From patchwork Fri Oct 5 00:45:21 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. Wong" X-Patchwork-Id: 10627167 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 179E21731 for ; Fri, 5 Oct 2018 00:45:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 088DB28F4F for ; Fri, 5 Oct 2018 00:45:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F14A228F83; Fri, 5 Oct 2018 00:45:35 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY 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 4D88D28F4F for ; Fri, 5 Oct 2018 00:45:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727624AbeJEHlm (ORCPT ); Fri, 5 Oct 2018 03:41:42 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:52316 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727491AbeJEHll (ORCPT ); Fri, 5 Oct 2018 03:41:41 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w950icGB047249; Fri, 5 Oct 2018 00:45:30 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : from : to : cc : date : message-id : in-reply-to : references : mime-version : content-type : content-transfer-encoding; s=corp-2018-07-02; bh=5U4JyjCHEajqV3UK0uH0HPOVrlUriwzUqenNqfb1hII=; b=UTafA38iLsrKcCnkxVQMZLtbOG1mIkWRv6UwIWYRRTxl4zBNCQguczoi9qHn7b64HNSZ rPRyJwEAQxYYmXapIqZCJ/6xYUgrVwYeoJbsVVD4PF+lYjG3I/UrZ6c3knz7sj9RtbOs vrx571q0JYcL+PKPlu7Kfh37FDA45py2apNrstDOmNweDuo3FsHIzrNo/NJzWIaVvdxR IYWf4qKeVq/XSjKTeFtXl3hUqF2GRehD0YH+OkJfdOc7CXzGzOieACJb0BDaHUXw6xtH 9DYzRNpFkbf5f1kkh+106T7zjKN5DqTA7Ycst8SFMd2zLwzdzGN4dng6UjRHQNOpTrAj 2A== Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by aserp2120.oracle.com with ESMTP id 2mt1bqfkw8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 05 Oct 2018 00:45:30 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id w950jUtN006089 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 5 Oct 2018 00:45:30 GMT Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w950jTpX011715; Fri, 5 Oct 2018 00:45:29 GMT Received: from localhost (/10.159.229.198) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 05 Oct 2018 00:45:29 +0000 Subject: [PATCH 07/15] vfs: skip zero-length dedupe requests From: "Darrick J. Wong" To: david@fromorbit.com, darrick.wong@oracle.com Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, ocfs2-devel@oss.oracle.com, sandeen@redhat.com Date: Thu, 04 Oct 2018 17:45:21 -0700 Message-ID: <153870032167.29072.11158511021942868400.stgit@magnolia> In-Reply-To: <153870027422.29072.7433543674436957232.stgit@magnolia> References: <153870027422.29072.7433543674436957232.stgit@magnolia> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9036 signatures=668706 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=729 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810050006 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Darrick J. Wong Don't bother calling the filesystem for a zero-length dedupe request; we can return zero and exit. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/read_write.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/read_write.c b/fs/read_write.c index 973d3da78c09..99b2f809180c 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1966,6 +1966,11 @@ int vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos, if (!dst_file->f_op->dedupe_file_range) goto out_drop_write; + if (len == 0) { + ret = 0; + goto out_drop_write; + } + ret = dst_file->f_op->dedupe_file_range(src_file, src_pos, dst_file, dst_pos, len); out_drop_write: