From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932438AbWGMMoE (ORCPT ); Thu, 13 Jul 2006 08:44:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932330AbWGMMoE (ORCPT ); Thu, 13 Jul 2006 08:44:04 -0400 Received: from ns.virtualhost.dk ([195.184.98.160]:26927 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id S1751497AbWGMMoC (ORCPT ); Thu, 13 Jul 2006 08:44:02 -0400 From: Jens Axboe To: linux-kernel@vger.kernel.org Cc: Jens Axboe Subject: [PATCH] 7/15 elevator: introduce a way to reuse rq for internal FIFO handling Date: Thu, 13 Jul 2006 14:46:30 +0200 Message-Id: <1152794798200-git-send-email-axboe@suse.de> X-Mailer: git-send-email 1.4.1.ged0e0 In-Reply-To: <11527947982769-git-send-email-axboe@suse.de> References: <11527947982769-git-send-email-axboe@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org The io schedulers can use this instead of having to allocate space for it themselves. Signed-off-by: Jens Axboe --- include/linux/elevator.h | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/include/linux/elevator.h b/include/linux/elevator.h index 95b2a04..0e7b1a7 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -166,4 +166,16 @@ enum { #define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors) #define rb_entry_rq(node) rb_entry((node), struct request, rb_node) +/* + * Hack to reuse the donelist list_head as the fifo time holder while + * the request is in the io scheduler. Saves an unsigned long in rq. + */ +#define rq_fifo_time(rq) ((unsigned long) (rq)->donelist.next) +#define rq_set_fifo_time(rq,exp) ((rq)->donelist.next = (void *) (exp)) +#define rq_entry_fifo(ptr) list_entry((ptr), struct request, queuelist) +#define rq_fifo_clear(rq) do { \ + list_del_init(&(rq)->queuelist); \ + INIT_LIST_HEAD(&(rq)->donelist); \ + } while (0) + #endif -- 1.4.1.ged0e0