[uml-devel] Fun little detail about /dev/shm.

[uml-devel] Fun little detail about /dev/shm.

[Rob Landley]

If you're using udev, then /dev is tmpfs.  So /dev/shm is trivially tmpfs.

:P

Rob
-- 
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I do not think it means what you think it means.


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Re: [uml-devel] Fun little detail about /dev/shm.

[Nix]

On Mon, 28 Nov 2005, Rob Landley prattled cheerily:
> If you're using udev, then /dev is tmpfs.  So /dev/shm is trivially tmpfs.

True enough; but some people mount /dev with a size of 0. (Admittedly if
they don't want to break POSIX shm they'd better damn well mount *another*
tmpfs on /dev/shm with a saner size limit...)

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Re: [uml-devel] Fun little detail about /dev/shm.

[Rob Landley]

On Tuesday 29 November 2005 04:52, Nix wrote:
> On Mon, 28 Nov 2005, Rob Landley prattled cheerily:
> > If you're using udev, then /dev is tmpfs.  So /dev/shm is trivially
> > tmpfs.
>
> True enough; but some people mount /dev with a size of 0.

That stopped working in 2.6.14.  Now size=0 specifies no size limit.  (Yeah, 
I'm annoyed about it too.  I complained.)

Thread starts here:
http://seclists.org/lists/linux-kernel/2005/Nov/0387.html

> (Admittedly if 
> they don't want to break POSIX shm they'd better damn well mount *another*
> tmpfs on /dev/shm with a saner size limit...)

In the patch I sent the error message was changed to say which directory it 
was upset about, but it should probably also hint that you can set TMPDIR to 
override this...

Rob
-- 
Steve Ballmer: Innovation!  Inigo Montoya: You keep using that word.
I do not think it means what you think it means.


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Re: [uml-devel] Fun little detail about /dev/shm.

[Blaisorblade]

On Tuesday 29 November 2005 11:52, Nix wrote:
> On Mon, 28 Nov 2005, Rob Landley prattled cheerily:
> > If you're using udev, then /dev is tmpfs.  So /dev/shm is trivially
> > tmpfs.

> True enough;
configurable on Gentoo - you can now specify a full mount line in /etc/fstab, 
and before you had an option for ramfs.

> but some people mount /dev with a size of 0. (Admittedly if 
> they don't want to break POSIX shm they'd better damn well mount *another*
> tmpfs on /dev/shm with a saner size limit...)

-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
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