ceph: flush pending works before shutdown super

Pending works hold inode references, which cause "Busy inodes after
unmount" warning.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 40664e1..a092cdb 100644 (file)
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -674,6 +674,13 @@ fail:
        return ERR_PTR(err);
 }
 
+static void flush_fs_workqueues(struct ceph_fs_client *fsc)
+{
+       flush_workqueue(fsc->wb_wq);
+       flush_workqueue(fsc->pg_inv_wq);
+       flush_workqueue(fsc->trunc_wq);
+}
+
 static void destroy_fs_client(struct ceph_fs_client *fsc)
 {
        dout("destroy_fs_client %p\n", fsc);
@@ -1089,6 +1096,8 @@ static void ceph_kill_sb(struct super_block *s)
        dout("kill_sb %p\n", s);
 
        ceph_mdsc_pre_umount(fsc->mdsc);
+       flush_fs_workqueues(fsc);
+
        generic_shutdown_super(s);
 
        fsc->client->extra_mon_dispatch = NULL;