From patchwork Tue Jun 23 11:31:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Xiaoxu X-Patchwork-Id: 11620399 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 57777912 for ; Tue, 23 Jun 2020 11:30:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F9CB206C3 for ; Tue, 23 Jun 2020 11:30:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732364AbgFWLai (ORCPT ); Tue, 23 Jun 2020 07:30:38 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:6387 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732191AbgFWLah (ORCPT ); Tue, 23 Jun 2020 07:30:37 -0400 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id E53F2C7534E096C5800E; Tue, 23 Jun 2020 19:30:35 +0800 (CST) Received: from localhost.localdomain (10.175.101.6) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.487.0; Tue, 23 Jun 2020 19:30:25 +0800 From: Zhang Xiaoxu To: , , CC: , Subject: [PATCH v2 1/2] cifs/smb3: Fix data inconsistent when punch hole Date: Tue, 23 Jun 2020 07:31:53 -0400 Message-ID: <20200623113154.2629513-2-zhangxiaoxu5@huawei.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200623113154.2629513-1-zhangxiaoxu5@huawei.com> References: <20200623113154.2629513-1-zhangxiaoxu5@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-CFilter-Loop: Reflected Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org When punch hole success, we also can read old data from file: # strace -e trace=pread64,fallocate xfs_io -f -c "pread 20 40" \ -c "fpunch 20 40" -c"pread 20 40" file pread64(3, " version 5.8.0-rc1+"..., 40, 20) = 40 fallocate(3, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 20, 40) = 0 pread64(3, " version 5.8.0-rc1+"..., 40, 20) = 40 CIFS implements the fallocate(FALLOCATE_FL_PUNCH_HOLE) with send SMB ioctl(FSCTL_SET_ZERO_DATA) to server. It just set the range of the remote file to zero, but local page caches not updated, then the local page caches inconsistent with server. Also can be found by xfstests generic/316. So, we need to remove the page caches before send the SMB ioctl(FSCTL_SET_ZERO_DATA) to server. Fixes: 31742c5a33176 ("enable fallocate punch hole ("fallocate -p") for SMB3") Suggested-by: Pavel Shilovsky Signed-off-by: Zhang Xiaoxu Cc: stable@vger.kernel.org # v3.17 --- fs/cifs/smb2ops.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 736d86b8a910..02fe77b2f517 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3253,6 +3253,12 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon, return rc; } + /* + * We implement the punch hole through ioctl, so we need remove the page + * caches first, otherwise the data may be inconsistent with the server. + */ + truncate_pagecache_range(inode, offset, offset + len - 1); + cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len); fsctl_buf.FileOffset = cpu_to_le64(offset);