kernel oplocks

William R. Knox wknox at
Tue Aug 29 13:51:26 GMT 2000

I had noticed similar behavior in my samba 2.0.7 install on Solaris 2.6.
I built the samba myself with gcc 2.8.1, and after installing, ran
testparm and saw that kernel oplocks was set to yes. Given that I didn't
think Solaris supported this yet (if ever), I set it to no in the
smb.conf. However, this still struck me as weird, and having seen
Wolfgang's note, I thought I would mention it as a likely looking bug.

			Bill Knox
			Senior Operating Systems Programmer/Analyst
			The MITRE Corporation

Wolfgang Kretzschmar wrote:
> I am a little bit confused about the kernel support for oplocks.
> man page of smb.conf:
> ----------------
> For UNIXs that support kernel based oplocks (currently only IRIX but
> hopefully also Linux and FreeBSD soon) this parameter allows the use
> of them to be turned on or off.
> This parameter defaults to "On" on systems that have the support, and
> "off" on systems that don't. You should never need to touch this
> parameter.
> ----------------
> The date of the man page ist 23 Oct 1998
> If I install the samba binaries (2.0.6) that come with Red Hat 6.2
> (linux kernel 2.2.14) kernel oplocks are set to "Yes" (not "On" or
> "Off")
> If I compile the samba sources from 2.0.7 on the same machine during
> configure some test programs regarding kernel oplocks are compiled,
> and all fail. In acconfig.h this line is generated:
> So I assume that my Linux box does not support kernel oplocks.
> When I run the just compiled samba and dump the configuration with
> testparm kernel oplocks are nevertheless set to "yes".
> I also compiled Samba 2.0.7 on UnixWare 7. The same line is generated
> in acconfig.h, but even here kernel oplocks are set to "yes".
> Obviously the man page of smb.conf is wrong.
> But are there any UNIXs besides IRIX that support kernel oplocks ?
> Wolfgang Kretzschmar

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