[PATCH] lockmgr and VFS plans

Peter Holm peter at holm.cc
Wed Jan 9 13:01:16 PST 2008

On Wed, Jan 09, 2008 at 03:19:35PM +0100, Attilio Rao wrote:
> Hi,
> as previously explained in past e-mails, lockmgr() is going to face a
> massive restructuration.
> The work is progressing on two different rails: the former involves
> fixing consumers code in order to make it completely implementative
> details agnostic, in order to make it cleaner and more robust. The
> latter involves giving a good replacement for current functions and a
> faster implementation.
> lockmgr() is an old primitive widely used in our VFS subsystem, so
> this overhaul would involve someway VFS subsystem necessarilly, in
> particular about the former line of development.
> Part of this overhaul (for this preliminary stages) consists in
> removing the 'thread' argument from the lockmgr() interface which also
> means making useless the same argument about VFS functions (vn_lock,
> VOP_LOCK() and VOP_UNLOCK()). This removal can be done in a 'stacked'
> way and can be splitted in 2 different stages: the former will clean
> up only vn_lock() while the latter will be more aggressive and it will
> involve hardly VFS, fixing VOP_LOCK1() and VOP_UNLOCK(). This patch
> removes the 'thread' argument from vn_lock():
> http://people.freebsd.org/~attilio/vn_lock.diff

I'll try and test it this wekend.

> What I'm looking for is:
> - objections to this
> - testers (even if a small crowd alredy offered to test this patch)
> I test-compiled and runned LINT with this patch and it works
> perfectly, but a wider audience would be better.
> I also would appreciate a lot if people planning to do changes to
> lockmgr or VFS would coordinate their efforts with me, even on small
> changes.
> Thanks,
> Attilio
> -- 
> Peace can only be achieved by understanding - A. Einstein
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Peter Holm

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