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| author | Hou Pu <houpu.main@gmail.com> | 2020-02-28 01:40:30 -0500 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-03-12 08:01:24 -0600 |
| commit | 2c272542baee2c3b9e8e3a260db81227ccefe8b5 (patch) | |
| tree | e6803e9f379d145c192eb658978ed163638b072d /drivers/block | |
| parent | d970958b2d24e9a40b685ad82bf26a291d6f1c25 (diff) | |
| download | linux-2c272542baee2c3b9e8e3a260db81227ccefe8b5.tar.bz2 | |
nbd: requeue command if the soecket is changed
In commit 2da22da5734 (nbd: fix zero cmd timeout handling v2),
it is allowed to reset timer when it fires if tag_set.timeout
is set to zero. If the server is shutdown and a new socket
is reconfigured, the request should be requeued to be processed by
new server instead of waiting for response from the old one.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Hou Pu <houpu@bytedance.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/nbd.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 83070714888b..43cff01a5a67 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -434,12 +434,22 @@ static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req, * Userspace sets timeout=0 to disable socket disconnection, * so just warn and reset the timer. */ + struct nbd_sock *nsock = config->socks[cmd->index]; cmd->retries++; dev_info(nbd_to_dev(nbd), "Possible stuck request %p: control (%s@%llu,%uB). Runtime %u seconds\n", req, nbdcmd_to_ascii(req_to_nbd_cmd_type(req)), (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req), (req->timeout / HZ) * cmd->retries); + mutex_lock(&nsock->tx_lock); + if (cmd->cookie != nsock->cookie) { + nbd_requeue_cmd(cmd); + mutex_unlock(&nsock->tx_lock); + mutex_unlock(&cmd->lock); + nbd_config_put(nbd); + return BLK_EH_DONE; + } + mutex_unlock(&nsock->tx_lock); mutex_unlock(&cmd->lock); nbd_config_put(nbd); return BLK_EH_RESET_TIMER; |