• Dan Williams's avatar
    dm: add dax_device and dax_operations support · f26c5719
    Dan Williams authored
    Allocate a dax_device to represent the capacity of a device-mapper
    instance. Provide a ->direct_access() method via the new dax_operations
    indirection that mirrors the functionality of the current direct_access
    support via block_device_operations.  Once fs/dax.c has been converted
    to use dax_operations the old dm_blk_direct_access() will be removed.
    
    A new helper dm_dax_get_live_target() is introduced to separate some of
    the dm-specifics from the direct_access implementation.
    
    This enabling is only for the top-level dm representation to upper
    layers. Converting target direct_access implementations is deferred to a
    separate patch.
    
    Cc: Toshi Kani <toshi.kani@hpe.com>
    Reviewed-by: default avatarMike Snitzer <snitzer@redhat.com>
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
    f26c5719
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