1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 35fa4d5aadd0..4a7ae8ab6eb8 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -396,4 +396,23 @@ char *		   svc_print_addr(struct svc_rqst *, char *, size_t);
 
 #define RPC_MAX_ADDRBUFLEN      (63U)
 
+/*
+ * When we want to reduce the size of the reserved space in the response
+ * buffer, we need to take into account the size of any checksum data that
+ * may be at the end of the packet. This is difficult to determine exactly
+ * for all cases without actually generating the checksum, so we just use a
+ * static value.
+ */
+static inline void
+svc_reserve_auth(struct svc_rqst *rqstp, int space)
+{
+        int                     added_space = 0;
+
+        switch(rqstp->rq_authop->flavour) {
+                case RPC_AUTH_GSS:
+                        added_space = RPC_MAX_AUTH_SIZE;
+        }
+        return svc_reserve(rqstp, space + added_space);
+}
+
 #endif /* SUNRPC_SVC_H */