From patchwork Thu Apr 22 13:45:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12218513 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,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 DE593C43600 for ; Thu, 22 Apr 2021 13:45:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADF596145A for ; Thu, 22 Apr 2021 13:45:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236621AbhDVNqN (ORCPT ); Thu, 22 Apr 2021 09:46:13 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:4826 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S236570AbhDVNqJ (ORCPT ); Thu, 22 Apr 2021 09:46:09 -0400 IronPort-HdrOrdr: A9a23:/fQciaxJuV6fXtLJbYteKrPwzL1zdoIgy1knxilNYDZSddGVkN3roeQD2XbP+VIscVwDufTFAqmPRnvA6YV4iLN9AZ6OVBTr0VHHEKhM4YfuyDXrGWnf24dmv5tIXLN5DLTLbGRSqebfzE2GH807wN+BmZrY4Nv263t2VwllZ+VBwm5Ce2WmO3Z7TgVHGpY1faD0jqV6jgC9cncaZNnTPAhmY8H/obTw9K7OUFovAh4LzE20hyq01biSKXOl9yZbfzRR4bpKywT4rzA= X-IronPort-AV: E=Sophos;i="5.82,242,1613404800"; d="scan'208";a="107477157" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 22 Apr 2021 21:45:31 +0800 Received: from G08CNEXMBPEKD06.g08.fujitsu.local (unknown [10.167.33.206]) by cn.fujitsu.com (Postfix) with ESMTP id 8FF6D4D0B8AC; Thu, 22 Apr 2021 21:45:25 +0800 (CST) Received: from G08CNEXCHPEKD04.g08.fujitsu.local (10.167.33.200) by G08CNEXMBPEKD06.g08.fujitsu.local (10.167.33.206) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 22 Apr 2021 21:45:26 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD04.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 22 Apr 2021 21:45:25 +0800 From: Shiyang Ruan To: , , , CC: , , , , , , , , , Ritesh Harjani Subject: [PATCH v3 3/3] fsdax: Output address in dax_iomap_pfn() and rename it Date: Thu, 22 Apr 2021 21:45:01 +0800 Message-ID: <20210422134501.1596266-4-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210422134501.1596266-1-ruansy.fnst@fujitsu.com> References: <20210422134501.1596266-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 8FF6D4D0B8AC.A52EF 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 Add address output in dax_iomap_pfn() in order to perform a memcpy() in CoW case. Since this function both output address and pfn, rename it to dax_iomap_direct_access(). Signed-off-by: Shiyang Ruan Reviewed-by: Christoph Hellwig Reviewed-by: Ritesh Harjani Reviewed-by: Darrick J. Wong --- fs/dax.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index f99e33de2036..48a97905c0c3 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -998,8 +998,8 @@ static sector_t dax_iomap_sector(struct iomap *iomap, loff_t pos) return (iomap->addr + (pos & PAGE_MASK) - iomap->offset) >> 9; } -static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size, - pfn_t *pfnp) +static int dax_iomap_direct_access(struct iomap *iomap, loff_t pos, size_t size, + void **kaddr, pfn_t *pfnp) { const sector_t sector = dax_iomap_sector(iomap, pos); pgoff_t pgoff; @@ -1011,11 +1011,13 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size, return rc; id = dax_read_lock(); length = dax_direct_access(iomap->dax_dev, pgoff, PHYS_PFN(size), - NULL, pfnp); + kaddr, pfnp); if (length < 0) { rc = length; goto out; } + if (!pfnp) + goto out_check_addr; rc = -EINVAL; if (PFN_PHYS(length) < size) goto out; @@ -1025,6 +1027,12 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size, if (length > 1 && !pfn_t_devmap(*pfnp)) goto out; rc = 0; + +out_check_addr: + if (!kaddr) + goto out; + if (!*kaddr) + rc = -EFAULT; out: dax_read_unlock(id); return rc; @@ -1389,7 +1397,7 @@ static vm_fault_t dax_fault_actor(struct vm_fault *vmf, pfn_t *pfnp, return pmd ? VM_FAULT_FALLBACK : VM_FAULT_SIGBUS; } - err = dax_iomap_pfn(iomap, pos, size, &pfn); + err = dax_iomap_direct_access(iomap, pos, size, NULL, &pfn); if (err) return pmd ? VM_FAULT_FALLBACK : dax_fault_return(err);