kernel support for open share modes

[David Collier-Brown]

On Fri, Feb 04, 2005 at 02:26:23PM -0500, J. Bruce Fields wrote:

>>I'm interested because we'd like to support something similar for NFSv4,
>>and it doesn't seem that existing kernel support is sufficient to do it
>>correctly.
>>
>>This looks like a hard problem, but I'd be curious whether anyone had
>>thought about it and had any ideas.

 
Jeremy Allison wrote:
> In Linux Samba makes a kernel call to flock to tell the kernel about
> Samba-related deny modes, but only on Linux. Look for the kernel_flock
> code in smbd/open.c. Samba handles deny modes in memory, and they are
> not coordinated with local access.

  Out of sheer unadulterated curiosity, is there a reason for
using flock on Linux and not on other Unixes?  I do recollect 
the O(n^4) problem on Solaris (:-)), but wonder if other 
Unices had bad behaviors as well.

--dave


-- 
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
davecb at spamcop.net           |                      -- Mark Twain