OpLocks and file sizes.

Jeremy Allison jra at samba.org
Fri Mar 30 17:22:04 MDT 2012

On Fri, Mar 30, 2012 at 06:02:59PM -0400, J. Bruce Fields wrote:
> On Fri, Mar 30, 2012 at 12:29:31PM +0200, Christian Ambach wrote:
> > On 03/27/2012 09:54 PM, Christopher R. Hertel wrote:
> > 
> > >That's also true for OpLock support in general.  It would be nice, for us,
> > >if the Linux kernel would only break leases for the same reasons that
> > >Windows does, but if there are additional reasons then the worst that will
> > >happen is that leases will be broken...so OpLocks will be broken.  That's
> > >not really too bad.
> > 
> > I recently gave Kernel 3.2 a chance to see if the fcntl lease
> > semantics have improved after Bruce's recent changes.
> > But especially downgrading still does not work as Samba would
> > require it: to downgrade from write lease to read lease requires
> > that the fd is open in R/O mode. Samba however might have the fd
> > open in R/W mode and so the downgrade fails.
> Bah, OK, thanks for the report.  Maybe we should change leases so that
> they never conflict with theopen that they're set on.

That would be a good idea for Samba, thanks !

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