1 /* inode.h 4.23 83/05/21 */ 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 #ifdef sun 69 #define i_size i_ic.ic_size.val[1] 70 #endif 71 #define i_db i_ic.ic_db 72 #define i_ib i_ic.ic_ib 73 #define i_atime i_ic.ic_atime 74 #define i_mtime i_ic.ic_mtime 75 #define i_ctime i_ic.ic_ctime 76 #define i_blocks i_ic.ic_blocks 77 #define i_rdev i_ic.ic_db[0] 78 #define i_lastr i_un.if_lastr 79 #define i_socket i_un.is_socket 80 #define i_forw i_chain[0] 81 #define i_back i_chain[1] 82 #define i_freef i_un.i_fr.if_freef 83 #define i_freeb i_un.i_fr.if_freeb 84 85 #define di_ic di_un.di_icom 86 #define di_mode di_ic.ic_mode 87 #define di_nlink di_ic.ic_nlink 88 #define di_uid di_ic.ic_uid 89 #define di_gid di_ic.ic_gid 90 #ifdef vax 91 #define di_size di_ic.ic_size.val[0] 92 #endif 93 #ifdef sun 94 #define di_size di_ic.ic_size.val[1] 95 #endif 96 #define di_db di_ic.ic_db 97 #define di_ib di_ic.ic_ib 98 #define di_atime di_ic.ic_atime 99 #define di_mtime di_ic.ic_mtime 100 #define di_ctime di_ic.ic_ctime 101 #define di_rdev di_ic.ic_db[0] 102 #define di_blocks di_ic.ic_blocks 103 104 #ifdef KERNEL 105 struct inode *inode; /* the inode table itself */ 106 struct inode *inodeNINODE; /* the end of the inode table */ 107 int ninode; /* number of slots in the table */ 108 109 struct inode *rootdir; /* pointer to inode of root directory */ 110 111 struct inode *ialloc(); 112 struct inode *iget(); 113 #ifdef notdef 114 struct inode *ifind(); 115 #endif 116 struct inode *owner(); 117 struct inode *maknode(); 118 struct inode *namei(); 119 120 ino_t dirpref(); 121 #endif 122 123 /* flags */ 124 #define ILOCKED 0x1 /* inode is locked */ 125 #define IUPD 0x2 /* file has been modified */ 126 #define IACC 0x4 /* inode access time to be updated */ 127 #define IMOUNT 0x8 /* inode is mounted on */ 128 #define IWANT 0x10 /* some process waiting on lock */ 129 #define ITEXT 0x20 /* inode is pure text prototype */ 130 #define ICHG 0x40 /* inode has been changed */ 131 #define ISHLOCK 0x80 /* file has shared lock */ 132 #define IEXLOCK 0x100 /* file has exclusive lock */ 133 #define ILWAIT 0x200 /* someone waiting on file lock */ 134 135 /* modes */ 136 #define IFMT 0170000 /* type of file */ 137 #define IFCHR 0020000 /* character special */ 138 #define IFDIR 0040000 /* directory */ 139 #define IFBLK 0060000 /* block special */ 140 #define IFREG 0100000 /* regular */ 141 #define IFLNK 0120000 /* symbolic link */ 142 #define IFSOCK 0140000 /* socket */ 143 144 #define ISUID 04000 /* set user id on execution */ 145 #define ISGID 02000 /* set group id on execution */ 146 #define ISVTX 01000 /* save swapped text even after use */ 147 #define IREAD 0400 /* read, write, execute permissions */ 148 #define IWRITE 0200 149 #define IEXEC 0100 150 151 #define ILOCK(ip) { \ 152 while ((ip)->i_flag & ILOCKED) { \ 153 (ip)->i_flag |= IWANT; \ 154 sleep((caddr_t)(ip), PINOD); \ 155 } \ 156 (ip)->i_flag |= ILOCKED; \ 157 } 158 159 #define IUNLOCK(ip) { \ 160 (ip)->i_flag &= ~ILOCKED; \ 161 if ((ip)->i_flag&IWANT) { \ 162 (ip)->i_flag &= ~IWANT; \ 163 wakeup((caddr_t)(ip)); \ 164 } \ 165 } 166 167 #define IUPDAT(ip, t1, t2, waitfor) { \ 168 if (ip->i_flag&(IUPD|IACC|ICHG)) \ 169 iupdat(ip, t1, t2, waitfor); \ 170 } 171