[PATCH] JBD2:need hold j_state_lock to updates to transaction t_state to T_COMMIT

[Mingming Cao <cmm@us.ibm.com>]

Updating the current transaction's t_state is being protected by j_state_lock.
We need to the same when updating the t_state to T_COMMIT.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
---
 fs/jbd2/commit.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6.26-rc1/fs/jbd2/commit.c
===================================================================
--- linux-2.6.26-rc1.orig/fs/jbd2/commit.c	2008-05-03 11:59:44.000000000 -0700
+++ linux-2.6.26-rc1/fs/jbd2/commit.c	2008-05-09 13:32:01.000000000 -0700
@@ -560,7 +560,9 @@ void jbd2_journal_commit_transaction(jou
 	 * transaction!  Now comes the tricky part: we need to write out
 	 * metadata.  Loop over the transaction's entire buffer list:
 	 */
+	spin_lock(&journal->j_state_lock);
 	commit_transaction->t_state = T_COMMIT;
+	spin_unlock(&journal->j_state_lock);
 
 	stats.u.run.rs_logging = jiffies;
 	stats.u.run.rs_flushing = jbd2_time_diff(stats.u.run.rs_flushing,