Date: Fri, 9 Sep 2011 08:28:32 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Rick Macklem <rmacklem@uoguelph.ca> Subject: Re: NFS server File Handle changing upon reboot Message-ID: <201109090828.32536.jhb@freebsd.org> In-Reply-To: <2047531658.973519.1315489517809.JavaMail.root@erie.cs.uoguelph.ca> References: <2047531658.973519.1315489517809.JavaMail.root@erie.cs.uoguelph.ca>
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On Thursday, September 08, 2011 9:45:17 am Rick Macklem wrote: > Hiroki Sato spotted a problem with NFS server file handles (FHs) > changing after a server upgrade, because the exported file > system type(s) get configured in a different order and, therefore, > assigned different vfs_typenum values. > > A patch has been worked out, after discussion with various folks, > that uses a hash function to assign the vfs_typenum values. > > This fixes the problem, except it has one downside: > - The first server boot after the patch has been applied will > result in FHs changing and, as such, NFS clients > will need to remount after this upgrade. > > So, finally to why I am posting, which is to ask for opinions > on what should be done with this patch? > 1 - Ask re@ for permission to commit this to -current for 9.0, > so that the FH change happens at the 8.X->9.0 upgrade. > (It does seem that if some variant of this should go in, then > a major release seems like the correct time to do it?) > 2 - Add a loader.conf variable to the patch, which would allow > a sysadmin to "flip the switch" when it is convenient for > them. (I do have a concern that this might just cause more > confusion w.r.t. when/what needs to be done.) > 3 - Do #2, for 8.X and make the patch the default for 9.0. > 4 - Forget the patch and leave things the way the are now. Well, I would do 3a: Generate the patch in 2 and merge it to 8, but in 8 have the default be the existing behavior. In 10 you can remove the switch altogether. -- John Baldwin
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