Re: [uml-devel] hostfs as root

[Matt Zimmerman <mdz@debian.org>]

On Fri, Sep 05, 2003 at 11:50:50AM -0400, Michael Richardson wrote:

> >>>>> "Matt" == Matt Zimmerman <mdz@debian.org> writes:
>     Matt> Sounds like a recipe for lots of race conditions.
> 
>   Uh, how?
>   Remember, this is in the kernel. We have locks.

There is not currently a lock held by hostfs_file_open that I see; this does
not seem like sufficient reason to make it impossible to do two opens
simultaneously.

>   If two UMLs come along, using the same rootfs, well, that's a different
> problem. 

It's the same problem, and it affects any shared hostfs, not only root
(unless you were planning to add a test for that).

>     Matt> You must have already worked around some other problems in order to
>     Matt> run potato in this configuration; it wouldn't work out of the box
>     Matt> with a 2.4 kernel.  How are you managing device nodes?  Loading any
>     Matt> kernel modules?
> 
>   Works fine for me.
>   It has been working fine for two years now.

What works fine?  The modutils in potato doesn't support 2.4 kernels,
only root is allowed to create device nodes in the host filesystem, and the
paths in /etc/inittab and everywhere else won't exist with devfs unless
devfsd is running.  You're obviously working around these problems.

-- 
 - mdz


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