linux-kernel - [PATCH] nbd: ratelimit error messages from disconnected devices

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Message-Id: <1455618781-26306-1-git-send-email-dmonakhov@openvz.org>
Date:	Tue, 16 Feb 2016 14:33:01 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	nbd-general@...ts.sourceforge.net,
	Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH] nbd: ratelimit error messages from disconnected devices

ndb can be explicitly disconnected via NBD_DISCONNECT while
active user still exists this result in massive spam to logs.
Let's ratelimits such messages.

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 drivers/block/nbd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index e4c5cc1..2dbe840 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -175,7 +175,7 @@ static int sock_xmit(struct nbd_device *nbd, int send, void *buf, int size,
 	unsigned long pflags = current->flags;
 
 	if (unlikely(!sock)) {
-		dev_err(disk_to_dev(nbd->disk),
+		dev_err_ratelimited(disk_to_dev(nbd->disk),
 			"Attempted %s on closed socket in sock_xmit\n",
 			(send ? "send" : "recv"));
 		return -EINVAL;
@@ -509,7 +509,7 @@ static void nbd_handle_req(struct nbd_device *nbd, struct request *req)
 	mutex_lock(&nbd->tx_lock);
 	if (unlikely(!nbd->sock)) {
 		mutex_unlock(&nbd->tx_lock);
-		dev_err(disk_to_dev(nbd->disk),
+		dev_err_ratelimited(disk_to_dev(nbd->disk),
 			"Attempted send on closed socket\n");
 		goto error_out;
 	}
@@ -618,7 +618,7 @@ static void nbd_request_handler(struct request_queue *q)
 			req, req->cmd_type);
 
 		if (unlikely(!nbd->sock)) {
-			dev_err(disk_to_dev(nbd->disk),
+			dev_err_ratelimited(disk_to_dev(nbd->disk),
 				"Attempted send on closed socket\n");
 			req->errors++;
 			nbd_end_request(nbd, req);
-- 
1.8.3.1