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    Subject[PATCH v6 0/9] fsdax: introduce fs query to support reflink
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    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(-)

    --
    2.32.0



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