nfsd4: better reservation of head space for krb5

RPC_MAX_AUTH_SIZE is scattered around several places.  Better to set it
once in the auth code, where this kind of estimate should be made.  And
while we're at it we can leave it zero when we're not using krb5i or
krb5p.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 85cb6472a423..1bc7cd05b22e 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -260,7 +260,10 @@ struct svc_rqst {
         void *                  rq_argp;        /* decoded arguments */
         void *                  rq_resp;        /* xdr'd results */
         void *                  rq_auth_data;   /* flavor-specific data */
-
+        int                     rq_auth_slack;  /* extra space xdr code
+                                                 * should leave in head
+                                                 * for krb5i, krb5p.
+                                                 */
         int                     rq_reserved;    /* space on socket outq
                                                  * reserved for this request
                                                  */
@@ -456,11 +459,7 @@ char *		   svc_print_addr(struct svc_rqst *, char *, size_t);
  */
 static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
 {
-        int added_space = 0;
-
-        if (rqstp->rq_authop->flavour)
-                added_space = RPC_MAX_AUTH_SIZE;
-        svc_reserve(rqstp, space + added_space);
+        svc_reserve(rqstp, space + rqstp->rq_auth_slack);
 }
 
 #endif /* SUNRPC_SVC_H */