linux-kernel - [PATCH AUTOSEL 5.4 16/23] nbd: restore default timeout when setting it to zero

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200831153039.1024302-16-sashal@kernel.org>
Date:   Mon, 31 Aug 2020 11:30:32 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hou Pu <houpu@...edance.com>, Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>,
        linux-block@...r.kernel.org, nbd@...er.debian.org
Subject: [PATCH AUTOSEL 5.4 16/23] nbd: restore default timeout when setting it to zero

From: Hou Pu <houpu@...edance.com>

[ Upstream commit acb19e17c5134dd78668c429ecba5b481f038e6a ]

If we configured io timeout of nbd0 to 100s. Later after we
finished using it, we configured nbd0 again and set the io
timeout to 0. We expect it would timeout after 30 seconds
and keep retry. But in fact we could not change the timeout
when we set it to 0. the timeout is still the original 100s.

So change the timeout to default 30s when we set it to zero.
It also behaves same as commit 2da22da57348 ("nbd: fix zero
cmd timeout handling v2").

It becomes more important if we were reconfigure a nbd device
and the io timeout it set to zero. Because it could take 30s
to detect the new socket and thus io could be completed more
quickly compared to 100s.

Signed-off-by: Hou Pu <houpu@...edance.com>
Reviewed-by: Josef Bacik <josef@...icpanda.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/nbd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 7b61d53ba050e..7c577cabb9c3b 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1349,6 +1349,8 @@ static void nbd_set_cmd_timeout(struct nbd_device *nbd, u64 timeout)
 	nbd->tag_set.timeout = timeout * HZ;
 	if (timeout)
 		blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ);
+	else
+		blk_queue_rq_timeout(nbd->disk->queue, 30 * HZ);
 }

 /* Must be called with config_lock held */
-- 
2.25.1