🆕 vfs虚拟文件系统

kernel/filesystem/VFS/VFS.h

@@ -0,0 +1,136 @@
+/**
+ * @file VFS.h
+ * @author fslongjin (longjin@RinGoTek.cn)
+ * @brief 虚拟文件系统
+ * @version 0.1
+ * @date 2022-04-20
+ *
+ * @copyright Copyright (c) 2022
+ *
+ */
+
+#pragma once
+
+#include <common/glib.h>
+
+#define VFS_DPT_MBR 0 // MBR分区表
+#define VFS_DPT_GPT 1 // GPT分区表
+
+#define VFS_SUCCESS 0
+#define VFS_E_FS_EXISTED 1  // 错误：文件系统已存在
+#define VFS_E_FS_NOT_EXIST 2  // 错误：文件系统不存在
+
+struct vfs_super_block_operations_t;
+struct vfs_inode_operations_t;
+
+struct vfs_index_node_t;
+
+struct vfs_dir_entry_t
+{
+    char *name;
+    int name_length;
+    struct List child_node_list;
+    struct List subdirs_list;
+
+    struct vfs_index_node_t *dir_inode;
+    struct vfs_dir_entry_t *parent;
+    struct vfs_dir_entry_operatons_t *dir_ops;
+};
+
+struct vfs_superblock_t
+{
+    struct vfs_dir_entry_t *root;
+    struct vfs_super_block_operations_t *sb_ops;
+    void *private_sb_info;
+};
+
+struct vfs_index_node_t
+{
+    uint64_t file_size;
+    uint64_t blocks;
+    uint64_t attribute;
+
+    struct vfs_superblock_t *sb;
+    struct vfs_file_operations_t *file_ops;
+    struct vfs_inode_operations_t *inode_ops;
+
+    void *private_inode_info;
+};
+
+struct vfs_file_t
+{
+    long position;
+    uint64_t mode;
+
+    struct vfs_dir_entry_t *dEntry;
+    struct vfs_file_opeartions_t *file_ops;
+    void *private_data;
+};
+
+struct vfs_filesystem_type_t
+{
+    char *name;
+    int fs_flags;
+    struct vfs_superblock_t *(*read_superblock)(void *DPTE, uint8_t DPT_type, void *buf); // 解析文件系统引导扇区的函数，为文件系统创建超级块结构。其中DPTE为磁盘分区表entry（MBR、GPT不同）
+    struct vfs_filesystem_type_t *next;
+};
+
+struct vfs_super_block_operations_t
+{
+    void (*write_superblock)(struct vfs_superblock_t *sb);
+    void (*put_superblock)(struct vfs_superblock_t *sb);
+    void (*write_inode)(struct vfs_index_node_t *inode);
+};
+
+/**
+ * @brief 对vfs的inode的操作抽象
+ *
+ */
+struct vfs_inode_operations_t
+{
+    long (*create)(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dEntry, int mode);
+    struct vfs_dir_entry_t *(*lookup)(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_t *dest_dEntry);
+    long (*mkdir)(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dEntry, int mode);
+    long (*rmdir)(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dEntry);
+    long (*rename)(struct vfs_index_node_t *old_inode, struct vfs_dir_entry_t *old_dEntry, struct vfs_index_node_t *new_inode, struct vfs_dir_entry_t *new_dEntry);
+    long (*getAttr)(struct vfs_dir_entry_t *dEntry, uint64_t *attr);
+    long (*setAttr)(struct vfs_dir_entry_t *dEntry, uint64_t *attr);
+};
+
+struct vfs_dir_entry_operations_t
+{
+    long (*compare)(struct vfs_dir_entry_t *parent_dEntry, char *source_filename, char *dest_filename);
+    long (*hash)(struct vfs_dir_entry_t *dEntry, char *filename);
+    long (*release)(struct vfs_dir_entry_t *dEntry);
+    long (*iput)(struct vfs_dir_entry_t *dEntry, struct vfs_index_node_t *inode);
+};
+
+struct vfs_file_operations_t
+{
+    long (*open)(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr);
+    long (*close)(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr);
+    long (*read)(struct vfs_file_t *file_ptr, char *buf, uint64_t buf_size, long *position);
+    long (*write)(struct vfs_file_t *file_ptr, char *buf, uint64_t buf_size, long *position);
+    long (*lseek)(struct vfs_file_t *file_ptr, long offset, long origin);
+    long (*ioctl)(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr, uint64_t cmd, uint64_t arg);
+};
+
+/**
+ * @brief 在VFS中注册文件系统
+ * 
+ * @param fs 文件系统类型结构体
+ * @return uint64_t 
+ */
+uint64_t vfs_register_filesystem(struct vfs_filesystem_type_t *fs);
+uint64_t vfs_unregister_filesystem(struct vfs_filesystem_type_t *fs);
+
+/**
+ * @brief 挂载文件系统
+ *
+ * @param name 文件系统名
+ * @param DPTE 分区表entry
+ * @param DPT_type 分区表类型
+ * @param buf 缓存去
+ * @return struct vfs_superblock_t*
+ */
+struct vfs_superblock_t *vfs_mount_fs(char *name, void *DPTE, uint8_t DPT_type, void *buf);