kdev_t rq_dev; int cmd; /* READ or WRITE */ int errors; unsigned long sector; unsigned long nr_sectors; unsigned long current_nr_sectors; char * buffer; struct semaphore * sem; struct buffer_head * bh; struct buffer_head * bhtail; struct request * next; };
rtable 用来描叙向某个IP主机发送包的路由信息。此结构在IP路由cache内部实用。
struct rtable { struct rtable *rt_next; __u32 rt_dst; __u32 rt_src; __u32 rt_gateway; atomic_t rt_refcnt; atomic_t rt_use; unsigned long rt_window; atomic_t rt_lastuse; struct hh_cache *rt_hh; struct device *rt_dev; unsigned short rt_flags; unsigned short rt_mtu; unsigned short rt_irtt; unsigned char rt_tos; };
semaphore 保护临界区数据结构和代码信号灯。
struct semaphore { int count; int waking; int lock ; /* to make waking testing atomic */ struct wait_queue *wait; };
sk_buff 用来描叙在协议层之间交换的网络数据。
struct sk_buff { struct sk_buff *next; /* Next buffer in list */ struct sk_buff *prev; /* Previous buffer in list */ struct sk_buff_head *list; /* List we are on */ int magic_debug_cookie; struct sk_buff *link3; /* Link for IP protocol level buffer chains */ struct sock *sk; /* Socket we are owned by */ unsigned long when; /* used to compute rtt's */
