bfs.h revision 1.4
1 /* $NetBSD: bfs.h,v 1.4 2007/12/25 18:33:44 perry Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #ifndef _FS_SYSVBFS_BFS_H_ 40 #define _FS_SYSVBFS_BFS_H_ 41 /* 42 * Boot File System 43 * 44 * +---------- 45 * |bfs_super_block (512byte) 46 * | 1 sector 47 * | 48 * +---------- 49 * |bfs_inode (64byte) * 8 50 * | . 1 sector 51 * |bfs_inode 52 * +---------- <--- bfs_super_block.header.data_start 53 * |DATA BLOCK 54 * | . 55 * | . 56 * | 57 * +---------- <--- bfs_super_block.header.data_end 58 */ 59 60 /* BFS specification */ 61 #define BFS_SECTOR 0 /* no offset */ 62 #define BFS_MAGIC 0x1badface 63 #define BFS_FILENAME_MAXLEN 14 64 #define BFS_ROOT_INODE 2 65 #define BFS_BSIZE 512 66 #define BFS_BSHIFT 9 67 68 struct bfs_super_block_header { 69 uint32_t magic; 70 uint32_t data_start_byte; 71 uint32_t data_end_byte; 72 } __packed; 73 74 struct bfs_compaction { 75 uint32_t from; 76 uint32_t to; 77 uint32_t from_backup; 78 uint32_t to_backup; 79 } __packed; 80 81 struct bfs_fileattr { 82 uint32_t type; 83 uint32_t mode; 84 int32_t uid; 85 int32_t gid; 86 uint32_t nlink; 87 int32_t atime; 88 int32_t mtime; 89 int32_t ctime; 90 int32_t padding[4]; 91 } __packed; /* 48byte */ 92 93 struct bfs_inode { 94 uint16_t number; /* 0 */ 95 int16_t padding; 96 uint32_t start_sector; /* 4 */ 97 uint32_t end_sector; /* 8 */ 98 uint32_t eof_offset_byte; /* 12 (offset from super block start) */ 99 struct bfs_fileattr attr; /* 16 */ 100 } __packed; /* 64byte */ 101 102 struct bfs_super_block { 103 struct bfs_super_block_header header; 104 struct bfs_compaction compaction; 105 char fsname[6]; 106 char volume[6]; 107 int32_t padding[118]; 108 } __packed; 109 110 struct bfs_dirent { 111 uint16_t inode; 112 char name[BFS_FILENAME_MAXLEN]; 113 } __packed; /* 16byte */ 114 115 #if defined _KERNEL || defined _STANDALONE 116 /* Software definition */ 117 struct sector_io_ops; 118 struct bfs { 119 int start_sector; 120 /* Super block */ 121 struct bfs_super_block *super_block; 122 size_t super_block_size; 123 124 /* Data block */ 125 uint32_t data_start, data_end; 126 127 /* Inode */ 128 struct bfs_inode *inode; 129 int n_inode; 130 int max_inode; 131 132 /* root directory */ 133 struct bfs_dirent *dirent; 134 size_t dirent_size; 135 int n_dirent; 136 int max_dirent; 137 struct bfs_inode *root_inode; 138 139 /* Sector I/O operation */ 140 struct sector_io_ops *io; 141 142 bool debug; 143 }; 144 145 struct sector_io_ops { 146 bool (*read)(void *, uint8_t *, daddr_t); 147 bool (*read_n)(void *, uint8_t *, daddr_t, int); 148 bool (*write)(void *, uint8_t *, daddr_t); 149 bool (*write_n)(void *, uint8_t *, daddr_t, int); 150 }; 151 152 int bfs_init2(struct bfs **, int, struct sector_io_ops *, bool); 153 void bfs_fini(struct bfs *); 154 int bfs_file_read(const struct bfs *, const char *, void *, size_t, size_t *); 155 int bfs_file_write(struct bfs *, const char *, void *, size_t); 156 int bfs_file_create(struct bfs *, const char *, void *, size_t, 157 const struct bfs_fileattr *); 158 int bfs_file_delete(struct bfs *, const char *); 159 int bfs_file_rename(struct bfs *, const char *, const char *); 160 bool bfs_file_lookup(const struct bfs *, const char *, int *, int *, 161 size_t *); 162 size_t bfs_file_size(const struct bfs_inode *); 163 bool bfs_dump(const struct bfs *); 164 165 /* filesystem ops */ 166 struct vnode; 167 int sysvbfs_bfs_init(struct bfs **, struct vnode *); 168 void sysvbfs_bfs_fini(struct bfs *); 169 bool bfs_inode_lookup(const struct bfs *, ino_t, struct bfs_inode **); 170 bool bfs_dirent_lookup_by_name(const struct bfs *, const char *, 171 struct bfs_dirent **); 172 bool bfs_dirent_lookup_by_inode(const struct bfs *, int, 173 struct bfs_dirent **); 174 void bfs_inode_set_attr(const struct bfs *, struct bfs_inode *, 175 const struct bfs_fileattr *attr); 176 int bfs_inode_alloc(const struct bfs *, struct bfs_inode **, int *, 177 int *); 178 #endif /* _KERNEL || _STANDALONE */ 179 #endif /* _FS_SYSVBFS_BFS_H_ */ 180
Indexes created Mon Sep 22 21:09:42 GMT 2025