BUG: Files are not accessible across filesystems

[t-lo]

Files stored in the FAT filesystem are not accessible from ext2, and vice versa. Clearly, this is a bug (and not a missing feature) 😈

[joshtriplett]

Having a simultaneously writable filesystem seems unlikely, but having a simultaneously readable read-only filesystem seems quite possible. The two filesystems could share data blocks of a read-only file.