Re: [Fwd: Re: Samba and kernel oplocks - Smbmount]

["Oscar A. Valdez" <oscar.valdez@plastipak.com.sv>]

On my Samba server, the shares accessed via Dosemu are configured with 'oplocks = no' and 'level2 oplocks = no', because of particularitites of the shared application.

I haven't tried Dosemu on shares without those two options, but since
oplocks are a NetBios feature, I don't see why it shouldn't work.

Oscar

El jue, 29-08-2002 a las 12:54, Bart Oldeman escribió:
> On 29 Aug 2002, Stephen Lee wrote:
> 
> > On Thu, 2002-08-29 at 11:20, Oscar A. Valdez wrote:
> > > I don't know what version of the kernel comes with 1.1.3.2, but, like
> > > Bart said, your $_hdimage gets converted to an lredir'd drive, and if
> > > your kernel doesn't handle locks properly on lredir'd drives, you won't
> > > be able to set locks on C:
> > > 
> > > Bart, what version of the kernel comes with 1.1.3.2? Is it OK to use a
> > > higher version of kernel.sys with it?
> 
> There is no kernel that comes with 1.1.3.2 - it's just a development
> test version of DOSEMU. In general DOSEMU is FreeDOS kernel agnostic -
> though newer kernels tend to work better than older ones.
> 
> > > Oscar
> > 
> > Hmmm...does that mean I should be using Freedos and not DRDOS if I want
> > proper kernel locking? I hope Foxpro works well with Freedos!
> 
> FreeDOS should work just like DR-DOS in this respect but it never
> hurts to try FreeDOS.
> 
> In general DOS talks to DOSEMU lredir'ed drive through the redirector
> interface. This is a list of calls you can find in Ralf Brown's
> Interrupt List at INT2F/AX=11xx. It's a horrible interface because it
> wasn't designed as such - but we have to live with it to get proprietary
> DOSes to access lredir'ed drives.
> 
> The same redirector interface is what DOS uses to talk to network drives
> in general and with MSCDEX/(FD/SHSUCDEX)/NWCDEX for CDROM drives too.
> 
> FreeDOS kernels before ~2026 did not translate
> --------D-215C-------------------------------
> INT 21 - DOS 3.0+ - "FLOCK" - RECORD LOCKING
> into
> --------N-2F110A-----------------------------
> INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - LOCK/UNLOCK REGION OF FILE
> 
> That was the problem - the redirector interface is a relatively recent
> addition to FreeDOS. DR-DOS should not have this bug.
> 
> I suspect that the way that DOSEMU tries to implement DOS locking
> techniques is not compatible with mandatory locking on the Samba Unix
> side.
> 
> Bart


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