Commit c01b5a81 authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe

block: support polling through blk_execute_rq

Poll for completions if the request's hctx is a polling type.
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
Reviewed-by: default avatarChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Link: https://lore.kernel.org/r/20210610214437.641245-2-kbusch@kernel.orgSigned-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent da6269da
...@@ -63,6 +63,19 @@ void blk_execute_rq_nowait(struct gendisk *bd_disk, struct request *rq, ...@@ -63,6 +63,19 @@ void blk_execute_rq_nowait(struct gendisk *bd_disk, struct request *rq,
} }
EXPORT_SYMBOL_GPL(blk_execute_rq_nowait); EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
static bool blk_rq_is_poll(struct request *rq)
{
return rq->mq_hctx && rq->mq_hctx->type == HCTX_TYPE_POLL;
}
static void blk_rq_poll_completion(struct request *rq, struct completion *wait)
{
do {
blk_poll(rq->q, request_to_qc_t(rq->mq_hctx, rq), true);
cond_resched();
} while (!completion_done(wait));
}
/** /**
* blk_execute_rq - insert a request into queue for execution * blk_execute_rq - insert a request into queue for execution
* @bd_disk: matching gendisk * @bd_disk: matching gendisk
...@@ -83,7 +96,10 @@ void blk_execute_rq(struct gendisk *bd_disk, struct request *rq, int at_head) ...@@ -83,7 +96,10 @@ void blk_execute_rq(struct gendisk *bd_disk, struct request *rq, int at_head)
/* Prevent hang_check timer from firing at us during very long I/O */ /* Prevent hang_check timer from firing at us during very long I/O */
hang_check = sysctl_hung_task_timeout_secs; hang_check = sysctl_hung_task_timeout_secs;
if (hang_check)
if (blk_rq_is_poll(rq))
blk_rq_poll_completion(rq, &wait);
else if (hang_check)
while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2))); while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
else else
wait_for_completion_io(&wait); wait_for_completion_io(&wait);
......
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