MAX_ALLOWED_PINGS
(MAX_ALLOWED_PINGS - 1) * FAST_NFS_PING + fs->fs_pinger - 1;
dlog("%d pings to %s failed - at most %d allowed", np->np_ping, fs->fs_host, MAX_ALLOWED_PINGS);
np->np_ping = MAX_ALLOWED_PINGS; /* immediately down */
np->np_ttl = clocktime() + MAX_ALLOWED_PINGS * FAST_NFS_PING - 1;
#if (FAST_NFS_PING * MAX_ALLOWED_PINGS) >= ALLOWED_MOUNT_TIME