Re: [PATCH 0/2] Shared flags

[Christoph Hellwig <hch@infradead.org>]

On Fri, Nov 14, 2008 at 03:37:12AM +0000, Jamie Lokier wrote:
> A generic mount option is currently used for mandatory locking - this
> is very similar.
> 
> The only different I see, for security, is with mandatory locking a
> process which doesn't want to get stuck can check the permission bits
> before opening a file.  But I'm not aware of anything actually doing this.

More importantly the admin can do it.  And mandatory locking doesn't
mean you can't remove something, with would be a complete nightmare.  It
also doesn't apply to directories, which from my reading of the patch
this one would do.  But yeah, doing the read/write part as as a special
case of mandlock on open might make some sense, but I'm still not too
convinced.

That more I think about these option the less I like the idea, it's just
going to cause a lot of problems to help with some wine issues that
hasn't even been explained yet.