1 /* inode.h 4.11 82/04/19 */ 2 3 /* inode.h 2.1 3/25/82 */ 4 5 /* 6 * The I node is the focus of all file activity in UNIX. 7 * There is a unique inode allocated for each active file, 8 * each current directory, each mounted-on file, text file, and the root. 9 * An inode is 'named' by its dev/inumber pair. (iget/iget.c) 10 * Data in icommon is read in from permanent inode on volume. 11 */ 12 13 #define NDADDR 8 /* direct addresses in inode */ 14 #define NIADDR 2 /* indirect addresses in inode */ 15 16 struct inode { 17 char i_flag; 18 char i_count; /* reference count */ 19 dev_t i_dev; /* device where inode resides */ 20 ino_t i_number; /* i number, 1-to-1 with device address */ 21 long i_hlink; /* link in hash chain (iget/iput/ifind) */ 22 struct fs *i_fs; /* file sys associated with this inode */ 23 union { 24 daddr_t if_lastr; /* last read (read-ahead) */ 25 struct socket *is_socket; 26 } i_un; 27 struct icommon 28 { 29 u_short ic_mode; /* 0: mode and type of file */ 30 short ic_nlink; /* 2: number of links to file */ 31 short ic_uid; /* 4: owner's user id */ 32 short ic_gid; /* 6: owner's group id */ 33 off_t ic_size; /* 8: number of bytes in file */ 34 daddr_t ic_db[NDADDR]; /* 12: disk block addresses */ 35 daddr_t ic_ib[NIADDR]; /* 44: indirect blocks */ 36 time_t ic_atime; /* 52: time last accessed */ 37 time_t ic_mtime; /* 56: time last modified */ 38 time_t ic_ctime; /* 60: time created */ 39 } i_ic; 40 }; 41 42 struct dinode { 43 union { 44 struct icommon di_icom; 45 char di_size[64]; 46 } di_un; 47 }; 48 49 #define i_mode i_ic.ic_mode 50 #define i_nlink i_ic.ic_nlink 51 #define i_uid i_ic.ic_uid 52 #define i_gid i_ic.ic_gid 53 #define i_size i_ic.ic_size 54 #define i_db i_ic.ic_db 55 #define i_ib i_ic.ic_ib 56 #define i_atime i_ic.ic_atime 57 #define i_mtime i_ic.ic_mtime 58 #define i_ctime i_ic.ic_ctime 59 #define i_rdev i_ic.ic_db[0] 60 #define i_lastr i_un.if_lastr 61 #define i_socket is_socket 62 63 #define di_ic di_un.di_icom 64 #define di_mode di_ic.ic_mode 65 #define di_nlink di_ic.ic_nlink 66 #define di_uid di_ic.ic_uid 67 #define di_gid di_ic.ic_gid 68 #define di_size di_ic.ic_size 69 #define di_db di_ic.ic_db 70 #define di_ib di_ic.ic_ib 71 #define di_atime di_ic.ic_atime 72 #define di_mtime di_ic.ic_mtime 73 #define di_ctime di_ic.ic_ctime 74 #define di_rdev di_ic.ic_db[0] 75 76 #ifdef KERNEL 77 extern struct inode *inode; /* The inode table itself */ 78 extern struct inode *inodeNINODE; /* The end of the inode table */ 79 extern int ninode; /* number of slots in the table */ 80 81 struct inode *rootdir; /* pointer to inode of root directory */ 82 83 struct inode *ialloc(); 84 struct inode *ifind(); 85 struct inode *iget(); 86 struct inode *owner(); 87 struct inode *maknode(); 88 struct inode *namei(); 89 #endif 90 91 /* flags */ 92 #define ILOCK 01 /* inode is locked */ 93 #define IUPD 02 /* file has been modified */ 94 #define IACC 04 /* inode access time to be updated */ 95 #define IMOUNT 010 /* inode is mounted on */ 96 #define IWANT 020 /* some process waiting on lock */ 97 #define ITEXT 040 /* inode is pure text prototype */ 98 #define ICHG 0100 /* inode has been changed */ 99 100 /* modes */ 101 #define IFMT 0170000 /* type of file */ 102 #define IFCHR 0020000 /* character special */ 103 #define IFDIR 0040000 /* directory */ 104 #define IFBLK 0060000 /* block special */ 105 #define IFREG 0100000 /* regular */ 106 #define IFLNK 0120000 /* symbolic link */ 107 #define IFPORTAL 0140000 /* portal */ 108 #define ISUID 04000 /* set user id on execution */ 109 #define ISGID 02000 /* set group id on execution */ 110 #define ISVTX 01000 /* save swapped text even after use */ 111 #define IREAD 0400 /* read, write, execute permissions */ 112 #define IWRITE 0200 113 #define IEXEC 0100 114