From patchwork Wed Sep 10 12:50:35 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: WeiWei Wang X-Patchwork-Id: 4876971 Return-Path: X-Original-To: patchwork-ocfs2-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 57049C0338 for ; Wed, 10 Sep 2014 12:52:30 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 11D712017A for ; Wed, 10 Sep 2014 12:52:29 +0000 (UTC) Received: from aserp1040.oracle.com (aserp1040.oracle.com [141.146.126.69]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8729B20173 for ; Wed, 10 Sep 2014 12:52:26 +0000 (UTC) Received: from acsinet22.oracle.com (acsinet22.oracle.com [141.146.126.238]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id s8ACqGZj022578 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 10 Sep 2014 12:52:17 GMT Received: from oss.oracle.com (oss-external.oracle.com [137.254.96.51]) by acsinet22.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id s8ACqGUs010217 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 10 Sep 2014 12:52:16 GMT Received: from localhost ([127.0.0.1] helo=oss.oracle.com) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1XRhNg-0002Kh-3u; Wed, 10 Sep 2014 05:52:16 -0700 Received: from ucsinet21.oracle.com ([156.151.31.93]) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1XRhNZ-0002JN-T1 for ocfs2-devel@oss.oracle.com; Wed, 10 Sep 2014 05:52:10 -0700 Received: from userp1020.oracle.com (userp1020.oracle.com [156.151.31.79]) by ucsinet21.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id s8ACq9QQ012158 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 10 Sep 2014 12:52:09 GMT Received: from userp2040.oracle.com (userp2040.oracle.com [156.151.31.90]) by userp1020.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id s8ACq84G010623 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 10 Sep 2014 12:52:09 GMT Received: from pps.filterd (userp2040.oracle.com [127.0.0.1]) by userp2040.oracle.com (8.14.7/8.14.7) with SMTP id s8ACpNt1043639 for ; Wed, 10 Sep 2014 12:52:08 GMT Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [119.145.14.64]) by userp2040.oracle.com with ESMTP id 1papds0fba-1 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=NOT) for ; Wed, 10 Sep 2014 12:52:08 +0000 Received: from 172.24.2.119 (EHLO szxeml413-hub.china.huawei.com) ([172.24.2.119]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CBM48131; Wed, 10 Sep 2014 20:50:45 +0800 (CST) Received: from [127.0.0.1] (10.177.31.189) by szxeml413-hub.china.huawei.com (10.82.67.152) with Microsoft SMTP Server id 14.3.158.1; Wed, 10 Sep 2014 20:50:37 +0800 Message-ID: <5410491B.9090707@huawei.com> Date: Wed, 10 Sep 2014 20:50:35 +0800 From: WeiWei Wang User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 MIME-Version: 1.0 To: X-Originating-IP: [10.177.31.189] X-CFilter-Loop: Reflected X-Proofpoint-Virus-Version: vendor=nai engine=5600 definitions=7556 signatures=670517 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=4 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1402240000 definitions=main-1409100122 Cc: mfasheh@suse.com, ocfs2-devel@oss.oracle.com Subject: [Ocfs2-devel] [PATCH 7/7] ocfs2: do not fallback to buffer I/O write if fill holes X-BeenThere: ocfs2-devel@oss.oracle.com X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ocfs2-devel-bounces@oss.oracle.com Errors-To: ocfs2-devel-bounces@oss.oracle.com X-Source-IP: acsinet22.oracle.com [141.146.126.238] X-Spam-Status: No, score=-6.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In this commit, direct-io to a hole will go direct-io first, then fall through to buffered I/O for completing the rest of the request. Signed-off-by: Weiwei Wang --- fs/ocfs2/file.c | 87 ++++++++++++++++++++++++--------------------------------- 1 file changed, 36 insertions(+), 51 deletions(-) diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index a3b0efb..0e32967 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -1353,44 +1353,6 @@ out: return ret; } -/* - * Will look for holes and unwritten extents in the range starting at - * pos for count bytes (inclusive). - */ -static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos, - size_t count) -{ - int ret = 0; - unsigned int extent_flags; - u32 cpos, clusters, extent_len, phys_cpos; - struct super_block *sb = inode->i_sb; - - cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits; - clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos; - - while (clusters) { - ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len, - &extent_flags); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) { - ret = 1; - break; - } - - if (extent_len > clusters) - extent_len = clusters; - - clusters -= extent_len; - cpos += extent_len; - } -out: - return ret; -} - static int ocfs2_write_remove_suid(struct inode *inode) { int ret; @@ -2191,19 +2153,6 @@ static int ocfs2_prepare_inode_for_write(struct file *file, *direct_io = 0; break; } - - /* - * We don't fill holes during direct io, so - * check for them here. If any are found, the - * caller will have to retake some cluster - * locks and initiate the io as buffered. - */ - ret = ocfs2_check_range_for_holes(inode, saved_pos, count); - if (ret == 1) { - *direct_io = 0; - ret = 0; - } else if (ret < 0) - mlog_errno(ret); break; } @@ -2233,6 +2182,7 @@ static ssize_t ocfs2_file_write_iter(struct kiocb *iocb, u32 old_clusters; struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); + struct address_space *mapping = file->f_mapping; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); int full_coherency = !(osb->s_mount_opt & OCFS2_MOUNT_COHERENCY_BUFFERED); @@ -2347,11 +2297,46 @@ relock: iov_iter_truncate(from, count); if (direct_io) { + loff_t endbyte; + ssize_t written_buffered; written = generic_file_direct_write(iocb, from, *ppos); if (written < 0) { ret = written; goto out_dio; } + /* + * direct-io write to a hole: fall through to buffered I/O + * for completing the rest of the request. + */ + *ppos += written; + count -= written; + written_buffered = generic_perform_write(file, from, *ppos); + /* + * If generic_file_buffered_write() retuned a synchronous error + * then we want to return the number of bytes which were + * direct-written, or the error code if that was zero. Note + * that this differs from normal direct-io semantics, which + * will return -EFOO even if some bytes were written. + */ + if (written_buffered < 0) { + ret = written_buffered; + goto out; + } + + /* + * We need to ensure that the page cache pages are written to + * disk and invalidated to preserve the expected O_DIRECT + * semantics. + */ + endbyte = *ppos + written_buffered - written - 1; + ret = filemap_write_and_wait_range(file->f_mapping, *ppos, + endbyte); + if (ret == 0) { + written = written_buffered; + invalidate_mapping_pages(mapping, + *ppos >> PAGE_CACHE_SHIFT, + endbyte >> PAGE_CACHE_SHIFT); + } } else { current->backing_dev_info = file->f_mapping->backing_dev_info; written = generic_perform_write(file, from, *ppos);