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: 11974759 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 03CCCC4361B for ; Tue, 15 Dec 2020 12:30:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B5F2A224D4 for ; Tue, 15 Dec 2020 12:30:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729083AbgLOMaA (ORCPT ); Tue, 15 Dec 2020 07:30:00 -0500 Received: from mail.cn.fujitsu.com ([183.91.158.132]:22820 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728606AbgLOMPm (ORCPT ); Tue, 15 Dec 2020 07:15:42 -0500 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 Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org 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)