1 /* $NetBSD: v7fs.h,v 1.4 2022/05/24 06:28:01 andvar Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by UCHIYAMA Yasushi. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _V7FS_H_ 33 /* 7th Edition of Unix(PDP-11) Filesystem definition. */ 34 #define _V7FS_H_ 35 #include <sys/types.h> 36 #ifndef _KERNEL 37 #include <inttypes.h> 38 #endif 39 /* 40 * V7 File System 41 * 42 * +------------------ 43 * |Boot block (512byte) sector [0] 44 * | 45 * +------------------ 46 * |Super block (512byte) sector [1] 47 * | 48 * +------------------ 49 * |v7fs_inode(64byte sector [2] 50 * . 51 * . 52 * | 53 * +------------------ 54 * |data block sector [datablock_start_sector] 55 * | 56 * . 57 * . 58 * | 59 * +------------------ 60 * <- [sector volume_size] 61 * 62 * | 63 * +------------------ volume size. 64 * 65 * Max volume size is 8GB (24bit daddr_t) 66 * Max file size is ~1GB 67 * 68 */ 69 70 /* V7 type. */ 71 typedef uint16_t v7fs_ino_t; 72 typedef uint32_t v7fs_daddr_t; 73 typedef int32_t v7fs_time_t; 74 typedef uint32_t v7fs_off_t; 75 typedef uint16_t v7fs_dev_t; 76 typedef uint16_t v7fs_mode_t; 77 #define V7FS_DADDR_MAX 0x00ffffff 78 #define V7FS_INODE_MAX 0xffff 79 80 #define V7FS_BSIZE 512 81 #define V7FS_BSHIFT 9 82 #define V7FS_ROUND_BSIZE(x) \ 83 ((((x) + (V7FS_BSIZE - 1)) & ~(V7FS_BSIZE - 1))) 84 #define V7FS_TRUNC_BSIZE(x) ((x) & ~(V7FS_BSIZE - 1)) 85 86 #define V7FS_RESIDUE_BSIZE(x) \ 87 ((x) - ((((x) - 1) >> V7FS_BSHIFT) << V7FS_BSHIFT)) 88 89 /* Disk location. */ 90 #define V7FS_BOOTBLOCK_SECTOR 0 91 #define V7FS_SUPERBLOCK_SECTOR 1 92 #define V7FS_ILIST_SECTOR 2 93 94 /* Superblock */ 95 /* cache. */ 96 #define V7FS_MAX_FREEBLOCK 50 97 #define V7FS_MAX_FREEINODE 100 98 struct v7fs_superblock { 99 /* [3 ... (datablock_start_sector-1)]are ilist */ 100 uint16_t datablock_start_sector; 101 v7fs_daddr_t volume_size; 102 int16_t nfreeblock; /* # of freeblock in superblock cache. */ 103 v7fs_daddr_t freeblock[V7FS_MAX_FREEBLOCK]; /* cache. */ 104 int16_t nfreeinode; /* # of free inode in superblock cache. */ 105 v7fs_ino_t freeinode[V7FS_MAX_FREEINODE]; /* cache. */ 106 int8_t lock_freeblock; 107 int8_t lock_freeinode; 108 int8_t modified; 109 int8_t readonly; 110 v7fs_time_t update_time; 111 v7fs_daddr_t total_freeblock; 112 v7fs_ino_t total_freeinode; 113 } __packed; 114 115 /* Datablock */ 116 #define V7FS_NADDR 13 117 #define V7FS_NADDR_DIRECT 10 118 #define V7FS_NADDR_INDEX1 10 119 #define V7FS_NADDR_INDEX2 11 120 #define V7FS_NADDR_INDEX3 12 121 /* daddr index. */ 122 #define V7FS_DADDR_PER_BLOCK (V7FS_BSIZE / sizeof(v7fs_daddr_t)) 123 struct v7fs_freeblock { 124 int16_t nfreeblock; 125 v7fs_daddr_t freeblock[V7FS_MAX_FREEBLOCK]; 126 } __packed; 127 128 129 /* Dirent */ 130 #define V7FS_NAME_MAX 14 131 #define V7FS_PATH_MAX PATH_MAX /* No V7 limit. */ 132 #define V7FS_LINK_MAX LINK_MAX /* No V7 limit. */ 133 struct v7fs_dirent { 134 v7fs_ino_t inode_number; 135 char name[V7FS_NAME_MAX]; 136 } __packed; /*16byte */ 137 138 /* Inode */ 139 #define V7FS_BALBLK_INODE 1 /* monument */ 140 #define V7FS_ROOT_INODE 2 141 #define V7FS_MAX_INODE(s) \ 142 (((s)->datablock_start_sector - V7FS_ILIST_SECTOR) * \ 143 V7FS_BSIZE / sizeof(struct v7fs_inode_diskimage)) 144 #define V7FS_INODE_PER_BLOCK \ 145 (V7FS_BSIZE / sizeof(struct v7fs_inode_diskimage)) 146 #define V7FS_ILISTBLK_MAX (V7FS_INODE_MAX / V7FS_INODE_PER_BLOCK) 147 148 struct v7fs_inode_diskimage { 149 int16_t mode; 150 int16_t nlink; /* [DIR] # of child directories. [REG] link count. */ 151 int16_t uid; 152 int16_t gid; 153 v7fs_off_t filesize; /* byte */ 154 #define V7FS_DINODE_ADDR_LEN 40 155 /* 39 used; 13 addresses of 3 byte each. */ 156 uint8_t addr[V7FS_DINODE_ADDR_LEN]; 157 /*for device node: addr[0] is major << 8 | minor. */ 158 v7fs_time_t atime; 159 v7fs_time_t mtime; 160 v7fs_time_t ctime; 161 } __packed; /*64byte */ 162 163 /* File type */ 164 #define V7FS_IFMT 0170000 /* File type mask */ 165 #define V7FS_IFCHR 0020000 /* character device */ 166 #define V7FS_IFDIR 0040000 /* directory */ 167 #define V7FS_IFBLK 0060000 /* block device */ 168 #define V7FS_IFREG 0100000 /* file. */ 169 /* Obsoleted file type. */ 170 #define V7FS_IFMPC 0030000 /* multiplexed char special */ 171 #define V7FS_IFMPB 0070000 /* multiplexed block special */ 172 /* Don't appear original V7 filesystem. Found at 2.10BSD. */ 173 #define V7FSBSD_IFLNK 0120000 /* symbolic link */ 174 #define V7FSBSD_IFSOCK 0140000 /* socket */ 175 /* Don't appear original V7 filesystem. NetBSD. */ 176 #define V7FSBSD_IFFIFO 0010000 /* Named pipe. */ 177 178 #define V7FSBSD_MAXSYMLINKLEN V7FS_BSIZE 179 180 #endif /*!_V7FS_H_ */ 181