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LinuxKernel核心中文手册(14)

王朝system·作者佚名  2008-05-19
窄屏简体版  字體: |||超大  

Appendix A (附录 A )

inux Data Structures ( Linux 数据结构)

本附录列出了本书中描述的 Linux 使用的主要的数据结构。为了在页面上访得下,它们经过了少量的编辑。

Block_dev_struct

block_dev_struct 数据结构用于登记可用的块设备,让 buffer cache 使用。它们放在 blk_dev 向量表中。

参见 include/linux/blkdev.h

struct blk_dev_struct {

void (*request_fn)(void);

struct request * current_request;

struct request plug;

struct tq_struct plug_tq;

} ;

buffer_head

buffer_head 数据结构存放 buffer cache 中一个块缓冲区的信息。

参见 include/linux/fs.h

* 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

系统中的每一个网络设备都用一个 device 数据结构表示

参见 include/linux/netdevice.h

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 d

 
 
 
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