From mboxrd@z Thu Jan 1 00:00:00 1970 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=ham 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 B7F31C4338F for ; Fri, 30 Jul 2021 08:53:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6B8BF61008 for ; Fri, 30 Jul 2021 08:53:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6B8BF61008 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=fujitsu.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 191248E0008; Fri, 30 Jul 2021 04:53:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1415E8E0001; Fri, 30 Jul 2021 04:53:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 02FE78E0008; Fri, 30 Jul 2021 04:53:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0243.hostedemail.com [216.40.44.243]) by kanga.kvack.org (Postfix) with ESMTP id DCA538E0001 for ; Fri, 30 Jul 2021 04:53:38 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 977AE180AE800 for ; Fri, 30 Jul 2021 08:53:38 +0000 (UTC) X-FDA: 78418640916.15.36DBBB5 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf24.hostedemail.com (Postfix) with ESMTP id CF2D4B002388 for ; Fri, 30 Jul 2021 08:53:37 +0000 (UTC) IronPort-HdrOrdr: =?us-ascii?q?A9a23=3AqWQDZaNjJ6bxy8BcTv2jsMiBIKoaSvp037BL?= =?us-ascii?q?7TEUdfUxSKGlfq+V8sjzqiWftN98YhAdcLO7Scy9qBHnhP1ICOAqVN/MYOCMgh?= =?us-ascii?q?rLEGgN1+vf6gylMyj/28oY7q14bpV5YeeaMXFKyer8/ym0euxN/OW6?= X-IronPort-AV: E=Sophos;i="5.84,281,1620662400"; d="scan'208";a="112070667" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 30 Jul 2021 16:53:36 +0800 Received: from G08CNEXMBPEKD06.g08.fujitsu.local (unknown [10.167.33.206]) by cn.fujitsu.com (Postfix) with ESMTP id 89F754D0D498; Fri, 30 Jul 2021 16:53:30 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD06.g08.fujitsu.local (10.167.33.206) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 30 Jul 2021 16:53:24 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 30 Jul 2021 16:53:24 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , Subject: [PATCH v6 9/9] fsdax: add exception for reflinked files Date: Fri, 30 Jul 2021 16:52:45 +0800 Message-ID: <20210730085245.3069812-10-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210730085245.3069812-1-ruansy.fnst@fujitsu.com> References: <20210730085245.3069812-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain X-yoursite-MailScanner-ID: 89F754D0D498.A0610 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com Authentication-Results: imf24.hostedemail.com; dkim=none; spf=none (imf24.hostedemail.com: domain of ruansy.fnst@fujitsu.com has no SPF policy when checking 183.91.158.132) smtp.mailfrom=ruansy.fnst@fujitsu.com; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=fujitsu.com (policy=none) X-Rspamd-Server: rspam02 X-Stat-Signature: 4qnh9ru56uhfiyk3x3un5czazxgioewq X-Rspamd-Queue-Id: CF2D4B002388 X-HE-Tag: 1627635217-24011 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: For reflinked files, one dax page may be associated more than once with different fime mapping and index. It will report warning. Now, since we have introduced dax-RMAP for this case and also have to keep its functionality for other filesystems who are not support rmap, I add this exception here. Signed-off-by: Shiyang Ruan --- fs/dax.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index dce6307a12eb..f5910d178695 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -352,9 +352,10 @@ static void dax_associate_entry(void *entry, struct = address_space *mapping, for_each_mapped_pfn(entry, pfn) { struct page *page =3D pfn_to_page(pfn); =20 - WARN_ON_ONCE(page->mapping); - page->mapping =3D mapping; - page->index =3D index + i++; + if (!page->mapping) { + page->mapping =3D mapping; + page->index =3D index + i++; + } } } =20 @@ -370,9 +371,10 @@ static void dax_disassociate_entry(void *entry, stru= ct address_space *mapping, struct page *page =3D pfn_to_page(pfn); =20 WARN_ON_ONCE(trunc && page_ref_count(page) > 1); - WARN_ON_ONCE(page->mapping && page->mapping !=3D mapping); - page->mapping =3D NULL; - page->index =3D 0; + if (page->mapping =3D=3D mapping) { + page->mapping =3D NULL; + page->index =3D 0; + } } } =20 --=20 2.32.0