[Linux-cluster] Re: GFS, what's remaining

[Andrew Morton]

Alan Cox <alan at lxorguk.ukuu.org.uk> wrote:
>
> On Llu, 2005-09-05 at 02:19 -0700, Andrew Morton wrote:
>  > >   create_lockspace()
>  > >   release_lockspace()
>  > >   lock()
>  > >   unlock()
>  > 
>  > Neat.  I'd be inclined to make them syscalls then.  I don't suppose anyone
>  > is likely to object if we reserve those slots.
> 
>  If the locks are not file descriptors then answer the following:
> 
>  - How are they ref counted
>  - What are the cleanup semantics
>  - How do I pass a lock between processes (AF_UNIX sockets wont work now)
>  - How do I poll on a lock coming free. 
>  - What are the semantics of lock ownership
>  - What rules apply for inheritance
>  - How do I access a lock across threads.
>  - What is the permission model. 
>  - How do I attach audit to it
>  - How do I write SELinux rules for it
>  - How do I use mount to make namespaces appear in multiple vservers
> 
>  and thats for starters...

Return an fd from create_lockspace().