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blk-mq: change blk_mq_queue_busy() to blk_mq_queue_inflight()

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There's a single user of this function, dm, and dm just wants
to check if IO is inflight, not that it's just allocated.

This fixes a hang with srp/002 in blktests with dm, where it tries
to suspend but waits for inflight IO to finish first. As it checks
for just allocated requests, this fails.

Tested-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-12-17 21:11:17 -07:00
parent e5edd5f298
commit 3c94d83cb3
3 changed files with 10 additions and 10 deletions
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16
block/blk-mq.c
View File

@ -805,14 +805,14 @@ struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag)
} }
EXPORT_SYMBOL(blk_mq_tag_to_rq); EXPORT_SYMBOL(blk_mq_tag_to_rq);
static bool blk_mq_check_busy(struct blk_mq_hw_ctx *hctx, struct request *rq, static bool blk_mq_rq_inflight(struct blk_mq_hw_ctx *hctx, struct request *rq,
void *priv, bool reserved) void *priv, bool reserved)
{ {
/* /*
* If we find a request, we know the queue is busy. Return false * If we find a request that is inflight and the queue matches,
* to stop the iteration. * we know the queue is busy. Return false to stop the iteration.
*/ */
if (rq->q == hctx->queue) { if (rq->state == MQ_RQ_IN_FLIGHT && rq->q == hctx->queue) {
bool *busy = priv; bool *busy = priv;
*busy = true; *busy = true;
@ -822,14 +822,14 @@ static bool blk_mq_check_busy(struct blk_mq_hw_ctx *hctx, struct request *rq,
return true; return true;
} }
bool blk_mq_queue_busy(struct request_queue *q) bool blk_mq_queue_inflight(struct request_queue *q)
{ {
bool busy = false; bool busy = false;
blk_mq_queue_tag_busy_iter(q, blk_mq_check_busy, &busy); blk_mq_queue_tag_busy_iter(q, blk_mq_rq_inflight, &busy);
return busy; return busy;
} }
EXPORT_SYMBOL_GPL(blk_mq_queue_busy); EXPORT_SYMBOL_GPL(blk_mq_queue_inflight);
static void blk_mq_rq_timed_out(struct request *req, bool reserved) static void blk_mq_rq_timed_out(struct request *req, bool reserved)
{ {

2
drivers/md/dm.c
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@ -663,7 +663,7 @@ static bool md_in_flight_bios(struct mapped_device *md)
static bool md_in_flight(struct mapped_device *md) static bool md_in_flight(struct mapped_device *md)
{ {
if (queue_is_mq(md->queue)) if (queue_is_mq(md->queue))
return blk_mq_queue_busy(md->queue); return blk_mq_queue_inflight(md->queue);
else else
return md_in_flight_bios(md); return md_in_flight_bios(md);
} }

2
include/linux/blk-mq.h
View File

@ -257,7 +257,7 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
void blk_mq_free_request(struct request *rq); void blk_mq_free_request(struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *); bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
bool blk_mq_queue_busy(struct request_queue *q); bool blk_mq_queue_inflight(struct request_queue *q);
enum { enum {
/* return when out of requests */ /* return when out of requests */