1 /* 2 * Copyright (c) 1982, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * %sccs.include.redist.c% 11 * 12 * @(#)dinode.h 8.4 (Berkeley) 07/08/94 13 */ 14 15 /* 16 * The root inode is the root of the file system. Inode 0 can't be used for 17 * normal purposes and historically bad blocks were linked to inode 1, thus 18 * the root inode is 2. (Inode 1 is no longer used for this purpose, however 19 * numerous dump tapes make this assumption, so we are stuck with it). 20 */ 21 #define ROOTINO ((ino_t)2) 22 23 /* 24 * A dinode contains all the meta-data associated with a UFS file. 25 * This structure defines the on-disk format of a dinode. 26 */ 27 28 #define NDADDR 12 /* Direct addresses in inode. */ 29 #define NIADDR 3 /* Indirect addresses in inode. */ 30 31 struct dinode { 32 u_int16_t di_mode; /* 0: IFMT, permissions; see below. */ 33 int16_t di_nlink; /* 2: File link count. */ 34 union { 35 u_int16_t oldids[2]; /* 4: Ffs: old user and group ids. */ 36 ino_t inumber; /* 4: Lfs: inode number. */ 37 } di_u; 38 u_quad_t di_size; /* 8: File byte count. */ 39 struct timespec di_atime; /* 16: Last access time. */ 40 struct timespec di_mtime; /* 24: Last modified time. */ 41 struct timespec di_ctime; /* 32: Last inode change time. */ 42 daddr_t di_db[NDADDR]; /* 40: Direct disk blocks. */ 43 daddr_t di_ib[NIADDR]; /* 88: Indirect disk blocks. */ 44 u_int32_t di_flags; /* 100: Status flags (chflags). */ 45 int32_t di_blocks; /* 104: Blocks actually held. */ 46 int32_t di_gen; /* 108: Generation number. */ 47 u_int32_t di_uid; /* 112: File owner. */ 48 u_int32_t di_gid; /* 116: File group. */ 49 int32_t di_spare[2]; /* 120: Reserved; currently unused */ 50 }; 51 52 /* 53 * The di_db fields may be overlaid with other information for 54 * file types that do not have associated disk storage. Block 55 * and character devices overlay the first data block with their 56 * dev_t value. Short symbolic links place their path in the 57 * di_db area. 58 */ 59 #define di_inumber di_u.inumber 60 #define di_ogid di_u.oldids[1] 61 #define di_ouid di_u.oldids[0] 62 #define di_rdev di_db[0] 63 #define di_shortlink di_db 64 #define MAXSYMLINKLEN ((NDADDR + NIADDR) * sizeof(daddr_t)) 65 66 /* File permissions. */ 67 #define IEXEC 0000100 /* Executable. */ 68 #define IWRITE 0000200 /* Writeable. */ 69 #define IREAD 0000400 /* Readable. */ 70 #define ISVTX 0001000 /* Sticky bit. */ 71 #define ISGID 0002000 /* Set-gid. */ 72 #define ISUID 0004000 /* Set-uid. */ 73 74 /* File types. */ 75 #define IFMT 0170000 /* Mask of file type. */ 76 #define IFIFO 0010000 /* Named pipe (fifo). */ 77 #define IFCHR 0020000 /* Character device. */ 78 #define IFDIR 0040000 /* Directory file. */ 79 #define IFBLK 0060000 /* Block device. */ 80 #define IFREG 0100000 /* Regular file. */ 81 #define IFLNK 0120000 /* Symbolic link. */ 82 #define IFSOCK 0140000 /* UNIX domain socket. */ 83