Subject: Re: vnode locking procedure change to suport stacked fs's.
To: Bill Sommerfeld <>
From: Bill Studenmund <>
List: tech-kern
Date: 05/24/1999 19:29:05
On Mon, 24 May 1999, Bill Sommerfeld wrote:

> This is a good change.  
> However, I don't think it will be sufficient to cure many of the
> unionfs locking problems.  Fixing unionfs likely requires use of
> reader-writer locks, at least on directories.  (reader-writer locks
> will also improve MP scalability..).
> I also think that doing it right will require changing the lockmgr to
> support true read-intend-write locks...).
> (I'm interested in working on this for 1.5...)

Then we should get on it soon. I think Perry's plan had 1.5 coming out in
the fall, so... :-)

What did you have in mind?

Take care,