[ 3.5.y.z extended stable ] Patch "jbd2: move superblock checksum calculation to" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    jbd2: move superblock checksum calculation to

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

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

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
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 391ab024698fa4df5e560a56c761bf7f4a728396 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso at mit.edu>
Date: Mon, 1 Jul 2013 08:12:38 -0400
Subject: [PATCH] jbd2: move superblock checksum calculation to
 jbd2_write_superblock()

commit fe52d17cdd343ac43c85cf72940a58865b9d3bfb upstream.

Some of the functions which modify the jbd2 superblock were not
updating the checksum before calling jbd2_write_superblock().  Move
the call to jbd2_superblock_csum_set() to jbd2_write_superblock(), so
that the checksum is calculated consistently.

Signed-off-by: "Theodore Ts'o" <tytso at mit.edu>
Cc: Darrick J. Wong <darrick.wong at oracle.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/jbd2/journal.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index dfb0e5b..34cdd6d 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1304,6 +1304,7 @@ static int journal_reset(journal_t *journal)
 static void jbd2_write_superblock(journal_t *journal, int write_op)
 {
 	struct buffer_head *bh = journal->j_sb_buffer;
+	journal_superblock_t *sb = journal->j_superblock;
 	int ret;

 	trace_jbd2_write_superblock(journal, write_op);
@@ -1325,6 +1326,7 @@ static void jbd2_write_superblock(journal_t *journal, int write_op)
 		clear_buffer_write_io_error(bh);
 		set_buffer_uptodate(bh);
 	}
+	jbd2_superblock_csum_set(journal, sb);
 	get_bh(bh);
 	bh->b_end_io = end_buffer_write_sync;
 	ret = submit_bh(write_op, bh);
@@ -1421,7 +1423,6 @@ void jbd2_journal_update_sb_errno(journal_t *journal)
 	jbd_debug(1, "JBD2: updating superblock error (errno %d)\n",
 		  journal->j_errno);
 	sb->s_errno    = cpu_to_be32(journal->j_errno);
-	jbd2_superblock_csum_set(journal, sb);
 	read_unlock(&journal->j_state_lock);

 	jbd2_write_superblock(journal, WRITE_SYNC);
--
1.8.1.2