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

/*      dinode.h        6.5     84/07/26        */

/*
 * 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  12              /* direct addresses in inode */
#define NIADDR  3               /* 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_shlockc;      /* count of shared locks on inode */
        u_short i_exlockc;      /* count of exclusive locks on inode */
        ino_t   i_number;       /* i number, 1-to-1 with device address */
        long    i_id;           /* unique identifier */
        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 */
                quad    ic_size;        /*  8: number of bytes in file */
                time_t  ic_atime;       /* 16: time last accessed */
                long    ic_atspare;
                time_t  ic_mtime;       /* 24: time last modified */
                long    ic_mtspare;
                time_t  ic_ctime;       /* 32: last time inode changed */
                long    ic_ctspare;
                daddr_t ic_db[NDADDR];  /* 40: disk block addresses */
                daddr_t ic_ib[NIADDR];  /* 88: indirect blocks */
                long    ic_flags;       /* 100: status, currently unused */
                long    ic_blocks;      /* 104: blocks actually held */
                long    ic_spare[5];    /* 108: reserved, currently unused */
        } i_ic;
};

struct dinode {
        union {
                struct  icommon di_icom;
                char    di_size[128];
        } 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
/* ugh! -- must be fixed */
#ifdef vax
#define i_size          i_ic.ic_size.val[0]
#endif
#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_blocks        i_ic.ic_blocks
#define i_rdev          i_ic.ic_db[0]
#define i_lastr         i_un.if_lastr
#define i_socket        i_un.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
#ifdef vax
#define di_size         di_ic.ic_size.val[0]
#endif
#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]
#define di_blocks       di_ic.ic_blocks

#ifdef KERNEL
/*
 * Invalidate an inode. Used by the namei cache to detect stale
 * information. At an absurd rate of 100 calls/second, the inode
 * table invalidation should only occur once every 16 months.
 */
#define cacheinval(ip)  \
{ \
        struct inode *xp; \
        (ip)->i_id = ++nextinodeid; \
        if (nextinodeid == 0) \
                for (nextinodeid = 0, xp = inode; xp < inodeNINODE; xp++) \
                        xp->i_id = 0; \
}

struct inode *inode;            /* the inode table itself */
struct inode *inodeNINODE;      /* the end of the inode table */
int     ninode;                 /* number of slots in the table */
long    nextinodeid;            /* unique id generator */

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

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

ino_t   dirpref();
#endif

/* flags */
#define ILOCKED         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 ISHLOCK         0x80            /* file has shared lock */
#define IEXLOCK         0x100           /* file has exclusive lock */
#define ILWAIT          0x200           /* someone waiting on file lock */
#define IMOD            0x400           /* inode has been modified */
#define IRENAME         0x800           /* inode is being renamed */

/* 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 IFSOCK          0140000         /* socket */

#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

#define ILOCK(ip) { \
        while ((ip)->i_flag & ILOCKED) { \
                (ip)->i_flag |= IWANT; \
                sleep((caddr_t)(ip), PINOD); \
        } \
        (ip)->i_flag |= ILOCKED; \
}

#define IUNLOCK(ip) { \
        (ip)->i_flag &= ~ILOCKED; \
        if ((ip)->i_flag&IWANT) { \
                (ip)->i_flag &= ~IWANT; \
                wakeup((caddr_t)(ip)); \
        } \
}

#define IUPDAT(ip, t1, t2, waitfor) { \
        if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) \
                iupdat(ip, t1, t2, waitfor); \
}

#define ITIMES(ip, t1, t2) { \
        if ((ip)->i_flag&(IUPD|IACC|ICHG)) { \
                (ip)->i_flag |= IMOD; \
                if ((ip)->i_flag&IACC) \
                        (ip)->i_atime = (t1)->tv_sec; \
                if ((ip)->i_flag&IUPD) \
                        (ip)->i_mtime = (t2)->tv_sec; \
                if ((ip)->i_flag&ICHG) \
                        (ip)->i_ctime = time.tv_sec; \
                (ip)->i_flag &= ~(IACC|IUPD|ICHG); \
        } \
}