tree a340f98eaec27ee75f264871ba878007d9c6e329
parent 817bf40265459578abc36c6bd53e27775b5c7ec4
author Dan Williams <dan.j.williams@intel.com> 1485547499 -0800
committer Dan Williams <dan.j.williams@intel.com> 1493151646 -0700

ext2, ext4, xfs: retrieve dax_device for iomap operations

In preparation for converting fs/dax.c to use dax_direct_access()
instead of bdev_direct_access(), add the plumbing to retrieve the
dax_device associated with a given block_device.

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