dm snapshot: don't define direct_access if we don't support it

Don't define a direct_access function that fails, dm_dax_direct_access
already fails with -EIO if the pointer is zero;

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 36805b1..a168963 100644 (file)
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -2338,13 +2338,6 @@ static int origin_map(struct dm_target *ti, struct bio *bio)
        return do_origin(o->dev, bio);
 }
 
-static long origin_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
-               long nr_pages, void **kaddr, pfn_t *pfn)
-{
-       DMWARN("device does not support dax.");
-       return -EIO;
-}
-
 /*
  * Set the target "max_io_len" field to the minimum of all the snapshots'
  * chunk sizes.
@@ -2404,7 +2397,6 @@ static struct target_type origin_target = {
        .postsuspend = origin_postsuspend,
        .status  = origin_status,
        .iterate_devices = origin_iterate_devices,
-       .direct_access = origin_dax_direct_access,
 };
 
 static struct target_type snapshot_target = {