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[PATCH] xfs: fix periodic log flushing

To: stable@xxxxxxxxxxxxxxx
Subject: [PATCH] xfs: fix periodic log flushing
From: Ben Myers <bpm@xxxxxxx>
Date: Fri, 25 Jan 2013 12:45:07 -0600
Cc: xfs@xxxxxxxxxxx, dchinner@xxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mutt/1.5.20 (2009-06-14)

Please take this patch for -stable in kernels 3.5-3.7.  It doesn't have an
equivalent upstream commit because the code was removed before the bug was
discovered.  See f661f1e0bf50 and 7e18530bef6a.


From: Dave Chinner <dchinner@xxxxxxxxxx>

There is a logic inversion in xfssyncd_worker() which means that the
log is not periodically forced or idled correctly. This means that
metadata changes aggregated in memory do not get flushed in a timely
manner, and hence if filesystem is not cleanly unmounted those
changes can be lost. This loss can manifest itself even hours after
the changes were made if the filesystem is left to idle without a
sync() occurring between the last modification and the
crash/shutdown occuring.

cc: <stable@xxxxxxxxxxxxxx> # 3.7, 3.6, 3.5
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Ben Myers <bpm@xxxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>

 fs/xfs/xfs_sync.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

If people agree the fix is correct, I'll post it to the -stable
list for inclusion...

diff --git a/fs/xfs/xfs_sync.c b/fs/xfs/xfs_sync.c
index 9500caf..7bf85e8 100644
--- a/fs/xfs/xfs_sync.c
+++ b/fs/xfs/xfs_sync.c
@@ -400,7 +400,7 @@ xfs_sync_worker(
         * cancel_delayed_work_sync on this work queue before tearing down
         * the ail and the log in xfs_log_unmount.
-       if (!(mp->m_super->s_flags & MS_ACTIVE) &&
+       if ((mp->m_super->s_flags & MS_ACTIVE) &&
            !(mp->m_flags & XFS_MOUNT_RDONLY)) {
                /* dgc: errors ignored here */
                if (mp->m_super->s_writers.frozen == SB_UNFROZEN &&

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