Sharing files between file systems.

[Don Cupp]

So I have a very inconvenient use case for a LiveCD distro. 

We can't do the normal thing of a basic initrd and switchroot, we have to put 
everything in the initrd. This can vary between 250mb and 1.2gb and it's very 
inconvenient to place that file in the ISO9660fs, as well as the EFI El Torito 
target. So the EFI is just a vfat formatted loop file that is stored in the 
ISO9660fs, an FS within an FS. What I'm wondering, is there anyway to share the 
files between the parent iso9660fs and the container fs that makes up the El 
Torito target?