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authorHidehiro Kawai <hidehiro.kawai.ez@hitachi.com>2008-10-22 14:15:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-23 08:55:01 -0700
commit4afe978530702c934dfdb11f54073136818b2119 (patch)
tree5f7fb9539b46c0b390157f55c84017e14b7f605c /fs/jbd/recovery.c
parent66f50ee3cee4c9d98eea0add6f439e6e5e0ca4a5 (diff)
downloadlinux-linaro-4afe978530702c934dfdb11f54073136818b2119.tar.gz
jbd: fix error handling for checkpoint io
When a checkpointing IO fails, current JBD code doesn't check the error and continue journaling. This means latest metadata can be lost from both the journal and filesystem. This patch leaves the failed metadata blocks in the journal space and aborts journaling in the case of log_do_checkpoint(). To achieve this, we need to do: 1. don't remove the failed buffer from the checkpoint list where in the case of __try_to_free_cp_buf() because it may be released or overwritten by a later transaction 2. log_do_checkpoint() is the last chance, remove the failed buffer from the checkpoint list and abort the journal 3. when checkpointing fails, don't update the journal super block to prevent the journaled contents from being cleaned. For safety, don't update j_tail and j_tail_sequence either 4. when checkpointing fails, notify this error to the ext3 layer so that ext3 don't clear the needs_recovery flag, otherwise the journaled contents are ignored and cleaned in the recovery phase 5. if the recovery fails, keep the needs_recovery flag 6. prevent cleanup_journal_tail() from being called between __journal_drop_transaction() and journal_abort() (a race issue between journal_flush() and __log_wait_for_space() 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/recovery.c')
-rw-r--r--fs/jbd/recovery.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/jbd/recovery.c b/fs/jbd/recovery.c
index 43bc5e5ed06..db5e982c5dd 100644
--- a/fs/jbd/recovery.c
+++ b/fs/jbd/recovery.c
@@ -223,7 +223,7 @@ do { \
*/
int journal_recover(journal_t *journal)
{
- int err;
+ int err, err2;
journal_superblock_t * sb;
struct recovery_info info;
@@ -261,7 +261,10 @@ int journal_recover(journal_t *journal)
journal->j_transaction_sequence = ++info.end_transaction;
journal_clear_revoke(journal);
- sync_blockdev(journal->j_fs_dev);
+ err2 = sync_blockdev(journal->j_fs_dev);
+ if (!err)
+ err = err2;
+
return err;
}