[PATCH 3/5] nbd: Timeouts are not user requested disconnects

From: Markus Pargmann
Date: Sat Jan 02 2016 - 05:17:25 EST


It may be useful to know in the client that a connection timed out. The
current code returns success for a timeout.

This patch reports the error code -ETIMEDOUT for a timeout.

Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
---
drivers/block/nbd.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 88762f640527..0ba3149c48bb 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -57,6 +57,7 @@ struct nbd_device {
int blksize;
loff_t bytesize;
int xmit_timeout;
+ bool timedout;
bool disconnect; /* a disconnect has been requested by user */

struct timer_list timeout_timer;
@@ -154,10 +155,9 @@ static void nbd_xmit_timeout(unsigned long arg)
if (list_empty(&nbd->queue_head))
return;

- nbd->disconnect = true;
-
spin_lock_irqsave(&nbd->sock_lock, flags);

+ nbd->timedout = true;

if (nbd->sock)
kernel_sock_shutdown(nbd->sock, SHUT_RDWR);
@@ -754,7 +754,10 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
if (max_part > 0)
blkdev_reread_part(bdev);
if (nbd->disconnect) /* user requested, ignore socket errors */
- return 0;
+ error = 0;
+ if (nbd->timedout)
+ error = -ETIMEDOUT;
+
return error;
}

--
2.6.2

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