dm table: remove merge_bvec sector restriction

Remove max_sector restriction - merge function replaced it.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 94116eaf47099ccad9f8ca458afd3c4f1e835435..798e468103b879f7986842028709be8852aa3dca 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -506,14 +506,13 @@ void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
        rs->max_sectors =
                min_not_zero(rs->max_sectors, q->max_sectors);
 
-       /* FIXME: Device-Mapper on top of RAID-0 breaks because DM
-        *        currently doesn't honor MD's merge_bvec_fn routine.
-        *        In this case, we'll force DM to use PAGE_SIZE or
-        *        smaller I/O, just to be safe. A better fix is in the
-        *        works, but add this for the time being so it will at
-        *        least operate correctly.
+       /*
+        * Check if merge fn is supported.
+        * If not we'll force DM to use PAGE_SIZE or
+        * smaller I/O, just to be safe.
         */
-       if (q->merge_bvec_fn)
+
+       if (q->merge_bvec_fn && !ti->type->merge)
                rs->max_sectors =
                        min_not_zero(rs->max_sectors,
                                     (unsigned int) (PAGE_SIZE >> 9));