linux

linux informations

        struct iso_inode_info    isofs_i;
        struct nfs_inode_info    nfs_i;
        struct xiafs_inode_info  xiafs_i;
        struct sysv_inode_info   sysv_i;
        struct affs_inode_info   affs_i;
        struct ufs_inode_info    ufs_i;
        struct socket            socket_i;
        void                     *generic_ip;
    } u;
};
ipc_perm
此结构描叙对一个系统V IPC对象的存取权限。 

struct ipc_perm
{
  key_t  key;
  ushort uid;   /* owner euid and egid */
  ushort gid;
  ushort cuid;  /* creator euid and egid */
  ushort cgid;
  ushort mode;  /* access modes see mode flags below */
  ushort seq;   /* sequence number */
};
irqaction
用来描叙系统的中断处理过程。 

struct irqaction {
  void (*handler)(int, void *, struct pt_regs *);
  unsigned long flags;
  unsigned long mask;
  const char *name;
  void *dev_id;
  struct irqaction *next;
};
linux_binfmt
用来表示可被Linux理解的二进制文件格式。 

struct linux_binfmt {
  struct linux_binfmt * next;
  long *use_count;
  int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  int (*load_shlib)(int fd);
  int (*core_dump)(long signr, struct pt_regs * regs);
};
mem_map_t
用来保存每个物理页面的信息。 

typedef struct page {
  /* these must be first (free area handling) */
  struct page        *next;
  struct page        *prev;
  struct inode       *inode;
  unsigned long      offset;
  struct page        *next_hash;
  atomic_t           count;
  unsigned           flags;     /* atomic flags, some possibly 
                                   updated asynchronously */
  unsigned           dirty:16,
                     age:8;
  struct wait_queue  *wait;
  struct page        *prev_hash;
  struct buffer_head *buffers;
  unsigned long      swap_unlock_entry;
  unsigned long      map_nr;    /* page->map_nr == page - mem_map */
} mem_map_t;
mm_struct
用来描叙某任务或进程的虚拟内存。 

struct mm_struct {
  int count;
  pgd_t * pgd;
  unsigned long context;
  unsigned long start_code, end_code, start_data, end_data;
  unsigned long start_brk, brk, start_stack, start_mmap;
  unsigned long arg_start, arg_end, env_start, env_end;
  unsigned long rss, total_vm, locked_vm;
  unsigned long def_flags;
  struct vm_area_struct * mmap;
  struct vm_area_struct * mmap_avl;
  struct semaphore mmap_sem;
};
pci_bus
表示系统中的一个PCI总线。 

struct pci_bus {
  struct pci_bus  *parent;     /* parent bus this bridge is on */
  struct pci_bus  *children;   /* chain of P2P bridges on this bus */
  struct pci_bus  *next;       /* chain of all PCI buses */

  struct pci_dev  *self;       /* bridge device as seen by parent */
  struct pci_dev  *devices;    /* devices behind this bridge */

  void    *sysdata;            /* hook for sys-specific extension */

  unsigned char  number;       /* bus number */
  unsigned char  primary;      /* number of primary bridge */
  unsigned char  secondary;    /* number of secondary bridge */
  unsigned char  subordinate;  /* max number of subordinate buses */
};
pci_dev
表示系统中的每个PCI设备，包括PCI-PCI和PCI-PCI桥接器。 

/*
 * There is one pci_dev structure for each slot-number/function-number
 * combination:
 */
struct pci_dev {
  struct pci_bus  *bus;      /* bus this device is on */
  struct pci_dev  *sibling;  /* next device on this bus */
  struct pci_dev  *next;     /* chain of all devices */

  void    *sysdata;          /* hook for sys-specific extension */

  unsigned int  devfn;       /* encoded device & function index */
  unsigned short  vendor;
  unsigned short  device;
  unsigned int  class;       /* 3 bytes: (base,sub,prog-if) */
  unsigned int  master : 1;  /* set if device is master capable */
  /*
   * In theory, the irq level can be read from configuration
   * space and all would be fine.  However, old PCI chips don't
   * support these registers and return 0 instead.  For example,
   * the Vision864-P rev 0 chip can uses INTA, but returns 0 in
   * the interrupt line and pin registers.  pci_init()
   * initializes this field with the value at PCI_INTERRUPT_LINE
   * and it is the job of pcibios_fixup() to change it if
   * necessary.  The field must not be 0 unless the device
   * cannot generate interrupts at all.
   */
  unsigned char  irq;        /* irq generated by this device */
};
request
被用来向系统的块设备发送请求。它总是向buffer cache读出或写入数据块。 

struct request {
    volatile int rq_status;    
#define RQ_INACTIVE            (-1)
#define RQ_ACTIVE              1
#define RQ_SCSI_BUSY           0xffff
#define RQ_SCSI_DONE           0xfffe
#define RQ_SCSI_DISCONNECTING  0xffe0

    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                 */
  struct timeval      stamp;       /* Time we arrived                       */
  struct device       *dev;        /* Device we arrived on/are leaving by   */
  union 
  {
      struct tcphdr   *th;
      struct ethhdr   *eth;
      struct iphdr    *iph;
      struct udphdr   *uh;
      unsigned char   *raw;
      /* for passing file handles in a unix domain socket */
      void            *filp;
  } h;
  
  union 
  {    
      /* As yet incomplete physical layer views */
      unsigned char   *raw;
      struct ethhdr   *ethernet;
  } mac;
  
  struct iphdr        *ip_hdr;     /* For IPPROTO_RAW                       */
  unsigned long       len;         /* Length of actual data                 */
  unsigned long       csum;        /* Checksum                              */
  __u32               saddr;       /* IP source address                     */
  __u32               daddr;       /* IP target address                     */
  __u32               raddr;       /* IP next hop address                   */
  __u32               seq;         /* TCP sequence number                   */
  __u32               end_seq;     /* seq [+ fin] [+ syn] + datalen         */
  __u32               ack_seq;     /* TCP ack sequence number               */
  unsigned char       proto_priv[16];
  volatile char       acked,       /* Are we acked ?                        */
                      used,        /* Are we in use ?                       */
                      free,        /* How to free this buffer               */
                      arp;         /* Has IP/ARP resolution finished        */
  unsigned char       tries,       /* Times tried                           */
                      lock,        /* Are we locked ?                       */
                      localroute,  /* Local routing asserted for this frame */
                      pkt_type,    /* Packet class                          */
                      pkt_bridged, /* Tracker for bridging                  */
                      ip_summed;   /* Driver fed us an IP checksum          */
#define PACKET_HOST         0        /* To us                                 */
#define PACKET_BROADCAST    1        /* To all                                */
#define PACKET_MULTICAST    2        /* To group                              */
#define PACKET_OTHERHOST    3        /* To someone else                       */
  unsigned short      users;       /* User count - see datagram.c,tcp.c     */
  unsigned short      protocol;    /* Packet protocol from driver.          */
  unsigned int        truesize;    /* Buffer size                           */
  atomic_t            count;       /* reference count                       */
  struct sk_buff      *data_skb;   /* Link to the actual data skb           */
  unsigned char       *head;       /* Head of buffer                        */
  unsigned char       *data;       /* Data head pointer                     */
  unsigned char       *tail;       /* Tail pointer                          */
  unsigned char       *end;        /* End pointer                           */
  void                (*destructor)(struct sk_buff *); /* Destruct function */
  __u16               redirport;   /* Redirect port                         */
};
sock
包含BSD套接口的协议相关信息。例如对于一个INET（Internet Address Domain）套接口此数据结构 包含TCP/IP和UDP/IP信息。 

struct sock 
{
    /* This must be first. */
    struct sock             *sklist_next;
    struct sock             *sklist_prev;

    struct options          *opt;
    atomic_t                wmem_alloc;
    atomic_t                rmem_alloc;
    unsigned long           allocation;       /* Allocation mode */
    __u32                   write_seq;
    __u32                   sent_seq;
    __u32                   acked_seq;
    __u32                   copied_seq;
    __u32                   rcv_ack_seq;
    unsigned short          rcv_ack_cnt;      /* count of same ack */
    __u32                   window_seq;
    __u32                   fin_seq;
    __u32                   urg_seq;
    __u32                   urg_data;
    __u32                   syn_seq;
    int                     users;            /* user count */
  /*
   *    Not all are volatile, but some are, so we
   *     might as well say they all are.
   */
    volatile char           dead,
                            urginline,
                            intr,
                            blog,
                            done,
                            reuse,
                            keepopen,
                            linger,
                            delay_acks,