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1.1 ! root 1: /* inode.h 6.1 83/07/29 */ ! 2: ! 3: /* ! 4: * The I node is the focus of all file activity in UNIX. ! 5: * There is a unique inode allocated for each active file, ! 6: * each current directory, each mounted-on file, text file, and the root. ! 7: * An inode is 'named' by its dev/inumber pair. (iget/iget.c) ! 8: * Data in icommon is read in from permanent inode on volume. ! 9: */ ! 10: ! 11: #define NDADDR 12 /* direct addresses in inode */ ! 12: #define NIADDR 3 /* indirect addresses in inode */ ! 13: ! 14: struct inode { ! 15: struct inode *i_chain[2]; /* must be first */ ! 16: u_short i_flag; ! 17: u_short i_count; /* reference count */ ! 18: dev_t i_dev; /* device where inode resides */ ! 19: u_short i_shlockc; /* count of shared locks on inode */ ! 20: u_short i_exlockc; /* count of exclusive locks on inode */ ! 21: ino_t i_number; /* i number, 1-to-1 with device address */ ! 22: struct fs *i_fs; /* file sys associated with this inode */ ! 23: struct dquot *i_dquot; /* quota structure controlling this file */ ! 24: union { ! 25: daddr_t if_lastr; /* last read (read-ahead) */ ! 26: struct socket *is_socket; ! 27: struct { ! 28: struct inode *if_freef; /* free list forward */ ! 29: struct inode **if_freeb; /* free list back */ ! 30: } i_fr; ! 31: } i_un; ! 32: struct icommon ! 33: { ! 34: u_short ic_mode; /* 0: mode and type of file */ ! 35: short ic_nlink; /* 2: number of links to file */ ! 36: short ic_uid; /* 4: owner's user id */ ! 37: short ic_gid; /* 6: owner's group id */ ! 38: quad ic_size; /* 8: number of bytes in file */ ! 39: time_t ic_atime; /* 16: time last accessed */ ! 40: long ic_atspare; ! 41: time_t ic_mtime; /* 24: time last modified */ ! 42: long ic_mtspare; ! 43: time_t ic_ctime; /* 32: last time inode changed */ ! 44: long ic_ctspare; ! 45: daddr_t ic_db[NDADDR]; /* 40: disk block addresses */ ! 46: daddr_t ic_ib[NIADDR]; /* 88: indirect blocks */ ! 47: long ic_flags; /* 100: status, currently unused */ ! 48: long ic_blocks; /* 104: blocks actually held */ ! 49: long ic_spare[5]; /* 108: reserved, currently unused */ ! 50: } i_ic; ! 51: }; ! 52: ! 53: struct dinode { ! 54: union { ! 55: struct icommon di_icom; ! 56: char di_size[128]; ! 57: } di_un; ! 58: }; ! 59: ! 60: #define i_mode i_ic.ic_mode ! 61: #define i_nlink i_ic.ic_nlink ! 62: #define i_uid i_ic.ic_uid ! 63: #define i_gid i_ic.ic_gid ! 64: /* ugh! -- must be fixed */ ! 65: #ifdef vax ! 66: #define i_size i_ic.ic_size.val[0] ! 67: #endif ! 68: #define i_db i_ic.ic_db ! 69: #define i_ib i_ic.ic_ib ! 70: #define i_atime i_ic.ic_atime ! 71: #define i_mtime i_ic.ic_mtime ! 72: #define i_ctime i_ic.ic_ctime ! 73: #define i_blocks i_ic.ic_blocks ! 74: #define i_rdev i_ic.ic_db[0] ! 75: #define i_lastr i_un.if_lastr ! 76: #define i_socket i_un.is_socket ! 77: #define i_forw i_chain[0] ! 78: #define i_back i_chain[1] ! 79: #define i_freef i_un.i_fr.if_freef ! 80: #define i_freeb i_un.i_fr.if_freeb ! 81: ! 82: #define di_ic di_un.di_icom ! 83: #define di_mode di_ic.ic_mode ! 84: #define di_nlink di_ic.ic_nlink ! 85: #define di_uid di_ic.ic_uid ! 86: #define di_gid di_ic.ic_gid ! 87: #ifdef vax ! 88: #define di_size di_ic.ic_size.val[0] ! 89: #endif ! 90: #define di_db di_ic.ic_db ! 91: #define di_ib di_ic.ic_ib ! 92: #define di_atime di_ic.ic_atime ! 93: #define di_mtime di_ic.ic_mtime ! 94: #define di_ctime di_ic.ic_ctime ! 95: #define di_rdev di_ic.ic_db[0] ! 96: #define di_blocks di_ic.ic_blocks ! 97: ! 98: #ifdef KERNEL ! 99: struct inode *inode; /* the inode table itself */ ! 100: struct inode *inodeNINODE; /* the end of the inode table */ ! 101: int ninode; /* number of slots in the table */ ! 102: ! 103: struct inode *rootdir; /* pointer to inode of root directory */ ! 104: ! 105: struct inode *ialloc(); ! 106: struct inode *iget(); ! 107: #ifdef notdef ! 108: struct inode *ifind(); ! 109: #endif ! 110: struct inode *owner(); ! 111: struct inode *maknode(); ! 112: struct inode *namei(); ! 113: ! 114: ino_t dirpref(); ! 115: #endif ! 116: ! 117: /* flags */ ! 118: #define ILOCKED 0x1 /* inode is locked */ ! 119: #define IUPD 0x2 /* file has been modified */ ! 120: #define IACC 0x4 /* inode access time to be updated */ ! 121: #define IMOUNT 0x8 /* inode is mounted on */ ! 122: #define IWANT 0x10 /* some process waiting on lock */ ! 123: #define ITEXT 0x20 /* inode is pure text prototype */ ! 124: #define ICHG 0x40 /* inode has been changed */ ! 125: #define ISHLOCK 0x80 /* file has shared lock */ ! 126: #define IEXLOCK 0x100 /* file has exclusive lock */ ! 127: #define ILWAIT 0x200 /* someone waiting on file lock */ ! 128: ! 129: /* modes */ ! 130: #define IFMT 0170000 /* type of file */ ! 131: #define IFCHR 0020000 /* character special */ ! 132: #define IFDIR 0040000 /* directory */ ! 133: #define IFBLK 0060000 /* block special */ ! 134: #define IFREG 0100000 /* regular */ ! 135: #define IFLNK 0120000 /* symbolic link */ ! 136: #define IFSOCK 0140000 /* socket */ ! 137: ! 138: #define ISUID 04000 /* set user id on execution */ ! 139: #define ISGID 02000 /* set group id on execution */ ! 140: #define ISVTX 01000 /* save swapped text even after use */ ! 141: #define IREAD 0400 /* read, write, execute permissions */ ! 142: #define IWRITE 0200 ! 143: #define IEXEC 0100 ! 144: ! 145: #define ILOCK(ip) { \ ! 146: while ((ip)->i_flag & ILOCKED) { \ ! 147: (ip)->i_flag |= IWANT; \ ! 148: sleep((caddr_t)(ip), PINOD); \ ! 149: } \ ! 150: (ip)->i_flag |= ILOCKED; \ ! 151: } ! 152: ! 153: #define IUNLOCK(ip) { \ ! 154: (ip)->i_flag &= ~ILOCKED; \ ! 155: if ((ip)->i_flag&IWANT) { \ ! 156: (ip)->i_flag &= ~IWANT; \ ! 157: wakeup((caddr_t)(ip)); \ ! 158: } \ ! 159: } ! 160: ! 161: #define IUPDAT(ip, t1, t2, waitfor) { \ ! 162: if (ip->i_flag&(IUPD|IACC|ICHG)) \ ! 163: iupdat(ip, t1, t2, waitfor); \ ! 164: }
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