ceph: only unregister registered bdi

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index b9cb8cebcdc1b19bace63f327182a211f32f43a5..cd81c84e96fc36531e46978aea1086c30272ae06 100644 (file)
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -942,7 +942,8 @@ static void ceph_kill_sb(struct super_block *s)
        dout("kill_sb %p\n", s);
        ceph_mdsc_pre_umount(&client->mdsc);
        kill_anon_super(s);    /* will call put_super after sb is r/o */
-       bdi_unregister(&client->backing_dev_info);
+       if (s->s_bdi == &client->backing_dev_info)
+               bdi_unregister(&client->backing_dev_info);
        bdi_destroy(&client->backing_dev_info);
        ceph_destroy_client(client);
 }