From patchwork Fri Oct 5 00:45:54 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: 10627217 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 DE1D31731 for ; Fri, 5 Oct 2018 00:46:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CDD3528F4F for ; Fri, 5 Oct 2018 00:46:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C235828F83; Fri, 5 Oct 2018 00:46:12 +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=-5.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from userp2120.oracle.com (userp2120.oracle.com [156.151.31.85]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 623FE28F4F for ; Fri, 5 Oct 2018 00:46:12 +0000 (UTC) Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w950iUk5000696; Fri, 5 Oct 2018 00:45:59 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : date : message-id : in-reply-to : references : mime-version : cc : subject : list-id : list-unsubscribe : list-archive : list-post : list-help : list-subscribe : content-type : content-transfer-encoding : sender; s=corp-2018-07-02; bh=FEPHIecQ9vdS24ZkTdjw5wt7ljcLf/L7cNB/n2Hi7k8=; b=sWlTgAsqf3ChB1qs8TUfSP3/piwTbpZNpHHe2O7vn9q09HTjBFg8L+WgpqT/VL5bL+ab zS2XgILx7qhERAiJGQk7WIyxa7c5iL7U6h3BOPATF8UPJyWO/H6ZedinVIRNk2ri7iBX sCQcKSjPUezsCC/0qxEgAncXfdimEMpENZK0tTQTth48LQcrCi5RuiuOdUZ34h6sLzp4 WbUCMZDY5wHLn8tN8V/0RvrOP/iE+OBcTdrDtXtispR24IgLO1NNZ5tipsM4Hlo2jxvN QgCtwDvl88ZbxN66Z5bhsz7DpU2/jDols7+wbmXFkz0jslWimQmr8AYF+uLzpF5INeSz dg== Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp2120.oracle.com with ESMTP id 2mt21rfk1g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 05 Oct 2018 00:45:59 +0000 Received: from oss.oracle.com (oss-old-reserved.oracle.com [137.254.22.2]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id w950jwNO007248 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 5 Oct 2018 00:45:58 GMT Received: from localhost ([127.0.0.1] helo=lb-oss.oracle.com) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1g8EFi-0004uU-Dz; Thu, 04 Oct 2018 17:45:58 -0700 Received: from aserv0022.oracle.com ([141.146.126.234]) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1g8EFg-0004u9-M0 for ocfs2-devel@oss.oracle.com; Thu, 04 Oct 2018 17:45:56 -0700 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 w950jusF007131 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 5 Oct 2018 00:45:56 GMT Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w950juM5011898; Fri, 5 Oct 2018 00:45:56 GMT Received: from localhost (/10.159.229.198) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 04 Oct 2018 17:45:56 -0700 From: "Darrick J. Wong" To: david@fromorbit.com, darrick.wong@oracle.com Date: Thu, 04 Oct 2018 17:45:54 -0700 Message-ID: <153870035471.29072.15690301164025555492.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 Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, ocfs2-devel@oss.oracle.com, linux-btrfs@vger.kernel.org, sandeen@redhat.com Subject: [Ocfs2-devel] [PATCH 11/15] vfs: allow short clone and dedupe operations 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-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=884 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810050006 X-Virus-Scanned: ClamAV using ClamSMTP From: Darrick J. Wong Allow the clone and dedupe prep function to shorten the request if the caller can handle it. Signed-off-by: Darrick J. Wong --- fs/read_write.c | 8 ++------ include/linux/fs.h | 2 +- mm/filemap.c | 19 +++++++++++++++---- 3 files changed, 18 insertions(+), 11 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 4eaea52f70a8..292d68c2f47c 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1726,7 +1726,6 @@ int vfs_clone_file_prep(struct file *file_in, loff_t pos_in, { struct inode *inode_in = file_inode(file_in); struct inode *inode_out = file_inode(file_out); - uint64_t nlen; loff_t isize; bool same_inode = (inode_in == inode_out); bool is_dedupe = (flags & CLONERANGE_DEDUPE); @@ -1758,13 +1757,10 @@ int vfs_clone_file_prep(struct file *file_in, loff_t pos_in, } /* Check that we don't violate system file offset limits. */ - nlen = *len; - ret = generic_clone_checks(file_in, pos_in, file_out, pos_out, &nlen, - is_dedupe); + ret = generic_clone_checks(file_in, pos_in, file_out, pos_out, len, + flags); if (ret) return ret; - if (nlen != *len) - return -EINVAL; /* Wait for the completion of any pending IOs on both files */ inode_dio_wait(inode_in); diff --git a/include/linux/fs.h b/include/linux/fs.h index ae5685c31270..eb35363478e5 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2988,7 +2988,7 @@ extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); extern int generic_clone_checks(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, - uint64_t *count, bool is_dedupe); + uint64_t *count, unsigned int flags); extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); diff --git a/mm/filemap.c b/mm/filemap.c index f74391721234..013451b8017f 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2983,7 +2983,7 @@ EXPORT_SYMBOL(generic_write_checks); */ int generic_clone_checks(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, - uint64_t *req_count, bool is_dedupe) + uint64_t *req_count, unsigned int flags) { struct inode *inode_in = file_in->f_mapping->host; struct inode *inode_out = file_out->f_mapping->host; @@ -3005,7 +3005,7 @@ int generic_clone_checks(struct file *file_in, loff_t pos_in, size_out = i_size_read(inode_out); /* Dedupe requires both ranges to be within EOF. */ - if (is_dedupe && + if ((flags & CLONERANGE_DEDUPE) && (pos_in >= size_in || pos_in + count > size_in || pos_out >= size_out || pos_out + count > size_out)) return -EINVAL; @@ -3056,8 +3056,12 @@ int generic_clone_checks(struct file *file_in, loff_t pos_in, if (pos_in + count == size_in) { bcount = ALIGN(size_in, bs) - pos_in; } else { - if (!IS_ALIGNED(count, bs)) - return -EINVAL; + if (!IS_ALIGNED(count, bs)) { + if (flags & CLONERANGE_SHORT) + count = ALIGN_DOWN(count, bs); + else + return -EINVAL; + } bcount = count; } @@ -3068,6 +3072,13 @@ int generic_clone_checks(struct file *file_in, loff_t pos_in, pos_out < pos_in + bcount) return -EINVAL; + /* + * We shortened the request but the caller can't deal with that, so + * bounce the request back to userspace. + */ + if (*req_count != count && !(flags & CLONERANGE_SHORT)) + return -EINVAL; + *req_count = count; return 0; }