dm: linear support flush
Flush support for the linear target.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 79fb53e..ecbb174 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -53,6 +53,7 @@
goto bad;
}
+ ti->num_flush_requests = 1;
ti->private = lc;
return 0;
@@ -81,7 +82,8 @@
struct linear_c *lc = ti->private;
bio->bi_bdev = lc->dev->bdev;
- bio->bi_sector = linear_map_sector(ti, bio->bi_sector);
+ if (bio_sectors(bio))
+ bio->bi_sector = linear_map_sector(ti, bio->bi_sector);
}
static int linear_map(struct dm_target *ti, struct bio *bio,