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=-1.4 required=3.0 tests=BAYES_50, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 8265FC433C1 for ; Wed, 24 Mar 2021 07:47:58 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DFF08619FB for ; Wed, 24 Mar 2021 07:47:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DFF08619FB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 7ACBF100EB348; Wed, 24 Mar 2021 00:47:57 -0700 (PDT) Received-SPF: None (mailfrom) identity=mailfrom; client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver= Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 77FA7100EB32A for ; Wed, 24 Mar 2021 00:47:55 -0700 (PDT) Received: by verein.lst.de (Postfix, from userid 2407) id 6BC6D68B02; Wed, 24 Mar 2021 08:47:51 +0100 (CET) Date: Wed, 24 Mar 2021 08:47:51 +0100 From: Christoph Hellwig To: Dan Williams Subject: Re: [PATCH v3 01/11] pagemap: Introduce ->memory_failure() Message-ID: <20210324074751.GA1630@lst.de> References: <20210208105530.3072869-1-ruansy.fnst@cn.fujitsu.com> <20210208105530.3072869-2-ruansy.fnst@cn.fujitsu.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Message-ID-Hash: KRQ7AGVVP2VDO6ZR4TZGW3TNFJLFAQJR X-Message-ID-Hash: KRQ7AGVVP2VDO6ZR4TZGW3TNFJLFAQJR X-MailFrom: hch@lst.de X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: "ruansy.fnst@fujitsu.com" , Linux Kernel Mailing List , linux-xfs , linux-nvdimm , Linux MM , linux-fsdevel , device-mapper development , "Darrick J. Wong" , david , Christoph Hellwig , Alasdair Kergon , Mike Snitzer , Goldwyn Rodrigues , "qi.fuli@fujitsu.com" , "y-goto@fujitsu.com" X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Tue, Mar 23, 2021 at 07:19:28PM -0700, Dan Williams wrote: > So I think the path forward is: > > - teach memory_failure() to allow for ranged failures > > - let interested drivers register for memory failure events via a > blocking_notifier_head Eww. As I said I think the right way is that the file system (or other consumer) can register a set of callbacks for opening the device. I have a series I need to finish and send out to do that for block devices. We probably also need the concept of a holder for the dax device to make it work nicely, as otherwise we're going to have a bit of a mess. > This obviously does not solve Dave's desire to get this type of error > reporting on block_devices, but I think there's nothing stopping a > parallel notifier chain from being created for block-devices, but > that's orthogonal to requirements and capabilities provided by > dax-devices. FYI, my series could easily accomodate that if we ever get a block driver that actually could report such errors. _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org