linux-ext4 - [PATCH v2] jbd2: Always set journal superblock checksum when writing out superblock

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Date:	Mon, 13 May 2013 14:49:40 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Andreas Dilger <adilger@...ger.ca>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: [PATCH v2] jbd2: Always set journal superblock checksum when writing
 out superblock

Avoid future programming errors by making it so that the journal superblock
checksum is set in jbd2_write_superblock.  This fixes some journal checksum
failures when metadata_csum is turned on.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 fs/jbd2/journal.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 4576bec..85550bf 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1325,6 +1325,7 @@ static void jbd2_write_superblock(journal_t *journal, int write_op)
 	if (!(journal->j_flags & JBD2_BARRIER))
 		write_op &= ~(REQ_FUA | REQ_FLUSH);
 	lock_buffer(bh);
+	jbd2_superblock_csum_set(journal, journal->j_superblock);
 	if (buffer_write_io_error(bh)) {
 		/*
 		 * Oh, dear.  A previous attempt to write the journal
@@ -1436,7 +1437,6 @@ 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);
--
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