diff options
| author | Eric Wheeler <bcache@linux.ewheeler.net> | 2017-10-14 02:35:33 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-10-16 18:07:26 +0300 |
| commit | b41c9b0266e8370033a7799f6806bfc70b7fd75f (patch) | |
| tree | 0c2aa53a2c267290dae162b6573ab0f74d73194d | |
| parent | e89d67596e202119ea846cc997f4cf75cb284490 (diff) | |
| download | linux-b41c9b0266e8370033a7799f6806bfc70b7fd75f.tar.xz | |
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: Eric Wheeler <bcache@linux.ewheeler.net>
Reviewed-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/md/bcache/request.c | 8 | ||||
| -rw-r--r-- | drivers/md/bcache/writeback.h | 4 |
2 files changed, 11 insertions, 1 deletions
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c index 681b4f12b05a..9ee137e8d387 100644 --- a/drivers/md/bcache/request.c +++ b/drivers/md/bcache/request.c @@ -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"); diff --git a/drivers/md/bcache/writeback.h b/drivers/md/bcache/writeback.h index e35421d20d2e..34bcf49d737b 100644 --- a/drivers/md/bcache/writeback.h +++ b/drivers/md/bcache/writeback.h @@ -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) |