From patchwork Tue Dec 15 12:14:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ruan Shiyang X-Patchwork-Id: 11974685 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=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 41B9CC2BB48 for ; Tue, 15 Dec 2020 12:14:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D8C382078D for ; Tue, 15 Dec 2020 12:14:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D8C382078D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=cn.fujitsu.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 720156B007E; Tue, 15 Dec 2020 07:14:42 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 65D1D6B0080; Tue, 15 Dec 2020 07:14:42 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 487A48D0005; Tue, 15 Dec 2020 07:14:42 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0063.hostedemail.com [216.40.44.63]) by kanga.kvack.org (Postfix) with ESMTP id 330E96B007E for ; Tue, 15 Dec 2020 07:14:42 -0500 (EST) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id DB41C824999B for ; Tue, 15 Dec 2020 12:14:41 +0000 (UTC) X-FDA: 77595409962.19.horn26_5e0468527423 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin19.hostedemail.com (Postfix) with ESMTP id AF7EC1AD1B1 for ; Tue, 15 Dec 2020 12:14:41 +0000 (UTC) X-HE-Tag: horn26_5e0468527423 X-Filterd-Recvd-Size: 3217 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by imf43.hostedemail.com (Postfix) with ESMTP for ; Tue, 15 Dec 2020 12:14:40 +0000 (UTC) X-IronPort-AV: E=Sophos;i="5.78,420,1599494400"; d="scan'208";a="102420181" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 15 Dec 2020 20:14:36 +0800 Received: from G08CNEXMBPEKD06.g08.fujitsu.local (unknown [10.167.33.206]) by cn.fujitsu.com (Postfix) with ESMTP id 676E74CE1505; Tue, 15 Dec 2020 20:14:30 +0800 (CST) Received: from G08CNEXCHPEKD05.g08.fujitsu.local (10.167.33.203) by G08CNEXMBPEKD06.g08.fujitsu.local (10.167.33.206) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 15 Dec 2020 20:14:29 +0800 Received: from localhost.localdomain (10.167.225.141) by G08CNEXCHPEKD05.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 15 Dec 2020 20:14:29 +0800 From: Shiyang Ruan To: , , , CC: , , , , , , , , , Subject: [RFC PATCH v3 1/9] pagemap: Introduce ->memory_failure() Date: Tue, 15 Dec 2020 20:14:06 +0800 Message-ID: <20201215121414.253660-2-ruansy.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201215121414.253660-1-ruansy.fnst@cn.fujitsu.com> References: <20201215121414.253660-1-ruansy.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 676E74CE1505.A9C09 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@cn.fujitsu.com 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 block device where the error page locates in, and try to get the filesystem on this block device. And finally call filesystem handler to deal with the error. The filesystem will try to recover the corrupted data if possiable. Signed-off-by: Shiyang Ruan --- include/linux/memremap.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 79c49e7f5c30..0bcf2b1e20bd 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -87,6 +87,14 @@ 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 one page. Notify the processes + * who are using this page, and try to recover the data on this page + * if necessary. + */ + int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn, + int flags); }; #define PGMAP_ALTMAP_VALID (1 << 0)