linux-kernel - [PATCH 3/3] nbd: mark sock as dead even if it's the last one

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Date:   Fri, 24 May 2019 17:43:56 +0800
From:   Yao Liu <yotta.liu@...oud.cn>
To:     Josef Bacik <josef@...icpanda.com>, Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, nbd@...er.debian.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] nbd: mark sock as dead even if it's the last one

When sock dead, nbd_read_stat should return a ERR_PTR and then we should
mark sock as dead and wait for a reconnection if the dead sock is the last
one, because nbd_xmit_timeout won't resubmit while num_connections <= 1.

Signed-off-by: Yao Liu <yotta.liu@...oud.cn>
---
 drivers/block/nbd.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 22e86f4..a557a83 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -716,15 +716,7 @@ static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd, int index)
 			if (result <= 0) {
 				dev_err(disk_to_dev(nbd->disk), "Receive data failed (result %d)\n",
 					result);
-				/*
-				 * If we've disconnected or we only have 1
-				 * connection then we need to make sure we
-				 * complete this request, otherwise error out
-				 * and let the timeout stuff handle resubmitting
-				 * this request onto another connection.
-				 */
-				if (nbd_disconnected(config) ||
-				    config->num_connections <= 1) {
+				if (nbd_disconnected(config)) {
 					cmd->status = BLK_STS_IOERR;
 					goto out;
 				}
-- 
1.8.3.1