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=-2.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 445CFC43441 for ; Wed, 21 Nov 2018 03:27:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0096E21104 for ; Wed, 21 Nov 2018 03:27:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=zoho.com header.i=yehs2007@zoho.com header.b="M4gwlqyb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0096E21104 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=zoho.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728092AbeKUOAN (ORCPT ); Wed, 21 Nov 2018 09:00:13 -0500 Received: from sender-pp-092.zoho.com ([135.84.80.237]:25415 "EHLO sender-pp-092.zoho.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727092AbeKUOAN (ORCPT ); Wed, 21 Nov 2018 09:00:13 -0500 ARC-Seal: i=1; a=rsa-sha256; t=1542770832; cv=none; d=zoho.com; s=zohoarc; b=bFhncskcP7fb0105ABDouH6A1Px0oFAqRstK/SCMBQSVDvw1C6B9vxtuuc2ykzkifB/+CW61r93ubAMouptZh+B8ku0eiDRVopO7qOfzRQMo6e57DgGIUpUFDahBHTWPSGmPU70NF0rzPC4NtrlJJxXHZFVk6DttKu0vxRoSsEY= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1542770832; h=Cc:Date:From:Message-ID:Subject:To:ARC-Authentication-Results; bh=RlKVwpvHCjZ1SDlUa5wjbUP+HlpARBKConxYOYaQty4=; b=kl8ipXGkk3KQ+EeXIOrY0qxPN/hG7EA/8/HyHGcQLC0sPwqb6cpgC5XhHldQNzgeg4QAZCtg0D1tSMQnH9PZIyYhRu9dy+8OLIqr9/H6nVH8moJD8G07GOoWylkHsnjV6mZ7CfaLgAbCdsSFJOFWqKwpdUAsl9yBbOdZjrCRMNM= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=pass header.i=zoho.com; spf=pass smtp.mailfrom=yehs2007@zoho.com; dmarc=pass header.from= header.from= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=zapps768; d=zoho.com; h=from:to:cc:subject:date:message-id; b=ZtEa9lLlMgCmKqMoHJWaofmDIoeZJlc/kQS/evaTl6ANeu2vIGkYE6OT1yEfSrB9AKbGGU9XFBA3 4PLOBKnzHZ6zXcmsb9xvaGPlE5ye+Xgm6maJH2Ik0be+Bce5R9tZ DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1542770832; s=default; d=zoho.com; i=yehs2007@zoho.com; h=From:To:Cc:Subject:Date:Message-Id; l=2048; bh=RlKVwpvHCjZ1SDlUa5wjbUP+HlpARBKConxYOYaQty4=; b=M4gwlqybHbPsXMPMkEDJLWngpUNCdgWJP7yfTicCzXHoi3yvLYWFeESFQtn/mRWt p/k6sWJGBWuLvMmpMNdixJ5wdbkTfkut+JJt2q21R2Vavf/aSfTUWF5vv9STeQ/MxOO mkz55V3Lj2PxSYiAcRk+x6TSB7r50ZvNSN/i/i0g= Received: from YEHS1XR956R00D1.lenovo.com (58.243.153.247 [58.243.153.247]) by mx.zohomail.com with SMTPS id 1542770831193408.0950458479167; Tue, 20 Nov 2018 19:27:11 -0800 (PST) From: Huaisheng Ye To: linux-nvdimm@lists.01.org, agk@redhat.com, snitzer@redhat.com, dm-devel@redhat.com, dan.j.williams@intel.com, willy@infradead.org, zwisler@kernel.org, jack@suse.cz, dave.jiang@intel.com, vishal.l.verma@intel.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, chengnt@lenovo.com, Huaisheng Ye Subject: [RFC PATCH v2 0/3] realize dax_operations for dm-snapshot Date: Wed, 21 Nov 2018 11:26:59 +0800 Message-Id: <20181121032702.3048-1-yehs2007@zoho.com> X-Mailer: git-send-email 2.17.0.windows.1 X-ZohoMailClient: External Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Huaisheng Ye Changes v1->v2: Add NULL funtions for origin_dax_direct_access and origin_dax_copy_from/to_iter in order to avoid building error when CONFIG_DAX_DRIVER has NOT been enabled. [v1]: https://lkml.org/lkml/2018/11/20/759 This series patches are used to realize the dax_operations for dm-snapshot with persistent memory device. Here are the steps about how to verify the function. 1. Configure the persistent memory to fs-dax mode and create namespace with ndctl; 2. find them in /dev; # ndctl list { "dev":"namespace0.0", "mode":"fsdax", "map":"dev", "size":132118478848, "sector_size":512, "blockdev":"pmem0", "name":"yhs_pmem0", "numa_node":0 }, 3. create lv_pmem (here is 4G size) for testing; # pvcreate /dev/pmem0 # vgcreate vg_pmem /dev/pmem0 # lvcreate -L 4G -n lv_pmem vg_pmem 4. create filesystem (ext2 or ext4) to /dev/pmem0 # mkfs.ext2 -b 4096 /dev/vg_pmem/lv_pmem 5. mount pmem with DAX way; # mkdir /mnt/lv_pmem # mount -o dax /dev/vg_pmem/lv_pmem /mnt/lv_pmem/ 6. cp some files to /mnt/lv_pmem; # cp linear_table03.log /mnt/lv_pmem/ # cp test0.log /mnt/lv_pmem/ 7. create snapshot for test (here I limit it to 1G size); # lvcreate -L 1G -n snap_pmem -s /dev/vg_pmem/lv_pmem 8. modify the files copied with vim or copy more other new files; # vim /mnt/lv_pmem/test0.log 9. umount the pmem device; # umount /mnt/lv_pmem/ 10.merge the snapshot back to origin; # lvconvert --merge /dev/vg_pmem/snap_pmem 11.mount pmem device again for checking the content of files; # mount -o dax /dev/vg_pmem/lv_pmem /mnt/lv_pmem/ Huaisheng Ye (3): dm: enable dax_operations for dm-snapshot dm: expand hc_map in mapped_device for lack of map dm: expand valid types for dm-ioctl drivers/md/dm-core.h | 1 + drivers/md/dm-ioctl.c | 4 +++- drivers/md/dm-snap.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++-- drivers/md/dm.c | 15 +++++++++++++++ 4 files changed, 68 insertions(+), 3 deletions(-) -- 1.8.3.1