + struct squashfs_reg_inode_header_2 reg; |
3830 | + struct squashfs_dir_inode_header_2 dir; |
3831 | + struct squashfs_ldir_inode_header_2 ldir; |
3832 | + struct squashfs_ipc_inode_header_2 ipc; |
3833 | +}; |
3834 | + |
3835 | +struct squashfs_dir_header_2 { |
3836 | + unsigned int count:8; |
3837 | + unsigned int start_block:24; |
3838 | +} __attribute__ ((packed)); |
3839 | + |
3840 | +struct squashfs_dir_entry_2 { |
3841 | + unsigned int offset:13; |
3842 | + unsigned int type:3; |
3843 | + unsigned int size:8; |
3844 | + char name[0]; |
3845 | +} __attribute__ ((packed)); |
3846 | + |
3847 | +struct squashfs_fragment_entry_2 { |
3848 | + unsigned int start_block; |
3849 | + unsigned int size; |
3850 | +} __attribute__ ((packed)); |
3851 | + |
3852 | +#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\ |
3853 | + SQUASHFS_MEMSET(s, d, n);\ |
3854 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ |
3855 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ |
3856 | + SQUASHFS_SWAP((s)->uid, d, 16, 8);\ |
3857 | + SQUASHFS_SWAP((s)->guid, d, 24, 8);\ |
3858 | + |
3859 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\ |
3860 | + SQUASHFS_SWAP_START\ |
3861 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\ |
3862 | +} |
3863 | + |
3864 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \ |
3865 | + SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2)) |
3866 | + |
3867 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\ |
3868 | + SQUASHFS_SWAP_START\ |
3869 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ |
3870 | + sizeof(struct squashfs_dev_inode_header_2)); \ |
3871 | + SQUASHFS_SWAP((s)->rdev, d, 32, 16);\ |
3872 | +} |
3873 | + |
3874 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\ |
3875 | + SQUASHFS_SWAP_START\ |
3876 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ |
3877 | + sizeof(struct squashfs_symlink_inode_header_2));\ |
3878 | + SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\ |
3879 | +} |
3880 | + |
3881 | +#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\ |
3882 | + SQUASHFS_SWAP_START\ |
3883 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ |
3884 | + sizeof(struct squashfs_reg_inode_header_2));\ |
3885 | + SQUASHFS_SWAP((s)->mtime, d, 32, 32);\ |
3886 | + SQUASHFS_SWAP((s)->start_block, d, 64, 32);\ |
3887 | + SQUASHFS_SWAP((s)->fragment, d, 96, 32);\ |
3888 | + SQUASHFS_SWAP((s)->offset, d, 128, 32);\ |
3889 | + SQUASHFS_SWAP((s)->file_size, d, 160, 32);\ |
3890 | +} |
3891 | + |
3892 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\ |
3893 | + SQUASHFS_SWAP_START\ |
3894 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ |
3895 | + sizeof(struct squashfs_dir_inode_header_2));\ |
3896 | + SQUASHFS_SWAP((s)->file_size, d, 32, 19);\ |
3897 | + SQUASHFS_SWAP((s)->offset, d, 51, 13);\ |
3898 | + SQUASHFS_SWAP((s)->mtime, d, 64, 32);\ |
3899 | + SQUASHFS_SWAP((s)->start_block, d, 96, 24);\ |
3900 | +} |
3901 | + |
3902 | +#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\ |
3903 | + SQUASHFS_SWAP_START\ |
3904 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ |
3905 | + sizeof(struct squashfs_ldir_inode_header_2));\ |
3906 | + SQUASHFS_SWAP((s)->file_size, d, 32, 27);\ |
3907 | + SQUASHFS_SWAP((s)->offset, d, 59, 13);\ |
3908 | + SQUASHFS_SWAP((s)->mtime, d, 72, 32);\ |
3909 | + SQUASHFS_SWAP((s)->start_block, d, 104, 24);\ |
3910 | + SQUASHFS_SWAP((s)->i_count, d, 128, 16);\ |
3911 | +} |
3912 | + |
3913 | +#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\ |
3914 | + SQUASHFS_SWAP_START\ |
3915 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\ |
3916 | + SQUASHFS_SWAP((s)->index, d, 0, 27);\ |
3917 | + SQUASHFS_SWAP((s)->start_block, d, 27, 29);\ |
3918 | + SQUASHFS_SWAP((s)->size, d, 56, 8);\ |
3919 | +} |
3920 | +#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\ |
3921 | + SQUASHFS_SWAP_START\ |
3922 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\ |
3923 | + SQUASHFS_SWAP((s)->count, d, 0, 8);\ |
3924 | + SQUASHFS_SWAP((s)->start_block, d, 8, 24);\ |
3925 | +} |
3926 | + |
3927 | +#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\ |
3928 | + SQUASHFS_SWAP_START\ |
3929 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\ |
3930 | + SQUASHFS_SWAP((s)->offset, d, 0, 13);\ |
3931 | + SQUASHFS_SWAP((s)->type, d, 13, 3);\ |
3932 | + SQUASHFS_SWAP((s)->size, d, 16, 8);\ |
3933 | +} |
3934 | + |
3935 | +#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\ |
3936 | + SQUASHFS_SWAP_START\ |
3937 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\ |
3938 | + SQUASHFS_SWAP((s)->start_block, d, 0, 32);\ |
3939 | + SQUASHFS_SWAP((s)->size, d, 32, 32);\ |
3940 | +} |
3941 | + |
3942 | +#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n) |
3943 | + |
3944 | +/* fragment and fragment table defines */ |
3945 | +#define SQUASHFS_FRAGMENT_BYTES_2(A) (A * sizeof(struct squashfs_fragment_entry_2)) |
3946 | + |
3947 | +#define SQUASHFS_FRAGMENT_INDEX_2(A) (SQUASHFS_FRAGMENT_BYTES_2(A) / \ |
3948 | + SQUASHFS_METADATA_SIZE) |
3949 | + |
3950 | +#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A) (SQUASHFS_FRAGMENT_BYTES_2(A) % \ |
3951 | + SQUASHFS_METADATA_SIZE) |
3952 | + |
3953 | +#define SQUASHFS_FRAGMENT_INDEXES_2(A) ((SQUASHFS_FRAGMENT_BYTES_2(A) + \ |
3954 | + SQUASHFS_METADATA_SIZE - 1) / \ |
3955 | + SQUASHFS_METADATA_SIZE) |
3956 | + |
3957 | +#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A) (SQUASHFS_FRAGMENT_INDEXES_2(A) *\ |
3958 | + sizeof(int)) |
3959 | + |
3960 | +#endif |
3961 | + |
3962 | +#ifdef __KERNEL__ |
3963 | + |
3964 | +/* |
3965 | + * macros used to swap each structure entry, taking into account |
3966 | + * bitfields and different bitfield placing conventions on differing |
3967 | + * architectures |
3968 | + */ |
3969 | + |
3970 | +#include <asm/byteorder.h> |
3971 | + |
3972 | +#ifdef __BIG_ENDIAN |
3973 | + /* convert from little endian to big endian */ |
3974 | +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \ |
3975 | + tbits, b_pos) |
3976 | +#else |
3977 | + /* convert from big endian to little endian */ |
3978 | +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \ |
3979 | + tbits, 64 - tbits - b_pos) |
3980 | +#endif |
3981 | + |
3982 | +#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\ |
3983 | + b_pos = pos % 8;\ |
3984 | + val = 0;\ |
3985 | + s = (unsigned char *)p + (pos / 8);\ |
3986 | + d = ((unsigned char *) &val) + 7;\ |
3987 | + for(bits = 0; bits < (tbits + b_pos); bits += 8) \ |
3988 | + *d-- = *s++;\ |
3989 | + value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\ |
3990 | +} |
3991 | + |
3992 | +#define SQUASHFS_MEMSET(s, d, n) memset(s, 0, n); |
3993 | + |
3994 | +#endif |
3995 | +#endif |
3996 | diff --new-file -urp linux-2.6.15/include/linux/squashfs_fs_i.h linux-2.6.15-squashfs3.0/include/linux/squashfs_fs_i.h |
3997 | --- linux-2.6.15/include/linux/squashfs_fs_i.h 1970-01-01 01:00:00.000000000 +0100 |
3998 | +++ linux-2.6.15-squashfs3.0/include/linux/squashfs_fs_i.h 2006-03-07 21:12:37.000000000 +0000 |
3999 | @@ -0,0 +1,45 @@ |
4000 | +#ifndef SQUASHFS_FS_I |
4001 | +#define SQUASHFS_FS_I |
4002 | +/* |
4003 | + * Squashfs |
4004 | + * |
4005 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006 |
4006 | + * Phillip Lougher <phillip@lougher.org.uk> |
4007 | + * |
4008 | + * This program is free software; you can redistribute it and/or |
4009 | + * modify it under the terms of the GNU General Public License |
4010 | + * as published by the Free Software Foundation; either version 2, |
4011 | + * or (at your option) any later version. |
4012 | + * |
4013 | + * This program is distributed in the hope that it will be useful, |
4014 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
4015 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
4016 | + * GNU General Public License for more details. |
4017 | + * |
4018 | + * You should have received a copy of the GNU General Public License |
4019 | + * along with this program; if not, write to the Free Software |
4020 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
4021 | + * |
4022 | + * squashfs_fs_i.h |
4023 | + */ |
4024 | + |
4025 | +struct squashfs_inode_info { |
4026 | + long long start_block; |
4027 | + unsigned int offset; |
4028 | + union { |
4029 | + struct { |
4030 | + long long fragment_start_block; |
4031 | + unsigned int fragment_size; |
4032 | + unsigned int fragment_offset; |
4033 | + long long block_list_start; |
4034 | + } s1; |
4035 | + struct { |
4036 | + long long directory_index_start; |
4037 | + unsigned int directory_index_offset; |
4038 | + unsigned int directory_index_count; |
4039 | + unsigned int parent_inode; |
4040 | + } s2; |
4041 | + } u; |
4042 | + struct inode vfs_inode; |
4043 | +}; |
4044 | +#endif |
4045 | diff --new-file -urp linux-2.6.15/include/linux/squashfs_fs_sb.h linux-2.6.15-squashfs3.0/include/linux/squashfs_fs_sb.h |
4046 | --- linux-2.6.15/include/linux/squashfs_fs_sb.h 1970-01-01 01:00:00.000000000 +0100 |
4047 | +++ linux-2.6.15-squashfs3.0/include/linux/squashfs_fs_sb.h 2006-03-07 21:12:37.000000000 +0000 |
4048 | @@ -0,0 +1,74 @@ |
4049 | +#ifndef SQUASHFS_FS_SB |
4050 | +#define SQUASHFS_FS_SB |
4051 | +/* |
4052 | + * Squashfs |
4053 | + * |
4054 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006 |
4055 | + * Phillip Lougher <phillip@lougher.org.uk> |
4056 | + * |
4057 | + * This program is free software; you can redistribute it and/or |
4058 | + * modify it under the terms of the GNU General Public License |
4059 | + * as published by the Free Software Foundation; either version 2, |
4060 | + * or (at your option) any later version. |
4061 | + * |
4062 | + * This program is distributed in the hope that it will be useful, |
4063 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
4064 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
4065 | + * GNU General Public License for more details. |
4066 | + * |
4067 | + * You should have received a copy of the GNU General Public License |
4068 | + * along with this program; if not, write to the Free Software |
4069 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
4070 | + * |
4071 | + * squashfs_fs_sb.h |
4072 | + */ |
4073 | + |
4074 | +#include <linux/squashfs_fs.h> |
4075 | + |
4076 | +struct squashfs_cache { |
4077 | + long long block; |
4078 | + int length; |
4079 | + long long next_index; |
4080 | + char *data; |
4081 | +}; |
4082 | + |
4083 | +struct squashfs_fragment_cache { |
4084 | + long long block; |
4085 | + int length; |
4086 | + unsigned int locked; |
4087 | + char *data; |
4088 | +}; |
4089 | + |
4090 | +struct squashfs_sb_info { |
4091 | + struct squashfs_super_block sblk; |
4092 | + int devblksize; |
4093 | + int devblksize_log2; |
4094 | + int swap; |
4095 | + struct squashfs_cache *block_cache; |
4096 | + struct squashfs_fragment_cache *fragment; |
4097 | + int next_cache; |
4098 | + int next_fragment; |
4099 | + int next_meta_index; |
4100 | + unsigned int *uid; |
4101 | + unsigned int *guid; |
4102 | + long long *fragment_index; |
4103 | + unsigned int *fragment_index_2; |
4104 | + unsigned int read_size; |
4105 | + char *read_data; |
4106 | + char *read_page; |
4107 | + struct semaphore read_data_mutex; |
4108 | + struct semaphore read_page_mutex; |
4109 | + struct semaphore block_cache_mutex; |
4110 | + struct semaphore fragment_mutex; |
4111 | + struct semaphore meta_index_mutex; |
4112 | + wait_queue_head_t waitq; |
4113 | + wait_queue_head_t fragment_wait_queue; |
4114 | + struct meta_index *meta_index; |
4115 | + struct inode *(*iget)(struct super_block *s, squashfs_inode_t \ |
4116 | + inode); |
4117 | + long long (*read_blocklist)(struct inode *inode, int \ |
4118 | + index, int readahead_blks, char *block_list, \ |
4119 | + unsigned short **block_p, unsigned int *bsize); |
4120 | + int (*read_fragment_index_table)(struct super_block *s); |
4121 | +}; |
4122 | +#endif |
4123 | diff --new-file -urp linux-2.6.15/init/do_mounts_rd.c linux-2.6.15-squashfs3.0/init/do_mounts_rd.c |
4124 | --- linux-2.6.15/init/do_mounts_rd.c 2006-03-01 22:37:27.000000000 +0000 |
4125 | +++ linux-2.6.15-squashfs3.0/init/do_mounts_rd.c 2006-03-07 21:12:37.000000000 +0000 |
4126 | @@ -5,6 +5,7 @@ |
4127 | #include <linux/ext2_fs.h> |
4128 | #include <linux/romfs_fs.h> |
4129 | #include <linux/cramfs_fs.h> |
4130 | +#include <linux/squashfs_fs.h> |
4131 | #include <linux/initrd.h> |
4132 | #include <linux/string.h> |
4133 | |
4134 | @@ -39,6 +40,7 @@ static int __init crd_load(int in_fd, in |
4135 | * numbers could not be found. |
4136 | * |
4137 | * We currently check for the following magic numbers: |
4138 | + * squashfs |
4139 | * minix |
4140 | * ext2 |
4141 | * romfs |
4142 | @@ -53,6 +55,7 @@ identify_ramdisk_image(int fd, int start |
4143 | struct ext2_super_block *ext2sb; |
4144 | struct romfs_super_block *romfsb; |
4145 | struct cramfs_super *cramfsb; |
4146 | + struct squashfs_super_block *squashfsb; |
4147 | int nblocks = -1; |
4148 | unsigned char *buf; |
4149 | |
4150 | @@ -64,6 +67,7 @@ identify_ramdisk_image(int fd, int start |
4151 | ext2sb = (struct ext2_super_block *) buf; |
4152 | romfsb = (struct romfs_super_block *) buf; |
4153 | cramfsb = (struct cramfs_super *) buf; |
4154 | + squashfsb = (struct squashfs_super_block *) buf; |
4155 | memset(buf, 0xe5, size); |
4156 | |
4157 | /* |
4158 | @@ -101,6 +105,15 @@ identify_ramdisk_image(int fd, int start |
4159 | goto done; |
4160 | } |
4161 | |
4162 | + /* squashfs is at block zero too */ |
4163 | + if (squashfsb->s_magic == SQUASHFS_MAGIC) { |
4164 | + printk(KERN_NOTICE |
4165 | + "RAMDISK: squashfs filesystem found at block %d\n", |
4166 | + start_block); |
4167 | + nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; |
4168 | + goto done; |
4169 | + } |
4170 | + |
4171 | /* |
4172 | * Read block 1 to test for minix and ext2 superblock |
4173 | */ |