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| author |   Xie Yongji <xieyongji@bytedance.com> | 2022-03-22 16:06:39 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2022-05-16 06:19:35 -0600 |
| commit | 491bf8f236fdeec698fa6744993f1ecf3fafd1a5 (patch) | |
| tree | 5c311265ed0616e3909fba381842336c50d1cb87 /drivers/block/nbd.c | |
| parent | loop: remove most the top-of-file boilerplate comment from the UAPI header (diff) | |
| download | linux-dev-491bf8f236fdeec698fa6744993f1ecf3fafd1a5.tar.xz linux-dev-491bf8f236fdeec698fa6744993f1ecf3fafd1a5.zip | |
nbd: Fix hung on disconnect request if socket is closed before
When userspace closes the socket before sending a disconnect
request, the following I/O requests will be blocked in
wait_for_reconnect() until dead timeout. This will cause the
following disconnect request also hung on blk_mq_quiesce_queue().
That means we have no way to disconnect a nbd device if there
are some I/O requests waiting for reconnecting until dead timeout.
It's not expected. So let's wake up the thread waiting for
reconnecting directly when a disconnect request is sent.
Reported-by: Xu Jianhai <zero.xu@bytedance.com>
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/20220322080639.142-1-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/nbd.c')
| -rw-r--r-- | drivers/block/nbd.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index fd1501f81b34..ac8b045c777c 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -946,11 +946,15 @@ static int wait_for_reconnect(struct nbd_device *nbd) struct nbd_config *config = nbd->config; if (!config->dead_conn_timeout) return 0; - if (test_bit(NBD_RT_DISCONNECTED, &config->runtime_flags)) + + if (!wait_event_timeout(config->conn_wait, + test_bit(NBD_RT_DISCONNECTED, + &config->runtime_flags) || + atomic_read(&config->live_connections) > 0, + config->dead_conn_timeout)) return 0; - return wait_event_timeout(config->conn_wait, - atomic_read(&config->live_connections) > 0, - config->dead_conn_timeout) > 0; + + return !test_bit(NBD_RT_DISCONNECTED, &config->runtime_flags); } static int nbd_handle_cmd(struct nbd_cmd *cmd, int index) @@ -2076,6 +2080,7 @@ static void nbd_disconnect_and_put(struct nbd_device *nbd) mutex_lock(&nbd->config_lock); nbd_disconnect(nbd); sock_shutdown(nbd); + wake_up(&nbd->config->conn_wait); /* * Make sure recv thread has finished, we can safely call nbd_clear_que() * to cancel the inflight I/Os. |