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    Contents of /trunk/mkinitrd-magellan/busybox/e2fsprogs/old_e2fsprogs/ext2fs/ext2_io.h

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 3159 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * io.h --- the I/O manager abstraction
    4 *
    5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
    6 *
    7 * %Begin-Header%
    8 * This file may be redistributed under the terms of the GNU Public
    9 * License.
    10 * %End-Header%
    11 */
    12 #ifndef EXT2FS_EXT2_IO_H
    13 #define EXT2FS_EXT2_IO_H 1
    14
    15 /*
    16 * ext2_loff_t is defined here since unix_io.c needs it.
    17 */
    18 #if defined(__GNUC__) || defined(HAS_LONG_LONG)
    19 typedef long long ext2_loff_t;
    20 #else
    21 typedef long ext2_loff_t;
    22 #endif
    23
    24 /* llseek.c */
    25 /* ext2_loff_t ext2fs_llseek (int, ext2_loff_t, int); */
    26 #ifdef CONFIG_LFS
    27 # define ext2fs_llseek lseek64
    28 #else
    29 # define ext2fs_llseek lseek
    30 #endif
    31
    32 typedef struct struct_io_manager *io_manager;
    33 typedef struct struct_io_channel *io_channel;
    34
    35 #define CHANNEL_FLAGS_WRITETHROUGH 0x01
    36
    37 struct struct_io_channel {
    38 errcode_t magic;
    39 io_manager manager;
    40 char *name;
    41 int block_size;
    42 errcode_t (*read_error)(io_channel channel,
    43 unsigned long block,
    44 int count,
    45 void *data,
    46 size_t size,
    47 int actual_bytes_read,
    48 errcode_t error);
    49 errcode_t (*write_error)(io_channel channel,
    50 unsigned long block,
    51 int count,
    52 const void *data,
    53 size_t size,
    54 int actual_bytes_written,
    55 errcode_t error);
    56 int refcount;
    57 int flags;
    58 int reserved[14];
    59 void *private_data;
    60 void *app_data;
    61 };
    62
    63 struct struct_io_manager {
    64 errcode_t magic;
    65 const char *name;
    66 errcode_t (*open)(const char *name, int flags, io_channel *channel);
    67 errcode_t (*close)(io_channel channel);
    68 errcode_t (*set_blksize)(io_channel channel, int blksize);
    69 errcode_t (*read_blk)(io_channel channel, unsigned long block,
    70 int count, void *data);
    71 errcode_t (*write_blk)(io_channel channel, unsigned long block,
    72 int count, const void *data);
    73 errcode_t (*flush)(io_channel channel);
    74 errcode_t (*write_byte)(io_channel channel, unsigned long offset,
    75 int count, const void *data);
    76 errcode_t (*set_option)(io_channel channel, const char *option,
    77 const char *arg);
    78 int reserved[14];
    79 };
    80
    81 #define IO_FLAG_RW 1
    82
    83 /*
    84 * Convenience functions....
    85 */
    86 #define io_channel_close(c) ((c)->manager->close((c)))
    87 #define io_channel_set_blksize(c,s) ((c)->manager->set_blksize((c),s))
    88 #define io_channel_read_blk(c,b,n,d) ((c)->manager->read_blk((c),b,n,d))
    89 #define io_channel_write_blk(c,b,n,d) ((c)->manager->write_blk((c),b,n,d))
    90 #define io_channel_flush(c) ((c)->manager->flush((c)))
    91 #define io_channel_bumpcount(c) ((c)->refcount++)
    92
    93 /* io_manager.c */
    94 extern errcode_t io_channel_set_options(io_channel channel,
    95 const char *options);
    96 extern errcode_t io_channel_write_byte(io_channel channel,
    97 unsigned long offset,
    98 int count, const void *data);
    99
    100 /* unix_io.c */
    101 extern io_manager unix_io_manager;
    102
    103 /* test_io.c */
    104 extern io_manager test_io_manager, test_io_backing_manager;
    105 extern void (*test_io_cb_read_blk)
    106 (unsigned long block, int count, errcode_t err);
    107 extern void (*test_io_cb_write_blk)
    108 (unsigned long block, int count, errcode_t err);
    109 extern void (*test_io_cb_set_blksize)
    110 (int blksize, errcode_t err);
    111
    112 #endif