From patchwork Fri Jul 30 08:52:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12410643 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0922C70 for ; Fri, 30 Jul 2021 08:52:55 +0000 (UTC) IronPort-HdrOrdr: A9a23:NiX2cqnqx3FARrJ6zCopma8oMGzpDfIQ3DAbv31ZSRFFG/Fw9vre+MjzsCWYtN9/Yh8dcK+7UpVoLUm8yXcX2/h1AV7BZniEhILAFugLgrcKqAeQeREWmNQ86Y5QN4B6CPDVSWNxlNvG5mCDeOoI8Z2q97+JiI7lo0tQcQ== X-IronPort-AV: E=Sophos;i="5.84,281,1620662400"; d="scan'208";a="112070560" 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 G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id C2E894D0D49D; Fri, 30 Jul 2021 16:52:48 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 30 Jul 2021 16:52:49 +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 16:52:47 +0800 From: Shiyang Ruan To: , , , , , CC: , , , , , Subject: [PATCH v6 0/9] fsdax: introduce fs query to support reflink Date: Fri, 30 Jul 2021 16:52:36 +0800 Message-ID: <20210730085245.3069812-1-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.32.0 Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-yoursite-MailScanner-ID: C2E894D0D49D.A3ADA X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Spam-Status: No This patchset is aimed to support shared pages tracking for fsdax. Change from V5: - fix dax_load_pfn(), take locked,empty,zero dax entry into consideration - fix the usage of rwsem lock for dax_device's holder - fix build error reported by kernelbot - keep functionality of dax_{,dis}assocaite_entry() for filesystems doesn't have rmapbt feature - Rebased to v5.14-rc3 This patchset moves owner tracking from dax_assocaite_entry() to pmem device driver, by introducing an interface ->memory_failure() for struct pagemap. This interface is called by memory_failure() in mm, and implemented by pmem device. Then call holder operations to find the filesystem which the corrupted data located in, and call filesystem handler to track files or metadata associated with this page. Finally we are able to try to fix the corrupted data in filesystem and do other necessary processing, such as killing processes who are using the files affected. The call trace is like this: memory_failure() |* fsdax case |------------ |pgmap->ops->memory_failure() => pmem_pgmap_memory_failure() | dax_holder_notify_failure() => | dax_device->holder_ops->notify_failure() => | - xfs_dax_notify_failure() | - md_dax_notify_failure() | |* xfs_dax_notify_failure() | |-------------------------- | | xfs_rmap_query_range() | | xfs_currupt_helper() | | * corrupted on metadata | | try to recover data, call xfs_force_shutdown() | | * corrupted on file data | | try to recover data, call mf_dax_kill_procs() | |* md_dax_notify_failure() | |------------------------- | md_targets->iterate_devices() | md_targets->rmap() => linear_rmap() | dax_holder_notify_failure() |* normal case |------------- mf_generic_kill_procs() The fsdax & reflink support for XFS is not contained in this patchset. (Rebased on v5.14-rc3) == Shiyang Ruan (9): pagemap: Introduce ->memory_failure() dax: Introduce holder for dax_device mm: factor helpers for memory_failure_dev_pagemap pmem,mm: Implement ->memory_failure in pmem driver mm: Introduce mf_dax_kill_procs() for fsdax case xfs: Implement ->corrupted_range() for XFS dm: Introduce ->rmap() to find bdev offset md: Implement dax_holder_operations fsdax: add exception for reflinked files block/genhd.c | 56 +++++++++++ drivers/dax/super.c | 58 ++++++++++++ drivers/md/dm-linear.c | 20 ++++ drivers/md/dm.c | 126 ++++++++++++++++++++++++- drivers/nvdimm/pmem.c | 13 +++ fs/dax.c | 59 ++++++++---- fs/xfs/xfs_fsops.c | 5 + fs/xfs/xfs_mount.h | 1 + fs/xfs/xfs_super.c | 135 +++++++++++++++++++++++++++ include/linux/dax.h | 46 +++++++++ include/linux/device-mapper.h | 5 + include/linux/genhd.h | 1 + include/linux/memremap.h | 9 ++ include/linux/mm.h | 10 ++ mm/memory-failure.c | 169 +++++++++++++++++++++++----------- 15 files changed, 641 insertions(+), 72 deletions(-)