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Fri, 21 May 2021 23:37:58 +0000 From: Junxiao Bi To: ocfs2-devel@oss.oracle.com Cc: jack@suse.cz, joseph.qi@linux.alibaba.com, linux-fsdevel@vger.kernel.org, junxiao.bi@oracle.com Subject: [PATCH v2] ocfs2: fix data corruption by fallocate Date: Fri, 21 May 2021 16:36:12 -0700 Message-Id: <20210521233612.75185-1-junxiao.bi@oracle.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [73.231.9.254] X-ClientProxiedBy: SJ0PR03CA0356.namprd03.prod.outlook.com (2603:10b6:a03:39c::31) To SJ0PR10MB4752.namprd10.prod.outlook.com (2603:10b6:a03:2d7::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from dhcp-10-159-150-81.vpn.oracle.com (73.231.9.254) by SJ0PR03CA0356.namprd03.prod.outlook.com (2603:10b6:a03:39c::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4150.26 via Frontend Transport; Fri, 21 May 2021 23:37:58 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3b65fc93-e05e-4115-6851-08d91cb17739 X-MS-TrafficTypeDiagnostic: SJ0PR10MB4414: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1284; 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That will cause file corruption. Fix this by zero out eof blocks when extending the inode size. Running the following command with qemu-image 4.2.1 can get a corrupted coverted image file easily. qemu-img convert -p -t none -T none -f qcow2 $qcow_image \ -O qcow2 -o compat=1.1 $qcow_image.conv The usage of fallocate in qemu is like this, it first punches holes out of inode size, then extend the inode size. fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0 fallocate(11, 0, 2276196352, 65536) = 0 v1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html Cc: Cc: Jan Kara Signed-off-by: Junxiao Bi --- Changes in v2: - suggested by Jan Kara, using sb_issue_zeroout to zero eof blocks in disk directly. fs/ocfs2/file.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 47 insertions(+), 2 deletions(-) diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index f17c3d33fb18..17469fc7b20e 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -1855,6 +1855,45 @@ int ocfs2_remove_inode_range(struct inode *inode, return ret; } +/* + * zero out partial blocks of one cluster. + * + * start: file offset where zero starts, will be made upper block aligned. + * len: it will be trimmed to the end of current cluster if "start + len" + * is bigger than it. + */ +static int ocfs2_zeroout_partial_cluster(struct inode *inode, + u64 start, u64 len) +{ + int ret; + u64 start_block, end_block, nr_blocks; + u64 p_block, offset; + u32 cluster, p_cluster, nr_clusters; + struct super_block *sb = inode->i_sb; + u64 end = ocfs2_align_bytes_to_clusters(sb, start); + + if (start + len < end) + end = start + len; + + start_block = ocfs2_blocks_for_bytes(sb, start); + end_block = ocfs2_blocks_for_bytes(sb, end); + nr_blocks = end_block - start_block; + if (!nr_blocks) + return 0; + + cluster = ocfs2_bytes_to_clusters(sb, start); + ret = ocfs2_get_clusters(inode, cluster, &p_cluster, + &nr_clusters, NULL); + if (ret) + return ret; + if (!p_cluster) + return 0; + + offset = start_block - ocfs2_clusters_to_blocks(sb, cluster); + p_block = ocfs2_clusters_to_blocks(sb, p_cluster) + offset; + return sb_issue_zeroout(sb, p_block, nr_blocks, GFP_NOFS); +} + /* * Parts of this function taken from xfs_change_file_space() */ @@ -1865,7 +1904,7 @@ static int __ocfs2_change_file_space(struct file *file, struct inode *inode, { int ret; s64 llen; - loff_t size; + loff_t size, orig_isize; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct buffer_head *di_bh = NULL; handle_t *handle; @@ -1896,6 +1935,7 @@ static int __ocfs2_change_file_space(struct file *file, struct inode *inode, goto out_inode_unlock; } + orig_isize = i_size_read(inode); switch (sr->l_whence) { case 0: /*SEEK_SET*/ break; @@ -1903,7 +1943,7 @@ static int __ocfs2_change_file_space(struct file *file, struct inode *inode, sr->l_start += f_pos; break; case 2: /*SEEK_END*/ - sr->l_start += i_size_read(inode); + sr->l_start += orig_isize; break; default: ret = -EINVAL; @@ -1957,6 +1997,11 @@ static int __ocfs2_change_file_space(struct file *file, struct inode *inode, default: ret = -EINVAL; } + + /* zeroout eof blocks in the cluster. */ + if (!ret && change_size && orig_isize < size) + ret = ocfs2_zeroout_partial_cluster(inode, orig_isize, + size - orig_isize); up_write(&OCFS2_I(inode)->ip_alloc_sem); if (ret) { mlog_errno(ret); -- 2.24.3 (Apple Git-128)