Giving a VFS a chance to be told that an oplock break is occurring

[Volker Lendecke]

On Tue, Mar 27, 2012 at 07:51:09PM -0700, Richard Sharpe wrote:
> > Definitely widen out to samba-technical... I'm CC:ing vl on the
> > reply for his thoughts, I know he's spent more time thinking about
> > async issues in the VFS than I have.
> 
> If you are doing read-ahead or write-behind in a VFS module and an
> oplock break occurs then you need to know about it, it seems to me,
> either to invalidate or flush ...

With the current oplock architecture, isn't it possible also
messaging_register for a MSG_SMB_BREAK_REQUEST with a
different handler? This way you will get the Samba-internal
oplock breaks. You could also very cheaply compare
fsp->oplock_type with a value cached locally in your module.
If that changes, a break has happened.

Volker

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