From patchwork Mon Sep 21 08:07:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 1368146 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2001:8b0:10b:1231::1; helo=merlin.infradead.org; envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; secure) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=merlin.20170209 header.b=kmx567zC; dkim=fail reason="signature verification failed" (2048-bit key; secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=Sk2hPYgw; dkim-atps=neutral Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4Bvxtc4g5bz9sTC for ; Mon, 21 Sep 2020 18:09:44 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=yOPlSQoiNRIeHIZ14m68mBjNXpZfQnfrxMJs84xfSrI=; b=kmx567zCqPlh+8aUJb0rcqBfw qebEPW03Jpv63IMGFviqMbGIO4lAFvX604OayTasbhLc7TGux1xoMDZg8Kav6dVw/Q2WdRq7dEFBr luUoUt0B5yKpv09hzZEj5VtEvSp+7wskSVvKf7/hd8jtktAysav5inxtm3PEW6sBndFuM85+AoqpR F0YtS2CuYOTuJUEZI10DkZwa4+NEYxPD+yBNwLLUgAGfTvaG8rCFzr+cu7sPd+/WOzj/eEzrA+JUK in9fjwM3BGnUKDSspkgEW7k/tz1GU0MRyPwCtx0j21Z/Aib3wFDMUxR786Rvr1JbWDp/BZqYh+9f6 ek16UyOFg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKGsl-0004sR-6z; Mon, 21 Sep 2020 08:09:07 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKGrQ-0004EP-WD for linux-mtd@merlin.infradead.org; Mon, 21 Sep 2020 08:07:45 +0000 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 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 X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-raid@vger.kernel.org, Hans de Goede , Justin Sanders , Jan Kara , Minchan Kim , Johannes Thumshirn , linux-bcache@vger.kernel.org, Coly Li , linux-block@vger.kernel.org, Song Liu , dm-devel@redhat.com, linux-mtd@lists.infradead.org, Richard Weinberger , linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, drbd-dev@lists.linbit.com Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org 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; - q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK; q->node = node_id; 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, struct btrfs_fs_devices *fs_device goto fail_sb_buffer; } - sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK; sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super); sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE); 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, unsigned int max_ratio); * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold. * - * 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_bits); * inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode * @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 memcg and + * iocg have to be on the default hierarchy. Test whether all conditions 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 *inode) 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); }