diff options
Diffstat (limited to 'block/blk-timeout.c')
| -rw-r--r-- | block/blk-timeout.c | 60 |
1 files changed, 36 insertions, 24 deletions
diff --git a/block/blk-timeout.c b/block/blk-timeout.c index d96f7061c6fd..95a09590ccfd 100644 --- a/block/blk-timeout.c +++ b/block/blk-timeout.c @@ -96,11 +96,7 @@ static void blk_rq_timed_out(struct request *req) __blk_complete_request(req); break; case BLK_EH_RESET_TIMER: - if (q->mq_ops) - blk_mq_add_timer(req); - else - blk_add_timer(req); - + blk_add_timer(req); blk_clear_rq_complete(req); break; case BLK_EH_NOT_HANDLED: @@ -170,7 +166,26 @@ void blk_abort_request(struct request *req) } EXPORT_SYMBOL_GPL(blk_abort_request); -void __blk_add_timer(struct request *req, struct list_head *timeout_list) +unsigned long blk_rq_timeout(unsigned long timeout) +{ + unsigned long maxt; + + maxt = round_jiffies_up(jiffies + BLK_MAX_TIMEOUT); + if (time_after(timeout, maxt)) + timeout = maxt; + + return timeout; +} + +/** + * blk_add_timer - Start timeout timer for a single request + * @req: request that is about to start running. + * + * Notes: + * Each request has its own timer, and as it is added to the queue, we + * set up the timer. When the request completes, we cancel the timer. + */ +void blk_add_timer(struct request *req) { struct request_queue *q = req->q; unsigned long expiry; @@ -188,32 +203,29 @@ void __blk_add_timer(struct request *req, struct list_head *timeout_list) req->timeout = q->rq_timeout; req->deadline = jiffies + req->timeout; - if (timeout_list) - list_add_tail(&req->timeout_list, timeout_list); + if (!q->mq_ops) + list_add_tail(&req->timeout_list, &req->q->timeout_list); /* * If the timer isn't already pending or this timeout is earlier * than an existing one, modify the timer. Round up to next nearest * second. */ - expiry = round_jiffies_up(req->deadline); + expiry = blk_rq_timeout(round_jiffies_up(req->deadline)); if (!timer_pending(&q->timeout) || - time_before(expiry, q->timeout.expires)) - mod_timer(&q->timeout, expiry); + time_before(expiry, q->timeout.expires)) { + unsigned long diff = q->timeout.expires - expiry; -} + /* + * Due to added timer slack to group timers, the timer + * will often be a little in front of what we asked for. + * So apply some tolerance here too, otherwise we keep + * modifying the timer because expires for value X + * will be X + something. + */ + if (!timer_pending(&q->timeout) || (diff >= HZ / 2)) + mod_timer(&q->timeout, expiry); + } -/** - * blk_add_timer - Start timeout timer for a single request - * @req: request that is about to start running. - * - * Notes: - * Each request has its own timer, and as it is added to the queue, we - * set up the timer. When the request completes, we cancel the timer. - */ -void blk_add_timer(struct request *req) -{ - __blk_add_timer(req, &req->q->timeout_list); } - |