From patchwork Fri May 1 13:23:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 226563 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 03550C47253 for ; Fri, 1 May 2020 13:50:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D57412051A for ; Fri, 1 May 2020 13:50:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588341056; bh=p262YZn7SlOJ9SdgjgOh7lUmTweP6tiBeMxeDpl8gu0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QDxZWZLllhHNtNcTYciij13rEsytAGkJ+nwGZDnhQwE/mxKQZlwsZ4nrbuKOBClgM m1MZjL9JR1JMGKzUqErN/GC4U2rhCNaT/mYednuu+GvYlA3GYw2KLXL5OVdWTegric KVx0ADfMhhl29F/8Dn4eqOKx4pfx2U9Bv8dyZr28= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729000AbgEANuv (ORCPT ); Fri, 1 May 2020 09:50:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:39112 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731179AbgEANjY (ORCPT ); Fri, 1 May 2020 09:39:24 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 60158205C9; Fri, 1 May 2020 13:39:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588340363; bh=p262YZn7SlOJ9SdgjgOh7lUmTweP6tiBeMxeDpl8gu0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xsj576hEoQes6wKvS/cvdA9nuWhb5tyj684d8SuYn7oyd9f0qFCvaYcnIxr6l55jm 7MxcCkzEdqxMRp05howhJEL8JJSBmBtrO25Y2BIm4ZXq4R5VNH2wZyXmyaW4bqaxmG 96HzMJJskgPvxCJbOXEwl81s5XBtDo2Ipe2+FddI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Furtado , Brian Foster , Chandan Rajendra , Christoph Hellwig , Allison Collins , "Darrick J. Wong" Subject: [PATCH 5.4 25/83] xfs: acquire superblock freeze protection on eofblocks scans Date: Fri, 1 May 2020 15:23:04 +0200 Message-Id: <20200501131530.318495482@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200501131524.004332640@linuxfoundation.org> References: <20200501131524.004332640@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Brian Foster commit 4b674b9ac852937af1f8c62f730c325fb6eadcdb upstream. The filesystem freeze sequence in XFS waits on any background eofblocks or cowblocks scans to complete before the filesystem is quiesced. At this point, the freezer has already stopped the transaction subsystem, however, which means a truncate or cowblock cancellation in progress is likely blocked in transaction allocation. This results in a deadlock between freeze and the associated scanner. Fix this problem by holding superblock write protection across calls into the block reapers. Since protection for background scans is acquired from the workqueue task context, trylock to avoid a similar deadlock between freeze and blocking on the write lock. Fixes: d6b636ebb1c9f ("xfs: halt auto-reclamation activities while rebuilding rmap") Reported-by: Paul Furtado Signed-off-by: Brian Foster Reviewed-by: Chandan Rajendra Reviewed-by: Christoph Hellwig Reviewed-by: Allison Collins Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Signed-off-by: Greg Kroah-Hartman --- fs/xfs/xfs_icache.c | 10 ++++++++++ fs/xfs/xfs_ioctl.c | 5 ++++- 2 files changed, 14 insertions(+), 1 deletion(-) --- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -907,7 +907,12 @@ xfs_eofblocks_worker( { struct xfs_mount *mp = container_of(to_delayed_work(work), struct xfs_mount, m_eofblocks_work); + + if (!sb_start_write_trylock(mp->m_super)) + return; xfs_icache_free_eofblocks(mp, NULL); + sb_end_write(mp->m_super); + xfs_queue_eofblocks(mp); } @@ -934,7 +939,12 @@ xfs_cowblocks_worker( { struct xfs_mount *mp = container_of(to_delayed_work(work), struct xfs_mount, m_cowblocks_work); + + if (!sb_start_write_trylock(mp->m_super)) + return; xfs_icache_free_cowblocks(mp, NULL); + sb_end_write(mp->m_super); + xfs_queue_cowblocks(mp); } --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -2401,7 +2401,10 @@ xfs_file_ioctl( if (error) return error; - return xfs_icache_free_eofblocks(mp, &keofb); + sb_start_write(mp->m_super); + error = xfs_icache_free_eofblocks(mp, &keofb); + sb_end_write(mp->m_super); + return error; } default: