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    Subject[PATCH v2 00/10] fsdax: introduce fs query to support reflink
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    This patchset is aimed to support shared pages tracking for fsdax.

    Change from V1:
    - Add the old memory-failure handler back for rolling back
    - Add callback in MD's ->rmap() to support multiple mapping of dm device
    - Add judgement for CONFIG_SYSFS
    - Add pfn_valid() judgement in hwpoison_filter()
    - Rebased to v5.11-rc5

    Change from RFC v3:
    - Do not lock dax entry in memory failure handler
    - Add a helper function for corrupted_range
    - Add restrictions in xfs code
    - Fix code style
    - remove the useless association and lock in fsdax

    Change from RFC v2:
    - Adjust the order of patches
    - Divide the infrastructure and the drivers that use it
    - Rebased to v5.10

    Change from RFC v1:
    - Introduce ->block_lost() for block device
    - Support mapped device
    - Add 'not available' warning for realtime device in XFS
    - Rebased to v5.10-rc1

    This patchset moves owner tracking from dax_assocaite_entry() to pmem
    device driver, by introducing an interface ->memory_failure() of struct
    pagemap. This interface is called by memory_failure() in mm, and
    implemented by pmem device. Then pmem device calls its ->corrupted_range()
    to find the filesystem which the corrupted data located in, and call
    filesystem handler to track files or metadata assocaited 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()
    pgmap->ops->memory_failure() => pmem_pgmap_memory_failure()
    gendisk->fops->corrupted_range() => - pmem_corrupted_range()
    - md_blk_corrupted_range()
    sb->s_ops->currupted_range() => xfs_fs_corrupted_range()
    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_mapping_kill_procs()

    The fsdax & reflink support for XFS is not contained in this patchset.

    (Rebased on v5.11-rc5)

    Shiyang Ruan (10):
    pagemap: Introduce ->memory_failure()
    blk: Introduce ->corrupted_range() for block device
    fs: Introduce ->corrupted_range() for superblock
    mm, fsdax: Refactor memory-failure handler for dax mapping
    mm, pmem: Implement ->memory_failure() in pmem driver
    pmem: Implement ->corrupted_range() for pmem driver
    dm: Introduce ->rmap() to find bdev offset
    md: Implement ->corrupted_range()
    xfs: Implement ->corrupted_range() for XFS
    fs/dax: Remove useless functions

    block/genhd.c | 6 ++
    drivers/md/dm-linear.c | 20 ++++
    drivers/md/dm.c | 61 +++++++++++
    drivers/nvdimm/pmem.c | 44 ++++++++
    fs/block_dev.c | 42 +++++++-
    fs/dax.c | 63 ++++-------
    fs/xfs/xfs_fsops.c | 5 +
    fs/xfs/xfs_mount.h | 1 +
    fs/xfs/xfs_super.c | 109 +++++++++++++++++++
    include/linux/blkdev.h | 2 +
    include/linux/dax.h | 1 +
    include/linux/device-mapper.h | 5 +
    include/linux/fs.h | 2 +
    include/linux/genhd.h | 3 +
    include/linux/memremap.h | 8 ++
    include/linux/mm.h | 9 ++
    mm/memory-failure.c | 190 +++++++++++++++++++++++-----------
    17 files changed, 466 insertions(+), 105 deletions(-)

    --
    2.30.0



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