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- /*
- * The I node is the focus of all
- * file activity in unix. There is a unique
- * inode allocated for each active file,
- * each current directory, each mounted-on
- * file, text file, and the root. An inode is 'named'
- * by its dev/inumber pair. (iget/iget.c)
- * Data, from mode on, is read in
- * from permanent inode on volume.
- */
- struct inode
- {
- char i_flag;
- char i_count; /* reference count */
- int i_dev; /* device where inode resides */
- int i_number; /* i number, 1-to-1 with device address */
- int i_mode;
- char i_nlink; /* directory entries */
- char i_uid; /* owner */
- char i_gid; /* group of owner */
- char i_size0; /* most significant of size */
- char *i_size1; /* least sig */
- int i_addr[8]; /* device addresses constituting file */
- int i_lastr; /* last logical block read (for read-ahead) */
- } inode[NINODE];
-
- /* flags */
- #define ILOCK 01 /* inode is locked */
- #define IUPD 02 /* inode has been modified */
- #define IACC 04 /* inode access time to be updated */
- #define IMOUNT 010 /* inode is mounted on */
- #define IWANT 020 /* some process waiting on lock */
- #define ITEXT 040 /* inode is pure text prototype */
-
- /* modes */
- #define IALLOC 0100000 /* file is used */
- #define IFMT 060000 /* type of file */
- #define IFDIR 040000 /* directory */
- #define IFCHR 020000 /* character special */
- #define IFBLK 060000 /* block special, 0 is regular */
- #define ILARG 010000 /* large addressing algorithm */
- #define ISUID 04000 /* set user id on execution */
- #define ISGID 02000 /* set group id on execution */
- #define ISVTX 01000 /* save swapped text even after use */
- #define IREAD 0400 /* read, write, execute permissions */
- #define IWRITE 0200
- #define IEXEC 0100
-