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    • /[magellan-source]/trunk/mkinitrd-magellan/busybox/e2fsprogs/old_e2fsprogs/ext2fs/ext2_io.h

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

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 3185 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    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
    13 #ifndef _EXT2FS_EXT2_IO_H
    14 #define _EXT2FS_EXT2_IO_H
    15
    16 /*
    17 * ext2_loff_t is defined here since unix_io.c needs it.
    18 */
    19 #if defined(__GNUC__) || defined(HAS_LONG_LONG)
    20 typedef long long ext2_loff_t;
    21 #else
    22 typedef long ext2_loff_t;
    23 #endif
    24
    25 /* llseek.c */
    26 /* ext2_loff_t ext2fs_llseek (int, ext2_loff_t, int); */
    27 #ifdef CONFIG_LFS
    28 # define ext2fs_llseek lseek64
    29 #else
    30 # define ext2fs_llseek lseek
    31 #endif
    32
    33 typedef struct struct_io_manager *io_manager;
    34 typedef struct struct_io_channel *io_channel;
    35
    36 #define CHANNEL_FLAGS_WRITETHROUGH 0x01
    37
    38 struct struct_io_channel {
    39 errcode_t magic;
    40 io_manager manager;
    41 char *name;
    42 int block_size;
    43 errcode_t (*read_error)(io_channel channel,
    44 unsigned long block,
    45 int count,
    46 void *data,
    47 size_t size,
    48 int actual_bytes_read,
    49 errcode_t error);
    50 errcode_t (*write_error)(io_channel channel,
    51 unsigned long block,
    52 int count,
    53 const void *data,
    54 size_t size,
    55 int actual_bytes_written,
    56 errcode_t error);
    57 int refcount;
    58 int flags;
    59 int reserved[14];
    60 void *private_data;
    61 void *app_data;
    62 };
    63
    64 struct struct_io_manager {
    65 errcode_t magic;
    66 const char *name;
    67 errcode_t (*open)(const char *name, int flags, io_channel *channel);
    68 errcode_t (*close)(io_channel channel);
    69 errcode_t (*set_blksize)(io_channel channel, int blksize);
    70 errcode_t (*read_blk)(io_channel channel, unsigned long block,
    71 int count, void *data);
    72 errcode_t (*write_blk)(io_channel channel, unsigned long block,
    73 int count, const void *data);
    74 errcode_t (*flush)(io_channel channel);
    75 errcode_t (*write_byte)(io_channel channel, unsigned long offset,
    76 int count, const void *data);
    77 errcode_t (*set_option)(io_channel channel, const char *option,
    78 const char *arg);
    79 int reserved[14];
    80 };
    81
    82 #define IO_FLAG_RW 1
    83
    84 /*
    85 * Convenience functions....
    86 */
    87 #define io_channel_close(c) ((c)->manager->close((c)))
    88 #define io_channel_set_blksize(c,s) ((c)->manager->set_blksize((c),s))
    89 #define io_channel_read_blk(c,b,n,d) ((c)->manager->read_blk((c),b,n,d))
    90 #define io_channel_write_blk(c,b,n,d) ((c)->manager->write_blk((c),b,n,d))
    91 #define io_channel_flush(c) ((c)->manager->flush((c)))
    92 #define io_channel_bumpcount(c) ((c)->refcount++)
    93
    94 /* io_manager.c */
    95 extern errcode_t io_channel_set_options(io_channel channel,
    96 const char *options);
    97 extern errcode_t io_channel_write_byte(io_channel channel,
    98 unsigned long offset,
    99 int count, const void *data);
    100
    101 /* unix_io.c */
    102 extern io_manager unix_io_manager;
    103
    104 /* test_io.c */
    105 extern io_manager test_io_manager, test_io_backing_manager;
    106 extern void (*test_io_cb_read_blk)
    107 (unsigned long block, int count, errcode_t err);
    108 extern void (*test_io_cb_write_blk)
    109 (unsigned long block, int count, errcode_t err);
    110 extern void (*test_io_cb_set_blksize)
    111 (int blksize, errcode_t err);
    112
    113 #endif /* _EXT2FS_EXT2_IO_H */
    114