block: remove support for bio remapping from ->make_request

There is very little benefit in allowing to let a ->make_request
instance update the bios device and sector and loop around it in
__generic_make_request when we can archive the same through calling
generic_make_request from the driver and letting the loop in
generic_make_request handle it.

Note that various drivers got the return value from ->make_request and
returned non-zero values for errors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 78b20868bcbc..7b986e77b75e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1388,7 +1388,7 @@ out:
  * The request function that just remaps the bio built up by
  * dm_merge_bvec.
  */
-static int _dm_request(struct request_queue *q, struct bio *bio)
+static void _dm_request(struct request_queue *q, struct bio *bio)
 {
         int rw = bio_data_dir(bio);
         struct mapped_device *md = q->queuedata;
@@ -1409,12 +1409,12 @@ static int _dm_request(struct request_queue *q, struct bio *bio)
                         queue_io(md, bio);
                 else
                         bio_io_error(bio);
-                return 0;
+                return;
         }
 
         __split_and_process_bio(md, bio);
         up_read(&md->io_lock);
-        return 0;
+        return;
 }
 
 static int dm_request_based(struct mapped_device *md)
@@ -1422,14 +1422,14 @@ static int dm_request_based(struct mapped_device *md)
         return blk_queue_stackable(md->queue);
 }
 
-static int dm_request(struct request_queue *q, struct bio *bio)
+static void dm_request(struct request_queue *q, struct bio *bio)
 {
         struct mapped_device *md = q->queuedata;
 
         if (dm_request_based(md))
-                return blk_queue_bio(q, bio);
-
-        return _dm_request(q, bio);
+                blk_queue_bio(q, bio);
+        else
+                _dm_request(q, bio);
 }
 
 void dm_dispatch_request(struct request *rq)