dm: don't return errnos from ->map

Instead use the special DM_MAPIO_KILL return value to return -EIO just
like we do for the request based path.  Note that dm-log-writes returned
-ENOMEM in a few places, which now becomes -EIO instead.  No consumer
treats -ENOMEM special so this shouldn't be an issue (and it should
use a mempool to start with to make guaranteed progress).

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 13305a182611..e8f093b323ce 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -321,7 +321,7 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
                 if (bio_data_dir(bio) == READ) {
                         if (!fc->corrupt_bio_byte && !test_bit(DROP_WRITES, &fc->flags) &&
                             !test_bit(ERROR_WRITES, &fc->flags))
-                                return -EIO;
+                                return DM_MAPIO_KILL;
                         goto map_bio;
                 }
 
@@ -349,7 +349,7 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
                 /*
                  * By default, error all I/O.
                  */
-                return -EIO;
+                return DM_MAPIO_KILL;
         }
 
 map_bio: