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. */ 71typedef uint16_t v7fs_ino_t; 72typedef uint32_t v7fs_daddr_t; 73typedef int32_t v7fs_time_t; 74typedef uint32_t v7fs_off_t; 75typedef uint16_t v7fs_dev_t; 76typedef 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 98struct 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)) 123struct 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. */ 133struct 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 148struct 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