usr/src/sys/ufs/ufs/dinode.h

/*      dinode.h        4.3     81/02/19        */

/*
 * The I node is the focus of all
 * file activity in unix. There is a unique
 * inode allocated for each active file,
 * each current directory, each mounted-on
 * file, text file, and the root. An inode is 'named'
 * by its dev/inumber pair. (iget/iget.c)
 * Data, from mode on, is read in
 * from permanent inode on volume.
 */

#define NADDR   13

#define NINDEX          6
struct group
{
        short   g_state;
        char    g_index;
        char    g_rot;
        struct  group   *g_group;
        struct  inode   *g_inode;
        struct  file    *g_file;
        short   g_rotmask;
        short   g_datq;
        struct  chan *g_chans[NINDEX];
};
struct  inode
{
        char    i_flag;
        char    i_count;        /* reference count */
        dev_t   i_dev;          /* device where inode resides */
        ino_t   i_number;       /* i number, 1-to-1 with device address */
        unsigned short i_mode;
        short   i_nlink;        /* directory entries */
        short   i_uid;          /* owner */
        short   i_gid;          /* group of owner */
        off_t   i_size;         /* size of file */
        union {
                struct {
                        daddr_t I_addr[NADDR];  /* if normal file/directory */
                        daddr_t I_lastr;        /* last read (for read-ahead) */
                } i_f;
#define i_addr  i_f.I_addr
#define i_lastr i_f.I_lastr
                struct {
                        daddr_t I_rdev;         /* i_addr[0] */
                        struct  group I_group;  /* multiplexor group file */
                } i_d;
#define i_rdev  i_d.I_rdev
#define i_group i_d.I_group
        } i_un;
        short   i_vfdcnt;       /* number of fd's vreading this inode */
        short   i_hlink;        /* link in hash chain (iget/iput/ifind) */
};

#ifdef KERNEL
extern  struct inode inode[];   /* The inode table itself */

struct  inode *rootdir;         /* pointer to inode of root directory */
struct  inode *mpxip;           /* mpx virtual inode */

struct  inode *ialloc();
struct  inode *ifind();
struct  inode *iget();
struct  inode *owner();
struct  inode *maknode();
struct  inode *namei();
#endif

/* flags */
#define ILOCK   01              /* inode is locked */
#define IUPD    02              /* file has been modified */
#define IACC    04              /* inode access time to be updated */
#define IMOUNT  010             /* inode is mounted on */
#define IWANT   020             /* some process waiting on lock */
#define ITEXT   040             /* inode is pure text prototype */
#define ICHG    0100            /* inode has been changed */
#define IPIPE   0200            /* inode is a pipe */

/* modes */
#define IFMT    0170000         /* type of file */
#define         IFDIR   0040000 /* directory */
#define         IFCHR   0020000 /* character special */
#define         IFBLK   0060000 /* block special */
#define         IFREG   0100000 /* regular */
#define         IFMPC   0030000 /* multiplexed char special */
#define         IFMPB   0070000 /* multiplexed block special */
#define ISUID   04000           /* set user id on execution */
#define ISGID   02000           /* set group id on execution */
#define ISVTX   01000           /* save swapped text even after use */
#define IREAD   0400            /* read, write, execute permissions */
#define IWRITE  0200
#define IEXEC   0100