Subject: re: phasing out mfs; make init(8) use tmpfs?
To: Christos Zoulas <email@example.com>
From: matthew green <firstname.lastname@example.org>
Date: 02/17/2007 05:29:38
In article <20070216000441.GN21463@che.ojctech.com>,
David Young <email@example.com> wrote:
>On Thu, Feb 15, 2007 at 11:55:51PM +0000, Geoff Wing wrote:
>> David Young <firstname.lastname@example.org> typed:
>> : Is there anywhere TMPFS cannot replace MFS, and work at least as well?
>> : If not, is it ok if we begin to phase MFS out?
>> It doesn't have whitespace objects (so you can't do upper layer union mounts
>> with it).
>Do you use union mounts in this way on /dev/, today, or is this purely
>hypothetical? I ask because I have never been able to rely on union
>mounts for anything, although it is my understanding that reliably may
>have improved with recent changes by Chuck Silvers.
fdesc is a union mount in /dev:
fdesc /dev fdesc rw,union 0 0
note that "union mount" and "unionfs" are separate things. one is
"mount -t union", one is "mount -o union".
a union mount (-o) has no requirement for whiteouts... this
functionality has been stable since ~forever. unionfs is the