handle special file type in tmpfs

[Brooks Davis]

On Thu, Apr 19, 2007 at 01:02:25AM -0700, Howard Su wrote:
> >Glen wrote:
> >> * Quota support, ACL work is pending
> Do we really need this? What's user scenerio to use Quota or ACL for a
> TMPFS? I can be conveienced.

Extended attribute support would be useful on systems that use MAC so
you wouldn't lose labels when copying files to the tmpfs (not having
this might preclude use).

Quotas a very useful on /tmp as a way to keep individual users from
DoSing the system.  I've had it happen by accident on my cluster where
users wrote temporary files and didn't clean them up.  At some point
they totally ran the volume out of space and as a result PVM and MPI
would fail very strangly when they couldn't create various files then
needed.

Having argued for these features, I don't believe either is critical.
For most application neither is needed, but they would be useful in some
cases.

-- Brooks
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