gfs2: Factor out duplicate quota data disposal code

Rename gfs2_qd_dispose() to gfs2_qd_dispose_list().  Move some code
duplicated in gfs2_qd_dispose_list() and gfs2_quota_cleanup() into a
new gfs2_qd_dispose() function.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/quota.c

@@ -112,18 +112,10 @@ static void gfs2_qd_dealloc(struct rcu_head *rcu)
 	kmem_cache_free(gfs2_quotad_cachep, qd);
 }
 
-static void gfs2_qd_dispose(struct list_head *list)
+static void gfs2_qd_dispose(struct gfs2_quota_data *qd)
 {
-	struct gfs2_quota_data *qd;
-	struct gfs2_sbd *sdp;
-
-	while (!list_empty(list)) {
-		qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
-		sdp = qd->qd_sbd;
-
-		list_del(&qd->qd_lru);
+	struct gfs2_sbd *sdp = qd->qd_sbd;
 
-		/* Free from the filesystem-specific list */
 	spin_lock(&qd_lock);
 	list_del(&qd->qd_list);
 	spin_unlock(&qd_lock);
@@ -137,10 +129,19 @@ static void gfs2_qd_dispose(struct list_head *list)
 	gfs2_assert_warn(sdp, !qd->qd_bh_count);
 
 	gfs2_glock_put(qd->qd_gl);
-		atomic_dec(&sdp->sd_quota_count);
-
-		/* Delete it from the common reclaim list */
 	call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
+}
+
+static void gfs2_qd_list_dispose(struct list_head *list)
+{
+	struct gfs2_quota_data *qd;
+
+	while (!list_empty(list)) {
+		qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
+		list_del(&qd->qd_lru);
+
+		gfs2_qd_dispose(qd);
+		atomic_dec(&sdp->sd_quota_count);
 	}
 }
 
@@ -179,7 +180,7 @@ static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 	freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
 				     gfs2_qd_isolate, &dispose);
 
-	gfs2_qd_dispose(&dispose);
+	gfs2_qd_list_dispose(&dispose);
 
 	return freed;
 }
@@ -1469,7 +1470,7 @@ void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
 	}
 	spin_unlock(&qd_lock);
 
-	gfs2_qd_dispose(&dispose);
+	gfs2_qd_list_dispose(&dispose);
 	gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
 
 	kvfree(sdp->sd_quota_bitmap);