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_ */