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hc
2024-05-14 bedbef8ad3e75a304af6361af235302bcc61d06b 
 kernel/drivers/block/nbd.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Network block device - make block devices work over TCP
34  *
....@@ -6,8 +7,6 @@
67  * 
78  * Copyright 1997-2000, 2008 Pavel Machek <pavel@ucw.cz>
89  * Parts copyright 2001 Steven Whitehouse <steve@chygwyn.com>
9
- *
10
- * This file is released under GPLv2 or later.
1110  *
1211  * (part of code stolen from loop.c)
1312  */
....@@ -27,6 +26,7 @@
2726 #include <linux/ioctl.h>
2827 #include <linux/mutex.h>
2928 #include <linux/compiler.h>
29
+#include <linux/completion.h>
3030 #include <linux/err.h>
3131 #include <linux/kernel.h>
3232 #include <linux/slab.h>
....@@ -43,6 +43,9 @@
4343 #include <linux/nbd.h>
4444 #include <linux/nbd-netlink.h>
4545 #include <net/genetlink.h>
46
+
47
+#define CREATE_TRACE_POINTS
48
+#include <trace/events/nbd.h>
4649 
4750 static DEFINE_IDR(nbd_index_idr);
4851 static DEFINE_MUTEX(nbd_index_mutex);
....@@ -69,14 +72,16 @@
6972 	int index;
7073 };
7174 
72
-#define NBD_TIMEDOUT			0
75
+#define NBD_RT_TIMEDOUT			0
76
+#define NBD_RT_DISCONNECT_REQUESTED	1
77
+#define NBD_RT_DISCONNECTED		2
78
+#define NBD_RT_HAS_PID_FILE		3
79
+#define NBD_RT_HAS_CONFIG_REF		4
80
+#define NBD_RT_BOUND			5
81
+#define NBD_RT_DISCONNECT_ON_CLOSE	6
82
+
83
+#define NBD_DESTROY_ON_DISCONNECT	0
7384 #define NBD_DISCONNECT_REQUESTED	1
74
-#define NBD_DISCONNECTED		2
75
-#define NBD_HAS_PID_FILE		3
76
-#define NBD_HAS_CONFIG_REF		4
77
-#define NBD_BOUND			5
78
-#define NBD_DESTROY_ON_DISCONNECT	6
79
-#define NBD_DISCONNECT_ON_CLOSE 	7
8085 
8186 struct nbd_config {
8287 	u32 flags;
....@@ -111,6 +116,9 @@
111116 	struct list_head list;
112117 	struct task_struct *task_recv;
113118 	struct task_struct *task_setup;
119
+
120
+	struct completion *destroy_complete;
121
+	unsigned long flags;
114122 };
115123 
116124 #define NBD_CMD_REQUEUED	1
....@@ -120,6 +128,7 @@
120128 	struct mutex lock;
121129 	int index;
122130 	int cookie;
131
+	int retries;
123132 	blk_status_t status;
124133 	unsigned long flags;
125134 	u32 cmd_cookie;
....@@ -220,6 +229,16 @@
220229 		disk->private_data = NULL;
221230 		put_disk(disk);
222231 	}
232
+
233
+	/*
234
+	 * Place this in the last just before the nbd is freed to
235
+	 * make sure that the disk and the related kobject are also
236
+	 * totally removed to avoid duplicate creation of the same
237
+	 * one.
238
+	 */
239
+	if (test_bit(NBD_DESTROY_ON_DISCONNECT, &nbd->flags) && nbd->destroy_complete)
240
+		complete(nbd->destroy_complete);
241
+
223242 	kfree(nbd);
224243 }
225244 
....@@ -235,8 +254,8 @@
235254 
236255 static int nbd_disconnected(struct nbd_config *config)
237256 {
238
-	return test_bit(NBD_DISCONNECTED, &config->runtime_flags) ||
239
-		test_bit(NBD_DISCONNECT_REQUESTED, &config->runtime_flags);
257
+	return test_bit(NBD_RT_DISCONNECTED, &config->runtime_flags) ||
258
+		test_bit(NBD_RT_DISCONNECT_REQUESTED, &config->runtime_flags);
240259 }
241260 
242261 static void nbd_mark_nsock_dead(struct nbd_device *nbd, struct nbd_sock *nsock,
....@@ -254,9 +273,9 @@
254273 	if (!nsock->dead) {
255274 		kernel_sock_shutdown(nsock->sock, SHUT_RDWR);
256275 		if (atomic_dec_return(&nbd->config->live_connections) == 0) {
257
-			if (test_and_clear_bit(NBD_DISCONNECT_REQUESTED,
276
+			if (test_and_clear_bit(NBD_RT_DISCONNECT_REQUESTED,
258277 					       &nbd->config->runtime_flags)) {
259
-				set_bit(NBD_DISCONNECTED,
278
+				set_bit(NBD_RT_DISCONNECTED,
260279 					&nbd->config->runtime_flags);
261280 				dev_info(nbd_to_dev(nbd),
262281 					"Disconnected due to user request.\n");
....@@ -280,6 +299,7 @@
280299 {
281300 	struct nbd_config *config = nbd->config;
282301 	struct block_device *bdev = bdget_disk(nbd->disk, 0);
302
+	sector_t nr_sectors = config->bytesize >> 9;
283303 
284304 	if (config->flags & NBD_FLAG_SEND_TRIM) {
285305 		nbd->disk->queue->limits.discard_granularity = config->blksize;
....@@ -288,14 +308,14 @@
288308 	}
289309 	blk_queue_logical_block_size(nbd->disk->queue, config->blksize);
290310 	blk_queue_physical_block_size(nbd->disk->queue, config->blksize);
291
-	set_capacity(nbd->disk, config->bytesize >> 9);
311
+	set_capacity(nbd->disk, nr_sectors);
292312 	if (bdev) {
293313 		if (bdev->bd_disk) {
294
-			bd_set_size(bdev, config->bytesize);
314
+			bd_set_nr_sectors(bdev, nr_sectors);
295315 			if (start)
296316 				set_blocksize(bdev, config->blksize);
297317 		} else
298
-			bdev->bd_invalidated = 1;
318
+			set_bit(GD_NEED_PART_SCAN, &nbd->disk->state);
299319 		bdput(bdev);
300320 	}
301321 	kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
....@@ -331,7 +351,7 @@
331351 
332352 	if (config->num_connections == 0)
333353 		return;
334
-	if (test_and_set_bit(NBD_DISCONNECTED, &config->runtime_flags))
354
+	if (test_and_set_bit(NBD_RT_DISCONNECTED, &config->runtime_flags))
335355 		return;
336356 
337357 	for (i = 0; i < config->num_connections; i++) {
....@@ -341,6 +361,22 @@
341361 		mutex_unlock(&nsock->tx_lock);
342362 	}
343363 	dev_warn(disk_to_dev(nbd->disk), "shutting down sockets\n");
364
+}
365
+
366
+static u32 req_to_nbd_cmd_type(struct request *req)
367
+{
368
+	switch (req_op(req)) {
369
+	case REQ_OP_DISCARD:
370
+		return NBD_CMD_TRIM;
371
+	case REQ_OP_FLUSH:
372
+		return NBD_CMD_FLUSH;
373
+	case REQ_OP_WRITE:
374
+		return NBD_CMD_WRITE;
375
+	case REQ_OP_READ:
376
+		return NBD_CMD_READ;
377
+	default:
378
+		return U32_MAX;
379
+	}
344380 }
345381 
346382 static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req,
....@@ -360,16 +396,19 @@
360396 	}
361397 	config = nbd->config;
362398 
363
-	if (config->num_connections > 1) {
399
+	if (config->num_connections > 1 ||
400
+	    (config->num_connections == 1 && nbd->tag_set.timeout)) {
364401 		dev_err_ratelimited(nbd_to_dev(nbd),
365402 				    "Connection timed out, retrying (%d/%d alive)\n",
366403 				    atomic_read(&config->live_connections),
367404 				    config->num_connections);
368405 		/*
369406 		 * Hooray we have more connections, requeue this IO, the submit
370
-		 * path will put it on a real connection.
407
+		 * path will put it on a real connection. Or if only one
408
+		 * connection is configured, the submit path will wait util
409
+		 * a new connection is reconfigured or util dead timeout.
371410 		 */
372
-		if (config->socks && config->num_connections > 1) {
411
+		if (config->socks) {
373412 			if (cmd->index < config->num_connections) {
374413 				struct nbd_sock *nsock =
375414 					config->socks[cmd->index];
....@@ -389,11 +428,36 @@
389428 			nbd_config_put(nbd);
390429 			return BLK_EH_DONE;
391430 		}
392
-	} else {
393
-		dev_err_ratelimited(nbd_to_dev(nbd),
394
-				    "Connection timed out\n");
395431 	}
396
-	set_bit(NBD_TIMEDOUT, &config->runtime_flags);
432
+
433
+	if (!nbd->tag_set.timeout) {
434
+		/*
435
+		 * Userspace sets timeout=0 to disable socket disconnection,
436
+		 * so just warn and reset the timer.
437
+		 */
438
+		struct nbd_sock *nsock = config->socks[cmd->index];
439
+		cmd->retries++;
440
+		dev_info(nbd_to_dev(nbd), "Possible stuck request %p: control (%s@%llu,%uB). Runtime %u seconds\n",
441
+			req, nbdcmd_to_ascii(req_to_nbd_cmd_type(req)),
442
+			(unsigned long long)blk_rq_pos(req) << 9,
443
+			blk_rq_bytes(req), (req->timeout / HZ) * cmd->retries);
444
+
445
+		mutex_lock(&nsock->tx_lock);
446
+		if (cmd->cookie != nsock->cookie) {
447
+			nbd_requeue_cmd(cmd);
448
+			mutex_unlock(&nsock->tx_lock);
449
+			mutex_unlock(&cmd->lock);
450
+			nbd_config_put(nbd);
451
+			return BLK_EH_DONE;
452
+		}
453
+		mutex_unlock(&nsock->tx_lock);
454
+		mutex_unlock(&cmd->lock);
455
+		nbd_config_put(nbd);
456
+		return BLK_EH_RESET_TIMER;
457
+	}
458
+
459
+	dev_err_ratelimited(nbd_to_dev(nbd), "Connection timed out\n");
460
+	set_bit(NBD_RT_TIMEDOUT, &config->runtime_flags);
397461 	cmd->status = BLK_STS_IOERR;
398462 	mutex_unlock(&cmd->lock);
399463 	sock_shutdown(nbd);
....@@ -478,24 +542,11 @@
478542 	u32 nbd_cmd_flags = 0;
479543 	int sent = nsock->sent, skip = 0;
480544 
481
-	iov_iter_kvec(&from, WRITE | ITER_KVEC, &iov, 1, sizeof(request));
545
+	iov_iter_kvec(&from, WRITE, &iov, 1, sizeof(request));
482546 
483
-	switch (req_op(req)) {
484
-	case REQ_OP_DISCARD:
485
-		type = NBD_CMD_TRIM;
486
-		break;
487
-	case REQ_OP_FLUSH:
488
-		type = NBD_CMD_FLUSH;
489
-		break;
490
-	case REQ_OP_WRITE:
491
-		type = NBD_CMD_WRITE;
492
-		break;
493
-	case REQ_OP_READ:
494
-		type = NBD_CMD_READ;
495
-		break;
496
-	default:
547
+	type = req_to_nbd_cmd_type(req);
548
+	if (type == U32_MAX)
497549 		return -EIO;
498
-	}
499550 
500551 	if (rq_data_dir(req) == WRITE &&
501552 	    (config->flags & NBD_FLAG_READ_ONLY)) {
....@@ -514,6 +565,10 @@
514565 	if (sent) {
515566 		if (sent >= sizeof(request)) {
516567 			skip = sent - sizeof(request);
568
+
569
+			/* initialize handle for tracing purposes */
570
+			handle = nbd_cmd_handle(cmd);
571
+
517572 			goto send_pages;
518573 		}
519574 		iov_iter_advance(&from, sent);
....@@ -522,6 +577,7 @@
522577 	}
523578 	cmd->index = index;
524579 	cmd->cookie = nsock->cookie;
580
+	cmd->retries = 0;
525581 	request.type = htonl(type | nbd_cmd_flags);
526582 	if (type != NBD_CMD_FLUSH) {
527583 		request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9);
....@@ -530,11 +586,14 @@
530586 	handle = nbd_cmd_handle(cmd);
531587 	memcpy(request.handle, &handle, sizeof(handle));
532588 
589
+	trace_nbd_send_request(&request, nbd->index, blk_mq_rq_from_pdu(cmd));
590
+
533591 	dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n",
534592 		req, nbdcmd_to_ascii(type),
535593 		(unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req));
536594 	result = sock_xmit(nbd, index, 1, &from,
537595 			(type == NBD_CMD_WRITE) ? MSG_MORE : 0, &sent);
596
+	trace_nbd_header_sent(req, handle);
538597 	if (result <= 0) {
539598 		if (was_interrupted(result)) {
540599 			/* If we havne't sent anything we can just return BUSY,
....@@ -569,8 +628,7 @@
569628 
570629 			dev_dbg(nbd_to_dev(nbd), "request %p: sending %d bytes data\n",
571630 				req, bvec.bv_len);
572
-			iov_iter_bvec(&from, ITER_BVEC | WRITE,
573
-				      &bvec, 1, bvec.bv_len);
631
+			iov_iter_bvec(&from, WRITE, &bvec, 1, bvec.bv_len);
574632 			if (skip) {
575633 				if (skip >= iov_iter_count(&from)) {
576634 					skip -= iov_iter_count(&from);
....@@ -608,6 +666,7 @@
608666 		bio = next;
609667 	}
610668 out:
669
+	trace_nbd_payload_sent(req, handle);
611670 	nsock->pending = NULL;
612671 	nsock->sent = 0;
613672 	return 0;
....@@ -629,7 +688,7 @@
629688 	int ret = 0;
630689 
631690 	reply.magic = 0;
632
-	iov_iter_kvec(&to, READ | ITER_KVEC, &iov, 1, sizeof(reply));
691
+	iov_iter_kvec(&to, READ, &iov, 1, sizeof(reply));
633692 	result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL);
634693 	if (result <= 0) {
635694 		if (!nbd_disconnected(config))
....@@ -655,6 +714,7 @@
655714 			tag, req);
656715 		return ERR_PTR(-ENOENT);
657716 	}
717
+	trace_nbd_header_received(req, handle);
658718 	cmd = blk_mq_rq_to_pdu(req);
659719 
660720 	mutex_lock(&cmd->lock);
....@@ -689,21 +749,18 @@
689749 		struct bio_vec bvec;
690750 
691751 		rq_for_each_segment(bvec, req, iter) {
692
-			iov_iter_bvec(&to, ITER_BVEC | READ,
693
-				      &bvec, 1, bvec.bv_len);
752
+			iov_iter_bvec(&to, READ, &bvec, 1, bvec.bv_len);
694753 			result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL);
695754 			if (result <= 0) {
696755 				dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n",
697756 					result);
698757 				/*
699
-				 * If we've disconnected or we only have 1
700
-				 * connection then we need to make sure we
758
+				 * If we've disconnected, we need to make sure we
701759 				 * complete this request, otherwise error out
702760 				 * and let the timeout stuff handle resubmitting
703761 				 * this request onto another connection.
704762 				 */
705
-				if (nbd_disconnected(config) ||
706
-				    config->num_connections <= 1) {
763
+				if (nbd_disconnected(config)) {
707764 					cmd->status = BLK_STS_IOERR;
708765 					goto out;
709766 				}
....@@ -715,6 +772,7 @@
715772 		}
716773 	}
717774 out:
775
+	trace_nbd_payload_received(req, handle);
718776 	mutex_unlock(&cmd->lock);
719777 	return ret ? ERR_PTR(ret) : cmd;
720778 }
....@@ -727,6 +785,7 @@
727785 	struct nbd_device *nbd = args->nbd;
728786 	struct nbd_config *config = nbd->config;
729787 	struct nbd_cmd *cmd;
788
+	struct request *rq;
730789 
731790 	while (1) {
732791 		cmd = nbd_read_stat(nbd, args->index);
....@@ -739,7 +798,9 @@
739798 			break;
740799 		}
741800 
742
-		blk_mq_complete_request(blk_mq_rq_from_pdu(cmd));
801
+		rq = blk_mq_rq_from_pdu(cmd);
802
+		if (likely(!blk_should_fake_timeout(rq->q)))
803
+			blk_mq_complete_request(rq);
743804 	}
744805 	nbd_config_put(nbd);
745806 	atomic_dec(&config->recv_threads);
....@@ -747,15 +808,20 @@
747808 	kfree(args);
748809 }
749810 
750
-static void nbd_clear_req(struct request *req, void *data, bool reserved)
811
+static bool nbd_clear_req(struct request *req, void *data, bool reserved)
751812 {
752813 	struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req);
814
+
815
+	/* don't abort one completed request */
816
+	if (blk_mq_request_completed(req))
817
+		return true;
753818 
754819 	mutex_lock(&cmd->lock);
755820 	cmd->status = BLK_STS_IOERR;
756821 	mutex_unlock(&cmd->lock);
757822 
758823 	blk_mq_complete_request(req);
824
+	return true;
759825 }
760826 
761827 static void nbd_clear_que(struct nbd_device *nbd)
....@@ -773,12 +839,12 @@
773839 	struct nbd_sock *nsock = config->socks[index];
774840 	int fallback = nsock->fallback_index;
775841 
776
-	if (test_bit(NBD_DISCONNECTED, &config->runtime_flags))
842
+	if (test_bit(NBD_RT_DISCONNECTED, &config->runtime_flags))
777843 		return new_index;
778844 
779845 	if (config->num_connections <= 1) {
780846 		dev_err_ratelimited(disk_to_dev(nbd->disk),
781
-				    "Attempted send on invalid socket\n");
847
+				    "Dead connection, failed to find a fallback\n");
782848 		return new_index;
783849 	}
784850 
....@@ -814,11 +880,15 @@
814880 	struct nbd_config *config = nbd->config;
815881 	if (!config->dead_conn_timeout)
816882 		return 0;
817
-	if (test_bit(NBD_DISCONNECTED, &config->runtime_flags))
883
+
884
+	if (!wait_event_timeout(config->conn_wait,
885
+				test_bit(NBD_RT_DISCONNECTED,
886
+					 &config->runtime_flags) ||
887
+				atomic_read(&config->live_connections) > 0,
888
+				config->dead_conn_timeout))
818889 		return 0;
819
-	return wait_event_timeout(config->conn_wait,
820
-				  atomic_read(&config->live_connections) > 0,
821
-				  config->dead_conn_timeout) > 0;
890
+
891
+	return !test_bit(NBD_RT_DISCONNECTED, &config->runtime_flags);
822892 }
823893 
824894 static int nbd_handle_cmd(struct nbd_cmd *cmd, int index)
....@@ -973,12 +1043,12 @@
9731043 	blk_mq_freeze_queue(nbd->disk->queue);
9741044 
9751045 	if (!netlink && !nbd->task_setup &&
976
-	    !test_bit(NBD_BOUND, &config->runtime_flags))
1046
+	    !test_bit(NBD_RT_BOUND, &config->runtime_flags))
9771047 		nbd->task_setup = current;
9781048 
9791049 	if (!netlink &&
9801050 	    (nbd->task_setup != current ||
981
-	     test_bit(NBD_BOUND, &config->runtime_flags))) {
1051
+	     test_bit(NBD_RT_BOUND, &config->runtime_flags))) {
9821052 		dev_err(disk_to_dev(nbd->disk),
9831053 			"Device being setup by another task");
9841054 		err = -EBUSY;
....@@ -1065,7 +1135,7 @@
10651135 		mutex_unlock(&nsock->tx_lock);
10661136 		sockfd_put(old);
10671137 
1068
-		clear_bit(NBD_DISCONNECTED, &config->runtime_flags);
1138
+		clear_bit(NBD_RT_DISCONNECTED, &config->runtime_flags);
10691139 
10701140 		/* We take the tx_mutex in an error path in the recv_work, so we
10711141 		 * need to queue_work outside of the tx_mutex.
....@@ -1085,7 +1155,7 @@
10851155 {
10861156 	if (bdev->bd_openers > 1)
10871157 		return;
1088
-	bd_set_size(bdev, 0);
1158
+	bd_set_nr_sectors(bdev, 0);
10891159 }
10901160 
10911161 static void nbd_parse_flags(struct nbd_device *nbd)
....@@ -1121,7 +1191,7 @@
11211191 	for (i = 0; i < config->num_connections; i++) {
11221192 		struct nbd_sock *nsock = config->socks[i];
11231193 
1124
-		iov_iter_kvec(&from, WRITE | ITER_KVEC, &iov, 1, sizeof(request));
1194
+		iov_iter_kvec(&from, WRITE, &iov, 1, sizeof(request));
11251195 		mutex_lock(&nsock->tx_lock);
11261196 		ret = sock_xmit(nbd, i, 1, &from, 0, NULL);
11271197 		if (ret <= 0)
....@@ -1136,7 +1206,8 @@
11361206 	struct nbd_config *config = nbd->config;
11371207 
11381208 	dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n");
1139
-	set_bit(NBD_DISCONNECT_REQUESTED, &config->runtime_flags);
1209
+	set_bit(NBD_RT_DISCONNECT_REQUESTED, &config->runtime_flags);
1210
+	set_bit(NBD_DISCONNECT_REQUESTED, &nbd->flags);
11401211 	send_disconnects(nbd);
11411212 	return 0;
11421213 }
....@@ -1155,7 +1226,7 @@
11551226 		struct nbd_config *config = nbd->config;
11561227 		nbd_dev_dbg_close(nbd);
11571228 		nbd_size_clear(nbd);
1158
-		if (test_and_clear_bit(NBD_HAS_PID_FILE,
1229
+		if (test_and_clear_bit(NBD_RT_HAS_PID_FILE,
11591230 				       &config->runtime_flags))
11601231 			device_remove_file(disk_to_dev(nbd->disk), &pid_attr);
11611232 		nbd->task_recv = NULL;
....@@ -1221,7 +1292,7 @@
12211292 		dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n");
12221293 		return error;
12231294 	}
1224
-	set_bit(NBD_HAS_PID_FILE, &config->runtime_flags);
1295
+	set_bit(NBD_RT_HAS_PID_FILE, &config->runtime_flags);
12251296 
12261297 	nbd_dev_dbg_init(nbd);
12271298 	for (i = 0; i < num_connections; i++) {
....@@ -1267,20 +1338,22 @@
12671338 		return ret;
12681339 
12691340 	if (max_part)
1270
-		bdev->bd_invalidated = 1;
1341
+		set_bit(GD_NEED_PART_SCAN, &nbd->disk->state);
12711342 	mutex_unlock(&nbd->config_lock);
12721343 	ret = wait_event_interruptible(config->recv_wq,
12731344 					 atomic_read(&config->recv_threads) == 0);
1274
-	if (ret)
1345
+	if (ret) {
12751346 		sock_shutdown(nbd);
1276
-	flush_workqueue(nbd->recv_workq);
1347
+		nbd_clear_que(nbd);
1348
+	}
12771349 
1350
+	flush_workqueue(nbd->recv_workq);
12781351 	mutex_lock(&nbd->config_lock);
12791352 	nbd_bdev_reset(bdev);
12801353 	/* user requested, ignore socket errors */
1281
-	if (test_bit(NBD_DISCONNECT_REQUESTED, &config->runtime_flags))
1354
+	if (test_bit(NBD_RT_DISCONNECT_REQUESTED, &config->runtime_flags))
12821355 		ret = 0;
1283
-	if (test_bit(NBD_TIMEDOUT, &config->runtime_flags))
1356
+	if (test_bit(NBD_RT_TIMEDOUT, &config->runtime_flags))
12841357 		ret = -ETIMEDOUT;
12851358 	return ret;
12861359 }
....@@ -1288,10 +1361,10 @@
12881361 static void nbd_clear_sock_ioctl(struct nbd_device *nbd,
12891362 				 struct block_device *bdev)
12901363 {
1291
-	sock_shutdown(nbd);
1364
+	nbd_clear_sock(nbd);
12921365 	__invalidate_device(bdev, true);
12931366 	nbd_bdev_reset(bdev);
1294
-	if (test_and_clear_bit(NBD_HAS_CONFIG_REF,
1367
+	if (test_and_clear_bit(NBD_RT_HAS_CONFIG_REF,
12951368 			       &nbd->config->runtime_flags))
12961369 		nbd_config_put(nbd);
12971370 }
....@@ -1302,6 +1375,15 @@
13021375 	    blksize > PAGE_SIZE)
13031376 		return false;
13041377 	return true;
1378
+}
1379
+
1380
+static void nbd_set_cmd_timeout(struct nbd_device *nbd, u64 timeout)
1381
+{
1382
+	nbd->tag_set.timeout = timeout * HZ;
1383
+	if (timeout)
1384
+		blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ);
1385
+	else
1386
+		blk_queue_rq_timeout(nbd->disk->queue, 30 * HZ);
13051387 }
13061388 
13071389 /* Must be called with config_lock held */
....@@ -1334,10 +1416,7 @@
13341416 		nbd_size_set(nbd, config->blksize, arg);
13351417 		return 0;
13361418 	case NBD_SET_TIMEOUT:
1337
-		if (arg) {
1338
-			nbd->tag_set.timeout = arg * HZ;
1339
-			blk_queue_rq_timeout(nbd->disk->queue, arg * HZ);
1340
-		}
1419
+		nbd_set_cmd_timeout(nbd, arg);
13411420 		return 0;
13421421 
13431422 	case NBD_SET_FLAGS:
....@@ -1382,7 +1461,7 @@
13821461 	/* Don't allow ioctl operations on a nbd device that was created with
13831462 	 * netlink, unless it's DISCONNECT or CLEAR_SOCK, which are fine.
13841463 	 */
1385
-	if (!test_bit(NBD_BOUND, &config->runtime_flags) ||
1464
+	if (!test_bit(NBD_RT_BOUND, &config->runtime_flags) ||
13861465 	    (cmd == NBD_DISCONNECT || cmd == NBD_CLEAR_SOCK))
13871466 		error = __nbd_ioctl(bdev, nbd, cmd, arg);
13881467 	else
....@@ -1395,15 +1474,20 @@
13951474 {
13961475 	struct nbd_config *config;
13971476 
1477
+	if (!try_module_get(THIS_MODULE))
1478
+		return ERR_PTR(-ENODEV);
1479
+
13981480 	config = kzalloc(sizeof(struct nbd_config), GFP_NOFS);
1399
-	if (!config)
1400
-		return NULL;
1481
+	if (!config) {
1482
+		module_put(THIS_MODULE);
1483
+		return ERR_PTR(-ENOMEM);
1484
+	}
1485
+
14011486 	atomic_set(&config->recv_threads, 0);
14021487 	init_waitqueue_head(&config->recv_wq);
14031488 	init_waitqueue_head(&config->conn_wait);
14041489 	config->blksize = NBD_DEF_BLKSIZE;
14051490 	atomic_set(&config->live_connections, 0);
1406
-	try_module_get(THIS_MODULE);
14071491 	return config;
14081492 }
14091493 
....@@ -1430,18 +1514,19 @@
14301514 			mutex_unlock(&nbd->config_lock);
14311515 			goto out;
14321516 		}
1433
-		config = nbd->config = nbd_alloc_config();
1434
-		if (!config) {
1435
-			ret = -ENOMEM;
1517
+		config = nbd_alloc_config();
1518
+		if (IS_ERR(config)) {
1519
+			ret = PTR_ERR(config);
14361520 			mutex_unlock(&nbd->config_lock);
14371521 			goto out;
14381522 		}
1523
+		nbd->config = config;
14391524 		refcount_set(&nbd->config_refs, 1);
14401525 		refcount_inc(&nbd->refs);
14411526 		mutex_unlock(&nbd->config_lock);
1442
-		bdev->bd_invalidated = 1;
1527
+		set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
14431528 	} else if (nbd_disconnected(nbd->config)) {
1444
-		bdev->bd_invalidated = 1;
1529
+		set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
14451530 	}
14461531 out:
14471532 	mutex_unlock(&nbd_index_mutex);
....@@ -1453,7 +1538,7 @@
14531538 	struct nbd_device *nbd = disk->private_data;
14541539 	struct block_device *bdev = bdget_disk(disk, 0);
14551540 
1456
-	if (test_bit(NBD_DISCONNECT_ON_CLOSE, &nbd->config->runtime_flags) &&
1541
+	if (test_bit(NBD_RT_DISCONNECT_ON_CLOSE, &nbd->config->runtime_flags) &&
14571542 			bdev->bd_openers == 0)
14581543 		nbd_disconnect_and_put(nbd);
14591544 	bdput(bdev);
....@@ -1539,7 +1624,7 @@
15391624 		return -EIO;
15401625 
15411626 	dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir);
1542
-	if (!dir) {
1627
+	if (IS_ERR(dir)) {
15431628 		dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s'\n",
15441629 			nbd_name(nbd));
15451630 		return -EIO;
....@@ -1565,7 +1650,7 @@
15651650 	struct dentry *dbg_dir;
15661651 
15671652 	dbg_dir = debugfs_create_dir("nbd", NULL);
1568
-	if (!dbg_dir)
1653
+	if (IS_ERR(dbg_dir))
15691654 		return -EIO;
15701655 
15711656 	nbd_dbg_dir = dbg_dir;
....@@ -1638,7 +1723,8 @@
16381723 		if (err == -ENOSPC)
16391724 			err = -EEXIST;
16401725 	} else {
1641
-		err = idr_alloc(&nbd_index_idr, nbd, 0, 0, GFP_KERNEL);
1726
+		err = idr_alloc(&nbd_index_idr, nbd, 0,
1727
+				(MINORMASK >> part_shift) + 1, GFP_KERNEL);
16421728 		if (err >= 0)
16431729 			index = err;
16441730 	}
....@@ -1653,8 +1739,9 @@
16531739 	nbd->tag_set.numa_node = NUMA_NO_NODE;
16541740 	nbd->tag_set.cmd_size = sizeof(struct nbd_cmd);
16551741 	nbd->tag_set.flags = BLK_MQ_F_SHOULD_MERGE |
1656
-		BLK_MQ_F_SG_MERGE | BLK_MQ_F_BLOCKING;
1742
+		BLK_MQ_F_BLOCKING;
16571743 	nbd->tag_set.driver_data = nbd;
1744
+	nbd->destroy_complete = NULL;
16581745 
16591746 	err = blk_mq_alloc_tag_set(&nbd->tag_set);
16601747 	if (err)
....@@ -1743,8 +1830,33 @@
17431830 	[NBD_DEVICE_CONNECTED]		=	{ .type = NLA_U8 },
17441831 };
17451832 
1833
+static int nbd_genl_size_set(struct genl_info *info, struct nbd_device *nbd)
1834
+{
1835
+	struct nbd_config *config = nbd->config;
1836
+	u64 bsize = config->blksize;
1837
+	u64 bytes = config->bytesize;
1838
+
1839
+	if (info->attrs[NBD_ATTR_SIZE_BYTES])
1840
+		bytes = nla_get_u64(info->attrs[NBD_ATTR_SIZE_BYTES]);
1841
+
1842
+	if (info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]) {
1843
+		bsize = nla_get_u64(info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]);
1844
+		if (!bsize)
1845
+			bsize = NBD_DEF_BLKSIZE;
1846
+		if (!nbd_is_valid_blksize(bsize)) {
1847
+			printk(KERN_ERR "Invalid block size %llu\n", bsize);
1848
+			return -EINVAL;
1849
+		}
1850
+	}
1851
+
1852
+	if (bytes != config->bytesize || bsize != config->blksize)
1853
+		nbd_size_set(nbd, bsize, div64_u64(bytes, bsize));
1854
+	return 0;
1855
+}
1856
+
17461857 static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info)
17471858 {
1859
+	DECLARE_COMPLETION_ONSTACK(destroy_complete);
17481860 	struct nbd_device *nbd = NULL;
17491861 	struct nbd_config *config;
17501862 	int index = -1;
....@@ -1754,8 +1866,19 @@
17541866 	if (!netlink_capable(skb, CAP_SYS_ADMIN))
17551867 		return -EPERM;
17561868 
1757
-	if (info->attrs[NBD_ATTR_INDEX])
1869
+	if (info->attrs[NBD_ATTR_INDEX]) {
17581870 		index = nla_get_u32(info->attrs[NBD_ATTR_INDEX]);
1871
+
1872
+		/*
1873
+		 * Too big first_minor can cause duplicate creation of
1874
+		 * sysfs files/links, since index << part_shift might overflow, or
1875
+		 * MKDEV() expect that the max bits of first_minor is 20.
1876
+		 */
1877
+		if (index < 0 || index > MINORMASK >> part_shift) {
1878
+			printk(KERN_ERR "nbd: illegal input index %d\n", index);
1879
+			return -EINVAL;
1880
+		}
1881
+	}
17591882 	if (!info->attrs[NBD_ATTR_SOCKETS]) {
17601883 		printk(KERN_ERR "nbd: must specify at least one socket\n");
17611884 		return -EINVAL;
....@@ -1796,6 +1919,17 @@
17961919 		mutex_unlock(&nbd_index_mutex);
17971920 		return -EINVAL;
17981921 	}
1922
+
1923
+	if (test_bit(NBD_DESTROY_ON_DISCONNECT, &nbd->flags) &&
1924
+	    test_bit(NBD_DISCONNECT_REQUESTED, &nbd->flags)) {
1925
+		nbd->destroy_complete = &destroy_complete;
1926
+		mutex_unlock(&nbd_index_mutex);
1927
+
1928
+		/* Wait untill the the nbd stuff is totally destroyed */
1929
+		wait_for_completion(&destroy_complete);
1930
+		goto again;
1931
+	}
1932
+
17991933 	if (!refcount_inc_not_zero(&nbd->refs)) {
18001934 		mutex_unlock(&nbd_index_mutex);
18011935 		if (index == -1)
....@@ -1820,37 +1954,24 @@
18201954 		nbd_put(nbd);
18211955 		return -EINVAL;
18221956 	}
1823
-	config = nbd->config = nbd_alloc_config();
1824
-	if (!nbd->config) {
1957
+	config = nbd_alloc_config();
1958
+	if (IS_ERR(config)) {
18251959 		mutex_unlock(&nbd->config_lock);
18261960 		nbd_put(nbd);
18271961 		printk(KERN_ERR "nbd: couldn't allocate config\n");
1828
-		return -ENOMEM;
1962
+		return PTR_ERR(config);
18291963 	}
1964
+	nbd->config = config;
18301965 	refcount_set(&nbd->config_refs, 1);
1831
-	set_bit(NBD_BOUND, &config->runtime_flags);
1966
+	set_bit(NBD_RT_BOUND, &config->runtime_flags);
18321967 
1833
-	if (info->attrs[NBD_ATTR_SIZE_BYTES]) {
1834
-		u64 bytes = nla_get_u64(info->attrs[NBD_ATTR_SIZE_BYTES]);
1835
-		nbd_size_set(nbd, config->blksize,
1836
-			     div64_u64(bytes, config->blksize));
1837
-	}
1838
-	if (info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]) {
1839
-		u64 bsize =
1840
-			nla_get_u64(info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]);
1841
-		if (!bsize)
1842
-			bsize = NBD_DEF_BLKSIZE;
1843
-		if (!nbd_is_valid_blksize(bsize)) {
1844
-			ret = -EINVAL;
1845
-			goto out;
1846
-		}
1847
-		nbd_size_set(nbd, bsize, div64_u64(config->bytesize, bsize));
1848
-	}
1849
-	if (info->attrs[NBD_ATTR_TIMEOUT]) {
1850
-		u64 timeout = nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT]);
1851
-		nbd->tag_set.timeout = timeout * HZ;
1852
-		blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ);
1853
-	}
1968
+	ret = nbd_genl_size_set(info, nbd);
1969
+	if (ret)
1970
+		goto out;
1971
+
1972
+	if (info->attrs[NBD_ATTR_TIMEOUT])
1973
+		nbd_set_cmd_timeout(nbd,
1974
+				    nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT]));
18541975 	if (info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]) {
18551976 		config->dead_conn_timeout =
18561977 			nla_get_u64(info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]);
....@@ -1862,12 +1983,24 @@
18621983 	if (info->attrs[NBD_ATTR_CLIENT_FLAGS]) {
18631984 		u64 flags = nla_get_u64(info->attrs[NBD_ATTR_CLIENT_FLAGS]);
18641985 		if (flags & NBD_CFLAG_DESTROY_ON_DISCONNECT) {
1865
-			set_bit(NBD_DESTROY_ON_DISCONNECT,
1866
-				&config->runtime_flags);
1867
-			put_dev = true;
1986
+			/*
1987
+			 * We have 1 ref to keep the device around, and then 1
1988
+			 * ref for our current operation here, which will be
1989
+			 * inherited by the config.  If we already have
1990
+			 * DESTROY_ON_DISCONNECT set then we know we don't have
1991
+			 * that extra ref already held so we don't need the
1992
+			 * put_dev.
1993
+			 */
1994
+			if (!test_and_set_bit(NBD_DESTROY_ON_DISCONNECT,
1995
+					      &nbd->flags))
1996
+				put_dev = true;
1997
+		} else {
1998
+			if (test_and_clear_bit(NBD_DESTROY_ON_DISCONNECT,
1999
+					       &nbd->flags))
2000
+				refcount_inc(&nbd->refs);
18682001 		}
18692002 		if (flags & NBD_CFLAG_DISCONNECT_ON_CLOSE) {
1870
-			set_bit(NBD_DISCONNECT_ON_CLOSE,
2003
+			set_bit(NBD_RT_DISCONNECT_ON_CLOSE,
18712004 				&config->runtime_flags);
18722005 		}
18732006 	}
....@@ -1885,8 +2018,10 @@
18852018 				ret = -EINVAL;
18862019 				goto out;
18872020 			}
1888
-			ret = nla_parse_nested(socks, NBD_SOCK_MAX, attr,
1889
-					       nbd_sock_policy, info->extack);
2021
+			ret = nla_parse_nested_deprecated(socks, NBD_SOCK_MAX,
2022
+							  attr,
2023
+							  nbd_sock_policy,
2024
+							  info->extack);
18902025 			if (ret != 0) {
18912026 				printk(KERN_ERR "nbd: error processing sock list\n");
18922027 				ret = -EINVAL;
....@@ -1904,7 +2039,7 @@
19042039 out:
19052040 	mutex_unlock(&nbd->config_lock);
19062041 	if (!ret) {
1907
-		set_bit(NBD_HAS_CONFIG_REF, &config->runtime_flags);
2042
+		set_bit(NBD_RT_HAS_CONFIG_REF, &config->runtime_flags);
19082043 		refcount_inc(&nbd->config_refs);
19092044 		nbd_connect_reply(info, nbd->index);
19102045 	}
....@@ -1918,15 +2053,21 @@
19182053 {
19192054 	mutex_lock(&nbd->config_lock);
19202055 	nbd_disconnect(nbd);
1921
-	nbd_clear_sock(nbd);
1922
-	mutex_unlock(&nbd->config_lock);
2056
+	sock_shutdown(nbd);
2057
+	wake_up(&nbd->config->conn_wait);
19232058 	/*
19242059 	 * Make sure recv thread has finished, so it does not drop the last
19252060 	 * config ref and try to destroy the workqueue from inside the work
1926
-	 * queue.
2061
+	 * queue. And this also ensure that we can safely call nbd_clear_que()
2062
+	 * to cancel the inflight I/Os.
19272063 	 */
1928
-	flush_workqueue(nbd->recv_workq);
1929
-	if (test_and_clear_bit(NBD_HAS_CONFIG_REF,
2064
+	if (nbd->recv_workq)
2065
+		flush_workqueue(nbd->recv_workq);
2066
+	nbd_clear_que(nbd);
2067
+	nbd->task_setup = NULL;
2068
+	mutex_unlock(&nbd->config_lock);
2069
+
2070
+	if (test_and_clear_bit(NBD_RT_HAS_CONFIG_REF,
19302071 			       &nbd->config->runtime_flags))
19312072 		nbd_config_put(nbd);
19322073 }
....@@ -2010,7 +2151,7 @@
20102151 
20112152 	mutex_lock(&nbd->config_lock);
20122153 	config = nbd->config;
2013
-	if (!test_bit(NBD_BOUND, &config->runtime_flags) ||
2154
+	if (!test_bit(NBD_RT_BOUND, &config->runtime_flags) ||
20142155 	    !nbd->task_recv) {
20152156 		dev_err(nbd_to_dev(nbd),
20162157 			"not configured, cannot reconfigure\n");
....@@ -2018,11 +2159,13 @@
20182159 		goto out;
20192160 	}
20202161 
2021
-	if (info->attrs[NBD_ATTR_TIMEOUT]) {
2022
-		u64 timeout = nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT]);
2023
-		nbd->tag_set.timeout = timeout * HZ;
2024
-		blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ);
2025
-	}
2162
+	ret = nbd_genl_size_set(info, nbd);
2163
+	if (ret)
2164
+		goto out;
2165
+
2166
+	if (info->attrs[NBD_ATTR_TIMEOUT])
2167
+		nbd_set_cmd_timeout(nbd,
2168
+				    nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT]));
20262169 	if (info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]) {
20272170 		config->dead_conn_timeout =
20282171 			nla_get_u64(info->attrs[NBD_ATTR_DEAD_CONN_TIMEOUT]);
....@@ -2032,19 +2175,19 @@
20322175 		u64 flags = nla_get_u64(info->attrs[NBD_ATTR_CLIENT_FLAGS]);
20332176 		if (flags & NBD_CFLAG_DESTROY_ON_DISCONNECT) {
20342177 			if (!test_and_set_bit(NBD_DESTROY_ON_DISCONNECT,
2035
-					      &config->runtime_flags))
2178
+					      &nbd->flags))
20362179 				put_dev = true;
20372180 		} else {
20382181 			if (test_and_clear_bit(NBD_DESTROY_ON_DISCONNECT,
2039
-					       &config->runtime_flags))
2182
+					       &nbd->flags))
20402183 				refcount_inc(&nbd->refs);
20412184 		}
20422185 
20432186 		if (flags & NBD_CFLAG_DISCONNECT_ON_CLOSE) {
2044
-			set_bit(NBD_DISCONNECT_ON_CLOSE,
2187
+			set_bit(NBD_RT_DISCONNECT_ON_CLOSE,
20452188 					&config->runtime_flags);
20462189 		} else {
2047
-			clear_bit(NBD_DISCONNECT_ON_CLOSE,
2190
+			clear_bit(NBD_RT_DISCONNECT_ON_CLOSE,
20482191 					&config->runtime_flags);
20492192 		}
20502193 	}
....@@ -2062,8 +2205,10 @@
20622205 				ret = -EINVAL;
20632206 				goto out;
20642207 			}
2065
-			ret = nla_parse_nested(socks, NBD_SOCK_MAX, attr,
2066
-					       nbd_sock_policy, info->extack);
2208
+			ret = nla_parse_nested_deprecated(socks, NBD_SOCK_MAX,
2209
+							  attr,
2210
+							  nbd_sock_policy,
2211
+							  info->extack);
20672212 			if (ret != 0) {
20682213 				printk(KERN_ERR "nbd: error processing sock list\n");
20692214 				ret = -EINVAL;
....@@ -2090,25 +2235,25 @@
20902235 	return ret;
20912236 }
20922237 
2093
-static const struct genl_ops nbd_connect_genl_ops[] = {
2238
+static const struct genl_small_ops nbd_connect_genl_ops[] = {
20942239 	{
20952240 		.cmd	= NBD_CMD_CONNECT,
2096
-		.policy	= nbd_attr_policy,
2241
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
20972242 		.doit	= nbd_genl_connect,
20982243 	},
20992244 	{
21002245 		.cmd	= NBD_CMD_DISCONNECT,
2101
-		.policy	= nbd_attr_policy,
2246
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
21022247 		.doit	= nbd_genl_disconnect,
21032248 	},
21042249 	{
21052250 		.cmd	= NBD_CMD_RECONFIGURE,
2106
-		.policy	= nbd_attr_policy,
2251
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
21072252 		.doit	= nbd_genl_reconfigure,
21082253 	},
21092254 	{
21102255 		.cmd	= NBD_CMD_STATUS,
2111
-		.policy	= nbd_attr_policy,
2256
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
21122257 		.doit	= nbd_genl_status,
21132258 	},
21142259 };
....@@ -2122,9 +2267,10 @@
21222267 	.name		= NBD_GENL_FAMILY_NAME,
21232268 	.version	= NBD_GENL_VERSION,
21242269 	.module		= THIS_MODULE,
2125
-	.ops		= nbd_connect_genl_ops,
2126
-	.n_ops		= ARRAY_SIZE(nbd_connect_genl_ops),
2270
+	.small_ops	= nbd_connect_genl_ops,
2271
+	.n_small_ops	= ARRAY_SIZE(nbd_connect_genl_ops),
21272272 	.maxattr	= NBD_ATTR_MAX,
2273
+	.policy = nbd_attr_policy,
21282274 	.mcgrps		= nbd_mcast_grps,
21292275 	.n_mcgrps	= ARRAY_SIZE(nbd_mcast_grps),
21302276 };
....@@ -2144,7 +2290,7 @@
21442290 	 */
21452291 	if (refcount_read(&nbd->config_refs))
21462292 		connected = 1;
2147
-	dev_opt = nla_nest_start(reply, NBD_DEVICE_ITEM);
2293
+	dev_opt = nla_nest_start_noflag(reply, NBD_DEVICE_ITEM);
21482294 	if (!dev_opt)
21492295 		return -EMSGSIZE;
21502296 	ret = nla_put_u32(reply, NBD_DEVICE_INDEX, nbd->index);
....@@ -2192,7 +2338,7 @@
21922338 		goto out;
21932339 	}
21942340 
2195
-	dev_list = nla_nest_start(reply, NBD_ATTR_DEVICE_LIST);
2341
+	dev_list = nla_nest_start_noflag(reply, NBD_ATTR_DEVICE_LIST);
21962342 	if (index == -1) {
21972343 		ret = idr_for_each(&nbd_index_idr, &status_cb, reply);
21982344 		if (ret) {
....@@ -2212,8 +2358,7 @@
22122358 	}
22132359 	nla_nest_end(reply, dev_list);
22142360 	genlmsg_end(reply, reply_head);
2215
-	genlmsg_reply(reply, info);
2216
-	ret = 0;
2361
+	ret = genlmsg_reply(reply, info);
22172362 out:
22182363 	mutex_unlock(&nbd_index_mutex);
22192364 	return ret;
....@@ -2337,6 +2482,12 @@
23372482 	struct nbd_device *nbd;
23382483 	LIST_HEAD(del_list);
23392484 
2485
+	/*
2486
+	 * Unregister netlink interface prior to waiting
2487
+	 * for the completion of netlink commands.
2488
+	 */
2489
+	genl_unregister_family(&nbd_genl_family);
2490
+
23402491 	nbd_dbg_close();
23412492 
23422493 	mutex_lock(&nbd_index_mutex);
....@@ -2346,13 +2497,15 @@
23462497 	while (!list_empty(&del_list)) {
23472498 		nbd = list_first_entry(&del_list, struct nbd_device, list);
23482499 		list_del_init(&nbd->list);
2500
+		if (refcount_read(&nbd->config_refs))
2501
+			printk(KERN_ERR "nbd: possibly leaking nbd_config (ref %d)\n",
2502
+					refcount_read(&nbd->config_refs));
23492503 		if (refcount_read(&nbd->refs) != 1)
23502504 			printk(KERN_ERR "nbd: possibly leaking a device\n");
23512505 		nbd_put(nbd);
23522506 	}
23532507 
23542508 	idr_destroy(&nbd_index_idr);
2355
-	genl_unregister_family(&nbd_genl_family);
23562509 	unregister_blkdev(NBD_MAJOR, "nbd");
23572510 }
23582511