block: remove the discard_zeroes_data flag

Now that we use the proper REQ_OP_WRITE_ZEROES operation everywhere we can
kill this hack.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index f8564d63982f..468f1380de1d 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -2813,7 +2813,9 @@ static void configure_discard_support(struct raid_set *rs)
         /* Assume discards not supported until after checks below. */
         ti->discards_supported = false;
 
-        /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */
+        /*
+         * XXX: RAID level 4,5,6 require zeroing for safety.
+         */
         raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6);
 
         for (i = 0; i < rs->raid_disks; i++) {
@@ -2827,8 +2829,6 @@ static void configure_discard_support(struct raid_set *rs)
                         return;
 
                 if (raid456) {
-                        if (!q->limits.discard_zeroes_data)
-                                return;
                         if (!devices_handle_discard_safely) {
                                 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
                                 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");