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/*
* e2undo.c - Replay an undo log onto an ext2/3/4 filesystem
*
* Copyright IBM Corporation, 2007
* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <fcntl.h>
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include "ext2fs/tdb.h"
#include "ext2fs/ext2fs.h"
#include "nls-enable.h"
unsigned char mtime_key[] = "filesystem MTIME";
unsigned char uuid_key[] = "filesystem UUID";
unsigned char blksize_key[] = "filesystem BLKSIZE";
char *prg_name;
static void usage(char *prg_name)
{
fprintf(stderr,
_("Usage: %s <transaction file> <filesystem>\n"), prg_name);
exit(1);
}
static int check_filesystem(TDB_CONTEXT *tdb, io_channel channel)
{
__u32 s_mtime;
__u8 s_uuid[16];
errcode_t retval;
TDB_DATA tdb_key, tdb_data;
struct ext2_super_block super;
io_channel_set_blksize(channel, SUPERBLOCK_OFFSET);
retval = io_channel_read_blk(channel, 1, -SUPERBLOCK_SIZE, &super);
if (retval) {
com_err(prg_name,
retval, _("Failed to read the file system data \n"));
return retval;
}
tdb_key.dptr = mtime_key;
tdb_key.dsize = sizeof(mtime_key);
tdb_data = tdb_fetch(tdb, tdb_key);
if (!tdb_data.dptr) {
retval = EXT2_ET_TDB_SUCCESS + tdb_error(tdb);
com_err(prg_name, retval,
_("Failed tdb_fetch %s\n"), tdb_errorstr(tdb));
return retval;
}
s_mtime = *(__u32 *)tdb_data.dptr;
if (super.s_mtime != s_mtime) {
com_err(prg_name, 0,
_("The file system Mount time didn't match %u\n"),
s_mtime);
return -1;
}
tdb_key.dptr = uuid_key;
tdb_key.dsize = sizeof(uuid_key);
tdb_data = tdb_fetch(tdb, tdb_key);
if (!tdb_data.dptr) {
retval = EXT2_ET_TDB_SUCCESS + tdb_error(tdb);
com_err(prg_name, retval,
_("Failed tdb_fetch %s\n"), tdb_errorstr(tdb));
return retval;
}
memcpy(s_uuid, tdb_data.dptr, sizeof(s_uuid));
if (memcmp(s_uuid, super.s_uuid, sizeof(s_uuid))) {
com_err(prg_name, 0,
_("The file system UUID didn't match \n"));
return -1;
}
return 0;
}
static int set_blk_size(TDB_CONTEXT *tdb, io_channel channel)
{
int block_size;
errcode_t retval;
TDB_DATA tdb_key, tdb_data;
tdb_key.dptr = blksize_key;
tdb_key.dsize = sizeof(blksize_key);
tdb_data = tdb_fetch(tdb, tdb_key);
if (!tdb_data.dptr) {
retval = EXT2_ET_TDB_SUCCESS + tdb_error(tdb);
com_err(prg_name, retval,
_("Failed tdb_fetch %s\n"), tdb_errorstr(tdb));
return retval;
}
block_size = *(int *)tdb_data.dptr;
#ifdef DEBUG
printf("Block size %d\n", block_size);
#endif
io_channel_set_blksize(channel, block_size);
return 0;
}
int main(int argc, char *argv[])
{
int c,force = 0;
TDB_CONTEXT *tdb;
TDB_DATA key, data;
io_channel channel;
errcode_t retval;
int mount_flags;
unsigned long blk_num;
char *device_name, *tdb_file;
io_manager manager = unix_io_manager;
#ifdef ENABLE_NLS
setlocale(LC_MESSAGES, "");
setlocale(LC_CTYPE, "");
bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
textdomain(NLS_CAT_NAME);
#endif
add_error_table(&et_ext2_error_table);
prg_name = argv[0];
while((c = getopt(argc, argv, "f")) != EOF) {
switch (c) {
case 'f':
force = 1;
break;
default:
usage(prg_name);
}
}
if (argc != optind+2)
usage(prg_name);
tdb_file = argv[optind];
device_name = argv[optind+1];
tdb = tdb_open(tdb_file, 0, 0, O_RDONLY, 0600);
if (!tdb) {
com_err(prg_name, errno,
_("Failed tdb_open %s\n"), tdb_file);
exit(1);
}
retval = ext2fs_check_if_mounted(device_name, &mount_flags);
if (retval) {
com_err(prg_name, retval, _("Error while determining whether "
"%s is mounted.\n"), device_name);
exit(1);
}
if (mount_flags & EXT2_MF_MOUNTED) {
com_err(prg_name, retval, _("e2undo should only be run on "
"unmounted file system\n"));
exit(1);
}
retval = manager->open(device_name,
IO_FLAG_EXCLUSIVE | IO_FLAG_RW, &channel);
if (retval) {
com_err(prg_name, retval,
_("Failed to open %s\n"), device_name);
exit(1);
}
if (!force && check_filesystem(tdb, channel)) {
exit(1);
}
if (set_blk_size(tdb, channel)) {
exit(1);
}
for (key = tdb_firstkey(tdb); key.dptr; key = tdb_nextkey(tdb, key)) {
if (!strcmp((char *) key.dptr, (char *) mtime_key) ||
!strcmp((char *) key.dptr, (char *) uuid_key) ||
!strcmp((char *) key.dptr, (char *) blksize_key)) {
continue;
}
data = tdb_fetch(tdb, key);
if (!data.dptr) {
com_err(prg_name, 0,
_("Failed tdb_fetch %s\n"), tdb_errorstr(tdb));
exit(1);
}
blk_num = *(unsigned long *)key.dptr;
printf(_("Replayed transaction of size %zd at location %ld\n"),
data.dsize, blk_num);
retval = io_channel_write_blk(channel, blk_num,
-data.dsize, data.dptr);
if (retval == -1) {
com_err(prg_name, retval,
_("Failed write %s\n"),
strerror(errno));
exit(1);
}
}
io_channel_close(channel);
tdb_close(tdb);
return 0;
}
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