Re: File system awareness (or lack thereof) of vfs granting of leases

["J. Bruce Fields" <bfields@fieldses.org>]

On Tue, Feb 20, 2007 at 10:46:51AM -0500, Robert Rappaport wrote:
> >We also have the same problem with leases, since we're using leases to
> >implement NFSv4 delegations.  There's a simple-minded patch here:
> >
> >        http://linux-nfs.org/cgi-bin/gitweb.cgi?p=bfields-2.6.git;a=commitdiff;h=4e8aff5dabe07b2e4e95ef0c741a34f65409087f
> >
> >I'm not really sure if it's right.
> 
> Thank you both for your helpful replies.  In particular, the addition
> of the calls to file system specific functions in routines,
> fcntl_setlease() and break_lease(), as well as the modifications to
> the file_operations and inode_operations structures, pointed to by
> Bruce's reply, look exactly like the hooks that I would need to
> proceed to resolve my problems.  Is there any timetable established
> for these modifications to make it into a future release?  These hooks
> would clearly benefit any cluster file system that has to deal with
> leases.

We've been concentrating on the posix locks problem first, but that may
be done in time for 2.6.22.

If someone wants to help--we'll need to figure out how to implement this
for gfs2 and/or ocfs2.  And any review or testing (e.g. with Samba)
would be helpful.

--b.