bcache: use REQ_PRIO to indicate bio for metadata

In cached_dev_cache_miss() and check_should_bypass(), REQ_META is used
to check whether a bio is for metadata request. REQ_META is used for
blktrace, the correct REQ_ flag should be REQ_PRIO. This flag means the
bio should be prior to other bio, and frequently be used to indicate
metadata io in file system code.

This patch replaces REQ_META with correct flag REQ_PRIO.

CC Adam Manzanares because he explains to me what REQ_PRIO is for.

Signed-off-by: Coly Li <colyli@suse.de>
Cc: Adam Manzanares <adam.manzanares@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 4946d486f734..ee15fb039fd0 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -395,7 +395,7 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
          * unless the read-ahead request is for metadata (eg, for gfs2).
          */
         if (bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) &&
-            !(bio->bi_opf & REQ_META))
+            !(bio->bi_opf & REQ_PRIO))
                 goto skip;
 
         if (bio->bi_iter.bi_sector & (c->sb.block_size - 1) ||
@@ -877,7 +877,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
         }
 
         if (!(bio->bi_opf & REQ_RAHEAD) &&
-            !(bio->bi_opf & REQ_META) &&
+            !(bio->bi_opf & REQ_PRIO) &&
             s->iop.c->gc_stats.in_use < CUTOFF_CACHE_READA)
                 reada = min_t(sector_t, dc->readahead >> 9,
                               get_capacity(bio->bi_disk) - bio_end_sector(bio));