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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