drbd: Removed checks for REQ_HARDBARRIER on incomming BIOs

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

3 files changed, 0 insertions, 20 deletions

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 575bfba1b0da..0c527d281622 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -832,7 +832,6 @@ enum {
                                  * Gets cleared when the state.conn
                                  * goes into C_CONNECTED state. */
         WRITE_BM_AFTER_RESYNC,  /* A kmalloc() during resync failed */
-        NO_BARRIER_SUPP,        /* underlying block device doesn't implement barriers */
         CONSIDER_RESYNC,
 
         MD_NO_FUA,              /* Users wants us to not use FUA/FLUSH on meta data dev */
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 8e0d707df23d..d7072bf0630d 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2788,11 +2788,6 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
 
         drbd_set_defaults(mdev);
 
-        /* for now, we do NOT yet support it,
-         * even though we start some framework
-         * to eventually support barriers */
-        set_bit(NO_BARRIER_SUPP, &mdev->flags);
-
         atomic_set(&mdev->ap_bio_cnt, 0);
         atomic_set(&mdev->ap_pending_cnt, 0);
         atomic_set(&mdev->rs_pending_cnt, 0);
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 5c2254853559..11a75d32a2e2 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -1032,20 +1032,6 @@ int drbd_make_request_26(struct request_queue *q, struct bio *bio)
                 return 0;
         }
 
-        /* Reject barrier requests if we know the underlying device does
-         * not support them.
-         * XXX: Need to get this info from peer as well some how so we
-         * XXX: reject if EITHER side/data/metadata area does not support them.
-         *
-         * because of those XXX, this is not yet enabled,
-         * i.e. in drbd_init_set_defaults we set the NO_BARRIER_SUPP bit.
-         */
-        if (unlikely(bio->bi_rw & REQ_HARDBARRIER) && test_bit(NO_BARRIER_SUPP, &mdev->flags)) {
-                /* dev_warn(DEV, "Rejecting barrier request as underlying device does not support\n"); */
-                bio_endio(bio, -EOPNOTSUPP);
-                return 0;
-        }
-
         /*
          * what we "blindly" assume:
          */