gfs2: Use gfs2_qd_dispose in gfs2_quota_cleanup

Change gfs2_quota_cleanup() to move the quota data objects to dispose of
on a dispose list and call gfs2_qd_dispose() on that list, like
gfs2_qd_shrink_scan() does, instead of disposing of the quota data
objects directly.

This may look a bit pointless by itself, but it will make more sense in
combination with a fix that follows.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/quota.c

@@ -1459,35 +1459,17 @@ int gfs2_quota_init(struct gfs2_sbd *sdp)
 
 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
 {
-	struct list_head *head = &sdp->sd_quota_list;
 	struct gfs2_quota_data *qd;
+	LIST_HEAD(dispose);
 
 	spin_lock(&qd_lock);
-	while (!list_empty(head)) {
-		qd = list_last_entry(head, struct gfs2_quota_data, qd_list);
-
-		list_del(&qd->qd_list);
-
-		/* Also remove if this qd exists in the reclaim list */
+	list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 		list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
-		atomic_dec(&sdp->sd_quota_count);
-		spin_unlock(&qd_lock);
-
-		spin_lock_bucket(qd->qd_hash);
-		hlist_bl_del_rcu(&qd->qd_hlist);
-		spin_unlock_bucket(qd->qd_hash);
-
-		gfs2_assert_warn(sdp, !qd->qd_change);
-		gfs2_assert_warn(sdp, !qd->qd_slot_count);
-		gfs2_assert_warn(sdp, !qd->qd_bh_count);
-
-		gfs2_glock_put(qd->qd_gl);
-		call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
-
-		spin_lock(&qd_lock);
+		list_add(&qd->qd_lru, &dispose);
 	}
 	spin_unlock(&qd_lock);
 
+	gfs2_qd_dispose(&dispose);
 	gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
 
 	kvfree(sdp->sd_quota_bitmap);