diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 99a0dd58602e105814db2f573bc13e8fe75f8dbf..d5828b9dbfef751b04f3cf434efe98bfbe3f2049 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -120,11 +120,6 @@ static inline struct device *nbd_to_dev(struct nbd_device *nbd)
 	return disk_to_dev(nbd->disk);
 }
 
-static bool nbd_is_connected(struct nbd_device *nbd)
-{
-	return !!nbd->task_recv;
-}
-
 static const char *nbdcmd_to_ascii(int cmd)
 {
 	switch (cmd) {
@@ -160,36 +155,30 @@ static void nbd_mark_nsock_dead(struct nbd_sock *nsock)
 	nsock->sent = 0;
 }
 
-static int nbd_size_clear(struct nbd_device *nbd, struct block_device *bdev)
+static void nbd_size_clear(struct nbd_device *nbd)
 {
 	if (nbd->config->bytesize) {
-		if (bdev->bd_openers <= 1)
-			bd_set_size(bdev, 0);
 		set_capacity(nbd->disk, 0);
 		kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
 	}
-
-	return 0;
 }
 
-static void nbd_size_update(struct nbd_device *nbd, struct block_device *bdev)
+static void nbd_size_update(struct nbd_device *nbd)
 {
 	struct nbd_config *config = nbd->config;
 	blk_queue_logical_block_size(nbd->disk->queue, config->blksize);
 	blk_queue_physical_block_size(nbd->disk->queue, config->blksize);
-	bd_set_size(bdev, config->bytesize);
 	set_capacity(nbd->disk, config->bytesize >> 9);
 	kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
 }
 
-static void nbd_size_set(struct nbd_device *nbd, struct block_device *bdev,
-			loff_t blocksize, loff_t nr_blocks)
+static void nbd_size_set(struct nbd_device *nbd, loff_t blocksize,
+			 loff_t nr_blocks)
 {
 	struct nbd_config *config = nbd->config;
 	config->blksize = blocksize;
 	config->bytesize = blocksize * nr_blocks;
-	if (nbd_is_connected(nbd))
-		nbd_size_update(nbd, bdev);
+	nbd_size_update(nbd);
 }
 
 static void nbd_end_request(struct nbd_cmd *cmd)
@@ -739,8 +728,7 @@ static int nbd_queue_rq(struct blk_mq_hw_ctx *hctx,
 	return ret;
 }
 
-static int nbd_add_socket(struct nbd_device *nbd, struct block_device *bdev,
-			  unsigned long arg)
+static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg)
 {
 	struct nbd_config *config = nbd->config;
 	struct socket *sock;
@@ -783,8 +771,6 @@ static int nbd_add_socket(struct nbd_device *nbd, struct block_device *bdev,
 	nsock->sent = 0;
 	socks[config->num_connections++] = nsock;
 
-	if (max_part)
-		bdev->bd_invalidated = 1;
 	return 0;
 }
 
@@ -800,19 +786,20 @@ static void nbd_bdev_reset(struct block_device *bdev)
 {
 	if (bdev->bd_openers > 1)
 		return;
-	set_device_ro(bdev, false);
-	bdev->bd_inode->i_size = 0;
+	bd_set_size(bdev, 0);
 	if (max_part > 0) {
 		blkdev_reread_part(bdev);
 		bdev->bd_invalidated = 1;
 	}
 }
 
-static void nbd_parse_flags(struct nbd_device *nbd, struct block_device *bdev)
+static void nbd_parse_flags(struct nbd_device *nbd)
 {
 	struct nbd_config *config = nbd->config;
 	if (config->flags & NBD_FLAG_READ_ONLY)
-		set_device_ro(bdev, true);
+		set_disk_ro(nbd->disk, true);
+	else
+		set_disk_ro(nbd->disk, false);
 	if (config->flags & NBD_FLAG_SEND_TRIM)
 		queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue);
 	if (config->flags & NBD_FLAG_SEND_FLUSH)
@@ -841,52 +828,36 @@ static void send_disconnects(struct nbd_device *nbd)
 	}
 }
 
-static int nbd_disconnect(struct nbd_device *nbd, struct block_device *bdev)
+static int nbd_disconnect(struct nbd_device *nbd)
 {
 	struct nbd_config *config = nbd->config;
 
 	dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n");
-	mutex_unlock(&nbd->config_lock);
-	fsync_bdev(bdev);
-	mutex_lock(&nbd->config_lock);
-
 	if (!test_and_set_bit(NBD_DISCONNECT_REQUESTED,
 			      &config->runtime_flags))
 		send_disconnects(nbd);
 	return 0;
 }
 
-static int nbd_clear_sock(struct nbd_device *nbd, struct block_device *bdev)
+static void nbd_clear_sock(struct nbd_device *nbd)
 {
 	sock_shutdown(nbd);
 	nbd_clear_que(nbd);
-
-	__invalidate_device(bdev, true);
-	nbd_bdev_reset(bdev);
 	nbd->task_setup = NULL;
-	return 0;
 }
 
 static void nbd_config_put(struct nbd_device *nbd)
 {
 	if (refcount_dec_and_mutex_lock(&nbd->config_refs,
 					&nbd->config_lock)) {
-		struct block_device *bdev;
 		struct nbd_config *config = nbd->config;
-
-		bdev = bdget_disk(nbd->disk, 0);
-		if (!bdev) {
-			mutex_unlock(&nbd->config_lock);
-			return;
-		}
-
 		nbd_dev_dbg_close(nbd);
-		nbd_size_clear(nbd, bdev);
+		nbd_size_clear(nbd);
 		if (test_and_clear_bit(NBD_HAS_PID_FILE,
 				       &config->runtime_flags))
 			device_remove_file(disk_to_dev(nbd->disk), &pid_attr);
 		nbd->task_recv = NULL;
-		nbd_clear_sock(nbd, bdev);
+		nbd_clear_sock(nbd);
 		if (config->num_connections) {
 			int i;
 			for (i = 0; i < config->num_connections; i++) {
@@ -897,7 +868,6 @@ static void nbd_config_put(struct nbd_device *nbd)
 		}
 		nbd_reset(nbd);
 		mutex_unlock(&nbd->config_lock);
-		bdput(bdev);
 		module_put(THIS_MODULE);
 	}
 }
@@ -912,27 +882,30 @@ static int nbd_start_device(struct nbd_device *nbd, struct block_device *bdev)
 		return -EBUSY;
 	if (!config->socks)
 		return -EINVAL;
-
 	if (num_connections > 1 &&
 	    !(config->flags & NBD_FLAG_CAN_MULTI_CONN)) {
 		dev_err(disk_to_dev(nbd->disk), "server does not support multiple connections per device.\n");
 		return -EINVAL;
 	}
 
+	if (max_part)
+		bdev->bd_invalidated = 1;
 	blk_mq_update_nr_hw_queues(&nbd->tag_set, config->num_connections);
 	nbd->task_recv = current;
 	mutex_unlock(&nbd->config_lock);
 
-	nbd_parse_flags(nbd, bdev);
+	nbd_parse_flags(nbd);
 
 	error = device_create_file(disk_to_dev(nbd->disk), &pid_attr);
 	if (error) {
 		dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n");
 		return error;
 	}
-	set_bit(NBD_HAS_PID_FILE, &config->runtime_flags);
 
-	nbd_size_update(nbd, bdev);
+	set_bit(NBD_HAS_PID_FILE, &config->runtime_flags);
+	if (max_part)
+		bdev->bd_invalidated = 1;
+	bd_set_size(bdev, config->bytesize);
 
 	nbd_dev_dbg_init(nbd);
 	for (i = 0; i < num_connections; i++) {
@@ -965,6 +938,14 @@ static int nbd_start_device(struct nbd_device *nbd, struct block_device *bdev)
 	return error;
 }
 
+static void nbd_clear_sock_ioctl(struct nbd_device *nbd,
+				 struct block_device *bdev)
+{
+	nbd_clear_sock(nbd);
+	kill_bdev(bdev);
+	nbd_bdev_reset(bdev);
+}
+
 /* Must be called with config_lock held */
 static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
 		       unsigned int cmd, unsigned long arg)
@@ -973,21 +954,22 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
 
 	switch (cmd) {
 	case NBD_DISCONNECT:
-		return nbd_disconnect(nbd, bdev);
+		return nbd_disconnect(nbd);
 	case NBD_CLEAR_SOCK:
-		return nbd_clear_sock(nbd, bdev);
+		nbd_clear_sock_ioctl(nbd, bdev);
+		return 0;
 	case NBD_SET_SOCK:
-		return nbd_add_socket(nbd, bdev, arg);
+		return nbd_add_socket(nbd, arg);
 	case NBD_SET_BLKSIZE:
-		nbd_size_set(nbd, bdev, arg,
+		nbd_size_set(nbd, arg,
 			     div_s64(config->bytesize, arg));
 		return 0;
 	case NBD_SET_SIZE:
-		nbd_size_set(nbd, bdev, config->blksize,
+		nbd_size_set(nbd, config->blksize,
 			     div_s64(arg, config->blksize));
 		return 0;
 	case NBD_SET_SIZE_BLOCKS:
-		nbd_size_set(nbd, bdev, config->blksize, arg);
+		nbd_size_set(nbd, config->blksize, arg);
 		return 0;
 	case NBD_SET_TIMEOUT:
 		if (arg) {