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