[3.5.y.z,extended,stable] Patch "jbd: Fix lock ordering bug in journal_unmap_buffer()" has been added to staging queue

Submitted by Herton Ronaldo Krzesinski on Dec. 10, 2012, 5 p.m.


Message ID 1355158836-15952-1-git-send-email-herton.krzesinski@canonical.com
State New
Headers show

Commit Message

Herton Ronaldo Krzesinski Dec. 10, 2012, 5 p.m.
This is a note to let you know that I have just added a patch titled

    jbd: Fix lock ordering bug in journal_unmap_buffer()

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From 2296eceed4448cb8d44a169e0f6eecbedd133416 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Fri, 23 Nov 2012 14:03:04 +0100
Subject: [PATCH] jbd: Fix lock ordering bug in journal_unmap_buffer()

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: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
 fs/jbd/transaction.c |    2 ++
 1 file changed, 2 insertions(+)


Patch hide | download patch | download mbox

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:
+			unlock_buffer(bh);
 			log_wait_commit(journal, tid);
+			lock_buffer(bh);
 			goto retry;