Initial commit

include/metadata.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include "simplefs.h"
+#include "simplefs_context.h"
+
+#include <cstdint>
+#include <vector>
+#include <string>
+
+// inode管理
+uint32_t alloc_inode(SimpleFS_Context& context, mode_t mode);
+void free_inode(SimpleFS_Context& context, uint32_t inode_num, mode_t mode_of_freed_inode);
+
+// 块管理
+uint32_t alloc_block(SimpleFS_Context& context, uint32_t preferred_group_for_inode = static_cast<uint32_t>(-1));
+void free_block(SimpleFS_Context& context, uint32_t block_num);
+
+// inode读写
+int write_inode_to_disk(SimpleFS_Context& context, uint32_t inode_num, const SimpleFS_Inode* inode_data);
+int read_inode_from_disk(SimpleFS_Context& context, uint32_t inode_num, SimpleFS_Inode* inode_struct);
+
+// 目录操作
+int add_dir_entry(SimpleFS_Context& context, SimpleFS_Inode* parent_inode, uint32_t parent_inode_num,
+                  const std::string& entry_name, uint32_t child_inode_num, uint8_t file_type);
+int remove_dir_entry(SimpleFS_Context& context, SimpleFS_Inode* parent_inode, uint32_t parent_inode_num, const std::string& entry_name_to_remove);
+
+// 路径解析
+void parse_path(const std::string& path, std::string& dirname, std::string& basename);
+
+// 位图操作
+void set_bitmap_bit(std::vector<uint8_t>& bitmap_data, uint32_t bit_index);
+void clear_bitmap_bit(std::vector<uint8_t>& bitmap_data, uint32_t bit_index);
+bool is_bitmap_bit_set(const std::vector<uint8_t>& bitmap_data, uint32_t bit_index);
+
+// 元数据同步
+void sync_fs_metadata(SimpleFS_Context& context);
+
+// 权限检查
+struct fuse_context;
+int check_access(const struct fuse_context* caller_context, const SimpleFS_Inode* inode, int requested_perm);
+
+// 块释放
+void free_all_inode_blocks(SimpleFS_Context& context, SimpleFS_Inode* inode);
+
+// 块映射
+uint32_t get_or_alloc_dir_block(SimpleFS_Context& context, SimpleFS_Inode* dir_inode, uint32_t dir_inode_num, uint32_t logical_block_idx);
+uint32_t map_logical_to_physical_block(SimpleFS_Context& context, const SimpleFS_Inode* inode, uint32_t logical_block_idx);
+void release_logical_block_range(SimpleFS_Context& context, SimpleFS_Inode* inode, uint32_t start_lbn, uint32_t end_lbn);