From patchwork Fri Jul 30 08:52:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12410759 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 8C315C43214 for ; Fri, 30 Jul 2021 08:52:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CD8C36103B for ; Fri, 30 Jul 2021 08:52:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CD8C36103B 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 C67118D0001; Fri, 30 Jul 2021 04:52:56 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C192C6B005D; Fri, 30 Jul 2021 04:52:56 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B05CD8D0001; Fri, 30 Jul 2021 04:52:56 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0203.hostedemail.com [216.40.44.203]) by kanga.kvack.org (Postfix) with ESMTP id 951116B0036 for ; Fri, 30 Jul 2021 04:52:56 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 2CC061846F5DF for ; Fri, 30 Jul 2021 08:52:56 +0000 (UTC) X-FDA: 78418639152.01.776E668 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf03.hostedemail.com (Postfix) with ESMTP id 5A0F030000BC for ; Fri, 30 Jul 2021 08:52:54 +0000 (UTC) IronPort-HdrOrdr: A9a23:/bXRoatMwuDDEEGi9Nk4VGJ27skDStV00zEX/kB9WHVpm62j5qSTdZEguCMc5wx+ZJheo7q90cW7IE80lqQFhLX5X43SPzUO0VHARO5fBODZsl/d8kPFltJ15ONJdqhSLJnKB0FmsMCS2mKFOudl7N6Z0K3Av4vj80s= X-IronPort-AV: E=Sophos;i="5.84,281,1620662400"; d="scan'208";a="112070559" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 30 Jul 2021 16:52:52 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 797D44D0D4A3; Fri, 30 Jul 2021 16:52:50 +0800 (CST) Received: from G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 30 Jul 2021 16:52:52 +0800 Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXJMPEKD02.g08.fujitsu.local (10.167.33.202) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 30 Jul 2021 16:52:50 +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 16:52:48 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , Subject: [PATCH v6 1/9] pagemap: Introduce ->memory_failure() Date: Fri, 30 Jul 2021 16:52:37 +0800 Message-ID: <20210730085245.3069812-2-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 X-yoursite-MailScanner-ID: 797D44D0D4A3.A11DE X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5A0F030000BC Authentication-Results: imf03.hostedemail.com; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=fujitsu.com (policy=none); spf=none (imf03.hostedemail.com: domain of ruansy.fnst@fujitsu.com has no SPF policy when checking 183.91.158.132) smtp.mailfrom=ruansy.fnst@fujitsu.com X-Stat-Signature: yp1xqromktktxo7pes4iefqfeccu5xd9 X-HE-Tag: 1627635174-106702 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: When memory-failure occurs, we call this function which is implemented by each kind of devices. For the fsdax case, pmem device driver implements it. Pmem device driver will find out the filesystem in which the corrupted page located in. And finally call filesystem handler to deal with this error. The filesystem will try to recover the corrupted data if necessary. Signed-off-by: Shiyang Ruan --- include/linux/memremap.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index c0e9d35889e8..ed6980087db5 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -87,6 +87,15 @@ struct dev_pagemap_ops { * the page back to a CPU accessible page. */ vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf); + + /* + * Handle the memory failure happens on a range of pfns. Notify the + * processes who are using these pfns, and try to recover the data on + * them if necessary. The flag is finally passed to the recover + * function through the whole notify routine. + */ + int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn, + unsigned long nr_pfns, int flags); }; #define PGMAP_ALTMAP_VALID (1 << 0)