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, 21 deletions

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index ef0da2d84959..e79e1a538d44 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -40,26 +40,6 @@ static void raid0_unplug(struct request_queue *q)
         }
 }
 
-static int raid0_issue_flush(struct request_queue *q, struct gendisk *disk,
-                             sector_t *error_sector)
-{
-        mddev_t *mddev = q->queuedata;
-        raid0_conf_t *conf = mddev_to_conf(mddev);
-        mdk_rdev_t **devlist = conf->strip_zone[0].dev;
-        int i, ret = 0;
-
-        for (i=0; i<mddev->raid_disks && ret == 0; i++) {
-                struct block_device *bdev = devlist[i]->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 raid0_congested(void *data, int bits)
 {
         mddev_t *mddev = data;
@@ -250,7 +230,6 @@ static int create_strip_zones (mddev_t *mddev)
 
         mddev->queue->unplug_fn = raid0_unplug;
 
-        mddev->queue->issue_flush_fn = raid0_issue_flush;
         mddev->queue->backing_dev_info.congested_fn = raid0_congested;
         mddev->queue->backing_dev_info.congested_data = mddev;