From patchwork Thu Aug 20 09:21:35 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: 265752 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, 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 87356C433E1 for ; Thu, 20 Aug 2020 10:04:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4917F2173E for ; Thu, 20 Aug 2020 10:04:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917861; bh=uD8BoJVFMMTmXhc0uvkBTZwrcwMK5/4DLUXVP/JoR4Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=twEG18hFxxkWUUdb/argCU7wRS4ZCn78QUMd7ojmMT78gBkTd7tMaHEALIlolvxCx fXN0U0QwHCWNrbqDFVhL/tpnMls9qZY9OvBk4OzyzkUxtYARzDPoc3fSvvlht7whC2 IJ569Ts5KcCbHM0GdTnRRwsO/k80TNoSDAxnlYJo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728857AbgHTKER (ORCPT ); Thu, 20 Aug 2020 06:04:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:50258 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730369AbgHTKBc (ORCPT ); Thu, 20 Aug 2020 06:01:32 -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 291372075E; Thu, 20 Aug 2020 10:01:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917691; bh=uD8BoJVFMMTmXhc0uvkBTZwrcwMK5/4DLUXVP/JoR4Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kWX7YMitLFFvfdEQYgZYIF2Zr/zGmyC+05QdYwdgPqDFPNfRwMFNhja3Jtd1V///0 Eg1TShwW7v+IZjLfNenCXbiv6C0oNLVxutjDPiOOOCQ5AlRtKKbvPb9DqiJYRitf/0 X3Lb9sov7YZJkgObGT7XJkfYoQ+PwkB2kNrqAgDM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Darrick J. Wong" , Brian Foster , Sasha Levin Subject: [PATCH 4.9 122/212] xfs: fix reflink quota reservation accounting error Date: Thu, 20 Aug 2020 11:21:35 +0200 Message-Id: <20200820091608.517390750@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@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: Darrick J. Wong [ Upstream commit 83895227aba1ade33e81f586aa7b6b1e143096a5 ] Quota reservations are supposed to account for the blocks that might be allocated due to a bmap btree split. Reflink doesn't do this, so fix this to make the quota accounting more accurate before we start rearranging things. Fixes: 862bb360ef56 ("xfs: reflink extents from one file to another") Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster Signed-off-by: Sasha Levin --- fs/xfs/xfs_reflink.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 6b753b969f7b8..aa99711a8ff96 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1108,6 +1108,7 @@ xfs_reflink_remap_extent( xfs_filblks_t rlen; xfs_filblks_t unmap_len; xfs_off_t newlen; + int64_t qres; int error; unmap_len = irec->br_startoff + irec->br_blockcount - destoff; @@ -1135,13 +1136,19 @@ xfs_reflink_remap_extent( xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); - /* If we're not just clearing space, then do we have enough quota? */ - if (real_extent) { - error = xfs_trans_reserve_quota_nblks(tp, ip, - irec->br_blockcount, 0, XFS_QMOPT_RES_REGBLKS); - if (error) - goto out_cancel; - } + /* + * Reserve quota for this operation. We don't know if the first unmap + * in the dest file will cause a bmap btree split, so we always reserve + * at least enough blocks for that split. If the extent being mapped + * in is written, we need to reserve quota for that too. + */ + qres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); + if (real_extent) + qres += irec->br_blockcount; + error = xfs_trans_reserve_quota_nblks(tp, ip, qres, 0, + XFS_QMOPT_RES_REGBLKS); + if (error) + goto out_cancel; trace_xfs_reflink_remap(ip, irec->br_startoff, irec->br_blockcount, irec->br_startblock);