From patchwork Mon Apr 6 19:58:25 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tejun Heo X-Patchwork-Id: 6164241 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 48A089F2EC for ; Mon, 6 Apr 2015 20:00:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 52C0B20357 for ; Mon, 6 Apr 2015 20:00:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5687E20166 for ; Mon, 6 Apr 2015 20:00:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753471AbbDFT75 (ORCPT ); Mon, 6 Apr 2015 15:59:57 -0400 Received: from mail-qk0-f170.google.com ([209.85.220.170]:34070 "EHLO mail-qk0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753442AbbDFT7x (ORCPT ); Mon, 6 Apr 2015 15:59:53 -0400 Received: by qkgx75 with SMTP id x75so31085742qkg.1; Mon, 06 Apr 2015 12:59:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=BQ051nbeUKChAjNG5sxvV1f7Xs+qPMkwMtbRAhYdRdU=; b=fKbyC5d+VTx9bWJLDVJCadhh2amDu8QGSZG8/vUvny0Z9KlFDvHQH6SB3UyN4OsFra Y7SqQlsPhOFkFXP9pVCXeGvoa1xAbB1h7vaha2pV1HBF08LPM3gPUrefpos/DF+6nzIN O5CK42Ff7Jzd14+3s7GsvwtHmbVJRHq5n0p8y26VRUWEz9/hbTbyZxrq28vdSPqzMA6S lsaroDXgdi/T7YdNJR7+4q/VVVD9c6yqNS1878tG25YKHwEpoaYZg88KJMk2iPM75Nnw cBlWcR9zwe3gqAV8lWBYTnDJmK4NbRVivBTJYeP8alkenfN7Cg5eRWBrSmj9UPZPVFqV OMhA== X-Received: by 10.55.24.11 with SMTP id j11mr30503141qkh.73.1428350392681; Mon, 06 Apr 2015 12:59:52 -0700 (PDT) Received: from htj.duckdns.org.lan (207-38-238-8.c3-0.wsd-ubr1.qens-wsd.ny.cable.rcn.com. [207.38.238.8]) by mx.google.com with ESMTPSA id z67sm3914418qgz.10.2015.04.06.12.59.51 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 06 Apr 2015 12:59:52 -0700 (PDT) From: Tejun Heo To: axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, jack@suse.cz, hch@infradead.org, hannes@cmpxchg.org, linux-fsdevel@vger.kernel.org, vgoyal@redhat.com, lizefan@huawei.com, cgroups@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.cz, clm@fb.com, fengguang.wu@intel.com, david@fromorbit.com, gthelen@google.com, Tejun Heo Subject: [PATCH 36/49] writeback: remove bdi_start_writeback() Date: Mon, 6 Apr 2015 15:58:25 -0400 Message-Id: <1428350318-8215-37-git-send-email-tj@kernel.org> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1428350318-8215-1-git-send-email-tj@kernel.org> References: <1428350318-8215-1-git-send-email-tj@kernel.org> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID,T_RP_MATCHES_RCVD,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP bdi_start_writeback() is a thin wrapper on top of __wb_start_writeback() which is used only by laptop_mode_timer_fn(). This patches removes bdi_start_writeback(), renames __wb_start_writeback() to wb_start_writeback() and makes laptop_mode_timer_fn() use it instead. This doesn't cause any functional difference and will ease making laptop_mode_timer_fn() cgroup writeback aware. Signed-off-by: Tejun Heo Cc: Jens Axboe Cc: Jan Kara --- fs/fs-writeback.c | 68 +++++++++++++++++---------------------------- include/linux/backing-dev.h | 4 +-- mm/page-writeback.c | 4 +-- 3 files changed, 29 insertions(+), 47 deletions(-) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 6720af9..de309fa 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -172,33 +172,6 @@ out_unlock: spin_unlock_bh(&wb->work_lock); } -static void __wb_start_writeback(struct bdi_writeback *wb, long nr_pages, - bool range_cyclic, enum wb_reason reason) -{ - struct wb_writeback_work *work; - - if (!wb_has_dirty_io(wb)) - return; - - /* - * This is WB_SYNC_NONE writeback, so if allocation fails just - * wakeup the thread for old dirty data writeback - */ - work = kzalloc(sizeof(*work), GFP_ATOMIC); - if (!work) { - trace_writeback_nowork(wb->bdi); - wb_wakeup(wb); - return; - } - - work->sync_mode = WB_SYNC_NONE; - work->nr_pages = nr_pages; - work->range_cyclic = range_cyclic; - work->reason = reason; - - wb_queue_work(wb, work); -} - #ifdef CONFIG_CGROUP_WRITEBACK /** @@ -228,22 +201,31 @@ EXPORT_SYMBOL_GPL(inode_congested); #endif /* CONFIG_CGROUP_WRITEBACK */ -/** - * bdi_start_writeback - start writeback - * @bdi: the backing device to write from - * @nr_pages: the number of pages to write - * @reason: reason why some writeback work was initiated - * - * Description: - * This does WB_SYNC_NONE opportunistic writeback. The IO is only - * started when this function returns, we make no guarantees on - * completion. Caller need not hold sb s_umount semaphore. - * - */ -void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages, - enum wb_reason reason) +void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, + bool range_cyclic, enum wb_reason reason) { - __wb_start_writeback(&bdi->wb, nr_pages, true, reason); + struct wb_writeback_work *work; + + if (!wb_has_dirty_io(wb)) + return; + + /* + * This is WB_SYNC_NONE writeback, so if allocation fails just + * wakeup the thread for old dirty data writeback + */ + work = kzalloc(sizeof(*work), GFP_ATOMIC); + if (!work) { + trace_writeback_nowork(wb->bdi); + wb_wakeup(wb); + return; + } + + work->sync_mode = WB_SYNC_NONE; + work->nr_pages = nr_pages; + work->range_cyclic = range_cyclic; + work->reason = reason; + + wb_queue_work(wb, work); } /** @@ -1201,7 +1183,7 @@ void wakeup_flusher_threads(long nr_pages, enum wb_reason reason) rcu_read_lock(); list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) - __wb_start_writeback(&bdi->wb, nr_pages, false, reason); + wb_start_writeback(&bdi->wb, nr_pages, false, reason); rcu_read_unlock(); } diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index c797980..0ff40c2 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -25,8 +25,8 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent, int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev); void bdi_unregister(struct backing_dev_info *bdi); int __must_check bdi_setup_and_register(struct backing_dev_info *, char *); -void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages, - enum wb_reason reason); +void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, + bool range_cyclic, enum wb_reason reason); void bdi_start_background_writeback(struct backing_dev_info *bdi); void wb_workfn(struct work_struct *work); void wb_wakeup_delayed(struct bdi_writeback *wb); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 8755f80..3b6d79a 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1729,8 +1729,8 @@ void laptop_mode_timer_fn(unsigned long data) * threshold */ if (bdi_has_dirty_io(&q->backing_dev_info)) - bdi_start_writeback(&q->backing_dev_info, nr_pages, - WB_REASON_LAPTOP_TIMER); + wb_start_writeback(&q->backing_dev_info.wb, nr_pages, true, + WB_REASON_LAPTOP_TIMER); } /*