nfs no longer reconnects for udp sockets

[Alfred Perlstein]

* Adam Jacob Muller <lists at adam.gs> [080316 18:43] wrote:
> Ah, Very nice, I have been hitting this issue for a while now but had  
> not completely realized what was causing it.
> Will have to set aside some time to test this but the patch looks good  
> (it's 50% comments so I can understand what you are doing anyway :)).
> 
> "Please don't break this, it's annoying."
> Indeed, this bug is quite annoying.
> 
> Thanks for your work on this (and, obviously, the work you did on the  
> reconnect support prior).

Can you give me an ETA on testing?  If it's soon I can hold off
committing for your feedback and that would help much.

Don't forget you need to use UDP. :)

-Alfred

> 
> -Adam
> 
> 
> On Mar 14, 2008, at 6:01 AM, Alfred Perlstein wrote:
> 
> >Hey guys, someone was having issues with NFS mounts and
> >I happened to notice that it appears that the
> >"reconnect if socket went south" semantics I added a few
> >years ago were basically disabled by the nfs optimizations
> >added for "recv side processing".
> >
> >The problem is as such:
> >
> >You have an NFS mount on UDP.
> >Somehow the route goes bad.
> >The UDP socket is now "broken" as the route will remain
> >hosed forever.  This is particularly bad when an interface
> >flaps and loses its IP address as the UDP socket's route is
> >then set to nul or loopback or something and never gets fixed.
> >Your nfs mount goes dead even if the routing issues is
> >resolved (interface brought back up).
> >
> >Please see attached patch.
> >
> >Easy way to reproduce problem:
> >
> >mount an nfs filesystem using UDP.
> >ifconfig interface down
> >try to access mount
> >ifconfig interface up
> >mount should still be dead.
> >
> >Please review.
> >
> >-- 
> >- Alfred Perlstein
> >< 
> >nfs_reconnect_udp.diff>_______________________________________________
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> >http://lists.freebsd.org/mailman/listinfo/freebsd-fs
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-- 
- Alfred Perlstein