Re: Overlay writable filesystem over r/o partition [long]
Benjamin LaHaise (kernel@kvack.org)
Tue, 6 Jan 1998 18:39:22 -0500 (EST)
On Tue, 6 Jan 1998, Theodore Y. Ts'o wrote:
...
> About the only ugly part of BSD's unionfs is that it requires libc
> support to avoid duplicate names from readdir(). The problem with doing
> this in the kernel is that it's really hard to have the kernel throw out
> duplicate names. (You can do it, but it would require lots of memory
> allocations, which you'd really rather not do in the kernel.)
That's the issue I found depressing last time I looked at doing unionfs (a
natural extension/replacement of the loopback filesystem)... So consider
the challenge accepted. ;-) I need to brush up on the new dentry code
anyways.
-ben