ZFS to support chflags?

[Kostik Belousov]

On Thu, Apr 12, 2007 at 02:38:33PM +0200, Oliver Fromme wrote:
> Ed Schouten wrote:
>  > Bernd Walter wrote:
>  > > E.g. hardlink system binaries over multiple jails flaged immuteable.
>  > > No jail can compromise the data in other jails, while still allowing
>  > > the kernel to share memory pages for it.
>  > 
>  > There are nicer ways to do that as far as I know. Just read-only
>  > nullmount some kind of base install to another directory.
> 
> Memory pages are not shared across different mounts,
> including nullmounts (AFAIK), which was Bernd's point.
> So Bernd's solution is much better in terms of memory
> usage, which is significant if you run a large number
> of jails.

Pages are shared for file mmaped from different null mounts.
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