size_t             64 include/sys/device.h typedef int (*devop_read_t)   (device_t, char *, size_t *, int);
size_t             65 include/sys/device.h typedef int (*devop_write_t)  (device_t, char *, size_t *, int);
size_t            126 include/sys/vnode.h typedef	int (*vnop_read_t)	(vnode_t, file_t, void *, size_t, size_t *);
size_t            127 include/sys/vnode.h typedef	int (*vnop_write_t)	(vnode_t, file_t, void *, size_t, size_t *);