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Date: Sat, 12 May 2007 11:21:23 +0100
From: Tom Judge <tom@tomjudge.com>
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To: Philippe Laquet <stom@free.fr>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Any FBSD Filesystem with Mandatory Locks?
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Philippe Laquet wrote:
> 
> Dear All,
> 
> I a trying to get HAVP (it works almost well, great software!) but I 
> also need to use the streaming option and it needs a FS mounted with 
> mandatory locks. I did not found any option with UFS(2) and also tried 
> with ext2fs loaded but the mount_ext2fs does not support "-o mand" ... 
> Any idea?...
> 
> 
> My config : FBSD 6-STABLE
> GENERIC Kernel
> HAVP 0.85 (tuned makefile to compile the with STREAM function)
> 
> Tried with :
> mdconfig -a -t malloc -s32m
> mount_ext2fs -o mand /dev/md0 /tmp/havp (the "mand" option is not 
> recognized)
> 

I don't think that FreeBSD has mandatory file locks, I believe that all 
locks are advisory.  I may be wrong but this is what the section on 
file/descriptor locking in "The Design And Implementation of the FreeBSD 
  Operating System" seemed to suggest, this may have changed since 5.2 tho.

Tom