176 lines
5.0 KiB
C
176 lines
5.0 KiB
C
/* $NetBSD: bfs.h,v 1.8 2014/01/09 13:23:57 hannken Exp $ */
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/*-
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* Copyright (c) 2004 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 _FS_SYSVBFS_BFS_H_
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#define _FS_SYSVBFS_BFS_H_
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/*
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* Boot File System
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*
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* +----------
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* |bfs_super_block (512byte)
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* | 1 sector
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* |
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* +----------
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* |bfs_inode (64byte) * 8
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* | . 1 sector
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* |bfs_inode
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* +---------- <--- bfs_super_block.header.data_start
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* |DATA BLOCK
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* | .
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* | .
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* |
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* +---------- <--- bfs_super_block.header.data_end
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*/
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/* BFS specification */
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#define BFS_SECTOR 0 /* no offset */
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#define BFS_MAGIC 0x1badface
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#define BFS_FILENAME_MAXLEN 14
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#define BFS_ROOT_INODE 2
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#define BFS_BSIZE 512
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#define BFS_BSHIFT 9
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struct bfs_super_block_header {
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uint32_t magic;
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uint32_t data_start_byte;
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uint32_t data_end_byte;
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} __packed;
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struct bfs_compaction {
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uint32_t from;
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uint32_t to;
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uint32_t from_backup;
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uint32_t to_backup;
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} __packed;
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struct bfs_fileattr {
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uint32_t type;
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uint32_t mode;
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int32_t uid;
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int32_t gid;
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uint32_t nlink;
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int32_t atime;
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int32_t mtime;
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int32_t ctime;
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int32_t padding[4];
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} __packed; /* 48byte */
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struct bfs_inode {
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uint16_t number; /* 0 */
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int16_t padding;
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uint32_t start_sector; /* 4 */
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uint32_t end_sector; /* 8 */
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uint32_t eof_offset_byte; /* 12 (offset from super block start) */
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struct bfs_fileattr attr; /* 16 */
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} __packed; /* 64byte */
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struct bfs_super_block {
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struct bfs_super_block_header header;
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struct bfs_compaction compaction;
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char fsname[6];
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char volume[6];
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int32_t padding[118];
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} __packed;
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struct bfs_dirent {
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uint16_t inode;
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char name[BFS_FILENAME_MAXLEN];
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} __packed; /* 16byte */
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#if defined _KERNEL || defined _STANDALONE
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/* Software definition */
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struct sector_io_ops;
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struct bfs {
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int start_sector;
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/* Super block */
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struct bfs_super_block *super_block;
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size_t super_block_size;
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/* Data block */
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uint32_t data_start, data_end;
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/* Inode */
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struct bfs_inode *inode;
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int n_inode;
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int max_inode;
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/* root directory */
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struct bfs_dirent *dirent;
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size_t dirent_size;
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int n_dirent;
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int max_dirent;
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struct bfs_inode *root_inode;
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/* Sector I/O operation */
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struct sector_io_ops *io;
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bool debug;
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};
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struct sector_io_ops {
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bool (*read)(void *, uint8_t *, daddr_t);
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bool (*read_n)(void *, uint8_t *, daddr_t, int);
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bool (*write)(void *, uint8_t *, daddr_t);
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bool (*write_n)(void *, uint8_t *, daddr_t, int);
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};
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struct vnode;
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int bfs_init2(struct bfs **, int, struct sector_io_ops *, bool);
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void bfs_fini(struct bfs *);
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int bfs_file_read(const struct bfs *, const char *, void *, size_t, size_t *);
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int bfs_file_write(struct bfs *, const char *, void *, size_t);
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int bfs_file_create(struct bfs *, const char *, void *, size_t,
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const struct bfs_fileattr *);
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int bfs_file_delete(struct bfs *, const char *, bool);
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int bfs_file_rename(struct bfs *, const char *, const char *);
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bool bfs_file_lookup(const struct bfs *, const char *, int *, int *,
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size_t *);
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size_t bfs_file_size(const struct bfs_inode *);
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bool bfs_dump(const struct bfs *);
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/* filesystem ops */
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int sysvbfs_bfs_init(struct bfs **, struct vnode *);
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void sysvbfs_bfs_fini(struct bfs *);
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bool bfs_inode_lookup(const struct bfs *, ino_t, struct bfs_inode **);
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int bfs_inode_delete(struct bfs *, ino_t);
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bool bfs_dirent_lookup_by_name(const struct bfs *, const char *,
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struct bfs_dirent **);
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bool bfs_dirent_lookup_by_inode(const struct bfs *, int,
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struct bfs_dirent **);
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void bfs_inode_set_attr(const struct bfs *, struct bfs_inode *,
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const struct bfs_fileattr *attr);
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int bfs_inode_alloc(const struct bfs *, struct bfs_inode **, int *,
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int *);
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#endif /* _KERNEL || _STANDALONE */
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#endif /* _FS_SYSVBFS_BFS_H_ */
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