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authorJan Kara <jack@suse.cz>2012-08-15 13:50:27 +0200
committerJan Kara <jack@suse.cz>2012-08-15 13:53:30 +0200
commit2e84f2641ea91a730642ead558a4ee3bd52310c9 (patch)
tree5eece24a86e0648a3ec235694e7f0a50ffb3cbd8 /fs/jbd
parent48d1788493f874e5d32dccb2911a7bc91c248b4b (diff)
downloadblackbird-op-linux-2e84f2641ea91a730642ead558a4ee3bd52310c9.tar.gz
blackbird-op-linux-2e84f2641ea91a730642ead558a4ee3bd52310c9.zip
jbd: don't write superblock when unmounting an ro filesystem
This sequence: results in an IO error when unmounting the RO filesystem. The bug was introduced by: commit 9754e39c7bc51328f145e933bfb0df47cd67b6e9 Author: Jan Kara <jack@suse.cz> Date: Sat Apr 7 12:33:03 2012 +0200 jbd: Split updating of journal superblock and marking journal empty which lost some of the magic in journal_update_superblock() which used to test for a journal with no outstanding transactions. This is a port of a jbd2 fix by Eric Sandeen. CC: <stable@vger.kernel.org> # 3.4.x Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/jbd')
-rw-r--r--fs/jbd/journal.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 09357508ec9a..a2862339323b 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -1113,6 +1113,11 @@ static void mark_journal_empty(journal_t *journal)
BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex));
spin_lock(&journal->j_state_lock);
+ /* Is it already empty? */
+ if (sb->s_start == 0) {
+ spin_unlock(&journal->j_state_lock);
+ return;
+ }
jbd_debug(1, "JBD: Marking journal as empty (seq %d)\n",
journal->j_tail_sequence);
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