[PATCH 7/9] dm: Add nowait support to raid1

[Goldwyn Rodrigues <rgoldwyn@suse.de>]

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

If the I/O would block because the devices are syncing, bail.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 drivers/md/dm-raid1.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index a4fbd911d566..446ac581627f 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1219,6 +1219,11 @@ static int mirror_map(struct dm_target *ti, struct bio *bio)
 		if (bio->bi_opf & REQ_RAHEAD)
 			return DM_MAPIO_KILL;
 
+		if (bio->bi_opf & REQ_NOWAIT) {
+			bio_wouldblock_error(bio);
+			return DM_MAPIO_SUBMITTED;
+		}
+
 		queue_bio(ms, bio, rw);
 		return DM_MAPIO_SUBMITTED;
 	}
-- 
2.12.3