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authorJan Kara <jack@suse.cz>2012-11-23 17:03:04 +0400
committerJan Kara <jack@suse.cz>2012-11-23 18:17:18 +0400
commit25389bb207987b5774182f763b9fb65ff08761c8 (patch)
tree84700b2e4697a4d51265e90b8b0ccac9e2ef485d /fs/jbd
parentae49eeec785025373e28dc24c8351c6bba688d99 (diff)
downloadlinux-25389bb207987b5774182f763b9fb65ff08761c8.tar.xz
jbd: Fix lock ordering bug in journal_unmap_buffer()
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. CC: stable@vger.kernel.org # Wherever commit 09e05d48 was taken Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/jbd')
-rw-r--r--fs/jbd/transaction.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 78b7f84241d4..7f5120bf0ec2 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;
}
/*