AUTOFS_DEV_IOCTL_VERSION_CMD
(AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD - AUTOFS_DEV_IOCTL_VERSION_CMD)
if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
AUTOFS_DEV_IOCTL_VERSION_CMD, struct autofs_dev_ioctl)