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-rw-r--r--drivers/md/dm-snap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 7e691ab9a74..594d1f6b478 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -777,7 +777,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
/* Full snapshots are not usable */
if (!s->valid)
- return -1;
+ return -EIO;
/*
* Write to snapshot - higher level takes care of RW/RO