[linux-cifs-client] Re: unlocking part of a byte-range lock with, CIFS

[Jeff Layton]

On Fri, 24 Aug 2007 11:25:01 -0700
Jeremy Allison <jra at samba.org> wrote:

> On Fri, Aug 24, 2007 at 01:07:47PM -0400, Jeff Layton wrote:
> > 
> > Thanks. I don't want to take up your time, but it would be good to
> > settle whether this is completely unfixable...
> > 
> > I saw this in one of your slide decks, so I'm guessing this
> > is what you mean?
> > 
> > Locks can't overlap, or be split or merged
> >   (as they can in POSIX), but read locks can
> >   be "stacked" on top of a write lock.
> >   - So long as the same locking context is used.
> > 
> > Or is it more complicated than this? :-)
> 
> Nope - that's the issue, but that that behaviour prevents what
> you're tryign to do I think. If it's a read lock you can only
> delete the whole thing and race to get fragments of it, no 
> way to delete part of it atomically.
> 

Right, that sense then. Sounds like a CANTFIX sort of issue :-)

Thanks for the explanation...

-- 
Jeff Layton <jlayton at redhat.com>