bfs.h revision 1.5.34.2
1 /* $NetBSD: bfs.h,v 1.5.34.2 2012/05/23 10:08:09 yamt 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 * 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 _FS_SYSVBFS_BFS_H_ 33 #define _FS_SYSVBFS_BFS_H_ 34 /* 35 * Boot File System 36 * 37 * +---------- 38 * |bfs_super_block (512byte) 39 * | 1 sector 40 * | 41 * +---------- 42 * |bfs_inode (64byte) * 8 43 * | . 1 sector 44 * |bfs_inode 45 * +---------- <--- bfs_super_block.header.data_start 46 * |DATA BLOCK 47 * | . 48 * | . 49 * | 50 * +---------- <--- bfs_super_block.header.data_end 51 */ 52 53 /* BFS specification */ 54 #define BFS_SECTOR 0 /* no offset */ 55 #define BFS_MAGIC 0x1badface 56 #define BFS_FILENAME_MAXLEN 14 57 #define BFS_ROOT_INODE 2 58 #define BFS_BSIZE 512 59 #define BFS_BSHIFT 9 60 61 struct bfs_super_block_header { 62 uint32_t magic; 63 uint32_t data_start_byte; 64 uint32_t data_end_byte; 65 } __packed; 66 67 struct bfs_compaction { 68 uint32_t from; 69 uint32_t to; 70 uint32_t from_backup; 71 uint32_t to_backup; 72 } __packed; 73 74 struct bfs_fileattr { 75 uint32_t type; 76 uint32_t mode; 77 int32_t uid; 78 int32_t gid; 79 uint32_t nlink; 80 int32_t atime; 81 int32_t mtime; 82 int32_t ctime; 83 int32_t padding[4]; 84 } __packed; /* 48byte */ 85 86 struct bfs_inode { 87 uint16_t number; /* 0 */ 88 int16_t padding; 89 uint32_t start_sector; /* 4 */ 90 uint32_t end_sector; /* 8 */ 91 uint32_t eof_offset_byte; /* 12 (offset from super block start) */ 92 struct bfs_fileattr attr; /* 16 */ 93 } __packed; /* 64byte */ 94 95 struct bfs_super_block { 96 struct bfs_super_block_header header; 97 struct bfs_compaction compaction; 98 char fsname[6]; 99 char volume[6]; 100 int32_t padding[118]; 101 } __packed; 102 103 struct bfs_dirent { 104 uint16_t inode; 105 char name[BFS_FILENAME_MAXLEN]; 106 } __packed; /* 16byte */ 107 108 #if defined _KERNEL || defined _STANDALONE 109 /* Software definition */ 110 struct sector_io_ops; 111 struct bfs { 112 int start_sector; 113 /* Super block */ 114 struct bfs_super_block *super_block; 115 size_t super_block_size; 116 117 /* Data block */ 118 uint32_t data_start, data_end; 119 120 /* Inode */ 121 struct bfs_inode *inode; 122 int n_inode; 123 int max_inode; 124 125 /* root directory */ 126 struct bfs_dirent *dirent; 127 size_t dirent_size; 128 int n_dirent; 129 int max_dirent; 130 struct bfs_inode *root_inode; 131 132 /* Sector I/O operation */ 133 struct sector_io_ops *io; 134 135 bool debug; 136 }; 137 138 struct sector_io_ops { 139 bool (*read)(void *, uint8_t *, daddr_t); 140 bool (*read_n)(void *, uint8_t *, daddr_t, int); 141 bool (*write)(void *, uint8_t *, daddr_t); 142 bool (*write_n)(void *, uint8_t *, daddr_t, int); 143 }; 144 145 struct vnode; 146 147 int bfs_init2(struct bfs **, int, struct sector_io_ops *, bool); 148 void bfs_fini(struct bfs *); 149 int bfs_file_read(const struct bfs *, const char *, void *, size_t, size_t *); 150 int bfs_file_write(struct bfs *, const char *, void *, size_t); 151 int bfs_file_create(struct bfs *, const char *, void *, size_t, 152 const struct bfs_fileattr *); 153 int bfs_file_delete(struct bfs *, const char *); 154 int bfs_file_rename(struct bfs *, const char *, const char *); 155 bool bfs_file_lookup(const struct bfs *, const char *, int *, int *, 156 size_t *); 157 size_t bfs_file_size(const struct bfs_inode *); 158 159 bool bfs_dump(const struct bfs *); 160 161 /* filesystem ops */ 162 int sysvbfs_bfs_init(struct bfs **, struct vnode *); 163 void sysvbfs_bfs_fini(struct bfs *); 164 bool bfs_inode_lookup(const struct bfs *, ino_t, struct bfs_inode **); 165 bool bfs_dirent_lookup_by_name(const struct bfs *, const char *, 166 struct bfs_dirent **); 167 bool bfs_dirent_lookup_by_inode(const struct bfs *, int, 168 struct bfs_dirent **); 169 void bfs_inode_set_attr(const struct bfs *, struct bfs_inode *, 170 const struct bfs_fileattr *attr); 171 int bfs_inode_alloc(const struct bfs *, struct bfs_inode **, int *, 172 int *); 173 #endif /* _KERNEL || _STANDALONE */ 174 #endif /* _FS_SYSVBFS_BFS_H_ */ 175
Indexes created Wed Oct 01 13:09:50 GMT 2025