From patchwork Mon Mar 6 16:33:58 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 9607125 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 A04F9604DD for ; Mon, 6 Mar 2017 16:35:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9BEFF26E51 for ; Mon, 6 Mar 2017 16:35:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9110F27B2F; Mon, 6 Mar 2017 16:35:00 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI 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 1B312279B3 for ; Mon, 6 Mar 2017 16:34:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754412AbdCFQe4 (ORCPT ); Mon, 6 Mar 2017 11:34:56 -0500 Received: from mx2.suse.de ([195.135.220.15]:45712 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754414AbdCFQew (ORCPT ); Mon, 6 Mar 2017 11:34:52 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id B4B40ADA7; Mon, 6 Mar 2017 16:34:36 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id AEF041E3957; Mon, 6 Mar 2017 17:34:34 +0100 (CET) From: Jan Kara To: Jens Axboe Cc: linux-block@vger.kernel.org, Christoph Hellwig , Dan Williams , Thiago Jung Bauermann , Lekshmi Pillai , Tejun Heo , NeilBrown , Omar Sandoval , Jan Kara Subject: [PATCH 05/11] bdi: Move removal from bdi->wb_list into wb_shutdown() Date: Mon, 6 Mar 2017 17:33:58 +0100 Message-Id: <20170306163404.1238-6-jack@suse.cz> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20170306163404.1238-1-jack@suse.cz> References: <20170306163404.1238-1-jack@suse.cz> 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 Currently the removal from bdi->wb_list happens directly in cgwb_release_workfn(). Move it to wb_shutdown() which is functionally equivalent and more logical (the list gets only used for distributing writeback works among bdi_writeback structures). It will also allow us to simplify writeback shutdown in cgwb_bdi_destroy(). Acked-by: Tejun Heo Signed-off-by: Jan Kara --- mm/backing-dev.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 37cd1adae979..4dffae6e2d7b 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -345,6 +345,8 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi, return err; } +static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb); + /* * Remove bdi from the global list and shutdown any threads we have running */ @@ -358,6 +360,7 @@ static void wb_shutdown(struct bdi_writeback *wb) } spin_unlock_bh(&wb->work_lock); + cgwb_remove_from_bdi_list(wb); /* * Drain work list and shutdown the delayed_work. !WB_registered * tells wb_workfn() that @wb is dying and its work_list needs to @@ -491,10 +494,6 @@ static void cgwb_release_workfn(struct work_struct *work) release_work); struct backing_dev_info *bdi = wb->bdi; - spin_lock_irq(&cgwb_lock); - list_del_rcu(&wb->bdi_node); - spin_unlock_irq(&cgwb_lock); - wb_shutdown(wb); css_put(wb->memcg_css); @@ -526,6 +525,13 @@ static void cgwb_kill(struct bdi_writeback *wb) percpu_ref_kill(&wb->refcnt); } +static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb) +{ + spin_lock_irq(&cgwb_lock); + list_del_rcu(&wb->bdi_node); + spin_unlock_irq(&cgwb_lock); +} + static int cgwb_create(struct backing_dev_info *bdi, struct cgroup_subsys_state *memcg_css, gfp_t gfp) { @@ -783,6 +789,8 @@ static void cgwb_bdi_destroy(struct backing_dev_info *bdi) wb_congested_put(bdi->wb_congested); } +static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb) { } + #endif /* CONFIG_CGROUP_WRITEBACK */ int bdi_init(struct backing_dev_info *bdi)