From patchwork Sun Oct 2 13:24:25 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 9359659 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 50A96600C8 for ; Sun, 2 Oct 2016 13:26:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 411F128AB4 for ; Sun, 2 Oct 2016 13:26:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 35A9A28ADD; Sun, 2 Oct 2016 13:26:15 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D573428AB4 for ; Sun, 2 Oct 2016 13:26:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752075AbcJBN0M (ORCPT ); Sun, 2 Oct 2016 09:26:12 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:53124 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751802AbcJBN0K (ORCPT ); Sun, 2 Oct 2016 09:26:10 -0400 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u92DNCV9060670 for ; Sun, 2 Oct 2016 09:26:10 -0400 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0b-001b2d01.pphosted.com with ESMTP id 25t99m4q7q-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Sun, 02 Oct 2016 09:26:09 -0400 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sun, 2 Oct 2016 07:26:06 -0600 Received: from b03cxnp08026.gho.boulder.ibm.com (b03cxnp08026.gho.boulder.ibm.com [9.17.130.18]) by d03dlp03.boulder.ibm.com (Postfix) with ESMTP id 750ED19D801C; Sun, 2 Oct 2016 07:25:33 -0600 (MDT) Received: from b03ledav003.gho.boulder.ibm.com (b03ledav003.gho.boulder.ibm.com [9.17.130.234]) by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u92DQ59X12058880; Sun, 2 Oct 2016 06:26:05 -0700 Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A145D6A03C; Sun, 2 Oct 2016 07:26:05 -0600 (MDT) Received: from localhost.in.ibm.com (unknown [9.79.217.200]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP id 71AA96A03B; Sun, 2 Oct 2016 07:26:03 -0600 (MDT) From: Chandan Rajendra To: clm@fb.com, jbacik@fb.com, dsterba@suse.com Cc: Chandan Rajendra , linux-btrfs@vger.kernel.org Subject: [PATCH V21 16/19] Btrfs: subpage-blocksize: btrfs_clone: Flush dirty blocks of a page that do not map the clone range Date: Sun, 2 Oct 2016 18:54:25 +0530 X-Mailer: git-send-email 2.5.5 In-Reply-To: <1475414668-25954-1-git-send-email-chandan@linux.vnet.ibm.com> References: <1475414668-25954-1-git-send-email-chandan@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16100213-0008-0000-0000-000005B6EC16 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00005841; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000186; SDB=6.00763599; UDB=6.00364349; IPR=6.00539010; BA=6.00004776; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00012850; XFM=3.00000011; UTC=2016-10-02 13:26:07 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16100213-0009-0000-0000-00003BCA4FD7 Message-Id: <1475414668-25954-17-git-send-email-chandan@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-10-02_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609280000 definitions=main-1610020247 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP After cloning the required extents, we truncate all the pages that map the file range being cloned. In subpage-blocksize scenario, we could have dirty blocks before and/or after the clone range in the leading/trailing pages. Truncating these pages would lead to data loss. Hence this commit forces such dirty blocks to be flushed to disk before performing the clone operation. Signed-off-by: Chandan Rajendra --- fs/btrfs/ioctl.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index cf13029..0fdc0a0 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3914,6 +3914,7 @@ static noinline int btrfs_clone_files(struct file *file, struct file *file_src, int ret; u64 len = olen; u64 bs = root->fs_info->sb->s_blocksize; + u64 dest_end; int same_inode = src == inode; /* @@ -3974,6 +3975,21 @@ static noinline int btrfs_clone_files(struct file *file, struct file *file_src, goto out_unlock; } + if ((round_down(destoff, PAGE_SIZE) < inode->i_size) && + !IS_ALIGNED(destoff, PAGE_SIZE)) { + ret = filemap_write_and_wait_range(inode->i_mapping, + round_down(destoff, PAGE_SIZE), + destoff - 1); + } + + dest_end = destoff + len - 1; + if ((dest_end < inode->i_size) && + !IS_ALIGNED(dest_end + 1, PAGE_SIZE)) { + ret = filemap_write_and_wait_range(inode->i_mapping, + dest_end + 1, + round_up(dest_end, PAGE_SIZE)); + } + if (destoff > inode->i_size) { ret = btrfs_cont_expand(inode, inode->i_size, destoff); if (ret)