Commit dd37eba1 authored by Dan Streetman's avatar Dan Streetman Committed by Ben Hutchings

nbd: ratelimit error msgs after socket close

commit da6ccaaa upstream.

Make the "Attempted send on closed socket" error messages generated in
nbd_request_handler() ratelimited.

When the nbd socket is shutdown, the nbd_request_handler() function emits
an error message for every request remaining in its queue.  If the queue
is large, this will spam a large amount of messages to the log.  There's
no need for a separate error message for each request, so this patch
ratelimits it.

In the specific case this was found, the system was virtual and the error
messages were logged to the serial port, which overwhelmed it.

Fixes: 4d48a542 ("nbd: fix I/O hang on disconnected nbds")
Signed-off-by: default avatarDan Streetman <dan.streetman@canonical.com>
Signed-off-by: default avatarMarkus Pargmann <mpa@pengutronix.de>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 1d572520
...@@ -578,7 +578,7 @@ static void do_nbd_request(struct request_queue *q) ...@@ -578,7 +578,7 @@ static void do_nbd_request(struct request_queue *q)
BUG_ON(nbd->magic != NBD_MAGIC); BUG_ON(nbd->magic != NBD_MAGIC);
if (unlikely(!nbd->sock)) { 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"); "Attempted send on closed socket\n");
req->errors++; req->errors++;
nbd_end_request(req); nbd_end_request(req);
......
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