80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
#pragma once
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#include "fs/vfs.h"
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#include "ext2_fs.h"
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namespace EXT2
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{
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class EXT2_FS;
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class EXT2_Inode: public VFS::Inode {
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public:
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class iterator {
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int block_index=0;
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// 块数计数器
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int index_cnt = 0;
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// buf0指向i->block
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// 三级分别页面缓存，各1k
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_u32 *block_buf[4] = {nullptr, nullptr, nullptr, nullptr};
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// 每个缓存块的真实块号
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_u32 block_pos[4] = {0, 0, 0, 0};
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// 在每个寻址级别下的最大可寻址块数
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// [12, 256+12, 256^2+256+12, 256^3+256^2+256+12]
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_u32 max_blocks[4];
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// 在每个缓存页面上的指针
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_u32 indexs[4] = {0, 0, 0, 0};
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// 索引等级，可取值0 1 2 3
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int level = 0;
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// 每个间接索引块含的间接索引数
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// [12, 256, 256, 256]
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_u32 sub_blocks_in_block[4];
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EXT2_Inode* inode;
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// 从磁盘加载块缓存
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// from可取0, 1, 2，表示加载从第几级间址开始加载
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void load_buf(int from=0);
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iterator(EXT2_Inode* i);
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public:
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static iterator getInstance(EXT2_Inode *i, _u32 blocks=0);
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~iterator();
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// ++a
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iterator& operator++();
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// a++
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const iterator& operator++(int);
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iterator& operator--();
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const iterator& operator--(int);
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bool operator==(const iterator& ano) const;
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bool operator!=(const iterator& ano) const;
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int operator*();
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friend class EXT2_Inode;
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};
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private:
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_u32 blocks;
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public:
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_u32 inode_n;
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EXT2::Inode* i;
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EXT2_FS *ext2_fs;
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EXT2_Inode(EXT2_FS*, _u32, EXT2::Inode*);
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void print();
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// 返回该文件的第b个字节所在块的块号
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_u32 byte_in_block(_u32 b);
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_u32 nth_block(_u32 n);
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void write_inode();
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iterator begin();
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iterator end();
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iterator iter_at(_u32 i);
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~EXT2_Inode();
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};
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} // namespace EXT2
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