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Annotation of 43BSDReno/sys/ufs/inode.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)inode.h     7.13 (Berkeley) 5/10/90
        !            21:  */
        !            22: 
        !            23: #ifdef KERNEL
        !            24: #include "../ufs/dinode.h"
        !            25: #else
        !            26: #include <ufs/dinode.h>
        !            27: #endif
        !            28: 
        !            29: /*
        !            30:  * The I node is the focus of all file activity in UNIX.
        !            31:  * There is a unique inode allocated for each active file,
        !            32:  * each current directory, each mounted-on file, text file, and the root.
        !            33:  * An inode is 'named' by its dev/inumber pair. (iget/iget.c)
        !            34:  * Data in `struct dinode' is read in from permanent inode on volume.
        !            35:  */
        !            36: 
        !            37: struct inode {
        !            38:        struct  inode *i_chain[2]; /* hash chain, MUST be first */
        !            39:        struct  vnode *i_vnode; /* vnode associated with this inode */
        !            40:        struct  vnode *i_devvp; /* vnode for block I/O */
        !            41:        u_long  i_flag;         /* see below */
        !            42:        dev_t   i_dev;          /* device where inode resides */
        !            43:        ino_t   i_number;       /* i number, 1-to-1 with device address */
        !            44:        struct  fs *i_fs;       /* file sys associated with this inode */
        !            45:        struct  dquot *i_dquot[MAXQUOTAS]; /* pointer to dquot strauctures */
        !            46:        long    i_diroff;       /* offset in dir, where we found last entry */
        !            47:        off_t   i_endoff;       /* end of useful stuff in directory */
        !            48:        long    i_spare0;
        !            49:        long    i_spare1;
        !            50:        struct  dinode i_din;   /* the on-disk inode */
        !            51: };
        !            52: 
        !            53: #define        i_mode          i_din.di_mode
        !            54: #define        i_nlink         i_din.di_nlink
        !            55: #define        i_uid           i_din.di_uid
        !            56: #define        i_gid           i_din.di_gid
        !            57: #if BYTE_ORDER == LITTLE_ENDIAN || defined(tahoe) /* ugh! -- must be fixed */
        !            58: #define        i_size          i_din.di_qsize.val[0]
        !            59: #else /* BYTE_ORDER == BIG_ENDIAN */
        !            60: #define        i_size          i_din.di_qsize.val[1]
        !            61: #endif
        !            62: #define        i_db            i_din.di_db
        !            63: #define        i_ib            i_din.di_ib
        !            64: #define        i_atime         i_din.di_atime
        !            65: #define        i_mtime         i_din.di_mtime
        !            66: #define        i_ctime         i_din.di_ctime
        !            67: #define i_blocks       i_din.di_blocks
        !            68: #define        i_rdev          i_din.di_db[0]
        !            69: #define i_flags                i_din.di_flags
        !            70: #define i_gen          i_din.di_gen
        !            71: #define        i_forw          i_chain[0]
        !            72: #define        i_back          i_chain[1]
        !            73: 
        !            74: /* flags */
        !            75: #define        ILOCKED         0x0001          /* inode is locked */
        !            76: #define        IWANT           0x0002          /* some process waiting on lock */
        !            77: #define        IRENAME         0x0004          /* inode is being renamed */
        !            78: #define        IUPD            0x0010          /* file has been modified */
        !            79: #define        IACC            0x0020          /* inode access time to be updated */
        !            80: #define        ICHG            0x0040          /* inode has been changed */
        !            81: #define        IMOD            0x0080          /* inode has been modified */
        !            82: #define        ISHLOCK         0x0100          /* file has shared lock */
        !            83: #define        IEXLOCK         0x0200          /* file has exclusive lock */
        !            84: #define        ILWAIT          0x0400          /* someone waiting on file lock */
        !            85: 
        !            86: #ifdef KERNEL
        !            87: /*
        !            88:  * Convert between inode pointers and vnode pointers
        !            89:  */
        !            90: #define VTOI(vp)       ((struct inode *)(vp)->v_data)
        !            91: #define ITOV(ip)       ((ip)->i_vnode)
        !            92: 
        !            93: /*
        !            94:  * Convert between vnode types and inode formats
        !            95:  */
        !            96: extern enum vtype      iftovt_tab[];
        !            97: extern int             vttoif_tab[];
        !            98: #define IFTOVT(mode)   (iftovt_tab[((mode) & IFMT) >> 12])
        !            99: #define VTTOIF(indx)   (vttoif_tab[(int)(indx)])
        !           100: 
        !           101: #define MAKEIMODE(indx, mode)  (int)(VTTOIF(indx) | (mode))
        !           102: 
        !           103: u_long nextgennumber;          /* next generation number to assign */
        !           104: 
        !           105: extern ino_t   dirpref();
        !           106: 
        !           107: /*
        !           108:  * Lock and unlock inodes.
        !           109:  */
        !           110: #ifdef notdef
        !           111: #define        ILOCK(ip) { \
        !           112:        while ((ip)->i_flag & ILOCKED) { \
        !           113:                (ip)->i_flag |= IWANT; \
        !           114:                (void) sleep((caddr_t)(ip), PINOD); \
        !           115:        } \
        !           116:        (ip)->i_flag |= ILOCKED; \
        !           117: }
        !           118: 
        !           119: #define        IUNLOCK(ip) { \
        !           120:        (ip)->i_flag &= ~ILOCKED; \
        !           121:        if ((ip)->i_flag&IWANT) { \
        !           122:                (ip)->i_flag &= ~IWANT; \
        !           123:                wakeup((caddr_t)(ip)); \
        !           124:        } \
        !           125: }
        !           126: #else
        !           127: #define ILOCK(ip)      ilock(ip)
        !           128: #define IUNLOCK(ip)    iunlock(ip)
        !           129: #endif
        !           130: 
        !           131: #define        IUPDAT(ip, t1, t2, waitfor) { \
        !           132:        if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) \
        !           133:                (void) iupdat(ip, t1, t2, waitfor); \
        !           134: }
        !           135: 
        !           136: #define        ITIMES(ip, t1, t2) { \
        !           137:        if ((ip)->i_flag&(IUPD|IACC|ICHG)) { \
        !           138:                (ip)->i_flag |= IMOD; \
        !           139:                if ((ip)->i_flag&IACC) \
        !           140:                        (ip)->i_atime = (t1)->tv_sec; \
        !           141:                if ((ip)->i_flag&IUPD) \
        !           142:                        (ip)->i_mtime = (t2)->tv_sec; \
        !           143:                if ((ip)->i_flag&ICHG) \
        !           144:                        (ip)->i_ctime = time.tv_sec; \
        !           145:                (ip)->i_flag &= ~(IACC|IUPD|ICHG); \
        !           146:        } \
        !           147: }
        !           148: 
        !           149: /*
        !           150:  * This overlays the fid sturcture (see mount.h)
        !           151:  */
        !           152: struct ufid {
        !           153:        u_short ufid_len;       /* length of structure */
        !           154:        u_short ufid_pad;       /* force long alignment */
        !           155:        ino_t   ufid_ino;       /* file number (ino) */
        !           156:        long    ufid_gen;       /* generation number */
        !           157: };
        !           158: #endif

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