From patchwork Tue May 11 03:09:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12249631 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C5D76C433B4 for ; Tue, 11 May 2021 03:10:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC1BF610F7 for ; Tue, 11 May 2021 03:10:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230217AbhEKDLd (ORCPT ); Mon, 10 May 2021 23:11:33 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:41077 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230198AbhEKDL2 (ORCPT ); Mon, 10 May 2021 23:11:28 -0400 IronPort-HdrOrdr: A9a23:jPfbyK8Qk534sxVhmvRuk+A+I+orL9Y04lQ7vn2YSXRuE/Bw8Pre5cjztCWE8Ar5N0tQ+uxoVJPufZqYz+8Q3WBzB8bFYOCFghrLEGgK1+KLqFeMdxEWtNQtspuIGJIfNDSfNzZHZL7BkWyF+sgbsaW62ZHtleHD1G1sUA0vT6lh6j1yAgGdHlYefng9ObMJUIqb+tFcpyetPVAebsGADHEDWOTZ4/LRkpaOW296OzcXrBmJkSiz6KP3VzyR3hIlWTtJxrs4tUjp+jaJnZmejw== X-IronPort-AV: E=Sophos;i="5.82,290,1613404800"; d="scan'208";a="108110563" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 11 May 2021 11:10:17 +0800 Received: from G08CNEXMBPEKD06.g08.fujitsu.local (unknown [10.167.33.206]) by cn.fujitsu.com (Postfix) with ESMTP id 7EDEB4D0BA79; Tue, 11 May 2021 11:10:12 +0800 (CST) Received: from G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) by G08CNEXMBPEKD06.g08.fujitsu.local (10.167.33.206) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 11 May 2021 11:10:02 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 11 May 2021 11:10:00 +0800 From: Shiyang Ruan To: , , , CC: , , , , , , , "Darrick J . Wong" Subject: [PATCH v5 4/7] iomap: Introduce iomap_apply2() for operations on two files Date: Tue, 11 May 2021 11:09:30 +0800 Message-ID: <20210511030933.3080921-5-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210511030933.3080921-1-ruansy.fnst@fujitsu.com> References: <20210511030933.3080921-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 7EDEB4D0BA79.A4007 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Some operations, such as comparing a range of data in two files under fsdax mode, requires nested iomap_open()/iomap_end() on two file. Thus, we introduce iomap_apply2() to accept arguments from two files and iomap_actor2_t for actions on two files. Signed-off-by: Shiyang Ruan Reviewed-by: Darrick J. Wong --- fs/iomap/apply.c | 52 +++++++++++++++++++++++++++++++++++++++++++ include/linux/iomap.h | 7 +++++- 2 files changed, 58 insertions(+), 1 deletion(-) diff --git a/fs/iomap/apply.c b/fs/iomap/apply.c index 26ab6563181f..0493da5286ad 100644 --- a/fs/iomap/apply.c +++ b/fs/iomap/apply.c @@ -97,3 +97,55 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags, return written ? written : ret; } + +loff_t +iomap_apply2(struct inode *ino1, loff_t pos1, struct inode *ino2, loff_t pos2, + loff_t length, unsigned int flags, const struct iomap_ops *ops, + void *data, iomap_actor2_t actor) +{ + struct iomap smap = { .type = IOMAP_HOLE }; + struct iomap dmap = { .type = IOMAP_HOLE }; + loff_t written = 0, ret, ret2 = 0; + loff_t len1 = length, len2, min_len; + + ret = ops->iomap_begin(ino1, pos1, len1, flags, &smap, NULL); + if (ret) + goto out; + if (WARN_ON(smap.offset > pos1)) { + written = -EIO; + goto out_src; + } + if (WARN_ON(smap.length == 0)) { + written = -EIO; + goto out_src; + } + len2 = min_t(loff_t, len1, smap.length); + + ret = ops->iomap_begin(ino2, pos2, len2, flags, &dmap, NULL); + if (ret) + goto out_src; + if (WARN_ON(dmap.offset > pos2)) { + written = -EIO; + goto out_dest; + } + if (WARN_ON(dmap.length == 0)) { + written = -EIO; + goto out_dest; + } + min_len = min_t(loff_t, len2, dmap.length); + + written = actor(ino1, pos1, ino2, pos2, min_len, data, &smap, &dmap); + +out_dest: + if (ops->iomap_end) + ret2 = ops->iomap_end(ino2, pos2, len2, + written > 0 ? written : 0, flags, &dmap); +out_src: + if (ops->iomap_end) + ret = ops->iomap_end(ino1, pos1, len1, + written > 0 ? written : 0, flags, &smap); +out: + if (written) + return written; + return ret ?: ret2; +} diff --git a/include/linux/iomap.h b/include/linux/iomap.h index c87d0cb0de6d..95562f863ad0 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -150,10 +150,15 @@ struct iomap_ops { */ typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len, void *data, struct iomap *iomap, struct iomap *srcmap); - +typedef loff_t (*iomap_actor2_t)(struct inode *ino1, loff_t pos1, + struct inode *ino2, loff_t pos2, loff_t len, void *data, + struct iomap *smap, struct iomap *dmap); loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags, const struct iomap_ops *ops, void *data, iomap_actor_t actor); +loff_t iomap_apply2(struct inode *ino1, loff_t pos1, struct inode *ino2, + loff_t pos2, loff_t length, unsigned int flags, + const struct iomap_ops *ops, void *data, iomap_actor2_t actor); ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from, const struct iomap_ops *ops);