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>
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index e152d98..5a7f73f 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1690,7 +1690,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
/* Full snapshots are not usable */
/* To get here the table must be live so s->active is always set. */
if (!s->valid)
- return -EIO;
+ return DM_MAPIO_KILL;
/* FIXME: should only take write lock if we need
* to copy an exception */
@@ -1698,7 +1698,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
if (!s->valid || (unlikely(s->snapshot_overflowed) &&
bio_data_dir(bio) == WRITE)) {
- r = -EIO;
+ r = DM_MAPIO_KILL;
goto out_unlock;
}
@@ -1723,7 +1723,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
if (!s->valid || s->snapshot_overflowed) {
free_pending_exception(pe);
- r = -EIO;
+ r = DM_MAPIO_KILL;
goto out_unlock;
}
@@ -1741,7 +1741,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
DMERR("Snapshot overflowed: Unable to allocate exception.");
} else
__invalidate_snapshot(s, -ENOMEM);
- r = -EIO;
+ r = DM_MAPIO_KILL;
goto out_unlock;
}
}