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authorKeith Busch <kbusch@kernel.org>2021-06-11 00:44:34 +0300
committerJens Axboe <axboe@kernel.dk>2021-07-01 00:34:21 +0300
commitc01b5a814e7b28e327883838bad159194bdd68e8 (patch)
tree47668dda356db6bc03ddcaad5137a510745f1721 /block
parentda6269da4cfe29f484e8fd27c1496b81b47e2499 (diff)
downloadlinux-c01b5a814e7b28e327883838bad159194bdd68e8.tar.xz
block: support polling through blk_execute_rq
Poll for completions if the request's hctx is a polling type. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Link: https://lore.kernel.org/r/20210610214437.641245-2-kbusch@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-exec.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/block/blk-exec.c b/block/blk-exec.c
index beae70a0e5e5..38f88552aa31 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -63,6 +63,19 @@ void blk_execute_rq_nowait(struct gendisk *bd_disk, struct request *rq,
}
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
* @bd_disk: matching gendisk
@@ -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 */
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)));
else
wait_for_completion_io(&wait);