[Samba] A samba locking question

[Patrik Gustavsson]

Yes, your are wright. But Samba will not
do a byte ranged lock using fcntl() on the file
when lock range is below 2^31 as stated in the docs.

/Patrik


On tis, 2004-02-10 at 00:22, Jeremy Allison wrote:
> On Thu, Feb 05, 2004 at 09:25:25AM +0100, Patrik Gustavsson wrote:
> > 
> > The things that tricked me was that I read the docs
> > for Samba 3 regarding locks.
> > 
> > And it says in the third paragraph in section 14.2
> > 
> > "Samba 2.2 and above implements record locking completely independent
> > of the underlying UNIX system. If a byte range lock that the client
> > requests happens to fall into the range of 0-2^31, Samba hands this
> > request down to the UNIX system. All other locks cannot be seen by
> > UNIX, anyway"
> > 
> > I interperted that Samba would do fcntl locks on the file if the request
> > is below 2^31 and not if it is above.
> > Which are not true.
> > 
> > Secondly, I don't understand why Samba is checking if a file
> > locked through fcntl before opening it, when it is not locking 
> > the file through fcntl when Samba is opening the file.
> 
> Samba doesn't use fcntl to check locks before opening, that's what
> share modes are for. fcntl locks are for byte range lock mapping
> onto POSIX.
> 
> Jeremy.
-- 
"In a world without fences who needs Gates"
Patrik Gustavsson, Senior Technical Consultant
patrik.gustavsson at sun.com     Telephone: +46 60 671540
http://glen.sweden            Mobile: +46 70 3551040
SUN MICROSYSTEMS              Fax: +46 60 671550
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