nfs4_server_vlock
if (nfs4_server_vlock(sp, 1) == FALSE)
if (nfs4_server_vlock(sp, 0) == FALSE) {
if (nfs4_server_vlock(sp, 0) == FALSE) {
if (nfs4_server_vlock(sp, 0) != FALSE) {
extern bool_t nfs4_server_vlock(nfs4_server_t *, int);