[GFS2] don't try to lockfs after shutdown

If an fs has already been shut down, a lockfs callback should do nothing.
An fs that's been shut down can't acquire locks or do anything with
respect to the cluster.

Also, remove FIXME comment in withdraw function.  The missing bits of the
withdraw procedure are now all done by user space.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
index 7685b46f934b..b2837839eed9 100644
--- a/fs/gfs2/ops_super.c
+++ b/fs/gfs2/ops_super.c
@@ -173,6 +173,9 @@ static void gfs2_write_super_lockfs(struct super_block *sb)
         struct gfs2_sbd *sdp = sb->s_fs_info;
         int error;
 
+        if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
+                return;
+
         for (;;) {
                 error = gfs2_freeze_fs(sdp);
                 if (!error)