Filesystem overlay ?

[Taavi Burns]

http://www.linuxjournal.com/article/7714

Kernel Korner - Unionfs: Bringing Filesystems Together
By Charles Wright on Fri, 2004-11-19 04:01.

Unionfs merges several directories into a single unified view. We
describe applications of Unionfs and also interesting implementation
aspects.

<snip>

 Copy-on-Write Unions

In the previous example of the ISO images, all of the branches in the
union were read-only; hence, the union itself was read-only. Unionfs
also can mix read-only and read-write branches. In this case, the
union as a whole is read-write, and Unionfs uses copy-on-write
semantics to give the illusion that you can modify files and
directories on read-only branches. This could be used to patch a
CD-ROM.


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taa
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