OpLocks and file sizes.

[J. Bruce Fields]

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.

--b.