path: root/fs/jbd/commit.c
diff options
authorHidehiro Kawai <hidehiro.kawai.ez@hitachi.com>2008-10-18 20:27:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 08:52:37 -0700
commit885e353c7427db7b60692789741b34e605b0b69b (patch)
tree9b6787c07b02e7abd41a0db9575d799bcb5eaf3a /fs/jbd/commit.c
parentjbd: abort when failed to log metadata buffers (diff)
jbd: don't dirty original metadata buffer on abort
Currently, original metadata buffers are dirtied when they are unfiled whether the journal has aborted or not. Eventually these buffers will be written-back to the filesystem by pdflush. This means some metadata buffers are written to the filesystem without journaling if the journal aborts. So if both journal abort and system crash happen at the same time, the filesystem would become inconsistent state. Additionally, replaying journaled metadata can overwrite the latest metadata on the filesystem partly. Because, if the journal aborts, journaled metadata are preserved and replayed during the next mount not to lose uncheckpointed metadata. This would also break the consistency of the filesystem. This patch prevents original metadata buffers from being dirtied on abort by clearing BH_JBDDirty flag from those buffers. Thus, no metadata buffers are written to the filesystem without journaling. Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Acked-by: Jan Kara <jack@suse.cz> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/jbd/commit.c')
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index f1ea861b9929..d6a6659f3e46 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -518,9 +518,10 @@ void journal_commit_transaction(journal_t *journal)
jh = commit_transaction->t_buffers;
/* If we're in abort mode, we just un-journal the buffer and
- release it for background writing. */
+ release it. */
if (is_journal_aborted(journal)) {
+ clear_buffer_jbddirty(jh2bh(jh));
JBUFFER_TRACE(jh, "journal is aborting: refile");
journal_refile_buffer(journal, jh);
/* If that was the last one, we need to clean up
@@ -855,6 +856,8 @@ restart_loop:
if (buffer_jbddirty(bh)) {
JBUFFER_TRACE(jh, "add to new checkpointing trans");
__journal_insert_checkpoint(jh, commit_transaction);
+ if (is_journal_aborted(journal))
+ clear_buffer_jbddirty(bh);
JBUFFER_TRACE(jh, "refile for checkpoint writeback");