[resend PATCH v2 13/33] 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 --- fs/ext2/inode.c |9 - fs/ext4/inode.c |9 - fs/

[PATCH v2 13/33] 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 --- fs/ext2/inode.c |9 - fs/ext4/inode.c |9 - fs/