Subject: Re: Removing tmpfs' experimental status
To: Julio M. Merino Vidal <>
From: Steven M. Bellovin <>
List: tech-kern
Date: 10/22/2006 10:57:58
On Sun, 22 Oct 2006 15:59:41 +0200, "Julio M. Merino Vidal"
<> wrote:

> Hello,
> [ please CC me any replies ]
> Several people have suggested to remove the experimental status from
> tmpfs so that we can enable it by default in our kernels (not in
> sysinst, though).  I think it was martin@ who said that this would be
> fine but that we first should disable obviously broken functionality
> (read NFS support).  That seems wise advice so...
> Unless there are serious objections, I'll do this soon so that it can
> get into 4.0:
> - Change all kernel configurations to remove the 'experimental' status
>   from the TMPFS line.
> - Enable TMPFS by default on all GENERIC kernels.
> - Disable the tmpfs_vfstofh and tmpfs_fhtovfs vfsops so that tmpfs
>   does not support exporting.  (I'm making them optional through a
>   TMPFS_ENABLE_NFS macro so that people interested in fixing it can
>   quickly enable the missing bits.  Of course the macro will go away
>   when things work as expected.)
> - Add some notes in mount_tmpfs(8) BUGS section to explain this as
>   well as some other missing features.

As discussed a few months ago, it also has problems with openoffice --
openoffice can't read tmpfs directories to let you browse them.

		--Steven M. Bellovin,