block: convert blkdev_issue_flush() to use empty barriers

Then we can get rid of ->issue_flush_fn() and all the driver private
implementations of that.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 0 insertions, 20 deletions

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 550148770bb2..56a11f6c127b 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -92,25 +92,6 @@ static void linear_unplug(struct request_queue *q)
         }
 }
 
-static int linear_issue_flush(struct request_queue *q, struct gendisk *disk,
-                              sector_t *error_sector)
-{
-        mddev_t *mddev = q->queuedata;
-        linear_conf_t *conf = mddev_to_conf(mddev);
-        int i, ret = 0;
-
-        for (i=0; i < mddev->raid_disks && ret == 0; i++) {
-                struct block_device *bdev = conf->disks[i].rdev->bdev;
-                struct request_queue *r_queue = bdev_get_queue(bdev);
-
-                if (!r_queue->issue_flush_fn)
-                        ret = -EOPNOTSUPP;
-                else
-                        ret = r_queue->issue_flush_fn(r_queue, bdev->bd_disk, error_sector);
-        }
-        return ret;
-}
-
 static int linear_congested(void *data, int bits)
 {
         mddev_t *mddev = data;
@@ -279,7 +260,6 @@ static int linear_run (mddev_t *mddev)
 
         blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec);
         mddev->queue->unplug_fn = linear_unplug;
-        mddev->queue->issue_flush_fn = linear_issue_flush;
         mddev->queue->backing_dev_info.congested_fn = linear_congested;
         mddev->queue->backing_dev_info.congested_data = mddev;
         return 0;