From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 716D2C4346B for ; Mon, 21 Sep 2020 08:08:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 18E5020874 for ; Mon, 21 Sep 2020 08:08:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Sk2hPYgw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 18E5020874 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 645ED900042; Mon, 21 Sep 2020 04:08:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5CEC3900040; Mon, 21 Sep 2020 04:08:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 44A1D900042; Mon, 21 Sep 2020 04:08:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0002.hostedemail.com [216.40.44.2]) by kanga.kvack.org (Postfix) with ESMTP id 1E017900040 for ; Mon, 21 Sep 2020 04:08:04 -0400 (EDT) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id D545E8249980 for ; Mon, 21 Sep 2020 08:08:03 +0000 (UTC) X-FDA: 77286340446.21.plane99_5b0e19427143 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin21.hostedemail.com (Postfix) with ESMTP id B3477180442C4 for ; Mon, 21 Sep 2020 08:08:03 +0000 (UTC) X-HE-Tag: plane99_5b0e19427143 X-Filterd-Recvd-Size: 5346 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf50.hostedemail.com (Postfix) with ESMTP for ; Mon, 21 Sep 2020 08:08:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=II635vFBb1VUrIhyKQTtXi4VWoh2O6zcRcSXRwzfbpE=; b=Sk2hPYgwgcgokdAsqo1nu9HhXB OsjHKn5+BJvFWY4Sefcpyh5ujRWi0Z4oD5MmZWRj9xnAWRVDX+T5B4Oa2aZeBLOxRQQi5QrofHqYp y4CtQBUtWJFkbK6afdiIHfkP4HgvN6TJqbTyUG4eI0cppvd44LZfg29PkHvEAcGtKxOq9XyLihzxt bMincOmR8eLZ0JmE8/+bXBo2ogEsw3QcS2HVEtTwmAvK3QSdmYXS5EmE1XbL1I99HXL5lS6vkBKqy ZXc7+N80HDK/k2lUP9oVOk1HmVfHjn1Zh/A0GSN/Jjl/hR2fMjBdV3ele27qaYfTBCjhuRzynt+4B UvT6a2cw==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKGrP-0006Xc-DD; Mon, 21 Sep 2020 08:07:43 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Song Liu , Hans de Goede , Coly Li , Richard Weinberger , Minchan Kim , Johannes Thumshirn , Justin Sanders , linux-mtd@lists.infradead.org, dm-devel@redhat.com, linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org, drbd-dev@lists.linbit.com, linux-raid@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, Jan Kara , Johannes Thumshirn Subject: [PATCH 08/13] bdi: remove BDI_CAP_CGROUP_WRITEBACK Date: Mon, 21 Sep 2020 10:07:29 +0200 Message-Id: <20200921080734.452759-9-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921080734.452759-1-hch@lst.de> References: <20200921080734.452759-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Just checking SB_I_CGROUPWB for cgroup writeback support is enough. Either the file system allocates its own bdi (e.g. btrfs), in which case it is known to support cgroup writeback, or the bdi comes from the block layer, which always supports cgroup writeback. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Johannes Thumshirn --- block/blk-core.c | 1 - fs/btrfs/disk-io.c | 1 - include/linux/backing-dev.h | 8 +++----- 3 files changed, 3 insertions(+), 7 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 865d39e5be2b28..1cc4fa6bc7fe1f 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -538,7 +538,6 @@ struct request_queue *blk_alloc_queue(int node_id) if (!q->stats) goto fail_stats; =20 - q->backing_dev_info->capabilities =3D BDI_CAP_CGROUP_WRITEBACK; q->node =3D node_id; =20 atomic_set(&q->nr_active_requests_shared_sbitmap, 0); diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 047934cea25efa..e24927bddd5829 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3091,7 +3091,6 @@ int __cold open_ctree(struct super_block *sb, struc= t btrfs_fs_devices *fs_device goto fail_sb_buffer; } =20 - sb->s_bdi->capabilities |=3D BDI_CAP_CGROUP_WRITEBACK; sb->s_bdi->ra_pages *=3D btrfs_super_num_devices(disk_super); sb->s_bdi->ra_pages =3D max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE); =20 diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 0b06b2d26c9aa3..52583b6f2ea05d 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -123,7 +123,6 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, u= nsigned int max_ratio); * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshol= d. * - * BDI_CAP_CGROUP_WRITEBACK: Supports cgroup-aware writeback. * BDI_CAP_SYNCHRONOUS_IO: Device is so fast that asynchronous IO would = be * inefficient. */ @@ -233,9 +232,9 @@ int inode_congested(struct inode *inode, int cong_bit= s); * inode_cgwb_enabled - test whether cgroup writeback is enabled on an i= node * @inode: inode of interest * - * cgroup writeback requires support from both the bdi and filesystem. - * Also, both memcg and iocg have to be on the default hierarchy. Test - * whether all conditions are met. + * Cgroup writeback requires support from the filesystem. Also, both me= mcg and + * iocg have to be on the default hierarchy. Test whether all condition= s are + * met. * * Note that the test result may change dynamically on the same inode * depending on how memcg and iocg are configured. @@ -247,7 +246,6 @@ static inline bool inode_cgwb_enabled(struct inode *i= node) return cgroup_subsys_on_dfl(memory_cgrp_subsys) && cgroup_subsys_on_dfl(io_cgrp_subsys) && bdi_cap_account_dirty(bdi) && - (bdi->capabilities & BDI_CAP_CGROUP_WRITEBACK) && (inode->i_sb->s_iflags & SB_I_CGROUPWB); } =20 --=20 2.28.0