block, cfq: restructure io_cq creation path for io_context interface cleanup
Add elevator_ops->elevator_init_icq_fn() and restructure
cfq_create_cic() and rename it to ioc_create_icq().
The new function expects its caller to pass in io_context, uses
elevator_type->icq_cache, handles generic init, calls the new elevator
operation for elevator specific initialization, and returns pointer to
created or looked up icq. This leaves cfq_icq_pool variable without
any user. Removed.
This prepares for io_context interface cleanup and doesn't introduce
any functional difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 06e4dd56..c8f1e67 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -26,6 +26,7 @@
typedef void (elevator_completed_req_fn) (struct request_queue *, struct request *);
typedef int (elevator_may_queue_fn) (struct request_queue *, int);
+typedef void (elevator_init_icq_fn) (struct io_cq *);
typedef void (elevator_exit_icq_fn) (struct io_cq *);
typedef int (elevator_set_req_fn) (struct request_queue *, struct request *, gfp_t);
typedef void (elevator_put_req_fn) (struct request *);
@@ -59,6 +60,7 @@
elevator_request_list_fn *elevator_former_req_fn;
elevator_request_list_fn *elevator_latter_req_fn;
+ elevator_init_icq_fn *elevator_init_icq_fn;
elevator_exit_icq_fn *elevator_exit_icq_fn;
elevator_set_req_fn *elevator_set_req_fn;