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Fri, 30 Jul 2021 18:02:00 +0800 From: Shiyang Ruan To: , , , , , Date: Fri, 30 Jul 2021 18:01:49 +0800 Message-ID: <20210730100158.3117319-1-ruansy.fnst@fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 8FBC94D0D49D.A3938 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Fri, 30 Jul 2021 09:53:42 -0400 Cc: snitzer@redhat.com, djwong@kernel.org, david@fromorbit.com, dan.j.williams@intel.com, hch@lst.de, agk@redhat.com Subject: [dm-devel] [PATCH RESEND v6 0/9] fsdax: introduce fs query to support reflink X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com This patchset is aimed to support shared pages tracking for fsdax. Changes for RESEND: - update the title of patch 6 - update the wrong email address of one receiver Changes 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 ->notify_failure() 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(-)