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

/*      dinode.h        4.14    82/08/10        */

/*
 * 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 in icommon is read in from permanent inode on volume.
 */

#define NDADDR  8               /* direct addresses in inode */
#define NIADDR  2               /* indirect addresses in inode */

struct inode {
        struct  inode *i_chain[2];      /* must be first */
        u_short i_flag;
        u_short i_count;        /* reference count */
        dev_t   i_dev;          /* device where inode resides */
        u_short i_rdlockc;      /* count of locked readers on inode */
        u_short i_wrlockc;      /* count of locked writers on inode */
        ino_t   i_number;       /* i number, 1-to-1 with device address */
        struct  fs *i_fs;       /* file sys associated with this inode */
        struct  dquot *i_dquot; /* quota structure controlling this file */
        union {
                daddr_t if_lastr;       /* last read (read-ahead) */
                struct  socket *is_socket;
                struct  {
                        struct inode  *if_freef;        /* free list forward */
                        struct inode **if_freeb;        /* free list back */
                } i_fr;
        } i_un;
        struct  icommon
        {
                u_short ic_mode;        /*  0: mode and type of file */
                short   ic_nlink;       /*  2: number of links to file */
                short   ic_uid;         /*  4: owner's user id */
                short   ic_gid;         /*  6: owner's group id */
                off_t   ic_size;        /*  8: number of bytes in file */
                daddr_t ic_db[NDADDR];  /* 12: disk block addresses */
                daddr_t ic_ib[NIADDR];  /* 44: indirect blocks */
                time_t  ic_atime;       /* 52: time last accessed */
                time_t  ic_mtime;       /* 56: time last modified */
                time_t  ic_ctime;       /* 60: time created */
        } i_ic;
};

struct dinode {
        union {
                struct  icommon di_icom;
                char    di_size[64];
        } di_un;
};

#define i_mode          i_ic.ic_mode
#define i_nlink         i_ic.ic_nlink
#define i_uid           i_ic.ic_uid
#define i_gid           i_ic.ic_gid
#define i_size          i_ic.ic_size
#define i_db            i_ic.ic_db
#define i_ib            i_ic.ic_ib
#define i_atime         i_ic.ic_atime
#define i_mtime         i_ic.ic_mtime
#define i_ctime         i_ic.ic_ctime
#define i_rdev          i_ic.ic_db[0]
#define i_lastr         i_un.if_lastr
#define i_socket        is_socket
#define i_forw          i_chain[0]
#define i_back          i_chain[1]
#define i_freef         i_un.i_fr.if_freef
#define i_freeb         i_un.i_fr.if_freeb

#define di_ic           di_un.di_icom
#define di_mode         di_ic.ic_mode
#define di_nlink        di_ic.ic_nlink
#define di_uid          di_ic.ic_uid
#define di_gid          di_ic.ic_gid
#define di_size         di_ic.ic_size
#define di_db           di_ic.ic_db
#define di_ib           di_ic.ic_ib
#define di_atime        di_ic.ic_atime
#define di_mtime        di_ic.ic_mtime
#define di_ctime        di_ic.ic_ctime
#define di_rdev         di_ic.ic_db[0]

#ifdef KERNEL
extern  struct inode *inode;            /* The inode table itself */
extern  struct inode *inodeNINODE;      /* The end of the inode table */
extern  int ninode;                     /* number of slots in the table */

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           0x1             /* inode is locked */
#define IUPD            0x2             /* file has been modified */
#define IACC            0x4             /* inode access time to be updated */
#define IMOUNT          0x8             /* inode is mounted on */
#define IWANT           0x10            /* some process waiting on lock */
#define ITEXT           0x20            /* inode is pure text prototype */
#define ICHG            0x40            /* inode has been changed */
#define IRDLOCK         0x80            /* file is read locked */
#define IWRLOCK         0x100           /* file is write locked */
#define ILWAIT          0x200           /* someone waiting on file lock */

/* 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