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

/*      dinode.h        4.10    82/02/27        */

/*
 * 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

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 */
/* begin read from disk */
        u_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 i_f {
                        daddr_t if_addr[NADDR]; /* if normal file/directory */
                        daddr_t if_lastr;       /* last read (read-ahead) */
                } i_f;
                struct i_d {
                        daddr_t id_rdev;        /* i_addr[0] */
                } i_d;
                struct i_s {
                        struct  socket *is_socket;
                } i_s;
#define i_addr          i_f.if_addr
#define i_lastr         i_f.if_lastr
#define i_rdev          i_d.id_rdev
#define i_socket        i_s.is_socket
        } i_un;
/* end read from disk */
        short   i_XXXXXX;       /* ### */
/* SHOULD USE POINTERS, NOT INDICES, FOR HAS CHAIN */
        short   i_hlink;        /* link in hash chain (iget/iput/ifind) */
};

#ifdef KERNEL
struct  inode *inode, *inodeNINODE;
int     ninode;

struct  inode *rootdir;         /* pointer to inode of root directory */

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 */

/* modes */
#define IFMT    0170000         /* type of file */
#define         IFCHR           0020000         /* character special */
#define         IFDIR           0040000         /* directory */
#define         IFBLK           0060000         /* block special */
#define         IFREG           0100000         /* regular */
#define         IFLNK           0120000         /* symbolic link */
#define         IFPORTAL        0140000         /* portal */
#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