Re: [RFC 0/7] [RFC] cramfs: fake write support

arnd@xxxxxxxx wrote:
Many existing systems currently use unionfs or aufs for this
purpose, by overlaying a tmpfs over a read-only file
system like cramfs, squashfs or iso9660. IMHO, it would
be a much nicer solution to not require unionfs for a simple
case like this, but rather have support for it in the file
system. If people find this useful, we can do the same in
other read-only file system.


I don't agree that it is nicer to do this in cramfs. I prefer the
technique of union of a tmpfs over some other fs because a single
solution that works with all filesystems is better than re-implementing
the same idea in multiple filesystems. Multiple implementations is a
recipe for bugs and feature mismatch.
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