From patchwork Wed Nov 8 08:11:14 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 10047969 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 37E98603FA for ; Wed, 8 Nov 2017 08:11:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 290C929526 for ; Wed, 8 Nov 2017 08:11:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1DFC42A503; Wed, 8 Nov 2017 08:11:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A40D429526 for ; Wed, 8 Nov 2017 08:11:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751010AbdKHIL5 (ORCPT ); Wed, 8 Nov 2017 03:11:57 -0500 Received: from esa5.hgst.iphmx.com ([216.71.153.144]:3322 "EHLO esa5.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751042AbdKHILn (ORCPT ); Wed, 8 Nov 2017 03:11:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1510128704; x=1541664704; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=2zFWNUkL0nTusBDk0zOUGCKxIhHhQFumBRmO0Igs9fM=; b=XZPlTfr7II85FxPMYuXBH/YUlj2baoDISTuGJOM5HpCFHnE2+xT3qjuX BOCc7m7WOO6hmi/dTs1kLNzVsolSH14bs0MFVaDElt8JO4QQh3O2Svrku P3ps0iPs2xgb3LIe6Poe+Om5DqV/cyYuAz5K3/PblOWXlG67WB7ZTjpXj Hd3rBV4RHk3VitEeslDgYZQKP3GPDiecCp2EihEBEEZlcCnWHOO2hbCOt EL4qBcwgOKv+6mmnwOe8OnPDOULntC4i1V1HSroLLnY7nCVSvne7TD0tu heQG27mEAW8Dph6BeOxxlGgOPyCv0V5kRukrHRQtue7LrP0EPs8V6RuCy A==; X-IronPort-AV: E=Sophos;i="5.44,363,1505750400"; d="scan'208";a="61761462" Received: from sjappemgw12.hgst.com (HELO sjappemgw11.hgst.com) ([199.255.44.66]) by ob1.hgst.iphmx.com with ESMTP; 08 Nov 2017 16:11:44 +0800 Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by sjappemgw11.hgst.com with ESMTP; 08 Nov 2017 00:11:42 -0800 From: Damien Le Moal To: linux-scsi@vger.kernel.org, "Martin K . Petersen" , linux-block@vger.kernel.org, Jens Axboe Cc: Christoph Hellwig , Bart Van Assche Subject: [PATCH V7 4/8] block: deadline-iosched: Introduce dispatch helpers Date: Wed, 8 Nov 2017 17:11:14 +0900 Message-Id: <20171108081118.7632-5-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.13.6 In-Reply-To: <20171108081118.7632-1-damien.lemoal@wdc.com> References: <20171108081118.7632-1-damien.lemoal@wdc.com> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Avoid directly referencing the next_rq and fifo_list arrays using the helper functions deadline_next_request() and deadline_fifo_request() to facilitate changes in the dispatch request selection in deadline_dispatch_requests() for zoned block devices. While at it, also remove the unnecessary forward declaration of the function deadline_move_request(). Signed-off-by: Damien Le Moal Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen --- block/deadline-iosched.c | 47 +++++++++++++++++++++++++++++++++++++---------- 1 file changed, 37 insertions(+), 10 deletions(-) diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c index b83f77460d28..81e3f0897457 100644 --- a/block/deadline-iosched.c +++ b/block/deadline-iosched.c @@ -50,8 +50,6 @@ struct deadline_data { int front_merges; }; -static void deadline_move_request(struct deadline_data *, struct request *); - static inline struct rb_root * deadline_rb_root(struct deadline_data *dd, struct request *rq) { @@ -231,6 +229,35 @@ static inline int deadline_check_fifo(struct deadline_data *dd, int ddir) } /* + * For the specified data direction, return the next request to dispatch using + * arrival ordered lists. + */ +static struct request * +deadline_fifo_request(struct deadline_data *dd, int data_dir) +{ + if (WARN_ON_ONCE(data_dir != READ && data_dir != WRITE)) + return NULL; + + if (list_empty(&dd->fifo_list[data_dir])) + return NULL; + + return rq_entry_fifo(dd->fifo_list[data_dir].next); +} + +/* + * For the specified data direction, return the next request to dispatch using + * sector position sorted lists. + */ +static struct request * +deadline_next_request(struct deadline_data *dd, int data_dir) +{ + if (WARN_ON_ONCE(data_dir != READ && data_dir != WRITE)) + return NULL; + + return dd->next_rq[data_dir]; +} + +/* * deadline_dispatch_requests selects the best request according to * read/write expire, fifo_batch, etc */ @@ -239,16 +266,15 @@ static int deadline_dispatch_requests(struct request_queue *q, int force) struct deadline_data *dd = q->elevator->elevator_data; const int reads = !list_empty(&dd->fifo_list[READ]); const int writes = !list_empty(&dd->fifo_list[WRITE]); - struct request *rq; + struct request *rq, *next_rq; int data_dir; /* * batches are currently reads XOR writes */ - if (dd->next_rq[WRITE]) - rq = dd->next_rq[WRITE]; - else - rq = dd->next_rq[READ]; + rq = deadline_next_request(dd, WRITE); + if (!rq) + rq = deadline_next_request(dd, READ); if (rq && dd->batching < dd->fifo_batch) /* we have a next request are still entitled to batch */ @@ -291,19 +317,20 @@ static int deadline_dispatch_requests(struct request_queue *q, int force) /* * we are not running a batch, find best request for selected data_dir */ - if (deadline_check_fifo(dd, data_dir) || !dd->next_rq[data_dir]) { + next_rq = deadline_next_request(dd, data_dir); + if (deadline_check_fifo(dd, data_dir) || !next_rq) { /* * A deadline has expired, the last request was in the other * direction, or we have run out of higher-sectored requests. * Start again from the request with the earliest expiry time. */ - rq = rq_entry_fifo(dd->fifo_list[data_dir].next); + rq = deadline_fifo_request(dd, data_dir); } else { /* * The last req was the same dir and we have a next request in * sort order. No expired requests so continue on from here. */ - rq = dd->next_rq[data_dir]; + rq = next_rq; } dd->batching = 0;