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

[Andrew Morton]

Alan Cox <alan at lxorguk.ukuu.org.uk> wrote:
>
> On Llu, 2005-09-05 at 12:53 -0700, Andrew Morton wrote:
>  > >  - 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().
> 
>  That only answers about four of the questions. The rest only come out if
>  create_lockspace behaves like a file system - in other words
>  create_lockspace is better known as either mkdir or mount.

But David said that "We export our full dlm API through read/write/poll on
a misc device.".  That miscdevice will simply give us an fd.  Hence my
suggestion that the miscdevice be done away with in favour of a dedicated
syscall which returns an fd.

What does a filesystem have to do with this?