Re: [PATCH] VFS: Unlink should revoke all outstanding leases on file

[Trond Myklebust <trond.myklebust@fys.uio.no>]

On Fri, 2010-05-14 at 13:59 -0400, Trond Myklebust wrote: 
> Note that the server should also recall the delegation if someone
> attempts to violate the guarantees that are listed in section 9.4: Open
> Delegation
> 
>    When a client has a read open delegation, it may not make any changes
>    to the contents or attributes of the file but it is assured that no
>    other client may do so.  When a client has a write open delegation,
>    it may modify the file data since no other client will be accessing
>    the file's data.  The client holding a write delegation may only
>    affect file attributes which are intimately connected with the file
>    data:  size, time_modify, change.
> 
> IOW: even if you hold a write delegation you are not allowed to change
> the file mode bits, owner, group or acls...

...or the nlink value. So technically, we should also recall the
delegation when someone creates or deletes a hard link. I think I need
to remind Tom that he should add that to the RFC3530bis draft...

Cheers
   Trond