推荐：Linux操作系统的核心数据结构

block_dev_struct

　　

            　　struct blk_dev_struct {

            　　void (*request_fn)(void);

            　　struct request * current_request;

            　　struct request plug;

            　　struct tq_struct plug_tq;

            　　};

            　　buffer_head

　　

            　　/* bh state bits */

            　　#define BH_Uptodate 0 /* 1 if the buffer contains valid data */

            　　#define BH_Dirty 1 /* 1 if the buffer is dirty */

            　　#define BH_Lock 2 /* 1 if the buffer is locked */

            　　#define BH_Req 3 /* 0 if the buffer has been invalidated */

            　　#define BH_Touched 4 /* 1 if the buffer has been touched (aging) */

            　　#define BH_Has_aged 5 /* 1 if the buffer has been aged (aging) */

            　　#define BH_Protected 6 /* 1 if the buffer is protected */

            　　#define BH_FreeOnIO 7 /* 1 to discard the buffer_head after IO */

            　　struct buffer_head {

            　　/* First cache line: */

            　　unsigned long b_blocknr; /* block number */

            　　kdev_t b_dev; /* device (B_FREE = free) */

            　　kdev_t b_rdev; /* Real device */

            　　unsigned long b_rsector; /* Real buffer location on disk */

            　　struct buffer_head *b_next; /* Hash queue list */

            　　struct buffer_head *b_this_page; /* circular list of buffers in one

            　　page */

            　　/* Second cache line: */

            　　unsigned long b_state; /* buffer state bitmap (above) */

            　　struct buffer_head *b_next_free;

            　　unsigned int b_count; /* users using this block */

            　　unsigned long b_size; /* block size */

            　　/* Non-performance-critical data follows. */

            　　char *b_data; /* pointer to data block */

            　　unsigned int b_list; /* List that this buffer appears */

            　　unsigned long b_flushtime; /* Time when this (dirty) buffer

            　　* should be written */

            　　unsigned long b_lru_time; /* Time when this buffer was

            　　* last used. */

            　　struct wait_queue *b_wait;

            　　struct buffer_head *b_prev; /* doubly linked hash list */

            　　struct buffer_head *b_prev_free; /* doubly linked list of buffers */

            　　struct buffer_head *b_reqnext; /* request queue */

            　　};

            　　device

　

            　　struct device

            　　{

            　　/*

            　　* This is the first field of the "visible" part of this structure

            　　* (i.e. as seen by users in the "Space.c" file). It is the name

            　　* the interface.

            　　*/

            　　char *name;

            　　/* I/O specific fields */

            　　unsigned long rmem_end; /* shmem "recv" end */

            　　unsigned long rmem_start; /* shmem "recv" start */

            　　unsigned long mem_end; /* shared mem end */

            　　unsigned long mem_start; /* shared mem start */

            　　unsigned long base_addr; /* device I/O address */

            　　unsigned char irq; /* device IRQ number */

            　　/* Low-level status flags. */

            　　volatile unsigned char start, /* start an operation */

            　　interrupt; /* interrupt arrived */

            　　unsigned long tbusy; /* transmitter busy */

            　　struct device *next;

            　　/* The device initialization function. Called only once. */

            　　int (*init)(struct device *dev);

            　　/* Some hardware also needs these fields, but they are not part of

            　　the usual set specified in Space.c. */

            　　unsigned char if_port; /* Selectable AUI,TP, */

            　　unsigned char dma; /* DMA channel */

            　　struct enet_statistics* (*get_stats)(struct device *dev);

            　　/*

            　　* This marks the end of the "visible" part of the structure. All

            　　* fields hereafter are internal to the system, and may change at

            　　* will (read: may be cleaned up at will).

            　　*/

            　　/* These may be needed for future network-power-down code. */

            　　unsigned long trans_start; /* Time (jiffies) of last transmit */

            　　unsigned long last_rx; /* Time of last Rx */

            　　unsigned short flags; /* interface flags (BSD)*/

            　　unsigned short family; /* address family ID */

            　　unsigned short metric; /* routing metric */

            　　unsigned short mtu; /* MTU value */

            　　unsigned short type; /* hardware type */

            　　unsigned short hard_header_len; /* hardware hdr len */

            　　void *priv; /* private data */

            　　/* Interface address info. */

            　　unsigned char broadcast[MAX_ADDR_LEN];

            　　unsigned char pad;

            　　unsigned char dev_addr[MAX_ADDR_LEN];

            　　unsigned char addr_len; /* hardware addr len */

            　　unsigned long pa_addr; /* protocol address */

            　　unsigned long pa_brdaddr; /* protocol broadcast addr*/

            　　unsigned long pa_dstaddr; /* protocol P-P other addr*/

            　　unsigned long pa_mask; /* protocol netmask */

            　　unsigned short pa_alen; /* protocol address len */

            　　struct dev_mc_list *mc_list; /* M'cast mac addrs */

            　　int mc_count; /* No installed mcasts */

            　　struct ip_mc_list *ip_mc_list; /* IP m'cast filter chain */

            　　__u32 tx_queue_len; /* Max frames per queue */

            　　/* For load balancing driver pair support */

            　　unsigned long pkt_queue; /* Packets queued */

            　　struct device *slave; /* Slave device */

            　　struct net_alias_info *alias_info; /* main dev alias info */

            　　struct net_alias *my_alias; /* alias devs */

            　　/* Pointer to the interface buffers. */

            　　struct sk_buff_head buffs[DEV_NUMBUFFS];

            　　/* Pointers to interface service routines. */

            　　int (*open)(struct device *dev);

            　　int (*stop)(struct device *dev);

            　　int (*hard_start_xmit) (struct sk_buff *skb,

            　　struct device *dev);

            　　int (*hard_header) (struct sk_buff *skb,

            　　struct device *dev,

            　　unsigned short type,

            　　void *daddr,

            　　void *saddr,

            　　unsigned len);

            　　int (*rebuild_header)(void *eth,

            　　struct device *dev,

            　　unsigned long raddr,

            　　struct sk_buff *skb);

            　　void (*set_multicast_list)(struct device *dev);

            　　int (*set_mac_address)(struct device *dev,

            　　void *addr);

            　　int (*do_ioctl)(struct device *dev,

            　　struct ifreq *ifr,

            　　int cmd);

            　　int (*set_config)(struct device *dev,

            　　struct ifmap *map);

            　　void (*header_cache_bind)(struct hh_cache **hhp,

            　　struct device *dev,

            　　unsigned short htype,

            　　__u32 daddr);

            　　void (*header_cache_update)(struct hh_cache *hh,

            　　struct device *dev,

            　　unsigned char * haddr);

            　　int (*change_mtu)(struct device *dev,

            　　int new_mtu);

            　　struct iw_statistics* (*get_wireless_stats)(struct device *dev);

            　　};

            　　device_struct