source: branches/stable/mindi-busybox/e2fsprogs/ext2fs/ext2_io.h @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.1 KB
Line 
1/*
2 * io.h --- the I/O manager abstraction
3 *
4 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#ifndef _EXT2FS_EXT2_IO_H
13#define _EXT2FS_EXT2_IO_H
14
15/*
16 * ext2_loff_t is defined here since unix_io.c needs it.
17 */
18#if defined(__GNUC__) || defined(HAS_LONG_LONG)
19typedef long long   ext2_loff_t;
20#else
21typedef 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
32typedef struct struct_io_manager *io_manager;
33typedef struct struct_io_channel *io_channel;
34
35#define CHANNEL_FLAGS_WRITETHROUGH  0x01
36
37struct 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
63struct 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 */
94extern errcode_t io_channel_set_options(io_channel channel,
95                    const char *options);
96extern errcode_t io_channel_write_byte(io_channel channel,
97                       unsigned long offset,
98                       int count, const void *data);
99
100/* unix_io.c */
101extern io_manager unix_io_manager;
102
103/* test_io.c */
104extern io_manager test_io_manager, test_io_backing_manager;
105extern void (*test_io_cb_read_blk)
106    (unsigned long block, int count, errcode_t err);
107extern void (*test_io_cb_write_blk)
108    (unsigned long block, int count, errcode_t err);
109extern void (*test_io_cb_set_blksize)
110    (int blksize, errcode_t err);
111
112#endif /* _EXT2FS_EXT2_IO_H */
113
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