Re: Make changes to read-only file system using RAM

[Brad Fitzpatrick]

Chris,

Check out unionfs.


On Tue, 21 Dec 2004, Chris Swanson wrote:

> Hi,
>
>     Has anyone seen any work done on a RAM based file system that
> stores only changes to what would otherwise have been a read-only file
> system?  For example, live Linux CD's rely on RAM file systems to
> store directories/files that must be modified, but the majority of the
> system is mounted read-only on the CD.  I was thinking it would be
> really nice if we could mount a read-only medium (like a CD) in
> read-write mode, and store only modifications in RAM.  This could give
> the illusion of a true read-write medium, and the RAM file system
> would just grow as more changes are made.
>     I have searched around a bit and found nothing like this.
> Unfortunately, I have no kernel programming experience (although I'd
> love to learn).  I was wondering if anyone has tried something similar
> in the past.  Also, if anyone with more experience can see any reason
> why this is impossible or impractical, I would love to hear it, before
> I come to the same conclusion many months down the line.
>
> Thanks for your time,
> Chris
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