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blk-mq: when polling for IO, look for any completion

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If we want to support async IO polling, then we have to allow finding
completions that aren't just for the one we are looking for. Always pass
in -1 to the mq_ops->poll() helper, and have that return how many events
were found in this poll loop.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2018-11-26 08:21:49 -07:00
parent 1db4909e76
commit 1052b8ac52
5 changed files with 70 additions and 69 deletions
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include/linux/blkdev.h
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@@ -867,7 +867,7 @@ extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
int blk_status_to_errno(blk_status_t status);
blk_status_t errno_to_blk_status(int errno);
bool blk_poll(struct request_queue *q, blk_qc_t cookie);
int blk_poll(struct request_queue *q, blk_qc_t cookie);
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
{