Call to arms: MPSAFE file systems

[Josh Paetzel]

On 09/12/11 13:08, Robert Watson wrote:
>
> On Sat, 27 Aug 2011, Attilio Rao wrote:
>
>> With the aid of kib and rwatson I made a roughly outlined plan about
>> what is left to do in order to have all the filesystems locked (or
>> eventually dropped) before 10.0) and is summarized here:
>> http://wiki.freebsd.org/NONMPSAFE_DEORBIT_VFS
>
> Here's a more succinct summary of the key points from the wiki:
>
> FreeBSD has supported Giant lock-free file systems for years, and
> almost all file systems have been shipping "MPSAFE" for several
> years.  However, VFS retains compatibility support for non-MPSAFE file
> systems.  We want to remove that compatibility support, as it adds
> non-trivial complexity to an already quite complex VFS, simplifying
> the code and making it easier to maintain and enhance.  This means
> either fixing or removing any file systems that can't operate without
> compatibility support.
>
> Attilio has posted a schedule for the removal of compatibility
> crutches, which in turn means removing any un-updated file systems. 
> We are looking for volunteers to perform those updates.  Here's the
> schedule:
>
> 27 August 2011    Attilio posts plan on arch@
> 1 October 2011    Add VFS_GIANT_COMPATIBILITY option (enabled)
> 1 March 2012    Disable VFS_GIANT_COMPATIBILITY option by default
> 1 September 2012    Disconnect non-MPSAFE file systems from build
> 1 March 2013    Garbage collect any un-updated file systems
>
> Most of our critical file systems are already done: UFS, ZFS, the NFS
> client and server (both old and new), unionfs, pseudofs, tmpfs,
> nullfs, devfs, cd9660, ext2fs, fdescfs, msdosfs, udf, and procfs.
>
> However, some remain, and they require owners:
>
> File system    Owner    State
> coda        rwatson    Non-MPSAFE
> hpfs        ???    Non-MPSAFE
> ntfs        attilio    Non-MPSAFE
> nwfs        ???    Non-MPSAFE
> portalfs    ???    Non-MPSAFE
> smbfs        ???    Non-MPSAFE
> reiserfs    ???    Non-MPSAFE
> xfs        ???    Non-MPSAFE
>
> Any file system that remains on this list will be removed by 10.0 --
> so, if you care about one of the above file systems, please help us
> get them updated. You can find more information here, including on the
> methodology for making a file system MPSAFE, with worked examples:
>
>   http://wiki.freebsd.org/NONMPSAFE_DEORBIT_VFS
>
> Robert
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Robert,

As we discussed yesterday if you can facilitate a code drop of smbfs
I'll shepherd it into the tree.

-- 
Thanks,

Josh Paetzel
FreeBSD -- The power to serve