Re: NFSv4 uninitialized mtime

[Jeff Layton <jlayton@redhat.com>]

On Thu, 28 Jun 2007 09:19:45 -0400
Trond Myklebust <trond.myklebust@fys.uio.no> wrote:

> On Thu, 2007-06-28 at 08:01 -0400, Jeff Layton wrote:
> > Yes, it looks like Solaris is sending back a zeroed out attrmask on
> > exclusive create. I'm testing against:
> > 
> >                             Solaris Nevada snv_54 X86
> >            Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
> >                         Use is subject to license terms.
> >                            Assembled 04 December 2006
> > 
> > SunOS solaris 5.11 snv_54 i86pc i386 i86pc
> > 
> > My guess is that they're using NFSv3 semantics in their NFSv4 client to
> > set the mtime and atime, and that's why it "works" there. This patchrev
> > is pretty old by now, so they may have already patched this issue. I'll
> > see if I can patch it and test again.
> > 
> > All this, of course, is contingent upon my having interpreted the spec
> > correctly. I think I have, but wouldn't mind if someone sanity checked
> > me on it.
> 
> The only nit I can see is that the server is in theory allowed to store
> the cookie in some writable attribute other than atime/mtime, but I
> can't think of that many that would make sense. Perhaps time_backup and
> time_create for those servers that support them? However since we don't
> care about their values and since they don't support a
> SET_TO_SERVER_TIME4 option, I'm not sure we want to bother...
> 
> Trond
> 
> 

Yes, I didnt see other attrs that made sense either, but if we find any
it shouldn't be too hard to add them in.

In any case, Solaris pretty clearly seems to be using the mtime to
store the verifier but isn't setting the attrmask. I'd like to test a
later solaris rev, but I'm having some issues getting this image
patched.

Stuart, I'd recommend opening a case with Sun and referring them to
this discussion and the RFC. I'm pretty certain this is a server bug.
If Sun mentions this is already fixed, or issues a patch for it, then
please let us know in case others run into this problem.

Thanks,
-- 
Jeff Layton <jlayton@redhat.com>

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