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

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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: Eric Wheeler <bcache@linux.ewheeler.net>
Reviewed-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Eric Wheeler 2017-10-13 16:35:33 -07:00 committed by Jens Axboe
parent e89d67596e
commit b41c9b0266
2 changed files with 11 additions and 1 deletions
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8
drivers/md/bcache/request.c
View file

@ -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");

4
drivers/md/bcache/writeback.h
View file

@ -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)