1997-04-26 17:21:57 +04:00
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/*
|
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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>
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1997-08-11 03:07:40 +04:00
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#if HAVE_UNISTD_H
|
1997-04-26 17:21:57 +04:00
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#include <unistd.h>
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1997-08-11 03:07:40 +04:00
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|
#endif
|
1998-02-20 08:33:14 +03:00
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|
|
#if HAVE_ERRNO_H
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|
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#include <errno.h>
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|
|
#endif
|
1997-04-26 17:21:57 +04:00
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#include <fcntl.h>
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#include <time.h>
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1997-10-20 03:00:21 +04:00
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|
|
#if HAVE_SYS_STAT_H
|
1997-04-26 17:21:57 +04:00
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|
#include <sys/stat.h>
|
1997-10-20 03:00:21 +04:00
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|
|
#endif
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|
|
#if HAVE_SYS_TYPES_H
|
1997-04-26 17:21:57 +04:00
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|
#include <sys/types.h>
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1997-10-20 03:00:21 +04:00
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|
#endif
|
2001-11-27 05:05:36 +03:00
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#include <sys/resource.h>
|
1997-04-26 17:21:57 +04:00
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|
|
|
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
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#include "ext2_fs.h"
|
1997-10-26 06:41:24 +03:00
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#include "ext2fs.h"
|
1997-04-26 17:21:57 +04:00
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|
1997-04-26 17:34:30 +04:00
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|
|
/*
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|
|
* For checking structure magic numbers...
|
|
|
|
*/
|
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|
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#define EXT2_CHECK_MAGIC(struct, code) \
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|
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if ((struct)->magic != (code)) return (code)
|
2000-10-18 23:22:24 +04:00
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|
|
struct unix_cache {
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|
|
char *buf;
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|
|
unsigned long block;
|
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|
|
int access_time;
|
|
|
|
int dirty:1;
|
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|
|
int in_use:1;
|
|
|
|
};
|
|
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|
|
|
#define CACHE_SIZE 8
|
|
|
|
#define WRITE_VIA_CACHE_SIZE 4 /* Must be smaller than CACHE_SIZE */
|
|
|
|
|
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;
|
2000-10-18 23:22:24 +04:00
|
|
|
int access_time;
|
|
|
|
struct unix_cache cache[CACHE_SIZE];
|
1997-04-26 17:21:57 +04:00
|
|
|
};
|
|
|
|
|
|
|
|
static errcode_t unix_open(const char *name, int flags, io_channel *channel);
|
|
|
|
static errcode_t unix_close(io_channel channel);
|
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|
|
static errcode_t unix_set_blksize(io_channel channel, int blksize);
|
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|
|
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);
|
2000-10-27 00:24:43 +04:00
|
|
|
static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
|
|
|
|
int size, const void *data);
|
1997-04-26 17:21:57 +04:00
|
|
|
|
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",
|
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|
|
unix_open,
|
|
|
|
unix_close,
|
|
|
|
unix_set_blksize,
|
|
|
|
unix_read_blk,
|
|
|
|
unix_write_blk,
|
2000-10-27 00:24:43 +04:00
|
|
|
unix_flush,
|
|
|
|
unix_write_byte
|
1997-04-26 17:21:57 +04:00
|
|
|
};
|
|
|
|
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|
|
io_manager unix_io_manager = &struct_unix_manager;
|
|
|
|
|
2000-10-18 23:22:24 +04:00
|
|
|
/*
|
|
|
|
* Here are the raw I/O functions
|
|
|
|
*/
|
|
|
|
static errcode_t raw_read_blk(io_channel channel,
|
|
|
|
struct unix_private_data *data,
|
|
|
|
unsigned long block,
|
|
|
|
int count, void *buf)
|
|
|
|
{
|
|
|
|
errcode_t retval;
|
|
|
|
size_t size;
|
|
|
|
ext2_loff_t location;
|
|
|
|
int actual = 0;
|
|
|
|
|
|
|
|
size = (count < 0) ? -count : count * channel->block_size;
|
|
|
|
location = (ext2_loff_t) block * channel->block_size;
|
|
|
|
if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
|
|
|
|
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
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 raw_write_blk(io_channel channel,
|
|
|
|
struct unix_private_data *data,
|
|
|
|
unsigned long block,
|
|
|
|
int count, const void *buf)
|
|
|
|
{
|
|
|
|
size_t size;
|
|
|
|
ext2_loff_t location;
|
|
|
|
int actual = 0;
|
|
|
|
errcode_t retval;
|
|
|
|
|
|
|
|
if (count == 1)
|
|
|
|
size = channel->block_size;
|
|
|
|
else {
|
|
|
|
if (count < 0)
|
|
|
|
size = -count;
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|
|
else
|
|
|
|
size = count * channel->block_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
location = (ext2_loff_t) block * channel->block_size;
|
|
|
|
if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
|
|
|
|
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
|
|
|
|
goto error_out;
|
|
|
|
}
|
|
|
|
|
|
|
|
actual = write(data->dev, buf, size);
|
|
|
|
if (actual != size) {
|
|
|
|
retval = EXT2_ET_SHORT_WRITE;
|
|
|
|
goto error_out;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_out:
|
|
|
|
if (channel->write_error)
|
|
|
|
retval = (channel->write_error)(channel, block, count, buf,
|
|
|
|
size, actual, retval);
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Here we implement the cache functions
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Allocate the cache buffers */
|
|
|
|
static errcode_t alloc_cache(io_channel channel,
|
|
|
|
struct unix_private_data *data)
|
|
|
|
{
|
|
|
|
errcode_t retval;
|
|
|
|
struct unix_cache *cache;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
data->access_time = 0;
|
|
|
|
for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) {
|
|
|
|
cache->block = 0;
|
|
|
|
cache->access_time = 0;
|
|
|
|
cache->dirty = 0;
|
|
|
|
cache->in_use = 0;
|
|
|
|
if ((retval = ext2fs_get_mem(channel->block_size,
|
|
|
|
(void **) &cache->buf)))
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Free the cache buffers */
|
|
|
|
static void free_cache(io_channel channel,
|
|
|
|
struct unix_private_data *data)
|
|
|
|
{
|
|
|
|
struct unix_cache *cache;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
data->access_time = 0;
|
|
|
|
for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) {
|
|
|
|
cache->block = 0;
|
|
|
|
cache->access_time = 0;
|
|
|
|
cache->dirty = 0;
|
|
|
|
cache->in_use = 0;
|
|
|
|
if (cache->buf)
|
|
|
|
ext2fs_free_mem((void **) &cache->buf);
|
|
|
|
cache->buf = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Try to find a block in the cache. If get_cache is non-zero, then
|
|
|
|
* if the block isn't in the cache, evict the oldest block in the
|
|
|
|
* cache and create a new cache entry for the requested block.
|
|
|
|
*/
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
static struct unix_cache *find_cached_block(io_channel channel,
|
|
|
|
struct unix_private_data *data,
|
|
|
|
unsigned long block,
|
|
|
|
int get_cache)
|
2000-10-18 23:22:24 +04:00
|
|
|
{
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
struct unix_cache *cache, *unused_cache, *oldest_cache;
|
2000-10-18 23:22:24 +04:00
|
|
|
int i;
|
|
|
|
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
unused_cache = oldest_cache = 0;
|
2000-10-18 23:22:24 +04:00
|
|
|
for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) {
|
|
|
|
if (!cache->in_use) {
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
unused_cache = cache;
|
2000-10-18 23:22:24 +04:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (cache->block == block) {
|
|
|
|
cache->access_time = ++data->access_time;
|
|
|
|
return cache;
|
|
|
|
}
|
|
|
|
if (!oldest_cache ||
|
|
|
|
(cache->access_time < oldest_cache->access_time))
|
|
|
|
oldest_cache = cache;
|
|
|
|
}
|
|
|
|
if (!get_cache)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Try to allocate cache slot.
|
|
|
|
*/
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
if (unused_cache)
|
|
|
|
cache = unused_cache;
|
2000-10-18 23:22:24 +04:00
|
|
|
else {
|
|
|
|
cache = oldest_cache;
|
|
|
|
if (cache->dirty)
|
|
|
|
raw_write_blk(channel, data,
|
|
|
|
cache->block, 1, cache->buf);
|
|
|
|
}
|
|
|
|
cache->in_use = 1;
|
|
|
|
cache->block = block;
|
|
|
|
cache->access_time = ++data->access_time;
|
|
|
|
return cache;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Flush all of the blocks in the cache
|
|
|
|
*/
|
|
|
|
static errcode_t flush_cached_blocks(io_channel channel,
|
|
|
|
struct unix_private_data *data,
|
|
|
|
int invalidate)
|
|
|
|
|
|
|
|
{
|
|
|
|
struct unix_cache *cache;
|
|
|
|
errcode_t retval, retval2;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
retval2 = 0;
|
|
|
|
for (i=0, cache = data->cache; i < CACHE_SIZE; i++, cache++) {
|
|
|
|
if (!cache->in_use)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (invalidate)
|
|
|
|
cache->in_use = 0;
|
|
|
|
|
|
|
|
if (!cache->dirty)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
retval = raw_write_blk(channel, data,
|
|
|
|
cache->block, 1, cache->buf);
|
|
|
|
if (retval)
|
|
|
|
retval2 = retval;
|
|
|
|
else
|
|
|
|
cache->dirty = 0;
|
|
|
|
}
|
|
|
|
return retval2;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
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;
|
2001-11-27 05:05:36 +03:00
|
|
|
struct stat st;
|
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
|
|
|
|
2000-10-18 23:22:24 +04:00
|
|
|
if ((retval = alloc_cache(io, data)))
|
|
|
|
goto cleanup;
|
|
|
|
|
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;
|
|
|
|
}
|
2001-11-27 05:05:36 +03:00
|
|
|
/*
|
|
|
|
* Work around a bug in 2.4.10+ kernels where writes to block
|
|
|
|
* devices are wrongly getting hit by the filesize limit.
|
|
|
|
*/
|
|
|
|
if ((flags & IO_FLAG_RW) &&
|
|
|
|
(fstat(data->dev, &st) == 0) &&
|
|
|
|
(S_ISBLK(st.st_mode))) {
|
|
|
|
struct rlimit rlim;
|
|
|
|
|
2001-12-03 07:47:32 +03:00
|
|
|
rlim.rlim_cur = rlim.rlim_max = ((unsigned long)(~0UL));
|
2001-11-27 05:05:36 +03:00
|
|
|
setrlimit(RLIMIT_FSIZE, &rlim);
|
|
|
|
getrlimit(RLIMIT_FSIZE, &rlim);
|
2001-12-03 07:47:32 +03:00
|
|
|
if (((unsigned long) rlim.rlim_cur) <
|
|
|
|
((unsigned long) rlim.rlim_max)) {
|
2001-11-27 05:05:36 +03:00
|
|
|
rlim.rlim_cur = rlim.rlim_max;
|
|
|
|
setrlimit(RLIMIT_FSIZE, &rlim);
|
|
|
|
}
|
|
|
|
}
|
1997-04-26 17:21:57 +04:00
|
|
|
*channel = io;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
cleanup:
|
|
|
|
if (data) {
|
2000-10-18 23:22:24 +04:00
|
|
|
free_cache(io, data);
|
1997-10-26 06:41:24 +03:00
|
|
|
ext2fs_free_mem((void **) &data);
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
2000-10-18 23:22:24 +04:00
|
|
|
if (io)
|
|
|
|
ext2fs_free_mem((void **) &io);
|
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;
|
2000-10-18 23:22:24 +04:00
|
|
|
|
|
|
|
retval = flush_cached_blocks(channel, data, 0);
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
if (close(data->dev) < 0)
|
|
|
|
retval = errno;
|
2000-10-18 23:22:24 +04:00
|
|
|
free_cache(channel, data);
|
2002-02-20 09:06:25 +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) {
|
2000-10-18 23:22:24 +04:00
|
|
|
if ((retval = flush_cached_blocks(channel, data, 0)))
|
|
|
|
return retval;
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
channel->block_size = blksize;
|
2000-10-18 23:22:24 +04:00
|
|
|
free_cache(channel, data);
|
|
|
|
if ((retval = alloc_cache(channel, data)))
|
1997-10-26 06:41:24 +03:00
|
|
|
return retval;
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static errcode_t unix_read_blk(io_channel channel, unsigned long block,
|
|
|
|
int count, void *buf)
|
|
|
|
{
|
|
|
|
struct unix_private_data *data;
|
2000-10-18 23:22:24 +04:00
|
|
|
struct unix_cache *cache;
|
1997-04-26 17:21:57 +04:00
|
|
|
errcode_t retval;
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
char *cp;
|
2000-10-18 23:22:24 +04:00
|
|
|
int i, j;
|
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
|
|
|
|
|
|
|
/*
|
2000-10-18 23:22:24 +04:00
|
|
|
* If we're doing an odd-sized read, flush out the cache and
|
|
|
|
* then do a direct read.
|
1997-04-26 17:21:57 +04:00
|
|
|
*/
|
2000-10-18 23:22:24 +04:00
|
|
|
if (count < 0) {
|
|
|
|
if ((retval = flush_cached_blocks(channel, data, 0)))
|
|
|
|
return retval;
|
|
|
|
return raw_read_blk(channel, data, block, count, buf);
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
2000-10-18 23:22:24 +04:00
|
|
|
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
cp = buf;
|
2000-10-18 23:22:24 +04:00
|
|
|
while (count > 0) {
|
|
|
|
/* If it's in the cache, use it! */
|
|
|
|
if ((cache = find_cached_block(channel, data, block, 0))) {
|
|
|
|
#ifdef DEBUG
|
|
|
|
printf("Using cached block %d\n", block);
|
1997-04-26 17:34:30 +04:00
|
|
|
#endif
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
memcpy(cp, cache->buf, channel->block_size);
|
2000-10-18 23:22:24 +04:00
|
|
|
count--;
|
|
|
|
block++;
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
cp += channel->block_size;
|
2000-10-18 23:22:24 +04:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Find the number of uncached blocks so we can do a
|
|
|
|
* single read request
|
|
|
|
*/
|
|
|
|
for (i=1; i < count; i++)
|
|
|
|
if (find_cached_block(channel, data, block+i, 0))
|
|
|
|
break;
|
|
|
|
#ifdef DEBUG
|
|
|
|
printf("Reading %d blocks starting at %d\n", i, block);
|
|
|
|
#endif
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
if ((retval = raw_read_blk(channel, data, block, i, cp)))
|
2000-10-18 23:22:24 +04:00
|
|
|
return retval;
|
|
|
|
|
|
|
|
/* Save the results in the cache */
|
|
|
|
for (j=0; j < i; j++) {
|
|
|
|
count--;
|
|
|
|
cache = find_cached_block(channel, data, block++, 1);
|
|
|
|
if (cache)
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
memcpy(cache->buf, cp, channel->block_size);
|
|
|
|
cp += channel->block_size;
|
2000-10-18 23:22:24 +04:00
|
|
|
}
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static errcode_t unix_write_blk(io_channel channel, unsigned long block,
|
|
|
|
int count, const void *buf)
|
|
|
|
{
|
|
|
|
struct unix_private_data *data;
|
2000-10-18 23:22:24 +04:00
|
|
|
struct unix_cache *cache;
|
|
|
|
errcode_t retval = 0, retval2;
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
const char *cp;
|
|
|
|
int writethrough;
|
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
|
|
|
|
2000-10-18 23:22:24 +04:00
|
|
|
/*
|
|
|
|
* If we're doing an odd-sized write or a very large write,
|
|
|
|
* flush out the cache completely and then do a direct write.
|
|
|
|
*/
|
|
|
|
if (count < 0 || count > WRITE_VIA_CACHE_SIZE) {
|
|
|
|
if ((retval = flush_cached_blocks(channel, data, 1)))
|
|
|
|
return retval;
|
|
|
|
return raw_write_blk(channel, data, block, count, buf);
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
|
|
|
|
2000-10-18 23:22:24 +04:00
|
|
|
/*
|
|
|
|
* For a moderate-sized multi-block write, first force a write
|
|
|
|
* if we're in write-through cache mode, and then fill the
|
|
|
|
* cache with the blocks.
|
|
|
|
*/
|
|
|
|
writethrough = channel->flags & CHANNEL_FLAGS_WRITETHROUGH;
|
|
|
|
if (writethrough)
|
|
|
|
retval = raw_write_blk(channel, data, block, count, buf);
|
1997-04-26 17:21:57 +04:00
|
|
|
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
cp = buf;
|
2000-10-18 23:22:24 +04:00
|
|
|
while (count > 0) {
|
|
|
|
cache = find_cached_block(channel, data, block, 1);
|
|
|
|
if (!cache) {
|
|
|
|
/*
|
|
|
|
* Oh shit, we couldn't get cache descriptor.
|
|
|
|
* Force the write directly.
|
|
|
|
*/
|
|
|
|
if ((retval2 = raw_write_blk(channel, data, block,
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
1, cp)))
|
2000-10-18 23:22:24 +04:00
|
|
|
retval = retval2;
|
|
|
|
} else {
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
memcpy(cache->buf, cp, channel->block_size);
|
2000-10-18 23:22:24 +04:00
|
|
|
cache->dirty = !writethrough;
|
|
|
|
}
|
|
|
|
count--;
|
|
|
|
block++;
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
cp += channel->block_size;
|
2000-10-18 23:22:24 +04:00
|
|
|
}
|
1997-04-26 17:21:57 +04:00
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2000-10-27 00:24:43 +04:00
|
|
|
static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
|
|
|
|
int size, const void *buf)
|
|
|
|
{
|
|
|
|
struct unix_private_data *data;
|
Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
errcode_t retval = 0;
|
2000-10-27 00:24:43 +04:00
|
|
|
size_t actual;
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Flush out the cache completely
|
|
|
|
*/
|
|
|
|
if ((retval = flush_cached_blocks(channel, data, 1)))
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
if (lseek(data->dev, offset, SEEK_SET) < 0)
|
|
|
|
return errno;
|
|
|
|
|
|
|
|
actual = write(data->dev, buf, size);
|
|
|
|
if (actual != size)
|
|
|
|
return EXT2_ET_SHORT_WRITE;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
1997-04-26 17:21:57 +04:00
|
|
|
/*
|
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;
|
2000-10-18 23:22:24 +04:00
|
|
|
errcode_t retval = 0;
|
1997-04-26 17:34:30 +04:00
|
|
|
|
|
|
|
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);
|
2000-10-18 23:22:24 +04:00
|
|
|
|
|
|
|
retval = flush_cached_blocks(channel, data, 0);
|
1997-06-14 11:25:40 +04:00
|
|
|
fsync(data->dev);
|
2000-10-18 23:22:24 +04:00
|
|
|
return retval;
|
1997-04-26 17:21:57 +04:00
|
|
|
}
|
|
|
|
|