| Date | Mon, 03 Dec 2012 14:33:07 +0000 | From | Ben Hutchings <> | Subject | [ 81/89] jbd: Fix lock ordering bug in journal_unmap_buffer() |
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3.2-stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara <jack@suse.cz>
commit 25389bb207987b5774182f763b9fb65ff08761c8 upstream.
Commit 09e05d48 introduced a wait for transaction commit into journal_unmap_buffer() in the case we are truncating a buffer undergoing commit in the page stradding i_size on a filesystem with blocksize < pagesize. Sadly we forgot to drop buffer lock before waiting for transaction commit and thus deadlock is possible when kjournald wants to lock the buffer.
Fix the problem by dropping the buffer lock before waiting for transaction commit. Since we are still holding page lock (and that is OK), buffer cannot disappear under us.
Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- fs/jbd/transaction.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c index 78b7f84..7f5120b 100644 --- a/fs/jbd/transaction.c +++ b/fs/jbd/transaction.c @@ -1961,7 +1961,9 @@ retry: spin_unlock(&journal->j_list_lock); jbd_unlock_bh_state(bh); spin_unlock(&journal->j_state_lock); + unlock_buffer(bh); log_wait_commit(journal, tid); + lock_buffer(bh); goto retry; } /*
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