207 lines
6.7 KiB
C++
207 lines
6.7 KiB
C++
#include "ext2_fs.h"
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#include "mm/buf.h"
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#include "delog/delog.h"
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#include "stat.h"
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#include "bits.h"
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#include <cstring>
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#include <iostream>
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#include <cmath>
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using namespace EXT2;
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EXT2_FS::EXT2_FS(Dev::BlockDevice* dev): FS(dev) {
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// mount();
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status = VFS::FS_unmounted;
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}
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void EXT2_FS::printFS() {
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using namespace std;
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cout << endl;
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cout << "文件系统中Inode数量 " << sb->inodes_count << endl;
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cout << "以块为单位的文件系统大小 " << sb->blocks_count << endl;
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cout << "文件系统中保留块数目 " << sb->r_blocks_count << endl;
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cout << "文件系统中空闲块数目 " << sb->free_blocks_count << endl;
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cout << "文件系统中空闲Inode数量 " << sb->free_inodes_count << endl;
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cout << "第一个使用的块号 " << sb->first_data_block << endl;
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cout << "块大小 " << block_size << endl;
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cout << "逻辑片大小 " << sb->log_frag_size << endl;
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cout << "每组块数 " << sb->blocks_per_group << endl;
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cout << "每组碎片数 " << sb->frags_per_group << endl;
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cout << "每组Inode数 " << sb->inodes_per_group << endl;
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cout << "上次挂载时间 " << sb->mtime << endl;
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cout << "上次写入超级块的时间 " << sb->wtime << endl;
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cout << "未进行检查的挂载次数 " << sb->mnt_count << endl;
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cout << "必须执行检查前的最大挂载次数 " << sb->max_mnt_count << endl;
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cout << "Magic " << sb->magic << endl;
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cout << "文件系统的状态 " << sb->state << endl;
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cout << "组描述符表：" << endl;
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for (EXT2_GD* gdt: gdt_list) {
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cout << "块位图块号 " << gdt->get_gd()->block_bitmap << endl;
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cout << "索引节点位图的块号 " << gdt->get_gd()->inode_bitmap << endl;
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cout << "第一个索引节点表块的块号 " << gdt->get_gd()->inode_table << endl;
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cout << "组中空闲块的个数 " << gdt->get_gd()->free_blocks_count << endl;
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cout << "组中空闲索引节点的个数 " << gdt->get_gd()->free_inodes_count << endl;
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cout << "组中目录的个数 " << gdt->get_gd()->used_dirs_count << endl;
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}
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}
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int EXT2_FS::block_to_pos(int block) {
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// _si(block);
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if (block == 0)
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return 1024;
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return (block - 1) * block_size + 1024;
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}
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int EXT2_FS::inode_to_pos(int inode_n) {
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inode_n--;
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int max_inodes_in_group = 8 * block_size;
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auto it = gdt_list.begin();
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while (it != gdt_list.end() && inode_n > max_inodes_in_group) {
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inode_n -= max_inodes_in_group;
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it++;
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}
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_error(it == gdt_list.end());
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_error(inode_n > max_inodes_in_group);
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return block_to_pos((*it)->get_gd()->inode_table) + inode_n * sizeof(Inode);
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}
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void EXT2_FS::mount() {
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sb = new SuperBlock();
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// dev->seek(1024); // 跳过引导块
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MM::Buf sb_buf(1024);
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dev->read(sb_buf, 1024, 1024); // 先读1k的超级块
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memmove(sb, sb_buf.data, 1024);
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magic = sb->magic;
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_sx(magic);
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// _si(sb->log_block_size);
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// _si(sb->blocks_count);
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// _si(sb->blocks_per_group);
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// 1024 * (1 << sb->log_block_size) * 8;
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block_size = 1024 * (1 << sb->log_block_size);
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// dev->seek(block_size + 1024); // 指向GDT
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_u32 read_pos = block_size + 1024;
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group_cnt = 8 * sb->blocks_count / sb->blocks_per_group;
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for (int i = 0; i < group_cnt; i++) {
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GroupDescriptor* gtp = new GroupDescriptor();
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dev->read(sb_buf, read_pos, sizeof(GroupDescriptor));
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memmove(gtp, sb_buf.data, sizeof(GroupDescriptor));
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gdt_list.push_back(new EXT2_GD(this, gtp, i));
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read_pos += sizeof(GroupDescriptor);
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}
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// 数据块位图
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// dev->seek());
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dev->read(sb_buf, block_to_pos(gdt_list.front()->get_gd()->inode_bitmap), block_size);
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// _sa(sb_buf.data, 1024);
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// 第一个索引节点 /
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// dev->seek(block_to_pos(gdt_list.front()->inode_table));
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// dev->read(sb_buf, sizeof(Inode));
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// dev->read(sb_buf, sizeof(Inode));
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// Inode* root_inode = new Inode();
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// memmove(root_inode, sb_buf.data, sizeof(Inode));
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_u32 root_inode_pos = gdt_list.front()->get_gd()->inode_table;
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EXT2_DEntry* ext2_entry = new EXT2_DEntry(this, nullptr, 2, VFS::Directory, "/");
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root = ext2_entry;
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// ext2_entry->inflate();
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// ext2_entry->load_children();
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// _sa(sb_buf.data, 1024);
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printFS();
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//printInode(ext2_entry->ext2_inode->i);
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status = VFS::FS_mounted;
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}
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_u32 EXT2_FS::alloc_inode(EXT2_GD **ret_gd) {
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_u32 inode_per_group = sb->inodes_count / group_cnt;
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int i = 0;
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for (EXT2_GD* gdd: gdt_list) {
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_u32 t = gdd->alloc_inode();
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if (t != 0) {
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// _si(t);
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sb->free_inodes_count--;
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if (ret_gd != nullptr)
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*ret_gd = gdd;
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return t + i * inode_per_group;
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}
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i++;
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}
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return 0;
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}
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_u32 EXT2_FS::alloc_block(EXT2_GD **ret_gd) {
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_u32 block_per_group = sb->blocks_count / group_cnt;
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int i = 0;
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for (EXT2_GD* gdd: gdt_list) {
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_u32 t = gdd->alloc_block();
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if (t != 0) {
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_si(t);
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sb->free_blocks_count--;
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if (ret_gd != nullptr)
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*ret_gd = gdd;
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return t + i * block_per_group;
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}
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}
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return 0;
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}
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void EXT2_FS::release_inode(_u32 inode_n, EXT2_GD **ret_gd) {
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_u32 inode_per_group = sb->inodes_count / group_cnt;
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_u32 which_group = inode_n / inode_per_group;
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_u32 inode_in_group = inode_n % inode_per_group;
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gdt_list[which_group]->release_inode(inode_in_group);
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sb->free_inodes_count++;
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}
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void EXT2_FS::release_block(_u32 block_n, EXT2_GD **ret_gd) {
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_u32 block_per_group = sb->blocks_count / group_cnt;
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_u32 which_group = block_n / block_per_group;
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_u32 block_in_group = block_n % block_per_group;
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gdt_list[which_group]->release_block(block_in_group);
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sb->free_blocks_count++;
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}
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void EXT2_FS::write_super() {
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_u32 super_pos = 1; // super block
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MM::Buf buf(sizeof(SuperBlock));
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memcpy(buf.data, sb, sizeof(SuperBlock));
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for (EXT2_GD *x: gdt_list) {
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dev->write(buf, block_to_pos(super_pos), sizeof(SuperBlock));
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super_pos += sb->blocks_per_group;
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}
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}
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void EXT2_FS::write_gdt() {
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_u32 super_pos = 2; // 第一个组描述符表位置
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MM::Buf buf(gdt_list.size() * sizeof(GroupDescriptor));
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_u32 s_pos = 0;
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_pos();
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for (EXT2_GD *x: gdt_list) {
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memcpy(buf.data + s_pos, x->get_gd(), sizeof(GroupDescriptor));
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s_pos += sizeof(GroupDescriptor);
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x->write_inode_bitmap();
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x->write_block_bitmap();
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}
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_pos();
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for (EXT2_GD *x: gdt_list) {
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dev->write(buf, block_to_pos(super_pos), sizeof(GroupDescriptor));
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super_pos += sb->blocks_per_group;
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}
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}
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EXT2_FS::~EXT2_FS() {
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for (auto x: gdt_list) {
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delete x;
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}
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delete sb;
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}
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