From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1C8C52D023; Mon, 10 Mar 2025 17:54:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741629273; cv=none; b=R1ZGfRp4dSP79ICGqbd+FLwd7lHS1GJwJBU2Dlyg9BO8emXH/hJdlgKPHAeptsqw+zncoWGLjz6KWqQQOYzkO4hfs8qO4f78MiTxGjepJn+DkJxwKeHupUTNN1WxSJ6ZPGFdXPlZFUgzAxr2TIj+zXzONMcghpuOjnfid3iJMwU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741629273; c=relaxed/simple; bh=RT9n0kiWWfShHM07zA1xtWj7JCkkTU2GcKconoQ6ZW8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eMgLcc99VZQ/6or7VDhAnJwg0KrjafODU/Tv9XDumthVYiL6K8rUdFQpMvUiC2yhdDmp6EblDyrlPgeVBAW/+ChXS6wSjeXOD4q1P622Kcd+VHH9yuBS03IhJvFreXuV6cuIT/U1E9z8XgP99fInTXI/3jgkdsOsjHZHnfGD57U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Y8rXI8RE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Y8rXI8RE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B054C4CEE5; Mon, 10 Mar 2025 17:54:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741629273; bh=RT9n0kiWWfShHM07zA1xtWj7JCkkTU2GcKconoQ6ZW8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y8rXI8REn/wayz3HrCuMF2zxMtzyNrVj7iU9fKj5bGIJRp4bdkxlB/dZcBp653G0d YVQK8c/OGd3VGhVCDZaWAFAOV9L7/3rOG2my+yCRYwkexQy2LC+UQ4LA4NOib8QUZU WuQ5X7xM3skkeqKZ0b4yMVmkeLwqS/CQiLbGKj74= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Emmanuel Florac , "Darrick J. Wong" , Christoph Hellwig , Sasha Levin Subject: [PATCH 5.15 237/620] xfs: dont over-report free space or inodes in statvfs Date: Mon, 10 Mar 2025 18:01:23 +0100 Message-ID: <20250310170554.988006393@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250310170545.553361750@linuxfoundation.org> References: <20250310170545.553361750@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Darrick J. Wong [ Upstream commit 4b8d867ca6e2fc6d152f629fdaf027053b81765a ] Emmanual Florac reports a strange occurrence when project quota limits are enabled, free space is lower than the remaining quota, and someone runs statvfs: # mkfs.xfs -f /dev/sda # mount /dev/sda /mnt -o prjquota # xfs_quota -x -c 'limit -p bhard=2G 55' /mnt # mkdir /mnt/dir # xfs_io -c 'chproj 55' -c 'chattr +P' -c 'stat -vvvv' /mnt/dir # fallocate -l 19g /mnt/a # df /mnt /mnt/dir Filesystem Size Used Avail Use% Mounted on /dev/sda 20G 20G 345M 99% /mnt /dev/sda 2.0G 0 2.0G 0% /mnt I think the bug here is that xfs_fill_statvfs_from_dquot unconditionally assigns to f_bfree without checking that the filesystem has enough free space to fill the remaining project quota. However, this is a longstanding behavior of xfs so it's unclear what to do here. Cc: # v2.6.18 Fixes: 932f2c323196c2 ("[XFS] statvfs component of directory/project quota support, code originally by Glen.") Reported-by: Emmanuel Florac Signed-off-by: "Darrick J. Wong" Reviewed-by: Christoph Hellwig Signed-off-by: Sasha Levin --- fs/xfs/xfs_qm_bhv.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/fs/xfs/xfs_qm_bhv.c b/fs/xfs/xfs_qm_bhv.c index 268a07218c777..26b2c449f3c66 100644 --- a/fs/xfs/xfs_qm_bhv.c +++ b/fs/xfs/xfs_qm_bhv.c @@ -32,21 +32,28 @@ xfs_fill_statvfs_from_dquot( limit = blkres->softlimit ? blkres->softlimit : blkres->hardlimit; - if (limit && statp->f_blocks > limit) { - statp->f_blocks = limit; - statp->f_bfree = statp->f_bavail = - (statp->f_blocks > blkres->reserved) ? - (statp->f_blocks - blkres->reserved) : 0; + if (limit) { + uint64_t remaining = 0; + + if (limit > blkres->reserved) + remaining = limit - blkres->reserved; + + statp->f_blocks = min(statp->f_blocks, limit); + statp->f_bfree = min(statp->f_bfree, remaining); + statp->f_bavail = min(statp->f_bavail, remaining); } limit = dqp->q_ino.softlimit ? dqp->q_ino.softlimit : dqp->q_ino.hardlimit; - if (limit && statp->f_files > limit) { - statp->f_files = limit; - statp->f_ffree = - (statp->f_files > dqp->q_ino.reserved) ? - (statp->f_files - dqp->q_ino.reserved) : 0; + if (limit) { + uint64_t remaining = 0; + + if (limit > dqp->q_ino.reserved) + remaining = limit - dqp->q_ino.reserved; + + statp->f_files = min(statp->f_files, limit); + statp->f_ffree = min(statp->f_ffree, remaining); } } -- 2.39.5