linux-kernel - [PATCH 3.12 059/119] xfs: fix superblock inprogress check

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Date:   Thu, 29 Sep 2016 12:24:55 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dave Chinner <dchinner@...hat.com>,
        Dave Chinner <david@...morbit.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 059/119] xfs: fix superblock inprogress check

From: Dave Chinner <dchinner@...hat.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit f3d7ebdeb2c297bd26272384e955033493ca291c upstream.

>From inspection, the superblock sb_inprogress check is done in the
verifier and triggered only for the primary superblock via a
"bp->b_bn == XFS_SB_DADDR" check.

Unfortunately, the primary superblock is an uncached buffer, and
hence it is configured by xfs_buf_read_uncached() with:

	bp->b_bn = XFS_BUF_DADDR_NULL;  /* always null for uncached buffers */

And so this check never triggers. Fix it.

Signed-off-by: Dave Chinner <dchinner@...hat.com>
Reviewed-by: Brian Foster <bfoster@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Dave Chinner <david@...morbit.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/xfs/xfs_sb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_sb.c b/fs/xfs/xfs_sb.c
index 1351ff0d77ab..44c53ab4add6 100644
--- a/fs/xfs/xfs_sb.c
+++ b/fs/xfs/xfs_sb.c
@@ -602,7 +602,8 @@ xfs_sb_verify(
 	 * Only check the in progress field for the primary superblock as
 	 * mkfs.xfs doesn't clear it from secondary superblocks.
 	 */
-	return xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR,
+	return xfs_mount_validate_sb(mp, &sb,
+				     bp->b_maps[0].bm_bn == XFS_SB_DADDR,
 				     check_version);
 }
 
-- 
2.10.0