1997-04-26 17:21:57 +04:00
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|
|
/*
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|
|
* unix_io.c --- This is the Unix I/O interface to the I/O manager.
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*
|
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|
|
* Implements a one-block write-through cache.
|
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*
|
1997-04-29 20:17:09 +04:00
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* Copyright (C) 1993, 1994, 1995 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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2000-05-26 03:31:54 +04:00
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|
|
#define _LARGEFILE_SOURCE
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|
|
#define _LARGEFILE64_SOURCE
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|
|
|
1997-04-26 17:21:57 +04:00
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|
|
#include <stdio.h>
|
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|
|
#include <string.h>
|
1997-08-11 03:07:40 +04:00
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|
|
#if HAVE_UNISTD_H
|
1997-04-26 17:21:57 +04:00
|
|
|
#include <unistd.h>
|
1997-08-11 03:07:40 +04:00
|
|
|
#endif
|
1998-02-20 08:33:14 +03:00
|
|
|
#if HAVE_ERRNO_H
|
|
|
|
#include <errno.h>
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|
|
|
#endif
|
1997-04-26 17:21:57 +04:00
|
|
|
#include <fcntl.h>
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|
|
#include <time.h>
|
1997-10-20 03:00:21 +04:00
|
|
|
#if HAVE_SYS_STAT_H
|
1997-04-26 17:21:57 +04:00
|
|
|
#include <sys/stat.h>
|
1997-10-20 03:00:21 +04:00
|
|
|
#endif
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|
|
|
#if HAVE_SYS_TYPES_H
|
1997-04-26 17:21:57 +04:00
|
|
|
#include <sys/types.h>
|
1997-10-20 03:00:21 +04:00
|
|
|
#endif
|
1997-04-26 17:21:57 +04:00
|
|
|
|
Many files:
inode.c (ext2fs_open_inode_scan): Initialize the group variables
so that we don't need to call get_next_blockgroup() the first
time around. Saves a bit of time, and prevents us from
needing to assign -1 to current_group (which is an unsigned
value).
icount.c (insert_icount_el): Cast the estimated number of inodes
from a float to an ino_t.
alloc.c, alloc_tables.c, badlbocks.c, bb_compat.c, bb_inode.c,
bitmaps.c, bitops.c, block.c, bmap.c, bmove.c, brel_ma.c,
check_desc.c, closefs.c, cmp_bitmaps.c, dblist.c,
dblist_dir.c, dir_iterate.c, dirblock.c, dupfs.c, expanddir.c,
ext2fs.h, fileio.c, freefs.c, get_pathname.c, getsize.c,
icount.c, initialize.c, inline.c, inode.c, irel_ma.c,
ismounted.c, link.c, lookup.c, mkdir.c, namei.c, native.c,
newdir.c, openfs.c, read_bb.c, read_bb_file.c, rs_bitmap.c,
rw_bitmaps.c, swapfs.c, test_io.c, tst_badblocks.c,
tst_getsize.c, tst_iscan.c, unix_io.c, unlink.c, valid_blk.c,
version.c: If EXT2_FLAT_INCLUDES is defined, then assume all
of the ext2-specific header files are in a flat directory.
block.c, bmove.c, dirblock.c, fileio.c: Explicitly cast
all assignments from void * to be compatible with C++.
closefs.c (ext2fs_flush): Add a call to io_channel_flush() to
make sure the contents of the disk are flushed to disk.
dblist.c (ext2fs_add_dir_block): Change new to be new_entry to
avoid C++ namespace clash.
bitmaps.c (ext2fs_copy_bitmap): Change new to be new_map to
avoid C++ namespace clash.
ext2fs.h, bb_inode.c, block.c, bmove.c, brel.h, brel_ma.c,
irel.h, irel_ma.c, dblist.c, dblist_dir.c, dir_iterate.c,
ext2fsP.h, expanddir.c, get_pathname.c, inode.c, link.c,
unlink.c: Change private to be priv_data (to avoid C++
namespace clash)
1998-01-19 17:47:53 +03:00
|
|
|
#if EXT2_FLAT_INCLUDES
|
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|
|
#include "ext2_fs.h"
|
|
|
|
#else
|
1997-10-26 06:41:24 +03:00
|
|
|
#include <linux/ext2_fs.h>
|
Many files:
inode.c (ext2fs_open_inode_scan): Initialize the group variables
so that we don't need to call get_next_blockgroup() the first
time around. Saves a bit of time, and prevents us from
needing to assign -1 to current_group (which is an unsigned
value).
icount.c (insert_icount_el): Cast the estimated number of inodes
from a float to an ino_t.
alloc.c, alloc_tables.c, badlbocks.c, bb_compat.c, bb_inode.c,
bitmaps.c, bitops.c, block.c, bmap.c, bmove.c, brel_ma.c,
check_desc.c, closefs.c, cmp_bitmaps.c, dblist.c,
dblist_dir.c, dir_iterate.c, dirblock.c, dupfs.c, expanddir.c,
ext2fs.h, fileio.c, freefs.c, get_pathname.c, getsize.c,
icount.c, initialize.c, inline.c, inode.c, irel_ma.c,
ismounted.c, link.c, lookup.c, mkdir.c, namei.c, native.c,
newdir.c, openfs.c, read_bb.c, read_bb_file.c, rs_bitmap.c,
rw_bitmaps.c, swapfs.c, test_io.c, tst_badblocks.c,
tst_getsize.c, tst_iscan.c, unix_io.c, unlink.c, valid_blk.c,
version.c: If EXT2_FLAT_INCLUDES is defined, then assume all
of the ext2-specific header files are in a flat directory.
block.c, bmove.c, dirblock.c, fileio.c: Explicitly cast
all assignments from void * to be compatible with C++.
closefs.c (ext2fs_flush): Add a call to io_channel_flush() to
make sure the contents of the disk are flushed to disk.
dblist.c (ext2fs_add_dir_block): Change new to be new_entry to
avoid C++ namespace clash.
bitmaps.c (ext2fs_copy_bitmap): Change new to be new_map to
avoid C++ namespace clash.
ext2fs.h, bb_inode.c, block.c, bmove.c, brel.h, brel_ma.c,
irel.h, irel_ma.c, dblist.c, dblist_dir.c, dir_iterate.c,
ext2fsP.h, expanddir.c, get_pathname.c, inode.c, link.c,
unlink.c: Change private to be priv_data (to avoid C++
namespace clash)
1998-01-19 17:47:53 +03:00
|
|
|
#endif
|
1997-10-26 06:41:24 +03:00
|
|
|
|
|
|
|
#include "ext2fs.h"
|
1997-04-26 17:21:57 +04:00
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
/*
|
|
|
|
* For checking structure magic numbers...
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define EXT2_CHECK_MAGIC(struct, code) \
|
|
|
|
if ((struct)->magic != (code)) return (code)
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
struct unix_private_data {
|
1997-04-26 17:34:30 +04:00
|
|
|
int magic;
|
1997-04-26 17:21:57 +04:00
|
|
|
int dev;
|
|
|
|
int flags;
|
|
|
|
char *buf;
|
|
|
|
int buf_block_nr;
|
|
|
|
};
|
|
|
|
|
|
|
|
static errcode_t unix_open(const char *name, int flags, io_channel *channel);
|
|
|
|
static errcode_t unix_close(io_channel channel);
|
|
|
|
static errcode_t unix_set_blksize(io_channel channel, int blksize);
|
|
|
|
static errcode_t unix_read_blk(io_channel channel, unsigned long block,
|
|
|
|
int count, void *data);
|
|
|
|
static errcode_t unix_write_blk(io_channel channel, unsigned long block,
|
|
|
|
int count, const void *data);
|
|
|
|
static errcode_t unix_flush(io_channel channel);
|
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
static struct struct_io_manager struct_unix_manager = {
|
|
|
|
EXT2_ET_MAGIC_IO_MANAGER,
|
1997-04-26 17:21:57 +04:00
|
|
|
"Unix I/O Manager",
|
|
|
|
unix_open,
|
|
|
|
unix_close,
|
|
|
|
unix_set_blksize,
|
|
|
|
unix_read_blk,
|
|
|
|
unix_write_blk,
|
|
|
|
unix_flush
|
|
|
|
};
|
|
|
|
|
|
|
|
io_manager unix_io_manager = &struct_unix_manager;
|
|
|
|
|
|
|
|
static errcode_t unix_open(const char *name, int flags, io_channel *channel)
|
|
|
|
{
|
|
|
|
io_channel io = NULL;
|
|
|
|
struct unix_private_data *data = NULL;
|
|
|
|
errcode_t retval;
|
2000-05-26 03:31:54 +04:00
|
|
|
int open_flags;
|
1997-04-26 17:21:57 +04:00
|
|
|
|
1997-04-26 17:58:21 +04:00
|
|
|
if (name == 0)
|
|
|
|
return EXT2_ET_BAD_DEVICE_NAME;
|
1997-10-26 06:41:24 +03:00
|
|
|
retval = ext2fs_get_mem(sizeof(struct struct_io_channel),
|
|
|
|
(void **) &io);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
1997-04-26 17:34:30 +04:00
|
|
|
memset(io, 0, sizeof(struct struct_io_channel));
|
|
|
|
io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
|
1997-10-26 06:41:24 +03:00
|
|
|
retval = ext2fs_get_mem(sizeof(struct unix_private_data),
|
|
|
|
(void **) &data);
|
|
|
|
if (retval)
|
1997-04-26 17:21:57 +04:00
|
|
|
goto cleanup;
|
1997-10-26 06:41:24 +03:00
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
io->manager = unix_io_manager;
|
1997-10-26 06:41:24 +03:00
|
|
|
retval = ext2fs_get_mem(strlen(name)+1, (void **) &io->name);
|
|
|
|
if (retval)
|
1997-04-26 17:21:57 +04:00
|
|
|
goto cleanup;
|
1997-10-26 06:41:24 +03:00
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
strcpy(io->name, name);
|
|
|
|
io->private_data = data;
|
1997-04-26 17:34:30 +04:00
|
|
|
io->block_size = 1024;
|
|
|
|
io->read_error = 0;
|
|
|
|
io->write_error = 0;
|
1997-04-30 01:26:48 +04:00
|
|
|
io->refcount = 1;
|
1997-04-26 17:21:57 +04:00
|
|
|
|
|
|
|
memset(data, 0, sizeof(struct unix_private_data));
|
1997-04-26 17:34:30 +04:00
|
|
|
data->magic = EXT2_ET_MAGIC_UNIX_IO_CHANNEL;
|
1997-10-26 06:41:24 +03:00
|
|
|
retval = ext2fs_get_mem(io->block_size, (void **) &data->buf);
|
1997-04-26 17:21:57 +04:00
|
|
|
data->buf_block_nr = -1;
|
1997-10-26 06:41:24 +03:00
|
|
|
if (retval)
|
1997-04-26 17:21:57 +04:00
|
|
|
goto cleanup;
|
1997-10-26 06:41:24 +03:00
|
|
|
|
2000-05-26 03:31:54 +04:00
|
|
|
open_flags = (flags & IO_FLAG_RW) ? O_RDWR : O_RDONLY;
|
|
|
|
#ifdef HAVE_OPEN64
|
|
|
|
data->dev = open64(name, open_flags);
|
|
|
|
#else
|
|
|
|
data->dev = open(name, open_flags);
|
|
|
|
#endif
|
1997-04-26 17:21:57 +04:00
|
|
|
if (data->dev < 0) {
|
|
|
|
retval = errno;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
*channel = io;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
cleanup:
|
|
|
|
if (io)
|
1997-10-26 06:41:24 +03:00
|
|
|
ext2fs_free_mem((void **) &io);
|
1997-04-26 17:21:57 +04:00
|
|
|
if (data) {
|
|
|
|
if (data->buf)
|
1997-10-26 06:41:24 +03:00
|
|
|
ext2fs_free_mem((void **) &data->buf);
|
|
|
|
ext2fs_free_mem((void **) &data);
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t unix_close(io_channel channel)
|
|
|
|
{
|
|
|
|
struct unix_private_data *data;
|
|
|
|
errcode_t retval = 0;
|
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
1997-04-26 17:21:57 +04:00
|
|
|
data = (struct unix_private_data *) channel->private_data;
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
|
1997-04-30 01:26:48 +04:00
|
|
|
|
|
|
|
if (--channel->refcount > 0)
|
|
|
|
return 0;
|
1997-04-26 17:34:30 +04:00
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (close(data->dev) < 0)
|
|
|
|
retval = errno;
|
|
|
|
if (data->buf)
|
1997-10-26 06:41:24 +03:00
|
|
|
ext2fs_free_mem((void **) &data->buf);
|
1997-04-26 17:21:57 +04:00
|
|
|
if (channel->private_data)
|
1997-10-26 06:41:24 +03:00
|
|
|
ext2fs_free_mem((void **) &channel->private_data);
|
1997-04-26 17:21:57 +04:00
|
|
|
if (channel->name)
|
1997-10-26 06:41:24 +03:00
|
|
|
ext2fs_free_mem((void **) &channel->name);
|
|
|
|
ext2fs_free_mem((void **) &channel);
|
1997-04-26 17:21:57 +04:00
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t unix_set_blksize(io_channel channel, int blksize)
|
|
|
|
{
|
|
|
|
struct unix_private_data *data;
|
1997-10-26 06:41:24 +03:00
|
|
|
errcode_t retval;
|
1997-04-26 17:21:57 +04:00
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
1997-04-26 17:21:57 +04:00
|
|
|
data = (struct unix_private_data *) channel->private_data;
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (channel->block_size != blksize) {
|
|
|
|
channel->block_size = blksize;
|
1997-10-26 06:41:24 +03:00
|
|
|
ext2fs_free_mem((void **) &data->buf);
|
|
|
|
retval = ext2fs_get_mem(blksize, (void **) &data->buf);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
1997-04-26 17:21:57 +04:00
|
|
|
data->buf_block_nr = -1;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static errcode_t unix_read_blk(io_channel channel, unsigned long block,
|
|
|
|
int count, void *buf)
|
|
|
|
{
|
|
|
|
struct unix_private_data *data;
|
|
|
|
errcode_t retval;
|
|
|
|
size_t size;
|
1997-04-26 17:34:30 +04:00
|
|
|
ext2_loff_t location;
|
1997-04-26 17:21:57 +04:00
|
|
|
int actual = 0;
|
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
1997-04-26 17:21:57 +04:00
|
|
|
data = (struct unix_private_data *) channel->private_data;
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
|
1997-04-26 17:21:57 +04:00
|
|
|
|
|
|
|
/*
|
|
|
|
* If it's in the cache, use it!
|
|
|
|
*/
|
|
|
|
if ((count == 1) && (block == data->buf_block_nr)) {
|
|
|
|
memcpy(buf, data->buf, channel->block_size);
|
|
|
|
return 0;
|
|
|
|
}
|
1997-04-26 17:34:30 +04:00
|
|
|
#if 0
|
|
|
|
printf("read_block %lu (%d)\n", block, count);
|
|
|
|
#endif
|
1997-04-26 17:21:57 +04:00
|
|
|
size = (count < 0) ? -count : count * channel->block_size;
|
1997-04-26 17:34:30 +04:00
|
|
|
location = (ext2_loff_t) block * channel->block_size;
|
1997-04-29 20:17:09 +04:00
|
|
|
if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
|
Many files:
dblist.c (ext2fs_get_num_dirs): Make ext2fs_get_num_dirs more paranoid
about validating the directory counts from the block group
information.
all files: Don't include stdlib.h anymore; include it in ext2_fs.h,
since that file requires stdlib.h
ChangeLog, Makefile.in, dirinfo.c:
dirinfo.c (e2fsck_add_dir_info): Use ext2fs_get_num_dirs instead of
e2fsck_get_num_dirs, which has been removed.
Makefile.in (PROGS): Remove @EXTRA_PROGS@, since we don't want to
compile and install flushb.
ChangeLog, configure.in:
Remove @EXTRA_PROGS@, since we aren't using it in 2fsck/Makefile.in anymore
ChangeLog, Makefile.in:
Install debugfs in /sbin, instead of /usr/sbin.
libext2fs.texinfo:
Update version string to be 1.12
Makefile.in:
Fix bug in find script which made the exclusion list, where a '-' was
missing from an -name option.
1997-12-01 21:24:10 +03:00
|
|
|
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
|
1997-04-26 17:21:57 +04:00
|
|
|
goto error_out;
|
|
|
|
}
|
|
|
|
actual = read(data->dev, buf, size);
|
|
|
|
if (actual != size) {
|
|
|
|
if (actual < 0)
|
|
|
|
actual = 0;
|
|
|
|
retval = EXT2_ET_SHORT_READ;
|
|
|
|
goto error_out;
|
|
|
|
}
|
|
|
|
if (count == 1) {
|
|
|
|
data->buf_block_nr = block;
|
|
|
|
memcpy(data->buf, buf, size); /* Update the cache */
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_out:
|
|
|
|
memset((char *) buf+actual, 0, size-actual);
|
|
|
|
if (channel->read_error)
|
|
|
|
retval = (channel->read_error)(channel, block, count, buf,
|
|
|
|
size, actual, retval);
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t unix_write_blk(io_channel channel, unsigned long block,
|
|
|
|
int count, const void *buf)
|
|
|
|
{
|
|
|
|
struct unix_private_data *data;
|
|
|
|
size_t size;
|
1997-04-26 17:34:30 +04:00
|
|
|
ext2_loff_t location;
|
1997-04-26 17:21:57 +04:00
|
|
|
int actual = 0;
|
|
|
|
errcode_t retval;
|
|
|
|
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
1997-04-26 17:21:57 +04:00
|
|
|
data = (struct unix_private_data *) channel->private_data;
|
1997-04-26 17:34:30 +04:00
|
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
|
1997-04-26 17:21:57 +04:00
|
|
|
|
|
|
|
if (count == 1)
|
|
|
|
size = channel->block_size;
|
|
|
|
else {
|
|
|
|
data->buf_block_nr = -1; /* Invalidate the cache */
|
|
|
|
if (count < 0)
|
|
|
|
size = -count;
|
|
|
|
else
|
|
|
|
size = count * channel->block_size;
|
|
|
|
}
|
1997-04-26 17:34:30 +04:00
|
|
|
|
|
|
|
location = (ext2_loff_t) block * channel->block_size;
|
1997-04-29 20:17:09 +04:00
|
|
|
if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
|
Many files:
dblist.c (ext2fs_get_num_dirs): Make ext2fs_get_num_dirs more paranoid
about validating the directory counts from the block group
information.
all files: Don't include stdlib.h anymore; include it in ext2_fs.h,
since that file requires stdlib.h
ChangeLog, Makefile.in, dirinfo.c:
dirinfo.c (e2fsck_add_dir_info): Use ext2fs_get_num_dirs instead of
e2fsck_get_num_dirs, which has been removed.
Makefile.in (PROGS): Remove @EXTRA_PROGS@, since we don't want to
compile and install flushb.
ChangeLog, configure.in:
Remove @EXTRA_PROGS@, since we aren't using it in 2fsck/Makefile.in anymore
ChangeLog, Makefile.in:
Install debugfs in /sbin, instead of /usr/sbin.
libext2fs.texinfo:
Update version string to be 1.12
Makefile.in:
Fix bug in find script which made the exclusion list, where a '-' was
missing from an -name option.
1997-12-01 21:24:10 +03:00
|
|
|
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
|
1997-04-26 17:21:57 +04:00
|
|
|
goto error_out;
|
|
|
|
}
|
|
|
|
|
|
|
|
actual = write(data->dev, buf, size);
|
|
|
|
if (actual != size) {
|
|
|
|
retval = EXT2_ET_SHORT_WRITE;
|
|
|
|
goto error_out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((count == 1) && (block == data->buf_block_nr))
|
|
|
|
memcpy(data->buf, buf, size); /* Update the cache */
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_out:
|
|
|
|
if (channel->write_error)
|
|
|
|
retval = (channel->write_error)(channel, block, count, buf,
|
|
|
|
size, actual, retval);
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
1997-06-14 11:25:40 +04:00
|
|
|
* Flush data buffers to disk.
|
1997-04-26 17:21:57 +04:00
|
|
|
*/
|
|
|
|
static errcode_t unix_flush(io_channel channel)
|
|
|
|
{
|
1997-04-26 17:34:30 +04:00
|
|
|
struct unix_private_data *data;
|
|
|
|
|
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
|
|
|
data = (struct unix_private_data *) channel->private_data;
|
|
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
|
|
|
|
|
1997-06-14 11:25:40 +04:00
|
|
|
fsync(data->dev);
|
1997-04-26 17:21:57 +04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|