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Commit b41c9b02 authored by Eric Wheeler's avatar Eric Wheeler Committed by Jens Axboe
Browse files

bcache: update bio->bi_opf bypass/writeback REQ_ flag hints 



Flag for bypass if the IO is for read-ahead or background, unless the
read-ahead request is for metadata (eg, from gfs2).
        Bypass if:
                bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) &&
			!(bio->bi_opf & REQ_META))

        Writeback if:
                op_is_sync(bio->bi_opf) ||
			bio->bi_opf & (REQ_META|REQ_PRIO)

Signed-off-by: default avatarEric Wheeler <bcache@linux.ewheeler.net>
Reviewed-by: default avatarColy Li <colyli@suse.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e89d6759

drivers/md/bcache/request.c

+8 −0
Original line number Diff line number Diff line
@@ -384,6 +384,14 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio) 
	     op_is_write(bio_op(bio))))

		goto skip;



	/*

	 * Flag for bypass if the IO is for read-ahead or background,

	 * unless the read-ahead request is for metadata (eg, for gfs2).

	 */

	if (bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) &&

	    !(bio->bi_opf & REQ_META))

		goto skip;



	if (bio->bi_iter.bi_sector & (c->sb.block_size - 1) ||

	    bio_sectors(bio) & (c->sb.block_size - 1)) {

		pr_debug("skipping unaligned io");

drivers/md/bcache/writeback.h

+3 −1
Original line number Diff line number Diff line
@@ -76,7 +76,9 @@ static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, 
	if (would_skip)

		return false;



	return op_is_sync(bio->bi_opf) || in_use <= CUTOFF_WRITEBACK;

	return (op_is_sync(bio->bi_opf) ||

		bio->bi_opf & (REQ_META|REQ_PRIO) ||

		in_use <= CUTOFF_WRITEBACK);

}



static inline void bch_writeback_queue(struct cached_dev *dc)