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ext4: fix data integrity for ext4_sync_fs

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Inode's data or non journaled quota may be written w/o jounral so we
_must_ send a barrier at the end of ext4_sync_fs. But it can be
skipped if journal commit will do it for us.

Also fix data integrity for nojournal mode.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Dmitry Monakhov 2013-06-12 22:25:07 -04:00 committed by Theodore Ts'o
parent 9ff8644624
commit 06a407f13d
2 changed files with 48 additions and 1 deletions
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36
fs/ext4/super.c
View File

@ -69,6 +69,7 @@ static void ext4_mark_recovery_complete(struct super_block *sb,
static void ext4_clear_journal_err(struct super_block *sb,
struct ext4_super_block *es);
static int ext4_sync_fs(struct super_block *sb, int wait);
static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
static int ext4_unfreeze(struct super_block *sb);
@ -1097,6 +1098,7 @@ static const struct super_operations ext4_nojournal_sops = {
.dirty_inode = ext4_dirty_inode,
.drop_inode = ext4_drop_inode,
.evict_inode = ext4_evict_inode,
.sync_fs = ext4_sync_fs_nojournal,
.put_super = ext4_put_super,
.statfs = ext4_statfs,
.remount_fs = ext4_remount,
@ -4553,6 +4555,7 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
{
int ret = 0;
tid_t target;
bool needs_barrier = false;
struct ext4_sb_info *sbi = EXT4_SB(sb);
trace_ext4_sync_fs(sb, wait);
@ -4563,10 +4566,41 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
* no dirty dquots
*/
dquot_writeback_dquots(sb, -1);
/*
* Data writeback is possible w/o journal transaction, so barrier must
* being sent at the end of the function. But we can skip it if
* transaction_commit will do it for us.
*/
target = jbd2_get_latest_transaction(sbi->s_journal);
if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
!jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
needs_barrier = true;
if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
if (wait)
jbd2_log_wait_commit(sbi->s_journal, target);
ret = jbd2_log_wait_commit(sbi->s_journal, target);
}
if (needs_barrier) {
int err;
err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
if (!ret)
ret = err;
}
return ret;
}
static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
{
int ret = 0;
trace_ext4_sync_fs(sb, wait);
flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
flush_workqueue(EXT4_SB(sb)->unrsv_conversion_wq);
dquot_writeback_dquots(sb, -1);
if (wait && test_opt(sb, BARRIER))
ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
return ret;
}

13
include/linux/jbd2.h
View File

@ -1374,6 +1374,19 @@ static inline u32 jbd2_chksum(journal_t *journal, u32 crc,
return *(u32 *)desc.ctx;
}
/* Return most recent uncommitted transaction */
static inline tid_t jbd2_get_latest_transaction(journal_t *journal)
{
tid_t tid;
read_lock(&journal->j_state_lock);
tid = journal->j_commit_request;
if (journal->j_running_transaction)
tid = journal->j_running_transaction->t_tid;
read_unlock(&journal->j_state_lock);
return tid;
}
#ifdef __KERNEL__
#define buffer_trace_init(bh) do {} while (0)