From 783660b2f60418144e168ab75a06786f9695fc70 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 19 Jan 2007 11:27:47 +1100 Subject: [PATCH] elevator: don't sort reads between writes Don't allow elv_dispatch_sort() to mix reads and writes together, it's rarely a good idea. Signed-off-by: Jens Axboe --- block/elevator.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block/elevator.c b/block/elevator.c index d0376239914..25f6ef28e3b 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -413,6 +413,8 @@ void elv_dispatch_sort(request_queue_t *q, struct request *rq) list_for_each_prev(entry, &q->queue_head) { struct request *pos = list_entry_rq(entry); + if (rq_data_dir(rq) != rq_data_dir(pos)) + break; if (pos->cmd_flags & (REQ_SOFTBARRIER|REQ_HARDBARRIER|REQ_STARTED)) break; if (rq->sector >= boundary) { -- 2.41.1