dm: implement REQ_FLUSH/FUA support for bio-based dm

[pandora-kernel.git] / drivers / md / dm-snap.c

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 5974d30..eed2101 100644 (file)
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1587,7 +1587,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
        chunk_t chunk;
        struct dm_snap_pending_exception *pe = NULL;
 
-       if (unlikely(bio_empty_barrier(bio))) {
+       if (bio->bi_rw & REQ_FLUSH) {
                bio->bi_bdev = s->cow->bdev;
                return DM_MAPIO_REMAPPED;
        }
@@ -1691,7 +1691,7 @@ static int snapshot_merge_map(struct dm_target *ti, struct bio *bio,
        int r = DM_MAPIO_REMAPPED;
        chunk_t chunk;
 
-       if (unlikely(bio_empty_barrier(bio))) {
+       if (bio->bi_rw & REQ_FLUSH) {
                if (!map_context->target_request_nr)
                        bio->bi_bdev = s->origin->bdev;
                else
@@ -2135,7 +2135,7 @@ static int origin_map(struct dm_target *ti, struct bio *bio,
        struct dm_dev *dev = ti->private;
        bio->bi_bdev = dev->bdev;
 
-       if (unlikely(bio_empty_barrier(bio)))
+       if (bio->bi_rw & REQ_FLUSH)
                return DM_MAPIO_REMAPPED;
 
        /* Only tell snapshots if this is a write */