diff options
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/nbd.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index ebc98cf76365..98c618e5732c 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -121,6 +121,7 @@ struct nbd_cmd { struct mutex lock; int index; int cookie; + int retries; blk_status_t status; unsigned long flags; u32 cmd_cookie; @@ -407,10 +408,25 @@ static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req, nbd_config_put(nbd); return BLK_EH_DONE; } - } else { - dev_err_ratelimited(nbd_to_dev(nbd), - "Connection timed out\n"); } + + if (!nbd->tag_set.timeout) { + /* + * Userspace sets timeout=0 to disable socket disconnection, + * so just warn and reset the timer. + */ + 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_unlock(&cmd->lock); + nbd_config_put(nbd); + return BLK_EH_RESET_TIMER; + } + + dev_err_ratelimited(nbd_to_dev(nbd), "Connection timed out\n"); set_bit(NBD_TIMEDOUT, &config->runtime_flags); cmd->status = BLK_STS_IOERR; mutex_unlock(&cmd->lock); @@ -531,6 +547,7 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index) } cmd->index = index; cmd->cookie = nsock->cookie; + cmd->retries = 0; request.type = htonl(type | nbd_cmd_flags); if (type != NBD_CMD_FLUSH) { request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9); @@ -1254,7 +1271,8 @@ static bool nbd_is_valid_blksize(unsigned long blksize) static void nbd_set_cmd_timeout(struct nbd_device *nbd, u64 timeout) { nbd->tag_set.timeout = timeout * HZ; - blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ); + if (timeout) + blk_queue_rq_timeout(nbd->disk->queue, timeout * HZ); } /* Must be called with config_lock held */ @@ -1287,8 +1305,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, nbd_size_set(nbd, config->blksize, arg); return 0; case NBD_SET_TIMEOUT: - if (arg) - nbd_set_cmd_timeout(nbd, arg); + nbd_set_cmd_timeout(nbd, arg); return 0; case NBD_SET_FLAGS: |