/* @(#)inode.h 1.1 */ /* * 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. */ #define NADDR 13 #define NSADDR (NADDR*sizeof(daddr_t)/sizeof(short)) struct inode { char i_flag; cnt_t i_count; /* reference count */ dev_t i_dev; /* device where inode resides */ ino_t i_number; /* i number, 1-to-1 with device address */ ushort i_mode; short i_nlink; /* directory entries */ ushort i_uid; /* owner */ ushort i_gid; /* group of owner */ off_t i_size; /* size of file */ struct { union { daddr_t *i_a; /* if normal file/directory */ short *i_f; /* if fifo's */ dev_t i_r; /* if special */ } i_p; daddr_t i_l; /* last logical block read (for read-ahead) */ }i_blks; }; extern struct inode inode[]; /* The inode table itself */ extern daddr_t iblk[][NADDR]; /* Inode block cache */ /* flags */ #define ILOCK 01 /* inode is locked */ #define IUPD 02 /* file 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 */ #define ICHG 0100 /* inode has been changed */ #define IADDR 0200 /* i_a points to iblk addrs */ /* modes */ #define IFMT 0170000 /* type of file */ #define IFREE 0000000 /* Free */ #define IFDIR 0040000 /* directory */ #define IFCHR 0020000 /* character special */ #define IFBLK 0060000 /* block special */ #define IFREG 0100000 /* regular */ #define IFMPC 0030000 /* multiplexed char special */ #define IFMPB 0070000 /* multiplexed block special */ #define IFIFO 0010000 /* fifo special */ #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 #define i_addr i_blks.i_p.i_a #define i_lastr i_blks.i_l #define i_rdev i_blks.i_p.i_r #define i_faddr i_blks.i_p.i_a #define NFADDR 10 #define PIPSIZ NFADDR*BSIZE #define i_frptr i_blks.i_p.i_f[NSADDR-5] #define i_fwptr i_blks.i_p.i_f[NSADDR-4] #define i_frcnt i_blks.i_p.i_f[NSADDR-3] #define i_fwcnt i_blks.i_p.i_f[NSADDR-2] #define i_fflag i_blks.i_p.i_f[NSADDR-1] #define IFIR 01 #define IFIW 02