btrfs: Add function to distinguish between data and btree inode

This will be used in future patches that remove the optional
extent_io_ops callbacks.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1 file changed