linux-ext4 - [PATCH] JBD:need hold j_state_lock to updates to transaction t_state to T

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Date:	Fri, 09 May 2008 15:39:43 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Jan Kara <jack@...e.cz>
Cc:	akpm@...ux-foundation.org, linux-ext4@...r.kernel.org
Subject: [PATCH] JBD:need hold j_state_lock to updates to transaction
	t_state to T_COMMIT

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

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

Index: linux-2.6.26-rc1/fs/jbd/commit.c
===================================================================
--- linux-2.6.26-rc1.orig/fs/jbd/commit.c	2008-05-09 14:46:25.000000000 -0700
+++ linux-2.6.26-rc1/fs/jbd/commit.c	2008-05-09 15:11:00.000000000 -0700
@@ -478,7 +478,9 @@ void journal_commit_transaction(journal_
 	 * 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);
 
 	J_ASSERT(commit_transaction->t_nr_buffers <=
 		 commit_transaction->t_outstanding_credits);


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