On Tue, 2017-01-24 at 14:15 -0500, J. Bruce Fields wrote:
> On Tue, Jan 24, 2017 at 02:06:16PM -0500, Chuck Lever wrote:
> >
> > > On Jan 23, 2017, at 11:49 AM, bfields@xxxxxxxxxxxx wrote:
> > >
> > > On Mon, Jan 23, 2017 at 10:01:27AM -0500, Chuck Lever wrote:
> > > >
> > > > > On Jan 22, 2017, at 2:04 PM, Chuck Lever <chuck.lever@oracle.
> > > > > com> wrote:
> > > > >
> > > > > Xuan Qi reports that the Linux NFSv4 client failed to lock a
> > > > > file
> > > > > that was migrated. The steps he observed on the wire:
> > > > >
> > > > > 1. The client sent a LOCK request
> > > > > 2. The server replied NFS4ERR_MOVED
> > > > > 3. The client switched to the destination server
> > > > > 4. The client sent the LOCK request again with a bumped
> > > > > lock sequence ID
> > > > > 5. The server rejected the LOCK request with
> > > > > NFS4ERR_BAD_SEQID
> > > >
> > > > The list of steps could be more clear:
> > > >
> > > > 1. The client sent a LOCK request to the source server
> > > > 2. The source server replied NFS4ERR_MOVED
> > > > 3. The client switched to the destination server
> > > > 4. The client sent the same LOCK request to the destination
> > > > server with a bumped lock sequence ID
> > > > 5. The destination server rejected the LOCK request with
> > > > NFS4ERR_BAD_SEQID
> > > >
> > > >
> > > > > RFC 3530 section 8.1.5 provides a list of NFS errors which do
> > > > > not
> > > > > bump a lock sequence ID.
> > > > >
> > > > > However, RFC 3530 is now obsoleted by RFC 7530. In RFC 7530
> > > > > section
> > > > > 9.1.7, this list has been updated by the addition of
> > > > > NFS4ERR_MOVED.
> > >
> > > I guess we figured the backwards-incompatible change was OK since
> > > essentially the Solaris server is the first we know of to be
> > > making real
> > > use of NFS4ERR_MOVED?
> > >
> > > And probably it's required for the their implementation because
> > > the old
> > > server no longer has the ability to update the state once it's
> > > reached
> > > the point of returning ERR_MOVED.
> > >
> > > OK, makes sense to me, I think.
> >
> > Hi Bruce-
> >
> > Does this mean you will take this patch, or should
> > I just add your Reviewed-by: ?
>
> I can take it if nobody objects. Mind if I append the above to the
> changelog? (Just want to document why we think the apparently
> backwards-incompatible change is OK.)
>
I've already added it to my linux-next branch as a stable patch.
--
Trond Myklebust
Linux NFS client maintainer, PrimaryData
trond.myklebust@xxxxxxxxxxxxxxx
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