dm: add dax_device and dax_operations support

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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: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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This commit is contained in:

Dan Williams 2017-04-12 12:35:44 -07:00

parent b0686260fe

commit f26c5719b2

4 changed files with 73 additions and 14 deletions

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1

drivers/md/Kconfig

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1

drivers/md/dm-core.h

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86

drivers/md/dm.c

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1

include/linux/device-mapper.h

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