[Bug 274574] The NFSv4.1/4.2 server misparses the Open Claim_Deleg_Cur_FH option

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274574

            Bug ID: 274574
           Summary: The NFSv4.1/4.2 server misparses the Open
                    Claim_Deleg_Cur_FH option
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rmacklem@FreeBSD.org

Created attachment 245723
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=245723&action=edit
Fix handling of the Open Claim_Deleg_Cur_FH option

If delegations are enabled (vfs.nfsd.issue_delegations==1, not by
default), a non-FreeBSD NFSv4.1/4.2 client mount might perform
an Open with the Claim_Deleg_Cur_FH option.  This will not work
unless the attached patch is applied to the FreeBSD NFSv4.1/4.2 server.

Note that this does not affect a FreeBSD NFSv4.1/4.2 mount, but
may affect mounts from non-FreeBSD clients.

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