blk-mq: unshared timeout handler
Duplicate the (small) timeout handler in blk-mq so that we can pass
arguments more easily to the driver timeout handler. This enables
the next patch.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3baebca..298d6e3 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -525,9 +525,15 @@
}
EXPORT_SYMBOL(blk_mq_tag_to_rq);
-static enum blk_eh_timer_return blk_mq_rq_timed_out(struct request *rq)
+struct blk_mq_timeout_data {
+ unsigned long next;
+ unsigned int next_set;
+};
+
+static void blk_mq_rq_timed_out(struct request *req)
{
- struct request_queue *q = rq->q;
+ struct blk_mq_ops *ops = req->q->mq_ops;
+ enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER;
/*
* We know that complete is set at this point. If STARTED isn't set
@@ -538,27 +544,43 @@
* we both flags will get cleared. So check here again, and ignore
* a timeout event with a request that isn't active.
*/
- if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
- return BLK_EH_NOT_HANDLED;
+ if (!test_bit(REQ_ATOM_STARTED, &req->atomic_flags))
+ return;
- if (!q->mq_ops->timeout)
- return BLK_EH_RESET_TIMER;
+ if (ops->timeout)
+ ret = ops->timeout(req);
- return q->mq_ops->timeout(rq);
+ switch (ret) {
+ case BLK_EH_HANDLED:
+ __blk_mq_complete_request(req);
+ break;
+ case BLK_EH_RESET_TIMER:
+ blk_add_timer(req);
+ blk_clear_rq_complete(req);
+ break;
+ case BLK_EH_NOT_HANDLED:
+ break;
+ default:
+ printk(KERN_ERR "block: bad eh return: %d\n", ret);
+ break;
+ }
}
-struct blk_mq_timeout_data {
- unsigned long next;
- unsigned int next_set;
-};
-
static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx,
struct request *rq, void *priv, bool reserved)
{
struct blk_mq_timeout_data *data = priv;
- if (test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
- blk_rq_check_expired(rq, &data->next, &data->next_set);
+ if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
+ return;
+
+ if (time_after_eq(jiffies, rq->deadline)) {
+ if (!blk_mark_rq_complete(rq))
+ blk_mq_rq_timed_out(rq);
+ } else if (!data->next_set || time_after(data->next, rq->deadline)) {
+ data->next = rq->deadline;
+ data->next_set = 1;
+ }
}
static void blk_mq_rq_timer(unsigned long priv)
@@ -1781,7 +1803,6 @@
else
blk_queue_make_request(q, blk_sq_make_request);
- blk_queue_rq_timed_out(q, blk_mq_rq_timed_out);
if (set->timeout)
blk_queue_rq_timeout(q, set->timeout);