1 /* $NetBSD: efs_dinode.h,v 1.2 2007/06/30 15:56:16 rumble Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Stephen M. Rumble <rumble@ephemeral.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* 20 * EFS on-disk inode format. 21 * 22 * See IRIX inode(4) 23 */ 24 25 #ifndef _FS_EFS_EFS_DINODE_H_ 26 #define _FS_EFS_EFS_DINODE_H_ 27 28 /* 29 * Historical locations are always good. 30 */ 31 #define EFS_ROOTINO ((ino_t)2) 32 33 /* 34 * EFS on-disk inode structure (128 bytes) 35 * 36 * [0] - NetBSD native uid_t is uint32_t. 37 * [1] - NetBSD native gid_t is uint32_t. 38 * [2] - NetBSD native off_t is int64_t. 39 * [3] - See notes for di_u below for meanings of di_numextents. 40 * [4] - Always 0 with EFS. Apparently it could take on other values when 41 * used in conjunction with AFS. 42 */ 43 44 #define EFS_DIRECTEXTENTS 12 45 struct efs_dinode { 46 uint16_t di_mode; /* 0: file type and permissions */ 47 int16_t di_nlink; /* 2: link count (minimum 2) */ 48 uint16_t di_uid; /* 4: user ID [0] */ 49 uint16_t di_gid; /* 6: group ID [1] */ 50 int32_t di_size; /* 8: file size (in bytes) [2] */ 51 uint32_t di_atime; /* 12: file access time */ 52 uint32_t di_mtime; /* 16: file modification time */ 53 uint32_t di_ctime; /* 20: inode modification time */ 54 int32_t di_gen; /* 24: inode generation number */ 55 int16_t di_numextents; /* 28: number of extents in file [3] */ 56 uint8_t di_version; /* 30: inode version [4] */ 57 uint8_t di_spare; /* 31: unused */ 58 59 union { 60 /* 61 * If di_numextents <= EFS_DIRECTEXTENTS, _di_extents contains 62 * direct extent descriptors. 63 * 64 * else (di_numextents > EFS_DIRECTEXTENTS), _di_extents 65 * contains indirect extent descriptors. 66 * 67 * If indirect extents are being used, extents[0].ex_offset 68 * contains the number of indirect extents, i.e. the valid 69 * offsets in 'extents' are: 70 * extents[0 ... (extents[0].ex_offset - 1)] 71 * It's not presently known if the ex_offset fields in 72 * extents[1 ... EFS_DIRECTEXTENTS] have any meaning. 73 */ 74 struct efs_dextent extents[EFS_DIRECTEXTENTS]; 75 76 /* 77 * If di_numextents == 0 and di_mode indicates a symlink, the 78 * symlink path is inlined into _di_symlink. Otherwise, the 79 * symlink exists in extents. 80 * 81 * Note that the symlink is stored without nul-termination, 82 * and di_size reflects this length. 83 */ 84 char symlink[sizeof(struct efs_dextent) * EFS_DIRECTEXTENTS]; 85 86 /* 87 * If di_numextents == 0 and di_mode indicates a character or 88 * block special file, the device tag is contained in _di_dev. 89 * 90 * Note that IRIX moved from 16bit to 32bit dev_t's at some 91 * point and a new field was added. It appears that when 32bit 92 * dev_t's are used, di_odev is set to 0xffff. 93 */ 94 struct { 95 uint16_t dev_old; 96 uint32_t dev_new; 97 } __packed dev; 98 } di_u; 99 } __packed; 100 101 #define di_extents di_u.extents 102 #define di_symlink di_u.symlink 103 #define di_odev di_u.dev.dev_old 104 #define di_ndev di_u.dev.dev_new 105 106 #define EFS_DINODE_SIZE sizeof(struct efs_dinode) 107 #define EFS_DINODES_PER_BB (EFS_BB_SIZE / EFS_DINODE_SIZE) 108 109 #define EFS_DINODE_ODEV_INVALID (0xffff) 110 #define EFS_DINODE_ODEV_MAJ(_x) (((_x) >> 8) & 0x7f) 111 #define EFS_DINODE_ODEV_MIN(_x) (((_x) >> 0) & 0xff) 112 #define EFS_DINODE_NDEV_MAJ(_x) (((_x) >> 18) & 0x1ff) 113 #define EFS_DINODE_NDEV_MIN(_x) (((_x) >> 0) & 0x3ffff) 114 115 /* EFS file permissions. */ 116 #define EFS_IEXEC 0000100 /* executable */ 117 #define EFS_IWRITE 0000200 /* writable */ 118 #define EFS_IREAD 0000400 /* readable */ 119 #define EFS_ISVTX 0001000 /* sticky bit */ 120 #define EFS_ISGID 0002000 /* setgid */ 121 #define EFS_ISUID 0004000 /* setuid */ 122 123 /* EFS file types. */ 124 #define EFS_IFMT 0170000 /* file type mask */ 125 #define EFS_IFIFO 0010000 /* named pipe */ 126 #define EFS_IFCHR 0020000 /* character device */ 127 #define EFS_IFDIR 0040000 /* directory */ 128 #define EFS_IFBLK 0060000 /* block device */ 129 #define EFS_IFREG 0100000 /* regular file */ 130 #define EFS_IFLNK 0120000 /* symlink */ 131 #define EFS_IFSOCK 0140000 /* UNIX domain socket */ 132 133 #endif /* !_FS_EFS_EFS_DINODE_H_ */ 134