jbd2: Fix barrier fallback code to re-lock the buffer head

If the device doesn't support write barriers, the write is retried
without ordered mode.  But the buffer head needs to be re-locked or
submit_bh will fail with on BUG(!buffer_locked(bh)).

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 4d99685fdce4..a2ed72f7ceee 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -168,6 +168,7 @@ static int journal_submit_commit_record(journal_t *journal,
                 spin_unlock(&journal->j_state_lock);
 
                 /* And try again, without the barrier */
+                lock_buffer(bh);
                 set_buffer_uptodate(bh);
                 set_buffer_dirty(bh);
                 ret = submit_bh(WRITE, bh);