blk-mq: update ->init_request and ->exit_request prototypes

Remove the request_idx parameter, which can't be used safely now that we
support I/O schedulers with blk-mq.  Except for a superflous check in
mtip32xx it was unused anyway.

Also pass the tag_set instead of just the driver data - this allows drivers
to avoid some code duplication in a follow on cleanup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 304f1c87..feb4971 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -230,18 +230,19 @@
 	return 0;
 }
 
-static int nvme_loop_init_request(void *data, struct request *req,
-				unsigned int hctx_idx, unsigned int rq_idx,
-				unsigned int numa_node)
+static int nvme_loop_init_request(struct blk_mq_tag_set *set,
+		struct request *req, unsigned int hctx_idx,
+		unsigned int numa_node)
 {
-	return nvme_loop_init_iod(data, blk_mq_rq_to_pdu(req), hctx_idx + 1);
+	return nvme_loop_init_iod(set->driver_data, blk_mq_rq_to_pdu(req),
+			hctx_idx + 1);
 }
 
-static int nvme_loop_init_admin_request(void *data, struct request *req,
-				unsigned int hctx_idx, unsigned int rq_idx,
-				unsigned int numa_node)
+static int nvme_loop_init_admin_request(struct blk_mq_tag_set *set,
+		struct request *req, unsigned int hctx_idx,
+		unsigned int numa_node)
 {
-	return nvme_loop_init_iod(data, blk_mq_rq_to_pdu(req), 0);
+	return nvme_loop_init_iod(set->driver_data, blk_mq_rq_to_pdu(req), 0);
 }
 
 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,