Fix modification infomations. Reconstruct fs directory structure.

2024-02-02 18:21:04 +08:00
parent 6942ad6d1d
commit 7069f54ed9
60 changed files with 172144 additions and 65 deletions
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2020 AIIT XUOS Lab
+ * XiUOS is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *        http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#include "block_io.h"
+
+// memory file system memlayout.
+// [ block 0 ]  [  block 1  ]  [block 2] [...]  [  block 28  ]   [ ... ]
+// [ unused  ]  [super block]  [Inode bit map]  [block bit map]  [data blocks]
+
+#define NR_DIRECT_BLOCKS 5 // direct block number
+#define NR_INDIRECT_BLOCKS 8 // indirect block number
+#define ROOT_INUM 1 // root inode number
+
+#define MAX_INDIRECT_BLOCKS (BLOCK_SIZE / sizeof(uint32_t)) // Mmaximum number of indirect blocks mapped per block
+#define MAX_FILE_SIZE (NR_DIRECT_BLOCKS + (NR_INDIRECT_BLOCKS * MAX_INDIRECT_BLOCKS)) // maximum size of a file
+
+// memory fs range
+struct MemFsRange {
+    uintptr_t memfs_start;
+    uint32_t memfs_nr_blocks;
+};
+
+// current state of the Inode
+enum INODE_STATE {
+    I_RESERVED = 0,
+    I_BUSY,
+    I_VALID
+};
+
+// memfs file type
+enum FILE_TYPE {
+    T_RESERVED = 0,
+    T_DIR, // Directory
+    T_FILE, // File
+    T_DEV, // Device
+};
+
+// File system super block
+struct SuperBlock {
+    uint32_t size; // Number of total blocks of file system image
+    uint32_t nblocks; // Number of data blocks
+    uint32_t ninodes; // Number of inodes.
+};
+
+// state of the Inode
+struct State {
+    short type; // Type of file
+    int dev; // File system's disk device
+    uint32_t ino; // Inode number
+    short nlink; // Number of links to file
+    uint32_t size; // Size of file in bytes
+};
+
+// Inode structure
+struct Inode {
+    uint32_t inum; // Inode number
+    short type; // File type
+    short nlink; // Number of links to Inode in file system
+    uint32_t size; // Size of file (bytes)
+    uint32_t addrs[NR_DIRECT_BLOCKS + NR_INDIRECT_BLOCKS]; // Data block addresses
+};
+
+// directory entry
+#define DIR_NAME_SIZE 14
+struct DirectEntry {
+    uint16_t inum;
+    char name[DIR_NAME_SIZE];
+};
+
+// file descriptor definition
+#define MAX_PATH_LEN 128
+struct FileDescriptor {
+    char path[MAX_PATH_LEN];
+    void* data;
+    struct State st;
+};
+
+// range of memory fs
+extern struct MemFsRange MemFsRange;
+
+void MemFsInit(uintptr_t _binary_fs_img_start, uint32_t fs_img_len);
+void ReadSuperBlock(struct SuperBlock*);
+
+// fs Inode ops
+struct Inode* InodeGet(uint32_t inum);
+struct Inode* InodeCreate(struct Inode*, char*, short, short, short);
+int InodeDelete(struct Inode*, char*);
+int InodeRead(struct Inode*, char*, int, int);
+int InodeWrite(struct Inode*, char*, uint32_t, uint32_t);
+struct Inode* InodeSeek(struct Inode*, char*);
+struct Inode* InodeParentSeek(struct Inode*, char*, char*);
+
+// fs fd ops
+struct FileDescriptor* GetFileDescriptor(int fd);
+void FreeFileDescriptor(int fd);
+int AllocFileDescriptor(void);