Commit cb700eb3 authored by Jens Axboe's avatar Jens Axboe
Browse files

block: don't plug for aio/O_DIRECT HIPRI IO 



Those will go straight to issue inside blk-mq, so don't bother
setting up a block plug for them.

Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent d34513d3

fs/block_dev.c

+11 −2
Original line number Diff line number Diff line
@@ -330,6 +330,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) 
	struct blk_plug plug;

	struct blkdev_dio *dio;

	struct bio *bio;

	bool is_poll = (iocb->ki_flags & IOCB_HIPRI) != 0;

	bool is_read = (iov_iter_rw(iter) == READ), is_sync;

	loff_t pos = iocb->ki_pos;

	blk_qc_t qc = BLK_QC_T_NONE;
@@ -353,7 +354,13 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) 
	dio->multi_bio = false;

	dio->should_dirty = is_read && iter_is_iovec(iter);



	/*

	 * Don't plug for HIPRI/polled IO, as those should go straight

	 * to issue

	 */

	if (!is_poll)

		blk_start_plug(&plug);



	for (;;) {

		bio_set_dev(bio, bdev);

		bio->bi_iter.bi_sector = pos >> 9;
@@ -400,6 +407,8 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) 
		submit_bio(bio);

		bio = bio_alloc(GFP_KERNEL, nr_pages);

	}



	if (!is_poll)

		blk_finish_plug(&plug);



	if (!is_sync)

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