/*
* journal.c --- code for handling the "ext3" journal
*
* Copyright (C) 2000 Andreas Dilger
* Copyright (C) 2000 Theodore Ts'o
*
* Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie
* Copyright (C) 1999 Red Hat Software
*
* This file may be redistributed under the terms of the
* GNU General Public License version 2 or at your discretion
* any later version.
*/
#include "config.h"
#ifdef HAVE_SYS_MOUNT_H
#include <sys/param.h>
#include <sys/mount.h>
#define MNT_FL (MS_MGC_VAL | MS_RDONLY)
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#define E2FSCK_INCLUDE_INLINE_FUNCS
#include "uuid/uuid.h"
#include "journal.h"
#ifdef CONFIG_JBD_DEBUG /* Enabled by configure --enable-jfs-debug */
static int bh_count = 0;
#endif
#if EXT2_FLAT_INCLUDES
#include "blkid.h"
#else
#include "blkid/blkid.h"
#endif
/*
* Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
* This creates a larger static binary, and a smaller binary using
* shared libraries. It's also probably slightly less CPU-efficient,
* which is why it's not on by default. But, it's a good way of
* testing the functions in inode_io.c and fileio.c.
*/
#undef USE_INODE_IO
/* Checksumming functions */
static int ext2fs_journal_verify_csum_type(journal_t *j,
journal_superblock_t *jsb)
{
if (!journal_has_csum_v2or3(j))
return 1;
return jsb->s_checksum_type == JBD2_CRC32C_CHKSUM;
}
static __u32 ext2fs_journal_sb_csum(journal_superblock_t *jsb)
{
__u32 crc, old_crc;
old_crc = jsb->s_checksum;
jsb->s_checksum = 0;
crc = ext2fs_crc32c_le(~0, (unsigned char *)jsb,
sizeof(journal_superblock_t));
jsb->s_checksum = old_crc;
return crc;
}
static int ext2fs_journal_sb_csum_verify(journal_t *j,
journal_superblock_t *jsb)
{
__u32 provided, calculated;
if (!journal_has_csum_v2or3(j))
return 1;
provided = ext2fs_be32_to_cpu(jsb->s_checksum);
calculated = ext2fs_journal_sb_csum(jsb);
return provided == calculated;
}
static errcode_t ext2fs_journal_sb_csum_set(journal_t *j,
journal_superblock_t *jsb)
{
__u32 crc;
if (!journal_has_csum_v2or3(j))
return 0;
crc = ext2fs_journal_sb_csum(jsb);
jsb->s_checksum = ext2fs_cpu_to_be32(crc);
return 0;
}
/* Kernel compatibility functions for handling the journal. These allow us
* to use the recovery.c file virtually unchanged from the kernel, so we
* don't have to do much to keep kernel and user recovery in sync.
*/
int journal_bmap(journal_t *journal, blk64_t block, unsigned long long *phys)
{
#ifdef USE_INODE_IO
*phys = block;
return 0;
#else
struct inode *inode = journal->j_inode;
errcode_t retval;
blk64_t pblk;
if (!inode) {
*phys = block;
return 0;
}
retval = ext2fs_bmap2(inode->i_fs, inode->i_ino,
&inode->i_ext2, NULL, 0, block, 0, &pblk);
*phys = pblk;
return (int) retval;
#endif
}
struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize)
{
struct buffer_head *bh;
int bufsize = sizeof(*bh) + kdev->k_fs->blocksize -
sizeof(bh->b_data);
errcode_t retval;
retval = ext2fs_get_memzero(bufsize, &bh);
if (retval)
return NULL;
#ifdef CONFIG_JBD_DEBUG
if (journal_enable_debug >= 3)
bh_count++;
#endif
jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
(unsigned long long) blocknr, blocksize, bh_count);
bh->b_fs = kdev->k_fs;
if (kdev->k_dev == K_DEV_FS)
bh->b_io = kdev->k_fs->io;
else
bh->b_io = kdev->k_fs->journal_io;
bh->b_size = blocksize;
bh->b_blocknr = blocknr;
return bh;
}
int sync_blockdev(kdev_t kdev)
{
io_channel io;
if (kdev->k_dev == K_DEV_FS)
io = kdev->k_fs->io;
else
io = kdev->k_fs->journal_io;
return io_channel_flush(io) ? EIO : 0;
}
void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
{
errcode_t retval;
struct buffer_head *bh;
for (; nr > 0; --nr) {
bh = *bhp++;
if (rw == READ && !bh->b_uptodate) {
jfs_debug(3, "reading block %llu/%p\n",
bh->b_blocknr, (void *) bh);
retval = io_channel_read_blk64(bh->b_io,
bh->b_blocknr,
1, bh->b_data);
if (retval) {
com_err(bh->b_fs->device_name, retval,
"while reading block %llu\n",
bh->b_blocknr);
bh->b_err = (int) retval;
continue;
}
bh->b_uptodate = 1;
} else if (rw == WRITE && bh->b_dirty) {
jfs_debug(3, "writing block %llu/%p\n",
bh->b_blocknr,
(void *) bh);
retval = io_channel_write_blk64(bh->b_io,
bh->b_blocknr,
1, bh->b_data);
if (retval) {
com_err(bh->b_fs->device_name, retval,
"while writing block %llu\n",
bh->b_blocknr);
bh->b_err = (int) retval;
continue;
}
bh->b_dirty = 0;
bh->b_uptodate = 1;
} else {
jfs_debug(3, "no-op %s for block %llu\n",
rw == READ ? "read" : "write",
bh->b_blocknr);
}
}
}
void mark_buffer_dirty(struct buffer_head *bh)
{
bh->b_dirty = 1;
}
static void mark_buffer_clean(struct buffer_head *bh)
{
bh->b_dirty = 0;
}
void brelse(struct buffer_head *bh)
{
if (bh->b_dirty)
ll_rw_block(WRITE, 1, &bh);
jfs_debug(3, "freeing block %llu/%p (total %d)\n",
bh->b_blocknr, (void *) bh, --bh_count);
ext2fs_free_mem(&bh);
}
int buffer_uptodate(struct buffer_head *bh)
{
return bh->b_uptodate;
}
void mark_buffer_uptodate(struct buffer_head *bh, int val)
{
bh->b_uptodate = val;
}
void wait_on_buffer(struct buffer_head *bh)
{
if (!bh->b_uptodate)
ll_rw_block(READ, 1, &bh);
}
static void ext2fs_clear_recover(ext2_filsys fs, int error)
{
ext2fs_clear_feature_journal_needs_recovery(fs->super);
/* if we had an error doing journal recovery, we need a full fsck */
if (error)
fs->super->s_state &= ~EXT2_VALID_FS;
/*
* If we replayed the journal by definition the file system
* was mounted since the last time it was checked
*/
if (fs->super->s_lastcheck >= fs->super->s_mtime)
fs->super->s_lastcheck = fs->super->s_mtime - 1;
ext2fs_mark_super_dirty(fs);
}
/*
* This is a helper function to check the validity of the journal.
*/
struct process_block_struct {
e2_blkcnt_t last_block;
};
static int process_journal_block(ext2_filsys fs,
blk64_t *block_nr,
e2_blkcnt_t blockcnt,
blk64_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct process_block_struct *p;
blk64_t blk = *block_nr;
p = (struct process_block_struct *) priv_data;
if (!blk || blk < fs->super->s_first_data_block ||
blk >= ext2fs_blocks_count(fs->super))
return BLOCK_ABORT;
if (blockcnt >= 0)
p->last_block = blockcnt;
return 0;
}
static errcode_t ext2fs_get_journal(ext2_filsys fs, journal_t **ret_journal)
{
struct process_block_struct pb;
struct ext2_super_block *sb = fs->super;
struct ext2_super_block jsuper;
struct buffer_head *bh;
struct inode *j_inode = NULL;
struct kdev_s *dev_fs = NULL, *dev_journal;
const char *journal_name = 0;
journal_t *journal = NULL;
errcode_t retval = 0;
io_manager io_ptr = 0;
unsigned long long start = 0;
int ext_journal = 0;
int tried_backup_jnl = 0;
retval = ext2fs_get_memzero(sizeof(journal_t), &journal);
if (retval)
return retval;
retval = ext2fs_get_memzero(2 * sizeof(struct kdev_s), &dev_fs);
if (retval)
goto errout;
dev_journal = dev_fs+1;
dev_fs->k_fs = dev_journal->k_fs = fs;
dev_fs->k_dev = K_DEV_FS;
dev_journal->k_dev = K_DEV_JOURNAL;
journal->j_dev = dev_journal;
journal->j_fs_dev = dev_fs;
journal->j_inode = NULL;
journal->j_blocksize = fs->blocksize;
if (uuid_is_null(sb->s_journal_uuid)) {
if (!sb->s_journal_inum) {
retval = EXT2_ET_BAD_INODE_NUM;
goto errout;
}
retval = ext2fs_get_memzero(sizeof(*j_inode), &j_inode);
if (retval)
goto errout;
j_inode->i_fs = fs;
j_inode->i_ino = sb->s_journal_inum;
retval = ext2fs_read_inode(fs, sb->s_journal_inum,
&j_inode->i_ext2);
if (retval) {
try_backup_journal:
if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
tried_backup_jnl)
goto errout;
memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
EXT2_N_BLOCKS*4);
j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
j_inode->i_ext2.i_links_count = 1;
j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
tried_backup_jnl++;
}
if (!j_inode->i_ext2.i_links_count ||
!LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
retval = EXT2_ET_NO_JOURNAL;
goto try_backup_journal;
}
if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
JFS_MIN_JOURNAL_BLOCKS) {
retval = EXT2_ET_JOURNAL_TOO_SMALL;
goto try_backup_journal;
}
pb.last_block = -1;
retval = ext2fs_block_iterate3(fs, j_inode->i_ino,
BLOCK_FLAG_HOLE, 0,
process_journal_block, &pb);
if ((pb.last_block + 1) * fs->blocksize <
(int) EXT2_I_SIZE(&j_inode->i_ext2)) {
retval = EXT2_ET_JOURNAL_TOO_SMALL;
goto try_backup_journal;
}
if (tried_backup_jnl && (fs->flags & EXT2_FLAG_RW)) {
retval = ext2fs_write_inode(fs, sb->s_journal_inum,
&j_inode->i_ext2);
if (retval)
goto errout;
}
journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) /
journal->j_blocksize;
#ifdef USE_INODE_IO
retval = ext2fs_inode_io_intern2(fs, sb->s_journal_inum,
&j_inode->i_ext2,
&journal_name);
if (retval)
goto errout;
io_ptr = inode_io_manager;
#else
journal->j_inode = j_inode;
fs->journal_io = fs->io;
retval = (errcode_t)journal_bmap(journal, 0, &start);
if (retval)
goto errout;
#endif
} else {
ext_journal = 1;
if (!fs->journal_name) {
char uuid[37];
blkid_cache blkid;
blkid_get_cache(&blkid, NULL);
uuid_unparse(sb->s_journal_uuid, uuid);
fs->journal_name = blkid_get_devname(blkid,
"UUID", uuid);
if (!fs->journal_name)
fs->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
blkid_put_cache(blkid);
}
journal_name = fs->journal_name;
if (!journal_name) {
retval = EXT2_ET_LOAD_EXT_JOURNAL;
goto errout;
}
jfs_debug(1, "Using journal file %s\n", journal_name);
io_ptr = unix_io_manager;
}
#if 0
test_io_backing_manager = io_ptr;
io_ptr = test_io_manager;
#endif
#ifndef USE_INODE_IO
if (ext_journal)
#endif
{
retval = io_ptr->open(journal_name, fs->flags & EXT2_FLAG_RW,
&fs->journal_io);
}
if (retval)
goto errout;
io_channel_set_blksize(fs->journal_io, fs->blocksize);
if (ext_journal) {
blk64_t maxlen;
start = ext2fs_journal_sb_start(fs->blocksize) - 1;
bh = getblk(dev_journal, start, fs->blocksize);
if (!bh) {
retval = EXT2_ET_NO_MEMORY;
goto errout;
}
ll_rw_block(READ, 1, &bh);
retval = bh->b_err;
if (retval) {
brelse(bh);
goto errout;
}
memcpy(&jsuper, start ? bh->b_data :
bh->b_data + SUPERBLOCK_OFFSET,
sizeof(jsuper));
#ifdef WORDS_BIGENDIAN
if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
ext2fs_swap_super(&jsuper);
#endif
if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
!ext2fs_has_feature_journal_dev(&jsuper)) {
retval = EXT2_ET_LOAD_EXT_JOURNAL;
brelse(bh);
goto errout;
}
/* Make sure the journal UUID is correct */
if (memcmp(jsuper.s_uuid, fs->super->s_journal_uuid,
sizeof(jsuper.s_uuid))) {
retval = EXT2_ET_LOAD_EXT_JOURNAL;
brelse(bh);
goto errout;
}
/* Check the superblock checksum */
if (ext2fs_has_feature_metadata_csum(&jsuper)) {
struct struct_ext2_filsys fsx;
struct ext2_super_block superx;
void *p;
p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
memcpy(&fsx, fs, sizeof(fsx));
memcpy(&superx, fs->super, sizeof(superx));
fsx.super = &superx;
ext2fs_set_feature_metadata_csum(fsx.super);
if (!ext2fs_superblock_csum_verify(&fsx, p)) {
retval = EXT2_ET_LOAD_EXT_JOURNAL;
brelse(bh);
goto errout;
}
}
brelse(bh);
maxlen = ext2fs_blocks_count(&jsuper);
journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen :
(1ULL << 32) - 1;
start++;
}
bh = getblk(dev_journal, start, journal->j_blocksize);
if (!bh) {
retval = EXT2_ET_NO_MEMORY;
goto errout;
}
journal->j_sb_buffer = bh;
journal->j_superblock = (journal_superblock_t *)bh->b_data;
#ifdef USE_INODE_IO
if (j_inode)
ext2fs_free_mem(&j_inode);
#endif
*ret_journal = journal;
return 0;
errout:
if (dev_fs)
ext2fs_free_mem(&dev_fs);
if (j_inode)
ext2fs_free_mem(&j_inode);
if (journal)
ext2fs_free_mem(&journal);
return retval;
}
static errcode_t ext2fs_journal_fix_bad_inode(ext2_filsys fs)
{
struct ext2_super_block *sb = fs->super;
int recover = ext2fs_has_feature_journal_needs_recovery(fs->super);
int has_journal = ext2fs_has_feature_journal(fs->super);
if (has_journal || sb->s_journal_inum) {
/* The journal inode is bogus, remove and force full fsck */
return EXT2_ET_BAD_INODE_NUM;
} else if (recover) {
return EXT2_ET_UNSUPP_FEATURE;
}
return 0;
}
#define V1_SB_SIZE 0x0024
static void clear_v2_journal_fields(journal_t *journal)
{
ext2_filsys fs = journal->j_dev->k_fs;
memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
fs->blocksize-V1_SB_SIZE);
mark_buffer_dirty(journal->j_sb_buffer);
}
static errcode_t ext2fs_journal_load(journal_t *journal)
{
ext2_filsys fs = journal->j_dev->k_fs;
journal_superblock_t *jsb;
struct buffer_head *jbh = journal->j_sb_buffer;
ll_rw_block(READ, 1, &jbh);
if (jbh->b_err)
return jbh->b_err;
jsb = journal->j_superblock;
/* If we don't even have JFS_MAGIC, we probably have a wrong inode */
if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
return ext2fs_journal_fix_bad_inode(fs);
switch (ntohl(jsb->s_header.h_blocktype)) {
case JFS_SUPERBLOCK_V1:
journal->j_format_version = 1;
if (jsb->s_feature_compat ||
jsb->s_feature_incompat ||
jsb->s_feature_ro_compat ||
jsb->s_nr_users)
clear_v2_journal_fields(journal);
break;
case JFS_SUPERBLOCK_V2:
journal->j_format_version = 2;
if (ntohl(jsb->s_nr_users) > 1 &&
uuid_is_null(fs->super->s_journal_uuid))
clear_v2_journal_fields(journal);
if (ntohl(jsb->s_nr_users) > 1)
return EXT2_ET_JOURNAL_UNSUPP_VERSION;
break;
/*
* These should never appear in a journal super block, so if
* they do, the journal is badly corrupted.
*/
case JFS_DESCRIPTOR_BLOCK:
case JFS_COMMIT_BLOCK:
case JFS_REVOKE_BLOCK:
return EXT2_ET_CORRUPT_JOURNAL_SB;
/* If we don't understand the superblock major type, but there
* is a magic number, then it is likely to be a new format we
* just don't understand, so leave it alone. */
default:
return EXT2_ET_JOURNAL_UNSUPP_VERSION;
}
if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
return EXT2_ET_UNSUPP_FEATURE;
if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
return EXT2_ET_RO_UNSUPP_FEATURE;
/* Checksum v1-3 are mutually exclusive features. */
if (jfs_has_feature_csum2(journal) && jfs_has_feature_csum3(journal))
return EXT2_ET_CORRUPT_JOURNAL_SB;
if (journal_has_csum_v2or3(journal) &&
jfs_has_feature_checksum(journal))
return EXT2_ET_CORRUPT_JOURNAL_SB;
if (!ext2fs_journal_verify_csum_type(journal, jsb) ||
!ext2fs_journal_sb_csum_verify(journal, jsb))
return EXT2_ET_CORRUPT_JOURNAL_SB;
if (journal_has_csum_v2or3(journal))
journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
sizeof(jsb->s_uuid));
/* We have now checked whether we know enough about the journal
* format to be able to proceed safely, so any other checks that
* fail we should attempt to recover from. */
if (jsb->s_blocksize != htonl(journal->j_blocksize))
return EXT2_ET_CORRUPT_JOURNAL_SB;
if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
journal->j_maxlen = ntohl(jsb->s_maxlen);
else if (ntohl(jsb->s_maxlen) > journal->j_maxlen)
return EXT2_ET_CORRUPT_JOURNAL_SB;
journal->j_tail_sequence = ntohl(jsb->s_sequence);
journal->j_transaction_sequence = journal->j_tail_sequence;
journal->j_tail = ntohl(jsb->s_start);
journal->j_first = ntohl(jsb->s_first);
journal->j_last = ntohl(jsb->s_maxlen);
return 0;
}
static void ext2fs_journal_release(ext2_filsys fs, journal_t *journal,
int reset, int drop)
{
journal_superblock_t *jsb;
if (drop)
mark_buffer_clean(journal->j_sb_buffer);
else if (fs->flags & EXT2_FLAG_RW) {
jsb = journal->j_superblock;
jsb->s_sequence = htonl(journal->j_tail_sequence);
if (reset)
jsb->s_start = 0; /* this marks the journal as empty */
ext2fs_journal_sb_csum_set(journal, jsb);
mark_buffer_dirty(journal->j_sb_buffer);
}
brelse(journal->j_sb_buffer);
if (fs && fs->journal_io) {
if (fs->io != fs->journal_io)
io_channel_close(fs->journal_io);
fs->journal_io = NULL;
free(fs->journal_name);
fs->journal_name = NULL;
}
#ifndef USE_INODE_IO
if (journal->j_inode)
ext2fs_free_mem(&journal->j_inode);
#endif
if (journal->j_fs_dev)
ext2fs_free_mem(&journal->j_fs_dev);
ext2fs_free_mem(&journal);
}
/*
* This function makes sure that the superblock fields regarding the
* journal are consistent.
*/
static errcode_t ext2fs_check_ext3_journal(ext2_filsys fs)
{
struct ext2_super_block *sb = fs->super;
journal_t *journal;
int recover = ext2fs_has_feature_journal_needs_recovery(fs->super);
errcode_t retval;
/* If we don't have any journal features, don't do anything more */
if (!ext2fs_has_feature_journal(sb) &&
!recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
uuid_is_null(sb->s_journal_uuid))
return 0;
retval = ext2fs_get_journal(fs, &journal);
if (retval)
return retval;
retval = ext2fs_journal_load(journal);
if (retval)
goto err;
/*
* We want to make the flags consistent here. We will not leave with
* needs_recovery set but has_journal clear. We can't get in a loop
* with -y, -n, or -p, only if a user isn't making up their mind.
*/
if (!ext2fs_has_feature_journal(sb)) {
retval = EXT2_ET_JOURNAL_FLAGS_WRONG;
goto err;
}
if (ext2fs_has_feature_journal(sb) &&
!ext2fs_has_feature_journal_needs_recovery(sb) &&
journal->j_superblock->s_start != 0) {
retval = EXT2_ET_JOURNAL_FLAGS_WRONG;
goto err;
}
/*
* If we don't need to do replay the journal, check to see if
* the journal's errno is set; if so, we need to mark the file
* system as being corrupt and clear the journal's s_errno.
*/
if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
journal->j_superblock->s_errno) {
fs->super->s_state |= EXT2_ERROR_FS;
ext2fs_mark_super_dirty(fs);
journal->j_superblock->s_errno = 0;
ext2fs_journal_sb_csum_set(journal, journal->j_superblock);
mark_buffer_dirty(journal->j_sb_buffer);
}
err:
ext2fs_journal_release(fs, journal, 0, retval ? 1 : 0);
return retval;
}
static errcode_t recover_ext3_journal(ext2_filsys fs)
{
journal_t *journal;
errcode_t retval;
journal_init_revoke_caches();
retval = ext2fs_get_journal(fs, &journal);
if (retval)
return retval;
retval = ext2fs_journal_load(journal);
if (retval)
goto errout;
retval = journal_init_revoke(journal, 1024);
if (retval)
goto errout;
retval = -journal_recover(journal);
if (retval)
goto errout;
if (journal->j_failed_commit) {
journal->j_superblock->s_errno = -EINVAL;
mark_buffer_dirty(journal->j_sb_buffer);
}
errout:
journal_destroy_revoke(journal);
journal_destroy_revoke_caches();
ext2fs_journal_release(fs, journal, 1, 0);
return retval;
}
errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp)
{
ext2_filsys fs = *fsp;
io_manager io_ptr = fs->io->manager;
errcode_t retval, recover_retval;
io_stats stats = 0;
unsigned long long kbytes_written = 0;
char *fsname;
int fsflags;
int fsblocksize;
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_FILE_RO;
if (fs->flags & EXT2_FLAG_DIRTY)
ext2fs_flush(fs); /* Force out any modifications */
recover_retval = recover_ext3_journal(fs);
/*
* Reload the filesystem context to get up-to-date data from disk
* because journal recovery will change the filesystem under us.
*/
if (fs->super->s_kbytes_written &&
fs->io->manager->get_stats)
fs->io->manager->get_stats(fs->io, &stats);
if (stats && stats->bytes_written)
kbytes_written = stats->bytes_written >> 10;
ext2fs_mmp_stop(fs);
fsname = fs->device_name;
fs->device_name = NULL;
fsflags = fs->flags;
fsblocksize = fs->blocksize;
ext2fs_free(fs);
*fsp = NULL;
retval = ext2fs_open(fsname, fsflags, 0, fsblocksize, io_ptr, fsp);
ext2fs_free_mem(&fsname);
if (retval)
return retval;
fs = *fsp;
fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
fs->super->s_kbytes_written += kbytes_written;
/* Set the superblock flags */
ext2fs_clear_recover(fs, recover_retval != 0);
/*
* Do one last sanity check, and propagate journal->s_errno to
* the EXT2_ERROR_FS flag in the fs superblock if needed.
*/
retval = ext2fs_check_ext3_journal(fs);
return retval ? retval : recover_retval;
}
errcode_t ext2fs_open_journal(ext2_filsys fs, journal_t **j)
{
journal_t *journal;
errcode_t retval;
journal_init_revoke_caches();
retval = ext2fs_get_journal(fs, &journal);
if (retval)
return retval;
retval = ext2fs_journal_load(journal);
if (retval)
goto errout;
retval = journal_init_revoke(journal, 1024);
if (retval)
goto errout;
if (journal->j_failed_commit) {
journal->j_superblock->s_errno = -EINVAL;
mark_buffer_dirty(journal->j_sb_buffer);
}
*j = journal;
return 0;
errout:
journal_destroy_revoke(journal);
journal_destroy_revoke_caches();
ext2fs_journal_release(fs, journal, 1, 0);
return retval;
}
errcode_t ext2fs_close_journal(ext2_filsys fs, journal_t **j)
{
journal_t *journal = *j;
journal_destroy_revoke(journal);
journal_destroy_revoke_caches();
ext2fs_journal_release(fs, journal, 0, 0);
*j = NULL;
return 0;
}
void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh)
{
struct commit_header *h;
__u32 csum;
if (!journal_has_csum_v2or3(j))
return;
h = (struct commit_header *)(bh->b_data);
h->h_chksum_type = 0;
h->h_chksum_size = 0;
h->h_chksum[0] = 0;
csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
h->h_chksum[0] = ext2fs_cpu_to_be32(csum);
}
void jbd2_revoke_csum_set(journal_t *j, struct buffer_head *bh)
{
struct journal_revoke_tail *tail;
__u32 csum;
if (!journal_has_csum_v2or3(j))
return;
tail = (struct journal_revoke_tail *)(bh->b_data + j->j_blocksize -
sizeof(struct journal_revoke_tail));
tail->r_checksum = 0;
csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
tail->r_checksum = ext2fs_cpu_to_be32(csum);
}
void jbd2_descr_block_csum_set(journal_t *j, struct buffer_head *bh)
{
struct journal_block_tail *tail;
__u32 csum;
if (!journal_has_csum_v2or3(j))
return;
tail = (struct journal_block_tail *)(bh->b_data + j->j_blocksize -
sizeof(struct journal_block_tail));
tail->t_checksum = 0;
csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
tail->t_checksum = ext2fs_cpu_to_be32(csum);
}
void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag,
struct buffer_head *bh, __u32 sequence)
{
journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag;
__u32 csum32;
__be32 seq;
if (!journal_has_csum_v2or3(j))
return;
seq = ext2fs_cpu_to_be32(sequence);
csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq));
csum32 = jbd2_chksum(j, csum32, bh->b_data, bh->b_size);
if (jfs_has_feature_csum3(j))
tag3->t_checksum = ext2fs_cpu_to_be32(csum32);
else
tag->t_checksum = ext2fs_cpu_to_be16(csum32);
}