block: kill rq->data

Now that all block request data transfer is done via bio, rq->data
isn't used.  Kill it.

While at it, make the roles of rq->special and buffer clear.

[ Impact: drop now unncessary field from struct request ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Boaz Harrosh <bharrosh@panasas.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 82a0ca2f6729..bb9aa43551b2 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -500,7 +500,6 @@ static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 
         rq = blk_get_request(q, WRITE, __GFP_WAIT);
         rq->cmd_type = REQ_TYPE_BLOCK_PC;
-        rq->data = NULL;
         rq->data_len = 0;
         rq->extra_len = 0;
         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;