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2025-11-06 10:49:44 +08:00
commit 2d16528ac4
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include/simplefs.h Normal file
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#pragma once
#include <cstdint>
#include <sys/types.h>
#pragma pack(push, 1)
// 文件系统常量定义
constexpr uint16_t SIMPLEFS_MAGIC = 0x5350;
constexpr uint32_t SIMPLEFS_BLOCK_SIZE = 4096;
constexpr uint32_t SIMPLEFS_ROOT_INODE_NUM = 2;
constexpr uint32_t SIMPLEFS_INODE_SIZE = 128;
constexpr uint32_t SIMPLEFS_NUM_DIRECT_BLOCKS = 12;
constexpr uint32_t SIMPLEFS_NUM_INDIRECT_BLOCKS = 1;
constexpr uint32_t SIMPLEFS_NUM_D_INDIRECT_BLOCKS = 1;
constexpr uint32_t SIMPLEFS_NUM_T_INDIRECT_BLOCKS = 1;
constexpr uint32_t SIMPLEFS_INODE_BLOCK_PTRS = SIMPLEFS_NUM_DIRECT_BLOCKS + \
SIMPLEFS_NUM_INDIRECT_BLOCKS + \
SIMPLEFS_NUM_D_INDIRECT_BLOCKS + \
SIMPLEFS_NUM_T_INDIRECT_BLOCKS;
constexpr uint32_t SIMPLEFS_MAX_FILENAME_LEN = 255;
// 文件类型常量
#ifndef S_IFMT
#define S_IFMT 0xF000 // 文件类型掩码
#define S_IFSOCK 0xC000 // 套接字
#define S_IFLNK 0xA000 // 符号链接
#define S_IFREG 0x8000 // 普通文件
#define S_IFBLK 0x6000 // 块设备
#define S_IFDIR 0x4000 // 目录
#define S_IFCHR 0x2000 // 字符设备
#define S_IFIFO 0x1000 // 管道
#endif
// 超级块结构
struct SimpleFS_SuperBlock {
uint16_t s_magic; // 魔数
uint32_t s_inodes_count; // 总inode数
uint32_t s_blocks_count; // 总块数
uint32_t s_free_blocks_count; // 空闲块数
uint32_t s_free_inodes_count; // 空闲inode数
uint32_t s_first_data_block; // 首个数据块
uint32_t s_log_block_size; // 块大小的对数值
uint32_t s_blocks_per_group; // 每组块数
uint32_t s_inodes_per_group; // 每组inode数
uint32_t s_mtime; // 最后挂载时间
uint32_t s_wtime; // 最后写入时间
uint16_t s_mnt_count; // 挂载次数
uint16_t s_max_mnt_count; // 最大挂载次数
uint16_t s_state; // 文件系统状态
uint16_t s_errors; // 错误处理方式
uint32_t s_first_ino; // 首个非保留inode号
uint16_t s_inode_size; // inode大小
uint16_t s_block_group_nr; // 块组号
uint32_t s_root_inode; // 根inode号
uint8_t s_padding[962]; // 填充到1024字节
};
static_assert(sizeof(SimpleFS_SuperBlock) == 1024, "超级块大小必须为1024字节");
// 块组描述符结构
struct SimpleFS_GroupDesc {
uint32_t bg_block_bitmap; // 块位图块号
uint32_t bg_inode_bitmap; // inode位图块号
uint32_t bg_inode_table; // inode表起始块号
uint16_t bg_free_blocks_count; // 空闲块数
uint16_t bg_free_inodes_count; // 空闲inode数
uint16_t bg_used_dirs_count; // 已使用目录数
uint8_t bg_padding[14]; // 填充到32字节
};
static_assert(sizeof(SimpleFS_GroupDesc) == 32, "块组描述符大小必须为32字节");
// inode结构
struct SimpleFS_Inode {
uint16_t i_mode; // 文件模式
uint16_t i_uid; // 用户ID
uint32_t i_size; // 文件大小
uint32_t i_atime; // 访问时间
uint32_t i_ctime; // 创建时间
uint32_t i_mtime; // 修改时间
uint32_t i_dtime; // 删除时间
uint16_t i_gid; // 组ID
uint16_t i_links_count; // 硬链接数
uint32_t i_blocks; // 块数
uint32_t i_flags; // 标志
uint32_t i_block[SIMPLEFS_INODE_BLOCK_PTRS]; // 块指针数组
uint8_t i_padding[32]; // 填充到128字节
};
static_assert(sizeof(SimpleFS_Inode) == 128, "inode大小必须为128字节");
// 目录项结构
struct SimpleFS_DirEntry {
uint32_t inode; // inode号
uint16_t rec_len; // 记录长度
uint8_t name_len; // 文件名长度
uint8_t file_type; // 文件类型
char name[SIMPLEFS_MAX_FILENAME_LEN + 1]; // 文件名
};
#pragma pack(pop)