/* $NetBSD: v7fs.h,v 1.4 2022/05/24 06:28:01 andvar Exp $ */ /*- * Copyright (c) 2011 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by UCHIYAMA Yasushi. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _V7FS_H_ /* 7th Edition of Unix(PDP-11) Filesystem definition. */ #define _V7FS_H_ #include <sys/types.h> #ifndef _KERNEL #include <inttypes.h> #endif /* * V7 File System * * +------------------ * |Boot block (512byte) sector [0] * | * +------------------ * |Super block (512byte) sector [1] * | * +------------------ * |v7fs_inode(64byte sector [2] * . * . * | * +------------------ * |data block sector [datablock_start_sector] * | * . * . * | * +------------------ * <- [sector volume_size] * * | * +------------------ volume size. * * Max volume size is 8GB (24bit daddr_t) * Max file size is ~1GB * */ /* V7 type. */ typedef uint16_t v7fs_ino_t; typedef uint32_t v7fs_daddr_t; typedef int32_t v7fs_time_t; typedef uint32_t v7fs_off_t; typedef uint16_t v7fs_dev_t; typedef uint16_t v7fs_mode_t; #define V7FS_DADDR_MAX 0x00ffffff #define V7FS_INODE_MAX 0xffff #define V7FS_BSIZE 512 #define V7FS_BSHIFT 9 #define V7FS_ROUND_BSIZE(x) \ ((((x) + (V7FS_BSIZE - 1)) & ~(V7FS_BSIZE - 1))) #define V7FS_TRUNC_BSIZE(x) ((x) & ~(V7FS_BSIZE - 1)) #define V7FS_RESIDUE_BSIZE(x) \ ((x) - ((((x) - 1) >> V7FS_BSHIFT) << V7FS_BSHIFT)) /* Disk location. */ #define V7FS_BOOTBLOCK_SECTOR 0 #define V7FS_SUPERBLOCK_SECTOR 1 #define V7FS_ILIST_SECTOR 2 /* Superblock */ /* cache. */ #define V7FS_MAX_FREEBLOCK 50 #define V7FS_MAX_FREEINODE 100 struct v7fs_superblock { /* [3 ... (datablock_start_sector-1)]are ilist */ uint16_t datablock_start_sector; v7fs_daddr_t volume_size; int16_t nfreeblock; /* # of freeblock in superblock cache. */ v7fs_daddr_t freeblock[V7FS_MAX_FREEBLOCK]; /* cache. */ int16_t nfreeinode; /* # of free inode in superblock cache. */ v7fs_ino_t freeinode[V7FS_MAX_FREEINODE]; /* cache. */ int8_t lock_freeblock; int8_t lock_freeinode; int8_t modified; int8_t readonly; v7fs_time_t update_time; v7fs_daddr_t total_freeblock; v7fs_ino_t total_freeinode; } __packed; /* Datablock */ #define V7FS_NADDR 13 #define V7FS_NADDR_DIRECT 10 #define V7FS_NADDR_INDEX1 10 #define V7FS_NADDR_INDEX2 11 #define V7FS_NADDR_INDEX3 12 /* daddr index. */ #define V7FS_DADDR_PER_BLOCK (V7FS_BSIZE / sizeof(v7fs_daddr_t)) struct v7fs_freeblock { int16_t nfreeblock; v7fs_daddr_t freeblock[V7FS_MAX_FREEBLOCK]; } __packed; /* Dirent */ #define V7FS_NAME_MAX 14 #define V7FS_PATH_MAX PATH_MAX /* No V7 limit. */ #define V7FS_LINK_MAX LINK_MAX /* No V7 limit. */ struct v7fs_dirent { v7fs_ino_t inode_number; char name[V7FS_NAME_MAX]; } __packed; /*16byte */ /* Inode */ #define V7FS_BALBLK_INODE 1 /* monument */ #define V7FS_ROOT_INODE 2 #define V7FS_MAX_INODE(s) \ (((s)->datablock_start_sector - V7FS_ILIST_SECTOR) * \ V7FS_BSIZE / sizeof(struct v7fs_inode_diskimage)) #define V7FS_INODE_PER_BLOCK \ (V7FS_BSIZE / sizeof(struct v7fs_inode_diskimage)) #define V7FS_ILISTBLK_MAX (V7FS_INODE_MAX / V7FS_INODE_PER_BLOCK) struct v7fs_inode_diskimage { int16_t mode; int16_t nlink; /* [DIR] # of child directories. [REG] link count. */ int16_t uid; int16_t gid; v7fs_off_t filesize; /* byte */ #define V7FS_DINODE_ADDR_LEN 40 /* 39 used; 13 addresses of 3 byte each. */ uint8_t addr[V7FS_DINODE_ADDR_LEN]; /*for device node: addr[0] is major << 8 | minor. */ v7fs_time_t atime; v7fs_time_t mtime; v7fs_time_t ctime; } __packed; /*64byte */ /* File type */ #define V7FS_IFMT 0170000 /* File type mask */ #define V7FS_IFCHR 0020000 /* character device */ #define V7FS_IFDIR 0040000 /* directory */ #define V7FS_IFBLK 0060000 /* block device */ #define V7FS_IFREG 0100000 /* file. */ /* Obsoleted file type. */ #define V7FS_IFMPC 0030000 /* multiplexed char special */ #define V7FS_IFMPB 0070000 /* multiplexed block special */ /* Don't appear original V7 filesystem. Found at 2.10BSD. */ #define V7FSBSD_IFLNK 0120000 /* symbolic link */ #define V7FSBSD_IFSOCK 0140000 /* socket */ /* Don't appear original V7 filesystem. NetBSD. */ #define V7FSBSD_IFFIFO 0010000 /* Named pipe. */ #define V7FSBSD_MAXSYMLINKLEN V7FS_BSIZE #endif /*!_V7FS_H_ */
