6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Zhang Yi <yi.zhang@xxxxxxxxxx>
[ Upstream commit a0851ea9cd555c333795b85ddd908898b937c4e1 ]
When committing transaction in jbd2_journal_commit_transaction(), the
disk caches for the filesystem device should be flushed before updating
the journal tail sequence. However, this step is missed if the journal
is not located on the filesystem device. As a result, the filesystem may
become inconsistent following a power failure or system crash. Fix it by
ensuring that the filesystem device is flushed appropriately.
Fixes: 3339578f0578 ("jbd2: cleanup journal tail after transaction commit")
Signed-off-by: Zhang Yi <yi.zhang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241203014407.805916-3-yi.zhang@xxxxxxxxxxxxxxx
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/jbd2/commit.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 0cd7439470fc..84663ff7dc50 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -777,9 +777,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
/*
* If the journal is not located on the file system device,
* then we must flush the file system device before we issue
- * the commit record
+ * the commit record and update the journal tail sequence.
*/
- if (commit_transaction->t_need_data_flush &&
+ if ((commit_transaction->t_need_data_flush || update_tail) &&
(journal->j_fs_dev != journal->j_dev) &&
(journal->j_flags & JBD2_BARRIER))
blkdev_issue_flush(journal->j_fs_dev);
--
2.39.5
