rnbd-clt: check capacity inside rnbd_clt_change_capacity

Currently, process_msg_open_rsp checks if capacity changed or not before
call rnbd_clt_change_capacity while the checking also make sense for
rnbd_clt_resize_dev_store, let's move the checking into the function.

Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20220706133152.12058-7-guoqing.jiang@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/rnbd/rnbd-clt.c

@@ -71,6 +71,12 @@ static inline bool rnbd_clt_get_dev(struct rnbd_clt_dev *dev)
 static int rnbd_clt_change_capacity(struct rnbd_clt_dev *dev,
 				    size_t new_nsectors)
 {
+	if (get_capacity(dev->gd) == new_nsectors)
+		return 0;
+
+	/*
+	 * If the size changed, we need to revalidate it
+	 */
 	rnbd_clt_info(dev, "Device size changed from %llu to %zu sectors\n",
 		      get_capacity(dev->gd), new_nsectors);
 	set_capacity_and_notify(dev->gd, new_nsectors);
@@ -93,12 +99,7 @@ static int process_msg_open_rsp(struct rnbd_clt_dev *dev,
 	if (dev->dev_state == DEV_STATE_MAPPED_DISCONNECTED) {
 		u64 nsectors = le64_to_cpu(rsp->nsectors);
 
-		/*
-		 * If the device was remapped and the size changed in the
-		 * meantime we need to revalidate it
-		 */
-		if (get_capacity(dev->gd) != nsectors)
-			rnbd_clt_change_capacity(dev, nsectors);
+		rnbd_clt_change_capacity(dev, nsectors);
 		gd_kobj = &disk_to_dev(dev->gd)->kobj;
 		kobject_uevent(gd_kobj, KOBJ_ONLINE);
 		rnbd_clt_info(dev, "Device online, device remapped successfully\n");