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