180 lines
5.6 KiB
C
180 lines
5.6 KiB
C
/* $NetBSD: v7fs.h,v 1.2 2011/07/16 12:35:40 uch Exp $ */
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/*-
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* Copyright (c) 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by UCHIYAMA Yasushi.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _V7FS_H_
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/* 7th Edition of Unix(PDP-11) Filesystem definition. */
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#define _V7FS_H_
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#include <sys/types.h>
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#ifndef _KERNEL
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#include <inttypes.h>
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#endif
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/*
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* V7 File System
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*
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* +------------------
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* |Boot block (512byte) sector [0]
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* |
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* +------------------
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* |Super block (512byte) sector [1]
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* |
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* +------------------
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* |v7fs_inode(64byte sector [2]
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* .
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* .
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* |
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* +------------------
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* |data block sector [datablock_start_sector]
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* |
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* .
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* .
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* |
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* +------------------
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* <- [sector volume_size]
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*
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* |
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* +------------------ volume size.
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*
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* Max volume size is 8GB (24bit daddr_t)
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* Max file size is ~1GB
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*
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*/
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/* V7 type. */
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typedef uint16_t v7fs_ino_t;
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typedef uint32_t v7fs_daddr_t;
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typedef int32_t v7fs_time_t;
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typedef uint32_t v7fs_off_t;
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typedef uint16_t v7fs_dev_t;
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typedef uint16_t v7fs_mode_t;
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#define V7FS_DADDR_MAX 0x00ffffff
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#define V7FS_INODE_MAX 0xffff
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#define V7FS_BSIZE 512
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#define V7FS_BSHIFT 9
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#define V7FS_ROUND_BSIZE(x) \
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((((x) + (V7FS_BSIZE - 1)) & ~(V7FS_BSIZE - 1)))
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#define V7FS_TRUNC_BSIZE(x) ((x) & ~(V7FS_BSIZE - 1))
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#define V7FS_RESIDUE_BSIZE(x) \
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((x) - ((((x) - 1) >> V7FS_BSHIFT) << V7FS_BSHIFT))
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/* Disk location. */
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#define V7FS_BOOTBLOCK_SECTOR 0
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#define V7FS_SUPERBLOCK_SECTOR 1
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#define V7FS_ILIST_SECTOR 2
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/* Superblock */
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/* cache. */
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#define V7FS_MAX_FREEBLOCK 50
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#define V7FS_MAX_FREEINODE 100
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struct v7fs_superblock {
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/* [3 ... (datablock_start_sector-1)]are ilist */
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uint16_t datablock_start_sector;
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v7fs_daddr_t volume_size;
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int16_t nfreeblock; /* # of freeblock in superblock cache. */
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v7fs_daddr_t freeblock[V7FS_MAX_FREEBLOCK]; /* cache. */
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int16_t nfreeinode; /* # of free inode in superblock cache. */
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v7fs_ino_t freeinode[V7FS_MAX_FREEINODE]; /* cache. */
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int8_t lock_freeblock;
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int8_t lock_freeinode;
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int8_t modified;
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int8_t readonly;
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v7fs_time_t update_time;
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v7fs_daddr_t total_freeblock;
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v7fs_ino_t total_freeinode;
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} __packed;
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/* Datablock */
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#define V7FS_NADDR 13
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#define V7FS_NADDR_DIRECT 10
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#define V7FS_NADDR_INDEX1 10
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#define V7FS_NADDR_INDEX2 11
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#define V7FS_NADDR_INDEX3 12
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/* daddr index. */
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#define V7FS_DADDR_PER_BLOCK (V7FS_BSIZE / sizeof(v7fs_daddr_t))
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struct v7fs_freeblock {
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int16_t nfreeblock;
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v7fs_daddr_t freeblock[V7FS_MAX_FREEBLOCK];
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} __packed;
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/* Dirent */
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#define V7FS_NAME_MAX 14
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#define V7FS_PATH_MAX PATH_MAX /* No V7 limit. */
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#define V7FS_LINK_MAX LINK_MAX /* No V7 limit. */
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struct v7fs_dirent {
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v7fs_ino_t inode_number;
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char name[V7FS_NAME_MAX];
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} __packed; /*16byte */
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/* Inode */
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#define V7FS_BALBLK_INODE 1 /* monument */
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#define V7FS_ROOT_INODE 2
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#define V7FS_MAX_INODE(s) \
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(((s)->datablock_start_sector - V7FS_ILIST_SECTOR) * \
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V7FS_BSIZE / sizeof(struct v7fs_inode_diskimage))
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#define V7FS_INODE_PER_BLOCK \
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(V7FS_BSIZE / sizeof(struct v7fs_inode_diskimage))
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#define V7FS_ILISTBLK_MAX (V7FS_INODE_MAX / V7FS_INODE_PER_BLOCK)
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struct v7fs_inode_diskimage {
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int16_t mode;
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int16_t nlink; /* [DIR] # of child directories. [REG] link count. */
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int16_t uid;
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int16_t gid;
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v7fs_off_t filesize; /* byte */
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#define V7FS_DINODE_ADDR_LEN 40
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/* 39 used; 13 addresses of 3 byte each. */
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uint8_t addr[V7FS_DINODE_ADDR_LEN];
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/*for device node: addr[0] is major << 8 | minor. */
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v7fs_time_t atime;
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v7fs_time_t mtime;
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v7fs_time_t ctime;
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} __packed; /*64byte */
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/* File type */
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#define V7FS_IFMT 0170000 /* File type mask */
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#define V7FS_IFCHR 0020000 /* charcter device */
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#define V7FS_IFDIR 0040000 /* directory */
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#define V7FS_IFBLK 0060000 /* block device */
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#define V7FS_IFREG 0100000 /* file. */
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/* Obsoleted file type. */
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#define V7FS_IFMPC 0030000 /* multiplexed char special */
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#define V7FS_IFMPB 0070000 /* multiplexed block special */
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/* Don't apear original V7 filesystem. Found at 2.10BSD. */
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#define V7FSBSD_IFLNK 0120000 /* symbolic link */
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#define V7FSBSD_IFSOCK 0140000 /* socket */
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/* Don't apear original V7 filesystem. NetBSD. */
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#define V7FSBSD_IFFIFO 0010000 /* Named pipe. */
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#define V7FSBSD_MAXSYMLINKLEN V7FS_BSIZE
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#endif /*!_V7FS_H_ */
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