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nfsd: add support for upcall version 2
Version 2 upcalls will allow the nfsd to include a hash of the kerberos principal string in the Cld_Create upcall. If a principal is present in the svc_cred, then the hash will be included in the Cld_Create upcall. We attempt to use the svc_cred.cr_raw_principal (which is returned by gssproxy) first, and then fall back to using the svc_cred.cr_principal (which is returned by both gssproxy and rpc.svcgssd). Upon a subsequent restart, the hash will be returned in the Cld_Gracestart downcall and stored in the reclaim_str_hashtbl so it can be used when handling reclaim opens. Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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