4.3BSD - /usr/src/sys/h/inode.h

   1: /*
   2:  * Copyright (c) 1982, 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)inode.h	7.1 (Berkeley) 6/4/86
   7:  */
   8: 
   9: /*
  10:  * The I node is the focus of all file activity in UNIX.
  11:  * There is a unique inode allocated for each active file,
  12:  * each current directory, each mounted-on file, text file, and the root.
  13:  * An inode is 'named' by its dev/inumber pair. (iget/iget.c)
  14:  * Data in icommon is read in from permanent inode on volume.
  15:  */
  16: 
  17: #define NDADDR  12      /* direct addresses in inode */
  18: #define NIADDR  3       /* indirect addresses in inode */
  19: 
  20: struct inode {
  21:     struct  inode *i_chain[2];  /* must be first */
  22:     u_short i_flag;
  23:     u_short i_count;    /* reference count */
  24:     dev_t   i_dev;      /* device where inode resides */
  25:     u_short i_shlockc;  /* count of shared locks on inode */
  26:     u_short i_exlockc;  /* count of exclusive locks on inode */
  27:     ino_t   i_number;   /* i number, 1-to-1 with device address */
  28:     long    i_id;       /* unique identifier */
  29:     struct  fs *i_fs;   /* file sys associated with this inode */
  30:     struct  dquot *i_dquot; /* quota structure controlling this file */
  31:     struct  text *i_text;   /* text entry, if any (should be region) */
  32:     union {
  33:         daddr_t if_lastr;   /* last read (read-ahead) */
  34:         struct  socket *is_socket;
  35:         struct  {
  36:             struct inode  *if_freef;    /* free list forward */
  37:             struct inode **if_freeb;    /* free list back */
  38:         } i_fr;
  39:     } i_un;
  40:     struct  icommon
  41:     {
  42:         u_short ic_mode;    /*  0: mode and type of file */
  43:         short   ic_nlink;   /*  2: number of links to file */
  44:         uid_t   ic_uid;     /*  4: owner's user id */
  45:         gid_t   ic_gid;     /*  6: owner's group id */
  46:         quad    ic_size;    /*  8: number of bytes in file */
  47:         time_t  ic_atime;   /* 16: time last accessed */
  48:         long    ic_atspare;
  49:         time_t  ic_mtime;   /* 24: time last modified */
  50:         long    ic_mtspare;
  51:         time_t  ic_ctime;   /* 32: last time inode changed */
  52:         long    ic_ctspare;
  53:         daddr_t ic_db[NDADDR];  /* 40: disk block addresses */
  54:         daddr_t ic_ib[NIADDR];  /* 88: indirect blocks */
  55:         long    ic_flags;   /* 100: status, currently unused */
  56:         long    ic_blocks;  /* 104: blocks actually held */
  57:         long    ic_spare[5];    /* 108: reserved, currently unused */
  58:     } i_ic;
  59: };
  60: 
  61: struct dinode {
  62:     union {
  63:         struct  icommon di_icom;
  64:         char    di_size[128];
  65:     } di_un;
  66: };
  67: 
  68: #define i_mode      i_ic.ic_mode
  69: #define i_nlink     i_ic.ic_nlink
  70: #define i_uid       i_ic.ic_uid
  71: #define i_gid       i_ic.ic_gid
  72: /* ugh! -- must be fixed */
  73: #ifdef vax
  74: #define i_size      i_ic.ic_size.val[0]
  75: #endif
  76: #define i_db        i_ic.ic_db
  77: #define i_ib        i_ic.ic_ib
  78: #define i_atime     i_ic.ic_atime
  79: #define i_mtime     i_ic.ic_mtime
  80: #define i_ctime     i_ic.ic_ctime
  81: #define i_blocks    i_ic.ic_blocks
  82: #define i_rdev      i_ic.ic_db[0]
  83: #define i_lastr     i_un.if_lastr
  84: #define i_socket    i_un.is_socket
  85: #define i_forw      i_chain[0]
  86: #define i_back      i_chain[1]
  87: #define i_freef     i_un.i_fr.if_freef
  88: #define i_freeb     i_un.i_fr.if_freeb
  89: 
  90: #define di_ic       di_un.di_icom
  91: #define di_mode     di_ic.ic_mode
  92: #define di_nlink    di_ic.ic_nlink
  93: #define di_uid      di_ic.ic_uid
  94: #define di_gid      di_ic.ic_gid
  95: #ifdef vax
  96: #define di_size     di_ic.ic_size.val[0]
  97: #endif
  98: #define di_db       di_ic.ic_db
  99: #define di_ib       di_ic.ic_ib
 100: #define di_atime    di_ic.ic_atime
 101: #define di_mtime    di_ic.ic_mtime
 102: #define di_ctime    di_ic.ic_ctime
 103: #define di_rdev     di_ic.ic_db[0]
 104: #define di_blocks   di_ic.ic_blocks
 105: 
 106: #ifdef KERNEL
 107: /*
 108:  * Invalidate an inode. Used by the namei cache to detect stale
 109:  * information. At an absurd rate of 100 calls/second, the inode
 110:  * table invalidation should only occur once every 16 months.
 111:  */
 112: #define cacheinval(ip)  \
 113:     (ip)->i_id = ++nextinodeid; \
 114:     if (nextinodeid == 0) \
 115:         cacheinvalall();
 116: 
 117: struct inode *inode;        /* the inode table itself */
 118: struct inode *inodeNINODE;  /* the end of the inode table */
 119: int ninode;         /* number of slots in the table */
 120: long    nextinodeid;        /* unique id generator */
 121: 
 122: struct  inode *rootdir;         /* pointer to inode of root directory */
 123: 
 124: struct  inode *ialloc();
 125: struct  inode *iget();
 126: #ifdef notdef
 127: struct  inode *ifind();
 128: #endif
 129: struct  inode *owner();
 130: struct  inode *maknode();
 131: struct  inode *namei();
 132: 
 133: ino_t   dirpref();
 134: #endif
 135: 
 136: /* flags */
 137: #define ILOCKED     0x1     /* inode is locked */
 138: #define IUPD        0x2     /* file has been modified */
 139: #define IACC        0x4     /* inode access time to be updated */
 140: #define IMOUNT      0x8     /* inode is mounted on */
 141: #define IWANT       0x10        /* some process waiting on lock */
 142: #define ITEXT       0x20        /* inode is pure text prototype */
 143: #define ICHG        0x40        /* inode has been changed */
 144: #define ISHLOCK     0x80        /* file has shared lock */
 145: #define IEXLOCK     0x100       /* file has exclusive lock */
 146: #define ILWAIT      0x200       /* someone waiting on file lock */
 147: #define IMOD        0x400       /* inode has been modified */
 148: #define IRENAME     0x800       /* inode is being renamed */
 149: 
 150: /* modes */
 151: #define IFMT        0170000     /* type of file */
 152: #define IFCHR       0020000     /* character special */
 153: #define IFDIR       0040000     /* directory */
 154: #define IFBLK       0060000     /* block special */
 155: #define IFREG       0100000     /* regular */
 156: #define IFLNK       0120000     /* symbolic link */
 157: #define IFSOCK      0140000     /* socket */
 158: 
 159: #define ISUID       04000       /* set user id on execution */
 160: #define ISGID       02000       /* set group id on execution */
 161: #define ISVTX       01000       /* save swapped text even after use */
 162: #define IREAD       0400        /* read, write, execute permissions */
 163: #define IWRITE      0200
 164: #define IEXEC       0100
 165: 
 166: #define ILOCK(ip) { \
 167:     while ((ip)->i_flag & ILOCKED) { \
 168:         (ip)->i_flag |= IWANT; \
 169:         sleep((caddr_t)(ip), PINOD); \
 170:     } \
 171:     (ip)->i_flag |= ILOCKED; \
 172: }
 173: 
 174: #define IUNLOCK(ip) { \
 175:     (ip)->i_flag &= ~ILOCKED; \
 176:     if ((ip)->i_flag&IWANT) { \
 177:         (ip)->i_flag &= ~IWANT; \
 178:         wakeup((caddr_t)(ip)); \
 179:     } \
 180: }
 181: 
 182: #define IUPDAT(ip, t1, t2, waitfor) { \
 183:     if (ip->i_flag&(IUPD|IACC|ICHG|IMOD)) \
 184:         iupdat(ip, t1, t2, waitfor); \
 185: }
 186: 
 187: #define ITIMES(ip, t1, t2) { \
 188:     if ((ip)->i_flag&(IUPD|IACC|ICHG)) { \
 189:         (ip)->i_flag |= IMOD; \
 190:         if ((ip)->i_flag&IACC) \
 191:             (ip)->i_atime = (t1)->tv_sec; \
 192:         if ((ip)->i_flag&IUPD) \
 193:             (ip)->i_mtime = (t2)->tv_sec; \
 194:         if ((ip)->i_flag&ICHG) \
 195:             (ip)->i_ctime = time.tv_sec; \
 196:         (ip)->i_flag &= ~(IACC|IUPD|ICHG); \
 197:     } \
 198: }

Defined variables

Defined struct's

Defined macros

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