xfs: rationalise xfs_mount_wq users

Instead of starting and stopping background work on the xfs_mount_wq
all at the same time, separate them to where they really are needed
to start and stop.

The xfs_sync_worker, only needs to be started after all the mount
processing has completed successfully, while it needs to be stopped
before the log is unmounted.

The xfs_reclaim_worker is started on demand, and can be
stopped before the unmount process does it's own inode reclaim pass.

The xfs_flush_inodes work is run on demand, and so we really only
need to ensure that it has stopped running before we start
processing an unmount, freeze or remount,ro.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index b2bd3a0e6376..d9a31c6a0c53 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1450,9 +1450,11 @@ xfs_unmountfs(
 
         /*
          * And reclaim all inodes.  At this point there should be no dirty
-         * inode, and none should be pinned or locked, but use synchronous
-         * reclaim just to be sure.
+         * inodes and none should be pinned or locked, but use synchronous
+         * reclaim just to be sure. We can stop background inode reclaim
+         * here as well if it is still running.
          */
+        cancel_delayed_work_sync(&mp->m_reclaim_work);
         xfs_reclaim_inodes(mp, SYNC_WAIT);
 
         xfs_qm_unmount(mp);