1997-04-26 17:21:57 +04:00
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/*
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* io.h --- the I/O manager abstraction
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*
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1997-04-29 20:17:09 +04:00
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* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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1997-04-26 17:21:57 +04:00
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*/
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1998-02-17 01:00:37 +03:00
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#ifndef _EXT2FS_EXT2_IO_H
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#define _EXT2FS_EXT2_IO_H
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1997-04-26 17:34:30 +04:00
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/*
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* ext2_loff_t is defined here since unix_io.c needs it.
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*/
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#if defined(__GNUC__) || defined(HAS_LONG_LONG)
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typedef long long ext2_loff_t;
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#else
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typedef long ext2_loff_t;
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#endif
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/* llseek.c */
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ChangeLog, .del-io.h~72680822, irel_ma.c, llseek.c, rw_bitmaps.c:
io.h: Change the prototype of ext2fs_llseek() to use int's instead of
unsigned int's.
llseek.c: Change to allow PIC and !HAVE_LLSEEK. Add a prototype to
make life easer for GNU Libc 2.
rw_bitmaps.c: On the PowerPC, the big-endian variant of the ext2
filesystem has its bitmaps stored as 32-bit words with bit 0 as the
LSB of each word. Thus a bitmap with only bit 0 set would be, as a
string of bytes, 00 00 00 01 00 ... To cope with this, we
byte-reverse each word of a bitmap if we have a big-endian filesystem,
that is, if we are *not* byte-swapping other word-sized numbers.
ChangeLog, expect.1, image.gz:
f_badinode: Modify test to check for "bad" character and block devices
(i.e., ones which contain garbage block entries)
1997-08-14 21:20:42 +04:00
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ext2_loff_t ext2fs_llseek (int, ext2_loff_t, int);
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1997-04-26 17:34:30 +04:00
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1997-04-26 17:21:57 +04:00
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typedef struct struct_io_manager *io_manager;
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typedef struct struct_io_channel *io_channel;
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struct struct_io_channel {
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Many files:
dosio.c: New file to do DOS/BIOS disk accesses.
namei.c (open_namei): Make pathlen be of type size_t.
llseek.c: Always #include stdlib.h since it's need to define
size_t.
io.h: Use errcode_t for magic numbers.
icount.c (get_icount_el), dupfs.c (ext2fs_dup_handle), dblist.c
(dir_block_cmp): Use size_t where appropriate.
read_bb.c (ext2fs_read_bb_inode), cmp_bitmaps.c
(ext2fs_compare_inode_bitmap): Use blk_t, ino_t and size_t
where appropriate.
closefs.c (ext2fs_flush): Use dgrp_t instead of int where
appropriate.
openfs.c (ext2fs_open), check_desc.c (ext2fs_check_desc): Use blk_t
instead of int where appropriate.
rw_bitmaps.c (read_bitmaps), irel_ma.c, inode.c (ext2fs_write_inode),
initialize.c (ext2fs_initialize): brel_ma.c: Fix to make be
16-bit safe.
link.c (ext2fs_link), unlink.c (ext2fs_unlink), lookup.c (lookup_proc),
ismounted.c (ext2fs_check_if_mounted), block.c (xlate_func):
Add #pragma argsused for Turbo C.
1997-08-12 00:29:22 +04:00
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errcode_t magic;
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1997-04-26 17:21:57 +04:00
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io_manager manager;
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char *name;
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int block_size;
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errcode_t (*read_error)(io_channel channel,
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unsigned long block,
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int count,
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void *data,
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size_t size,
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int actual_bytes_read,
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errcode_t error);
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errcode_t (*write_error)(io_channel channel,
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unsigned long block,
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int count,
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const void *data,
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size_t size,
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int actual_bytes_written,
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errcode_t error);
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1997-04-30 01:26:48 +04:00
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int refcount;
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int reserved[15];
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1997-04-26 17:21:57 +04:00
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void *private_data;
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1997-08-24 06:57:55 +04:00
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void *app_data;
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1997-04-26 17:21:57 +04:00
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};
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struct struct_io_manager {
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Many files:
dosio.c: New file to do DOS/BIOS disk accesses.
namei.c (open_namei): Make pathlen be of type size_t.
llseek.c: Always #include stdlib.h since it's need to define
size_t.
io.h: Use errcode_t for magic numbers.
icount.c (get_icount_el), dupfs.c (ext2fs_dup_handle), dblist.c
(dir_block_cmp): Use size_t where appropriate.
read_bb.c (ext2fs_read_bb_inode), cmp_bitmaps.c
(ext2fs_compare_inode_bitmap): Use blk_t, ino_t and size_t
where appropriate.
closefs.c (ext2fs_flush): Use dgrp_t instead of int where
appropriate.
openfs.c (ext2fs_open), check_desc.c (ext2fs_check_desc): Use blk_t
instead of int where appropriate.
rw_bitmaps.c (read_bitmaps), irel_ma.c, inode.c (ext2fs_write_inode),
initialize.c (ext2fs_initialize): brel_ma.c: Fix to make be
16-bit safe.
link.c (ext2fs_link), unlink.c (ext2fs_unlink), lookup.c (lookup_proc),
ismounted.c (ext2fs_check_if_mounted), block.c (xlate_func):
Add #pragma argsused for Turbo C.
1997-08-12 00:29:22 +04:00
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errcode_t magic;
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1997-04-26 17:21:57 +04:00
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const char *name;
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errcode_t (*open)(const char *name, int flags, io_channel *channel);
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errcode_t (*close)(io_channel channel);
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errcode_t (*set_blksize)(io_channel channel, int blksize);
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errcode_t (*read_blk)(io_channel channel, unsigned long block,
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int count, void *data);
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errcode_t (*write_blk)(io_channel channel, unsigned long block,
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int count, const void *data);
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errcode_t (*flush)(io_channel channel);
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1997-04-26 17:34:30 +04:00
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int reserved[16];
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1997-04-26 17:21:57 +04:00
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};
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#define IO_FLAG_RW 1
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/*
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* Convenience functions....
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*/
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#define io_channel_close(c) ((c)->manager->close((c)))
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#define io_channel_set_blksize(c,s) ((c)->manager->set_blksize((c),s))
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#define io_channel_read_blk(c,b,n,d) ((c)->manager->read_blk((c),b,n,d))
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#define io_channel_write_blk(c,b,n,d) ((c)->manager->write_blk((c),b,n,d))
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#define io_channel_flush(c) ((c)->manager->flush((c)))
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1997-04-30 01:26:48 +04:00
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#define io_channel_bumpcount(c) ((c)->refcount++)
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1997-04-26 17:21:57 +04:00
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1997-04-29 20:17:09 +04:00
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/* unix_io.c */
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1997-04-26 17:21:57 +04:00
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extern io_manager unix_io_manager;
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1997-04-29 20:17:09 +04:00
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/* test_io.c */
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extern io_manager test_io_manager, test_io_backing_manager;
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extern void (*test_io_cb_read_blk)
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(unsigned long block, int count, errcode_t err);
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extern void (*test_io_cb_write_blk)
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(unsigned long block, int count, errcode_t err);
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extern void (*test_io_cb_set_blksize)
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(int blksize, errcode_t err);
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1998-02-17 01:00:37 +03:00
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#endif /* _EXT2FS_EXT2_IO_H */
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