From bc1c116974a5c3f498112a6f175d3e4a8cd5bdbc Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 8 Jun 2006 08:49:06 +0200 Subject: [PATCH] elevator switching race There's a race between shutting down one io scheduler and firing up the next, in which a new io could enter and cause the io scheduler to be invoked with bad or NULL data. To fix this, we need to maintain the queue lock for a bit longer. Unfortunately we cannot do that, since the elevator init requires to be run without the lock held. This isn't easily fixable, without also changing the mempool API. So split the initialization into two parts, and alloc-init operation and an attach operation. Then we can preallocate the io scheduler and related structures, and run the attach inside the lock after we detach the old one. This patch has survived 30 minutes of 1 second io scheduler switching with a very busy io load. Signed-off-by: Jens Axboe Signed-off-by: Linus Torvalds --- include/linux/elevator.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux/elevator.h') diff --git a/include/linux/elevator.h b/include/linux/elevator.h index ad133fcfb23..1713ace808b 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -21,7 +21,7 @@ typedef void (elevator_put_req_fn) (request_queue_t *, struct request *); typedef void (elevator_activate_req_fn) (request_queue_t *, struct request *); typedef void (elevator_deactivate_req_fn) (request_queue_t *, struct request *); -typedef int (elevator_init_fn) (request_queue_t *, elevator_t *); +typedef void *(elevator_init_fn) (request_queue_t *, elevator_t *); typedef void (elevator_exit_fn) (elevator_t *); struct elevator_ops -- cgit v1.2.3