dm: eliminate 'split_discard_bios' flag from DM target interface

There is no need to have DM core split discards on behalf of a DM target
now that blk_queue_split() handles splitting discards based on the
queue_limits.  A DM target just needs to set max_discard_sectors,
discard_granularity, etc, in queue_limits.

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

1 files changed, 0 insertions, 6 deletions

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index e528baebad69..0f5b3d7c6cb3 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -315,12 +315,6 @@ struct dm_target {
          * whether or not its underlying devices have support.
          */
         bool discards_supported:1;
-
-        /*
-         * Set if the target required discard bios to be split
-         * on max_io_len boundary.
-         */
-        bool split_discard_bios:1;
 };
 
 /* Each target can link one of these into the table */