[Samba] locking and gfs

[Scott Lovenberg]

Volker Lendecke wrote:
> On Sat, Feb 09, 2008 at 11:31:59PM +0100, Markus Neis wrote:
>
>   
>> Damn! this doesn't sound good. I hope somebody else can
>> refute what you say ;-) 
>> gfs shouldn't be that slow. I'm really confused.
>>     
>
> No offense intended, but Scott's description is not really
> correct. The only parameter that should really matter is
> "posix locking". That is the parameter that controls whether
> locking is being passed down to GFS. Set that one to no, and
> GFS will not see any locking requests while the Windows
> client gets the full semantics. You should NOT touch any of
> the other locking parameters.
>
> What I said however only applies to a single node. If you
> want to share the same file space via different nodes,
> "posix locking = yes" will NOT help you, then you need to
> look at http://ctdb.samba.org/. Even with "posix locking =
> yes" you will inevitably get data corruption if clients
> access the same file space via different nodes, ctdb will
> help you around that.
>
> Volker
>   
No offense taken, I misunderstood.

Just to clarify, the locking semantics (regardless of type) do not 
propagate down to the kernel smb module, but rather pass to the 
underlying file system (which in turn propagates to its own kernel 
module)?  Thanks, Volker.