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dax: introduce dax_direct_access()

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Replace bdev_direct_access() with dax_direct_access() that uses
dax_device and dax_operations instead of a block_device and
block_device_operations for dax. Once all consumers of the old api have
been converted bdev_direct_access() will be deleted.

Given that block device partitioning decisions can cause dax page
alignment constraints to be violated this also introduces the
bdev_dax_pgoff() helper. It handles calculating a logical pgoff relative
to the dax_device and also checks for page alignment.

Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2017-01-26 20:37:35 -08:00
commit b0686260fe
5 changed files with 57 additions and 0 deletions
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1
block/Kconfig
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@ -6,6 +6,7 @@ menuconfig BLOCK
default y
select SBITMAP
select SRCU
select DAX
help
Provide block layer support for the kernel.