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filesystem_controller.h
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executable file
·591 lines (479 loc) · 22.8 KB
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#ifndef FILESYSTEM_H
#define FILESYSTEM_H
#include <iostream>
#include <vector>
#include <algorithm>
#include <stdlib.h>
#include <math.h>
#include <cstdio>
#include "superblock.h"
#include "blockgroup_descriptor.h"
#include "inode_bitmap.h"
#include "inode.h"
#include "directoryentry.h"
typedef struct filesystem {
superblock* sb;
blockgroup_descriptor* bg_d;
dentry* d;
std::vector<uint32_t> free_blocks_list;
unsigned int partition_size;
filesystem();
filesystem(int sectors);
void format(FILE* device, int sectors);
void mount(FILE* device);
void listDirectory(FILE* device, uint32_t entry_inode, char* op);
void makedir(FILE* device, std::string token, uint32_t inode);
void makefile(FILE* device, std::string name, uint32_t entry_inode, uint32_t entry_offset, FILE* new_file);
void rmv(FILE* device, uint32_t inode, uint32_t parent_inode);
uint32_t findDentryDir(FILE* device, std::string name, uint32_t inode);
uint32_t findDentryFile(FILE* device, std::string name, uint32_t inode);
uint32_t seekFreeInode(FILE* device);
void writeFreeInodeBitmap(FILE* device, uint32_t index_inode);
void writeInodeBitmap(FILE* device, uint32_t index_inode);
void copy_file_HDtoFS(FILE* device, uint32_t dir_inode, std::string name_file, FILE* new_file);
uint32_t getBlockSize();
void updateFreeBlockList(FILE* device, uint32_t *x);
} filesystem;
filesystem::filesystem(){
this->sb = new superblock;
this->bg_d = new blockgroup_descriptor;
this->d = new dentry;
}
void filesystem::format(FILE* device, int sectors) { // FORMATAR DISPOSITIVO
superblock sb_format;
blockgroup_descriptor bg_d_format(sizeof(sb_format));
inode_bitmap ib_format;
inode i_format;
dentry de_format[2];
sb_format.s_blocks_count = ceil((double)((sectors*512)/sb_format.s_block_size));
sb_format.s_inodes_count = ceil((double)((sectors*512)/sb_format.s_block_size)/10);
sb_format.s_free_blocks_count = sb_format.s_blocks_count;
sb_format.s_free_inodes_count = sb_format.s_inodes_count;
rewind(device);
sb_format.writeFile(device);
bg_d_format.writeFile(device);
ib_format.writeFile(device);
for(int i = 0; i < sb_format.s_inodes_count; i++){
i_format.writeFile(device);
}
// Adiciona a lista (free_blocks_list) os BLOCOS LIVRES.
for(int i = 0; i < (((sectors*512)-bg_d_format.bgd_data_blocks)/sb_format.s_block_size); i++) {
if(i == 0) {
free_blocks_list.push_back(bg_d_format.bgd_addr_first_free_block);
} else {
free_blocks_list.push_back(bg_d_format.bgd_addr_first_free_block + (i * 1024));
}
}
// Escreve no Dispositivo (device), para criar uma
// LISTA LIGADA DE BLOCOS LIVRES
uint32_t *x = free_blocks_list.data();
for(int i = 0; i < free_blocks_list.size(); i++){
std::fseek(device, free_blocks_list.at(i), SEEK_SET);
std::fwrite(x+(i+1), sizeof(uint32_t), 1, device);
if(i == (free_blocks_list.size() - 1)){
std::fseek(device, free_blocks_list.at(i)+1020, SEEK_SET);
std::fwrite(x+(i+1), sizeof(uint32_t), 1, device);
}
}
uint32_t last_mask = 0xFFFFFFFF; // Mascara para escrever no ultimo bloco livre 0xFFFF
fseek(device, free_blocks_list.at(free_blocks_list.size() - 1), SEEK_SET);
std::fwrite(&last_mask, sizeof(uint32_t), 1, device);
// Cria as entradas primárias do ROOT "." e ".."
i_format.i_type = 2;
i_format.i_block[0] = bg_d_format.bgd_data_blocks;
i_format.i_size = 0;
std::fseek(device, bg_d_format.bgd_inode_table, SEEK_SET);
std::fwrite(&i_format, sizeof(inode), 1, device);
de_format[0].inode = 0;
de_format[0].setName(".");
de_format[0].name_len = sizeof(de_format[0].file_name);
de_format[0].file_type = 2;
de_format[0].entry_len = sizeof(de_format[0]);
de_format[1].inode = 0;
de_format[1].setName("..");
de_format[1].name_len = sizeof(de_format[1].file_name);
de_format[1].file_type = 2;
de_format[1].entry_len = sizeof(de_format[1]);
std::fseek(device, bg_d_format.bgd_data_blocks, SEEK_SET);
std::fwrite(de_format, sizeof(dentry), 2, device);
uint8_t byte = 1 << 7;
std:fseek(device, bg_d_format.bgd_inode_bitmap, SEEK_SET);
std::fwrite(&byte, sizeof(uint8_t), 1, device);
// Atualiza a LISTA DE BLOCOS LIVRES, retirando o BLOCO alocado para o ROOT
free_blocks_list.erase(free_blocks_list.begin());
x = free_blocks_list.data();
bg_d_format.bgd_addr_first_free_block = free_blocks_list[0];
updateFreeBlockList(device, x);
}
void filesystem::mount(FILE* device){ // MONTAR DISPOSITIVO
// Faz a leitura do Dispositivo, carregando a informações
// necessárias para futuras operações.
fread(sb, sizeof(superblock), 1, device);
fread(bg_d, sizeof(blockgroup_descriptor), 1, device);
uint32_t free_block;
free_blocks_list.push_back(bg_d->bgd_addr_first_free_block);
fseek(device, bg_d->bgd_addr_first_free_block, SEEK_SET);
while(free_block != 0xFFFFFFFF) {
fread(&free_block, sizeof(uint32_t), 1, device);
if(free_block == 0x00000000 || free_block == 0xFFFFFFFF){
free_block = 0xFFFFFFFF;
}else{
free_blocks_list.push_back(free_block);
fseek(device, free_block, SEEK_SET);
}
}
}
void filesystem::listDirectory(FILE* device, uint32_t entry_inode, char* op){ // LISTAR DIRETÓRIOS/ARQUIVOS
// Aponta na INODE TABLE onde está o respectivo inode e seus ponteiros.
uint32_t inode_position;
fseek(device, (this->bg_d->bgd_inode_table + (entry_inode * 64) + 5), SEEK_SET);
fread(&inode_position, sizeof(uint32_t), 1, device);
fseek(device, inode_position, SEEK_SET);
for(int index_entry = 0; index_entry < this->sb->s_block_size; index_entry+=32){
dentry entry;
fread(&entry, sizeof(dentry), 1, device);
if(entry.file_name[0] == 0){
std::cout << std::endl;
return;
}else if (entry.file_type == 0x02){
printf("\x1b[32m %25s \x1b[0m", entry.file_name); //diretorio verde
}else if(entry.file_type == 0x01){
printf("\x1b[33m %25s \x1b[0m", entry.file_name); // arquivo amarelo
}
}
std::cout << std::endl;
}
void filesystem::makedir(FILE* device, std::string name, uint32_t entry_inode) { // CRIAR DIRETÓRIOS
// Encontrar um Inode livre no InodeBitmap
uint32_t free_inode = seekFreeInode(device);
// Ir na InodeTable e escrever o respectivo Inode
fseek(device, bg_d->bgd_inode_table + (free_inode * 64), SEEK_SET);
inode new_inode;
new_inode.i_type = 2;
new_inode.i_size = 0;
new_inode.i_block[0] = free_blocks_list[0];
fwrite(&new_inode, sizeof(inode), 1, device);
// Apagar o ex Bloco livre da lista de blocos livres (free_list_blocks)
uint32_t *x = free_blocks_list.data();
free_blocks_list.erase(free_blocks_list.begin());
x = free_blocks_list.data();
bg_d->bgd_addr_first_free_block = free_blocks_list[0];
updateFreeBlockList(device, x);
// Configurando as entradas
// Escreve no Root
dentry new_entry[3];
new_entry[0].inode = free_inode;
new_entry[0].entry_len = sizeof(dentry);
new_entry[0].name_len = sizeof(new_entry[0].file_name);
new_entry[0].file_type = 2;
new_entry[0].setName(name);
// Escreve no Bloco do i_block do novo dir {
new_entry[1].inode = free_inode;
new_entry[1].entry_len = sizeof(dentry);
new_entry[1].name_len = sizeof(new_entry[0].file_name);
new_entry[1].file_type = 2;
new_entry[1].setName(".");
new_entry[2].inode = entry_inode;
new_entry[2].entry_len = sizeof(dentry);
new_entry[2].name_len = sizeof(new_entry[0].file_name);
new_entry[2].file_type = 2;
new_entry[2].setName("..");
// }
std::fseek(device, new_inode.i_block[0], SEEK_SET);
fwrite(&new_entry[1], sizeof(dentry), 1, device);
fwrite(&new_entry[2], sizeof(dentry), 1, device);
fseek(device, bg_d->bgd_inode_table + (entry_inode * 64) + 5, SEEK_SET);
uint32_t addr_entry;
fread(&addr_entry, sizeof(uint32_t), 1, device);
fseek(device, addr_entry, SEEK_SET);
for(int index_entry = 0; index_entry < this->sb->s_block_size; index_entry+=32) {
dentry entry;
// Procurar nas entradas do ROOT um Diretorio de mesmo nome
fread(&entry, sizeof(dentry), 1, device);
int flag = 0, j = 0;
for(j = 0; j < 24; j++) {
if(entry.file_name[j] != 0 && (entry.file_type != 0xE5)) {
flag = 1;
break;
}
}
if(flag == 0 && j == 24){
addr_entry += index_entry;
break;
}
}
fseek(device, addr_entry, SEEK_SET);
fwrite(&new_entry[0], sizeof(dentry), 1, device);
writeInodeBitmap(device, free_inode);
}
void filesystem::makefile(FILE* device, std::string name, uint32_t entry_inode, uint32_t entry_offset, FILE* new_file){
}
void filesystem::rmv(FILE* device, uint32_t entry_inode, uint32_t parent_inode) {
/* RESUMO DE PASSOS >>
-------------------------------------------------------------------------------------------------------------------------------------------------------
1 - Cria uma lista/pilha e coloca o Número do INODE do Diretório/Arquivo a ser Excluido
2 - Procura na Inode Table a informação referente ao Tipo de Entrada do Inode existente na LISTA DE INODES
2.1 - Se for Arquivo apenas continua para o proximo inode da LISTA
2.2 - Senão se for Diretório, ir até os Ponteiros de Data Block, e ler as Entradas de Cada DATA BLOCK daquele Diretorio
3 - Para cada entrada do diretório, colocar na pilha os inodes referentes a cada entrada;
4 - Anda na lista, para o próximo Inode, repete o processo até que se chegue ao fim da lista, ou seja, nao tenha mais entradas para ler (DEEP SEARCH)
5 - Nesse estado teremos uma pilha com todos os INODES, a partir disso começar a desempilhar
6 - Para cada inode, deve-se:
6.1 - Escrever 0xE5 nas entradas dos Data Blocks, para delimitar entrada/arquivo excluido;
6.2 - Adicionar a Lista de Blocos Livres os Blocos Apontados pelo Inode;
6.3 - Atualizar Inode_Bitmap com os inodes agora livres;
6.4 - Zerar Inodes
--------------------------------------------------------------------------------------------------------------------------------------------------------
*/
uint8_t inode_type;
uint32_t i_block_position[OWNFS_I_BLOCK_POINTERS];
std::cout << "PARENT INODE= " << (unsigned)parent_inode << std::endl;
// 1
std::vector<uint32_t> deep_search_vector;
deep_search_vector.push_back(entry_inode);
for (int i = 0; i < deep_search_vector.size(); i++){
inode current_inode;
uint32_t current_inode_number = deep_search_vector.at(i);
// 2
fseek(device, (this->bg_d->bgd_inode_table + (current_inode_number * 64)), SEEK_SET);
fread(¤t_inode, sizeof(inode), 1, device);
// 2.1
if(current_inode.i_type == 0x01){
// É arquivo, portanto apenas continuar para excluir.
continue;
//2.2
}else if(current_inode.i_type == 0x02){
// 3 - Como é diretório deve-se salvar todas as suas entradas antes de ir para o próximo
// 12 ponteiros direto para BLOCOS, portanto deve-se conferir todos
for(int block_pointer = 0; block_pointer < 12; block_pointer++){
// Se for "NULL" é porque nao esta sendo usado, então para
if(current_inode.i_block[block_pointer] == 0x00000000){
break;
}
// Pular "." e ".."
fseek(device, current_inode.i_block[block_pointer] + 64, SEEK_SET);
// Ler entrada por entrada, jogando os INODES dela no VECTOR
for(int index_entry = 64; index_entry < this->sb->s_block_size; index_entry+=32) {
dentry entry;
fread(&entry, sizeof(dentry), 1, device);
//Se inode = 0 é porque não possui entrada
if(entry.inode == 0x00000000 && entry.file_type == 0x00){
break;
}else{
deep_search_vector.push_back(entry.inode);
}
}
}
}else{
std::cout << "ERROR MESSAGE (RMV FUNCTION :: LINE 323): CORRUPTED FILE " << std::endl;
exit(-1);
}
}
// 5 - VECTOR é a lista (deep_search) com todos os inodes que devem ser apagados
for(int i = deep_search_vector.size(); i != 0; i--){
inode deleted_inode;
inode inode_parent;
uint8_t filetype_mask = 0xE5;
uint32_t deleted_inode_number = deep_search_vector.back();
uint32_t inode_parent_number;
if(deleted_inode_number == 0x00000000){
break;
}
fseek(device, (this->bg_d->bgd_inode_table + (deleted_inode_number * 64)), SEEK_SET);
fread(&deleted_inode, sizeof(inode), 1, device);
// Se for arquivo, apenas apagar os inodes e liberar os Blocos, não precisa Escrever 0xE5
// Se for diretorio, é preciso escrever 0xE5 nas entradas antes de apagar
if(deleted_inode.i_type == 0x01){ //ARQUIVO
for(int current_pointer = 0; current_pointer < 12; current_pointer++){
if(deleted_inode.i_block[current_pointer] == 0x00000000){
break;
}
// ADICIONA NOVO BLOCO LIVRE A LISTA DE LIVRES
free_blocks_list.push_back(deleted_inode.i_block[current_pointer]);
}
writeFreeInodeBitmap(device, deep_search_vector.at(deep_search_vector.size() - 1));
deep_search_vector.pop_back();
// 2 - É preciso apagar as entradas dos diretorios que contem o diretorio apagado
inode_parent_number = parent_inode;
fseek(device, (this->bg_d->bgd_inode_table + (inode_parent_number * 64)), SEEK_SET);
fread(&inode_parent, sizeof(inode), 1, device);
for(int current_pointer = 0; current_pointer < 12; current_pointer++){
if(inode_parent.i_block[current_pointer] == 0x00000000){
break;
}
for(int index_entry = 0; index_entry < this->sb->s_block_size; index_entry+=32) {
dentry entry;
fseek(device, inode_parent.i_block[current_pointer] + index_entry, SEEK_SET);
fread(&entry, sizeof(dentry), 1, device);
if(entry.inode == 0x00000000 && entry.file_type == 0x00){
break;
}else if(entry.inode == deleted_inode_number){
fseek(device, inode_parent.i_block[current_pointer] + (index_entry + 7), SEEK_SET);
fwrite(&filetype_mask, sizeof(uint8_t), 1, device);
}else{
continue;
}
}
}
}else if(deleted_inode.i_type == 0x02){ //DIRETORIO
// 1 - Escrever E5 em todas as entradas do diretorio a ser excluido
for(int current_pointer = 0; current_pointer < 12; current_pointer++){
if(deleted_inode.i_block[current_pointer] == 0x00000000){
break;
}
for(int index_entry = 0; index_entry < this->sb->s_block_size; index_entry+=32) {
dentry entry;
fseek(device, deleted_inode.i_block[current_pointer] + index_entry, SEEK_SET);
fread(&entry, sizeof(dentry), 1, device);
if(entry.inode == 0x00000000 && entry.file_type == 0x00){
break;
}else{
fseek(device, deleted_inode.i_block[current_pointer] + (index_entry + 7), SEEK_SET);
fwrite(&filetype_mask, sizeof(uint8_t), 1, device);
}
}
// ADICIONA NOVO BLOCO LIVRE A LISTA DE LIVRES
free_blocks_list.push_back(deleted_inode.i_block[current_pointer]);
}
///////////////////////////////////////////////////////////////////////
// 2 - É preciso apagar as entradas dos diretorios que contem o diretorio apagado
fseek(device, (deleted_inode.i_block[0] + 32), SEEK_SET);
fread(&inode_parent_number, sizeof(uint32_t), 1,device);
fseek(device, (this->bg_d->bgd_inode_table + (inode_parent_number * 64)), SEEK_SET);
fread(&inode_parent, sizeof(inode), 1, device);
for(int current_pointer = 0; current_pointer < 12; current_pointer++){
if(inode_parent.i_block[current_pointer] == 0x00000000){
break;
}
for(int index_entry = 0; index_entry < this->sb->s_block_size; index_entry+=32) {
dentry entry;
fseek(device, inode_parent.i_block[current_pointer] + index_entry, SEEK_SET);
fread(&entry, sizeof(dentry), 1, device);
if(entry.inode == 0x00000000 && entry.file_type == 0x00){
break;
}else if(entry.inode == deleted_inode_number){
fseek(device, inode_parent.i_block[current_pointer] + (index_entry + 7), SEEK_SET);
fwrite(&filetype_mask, sizeof(uint8_t), 1, device);
}else{
continue;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////
// Liberar os INODES
writeFreeInodeBitmap(device, deep_search_vector.at(deep_search_vector.size() - 1));
deep_search_vector.pop_back();
}
}
// Atualiza Blocos Livres
uint32_t *x = free_blocks_list.data();
updateFreeBlockList(device, x);
}
uint32_t filesystem::findDentryDir(FILE* device, std::string name, uint32_t inode) { // Busca por diretórios e Retorna seu INODE
if(name.size() > 24)
std::cout << "ERROR: Name greater than " << name.size() + 1 << " characters!" << std::endl;
uint32_t inode_position;
//Posiciona no arquivo o local onde esta as Entradas para o inode
fseek(device, (this->bg_d->bgd_inode_table + (inode * 64) + 5), SEEK_SET);
fread(&inode_position, sizeof(uint32_t), 1, device);
fseek(device, inode_position, SEEK_SET);
for(int index_entry = 0; index_entry < this->sb->s_block_size; index_entry+=32) {
dentry entry;
fread(&entry, sizeof(dentry), 1, device);
int j = 0, flag = 0;
for(j = 0; (j < name.size() && j < 24); j++) {
if(entry.file_name[j] != name[j]) {
flag = 1;
break;
}
}
if(!flag && (j == 24 || entry.file_name[j] == 0) && entry.file_type == 0x02) {
return entry.inode;
}
}
return -1;
}
uint32_t filesystem::findDentryFile(FILE* device, std::string name, uint32_t inode){ // Busca por arquivos e Retorna seu INODE
if(name.size() > 24)
std::cout << "ERROR: Name greater than " << name.size() + 1 << " characters!" << std::endl;
uint32_t inode_position;
//Posiciona no arquivo o local onde esta as Entradas para o inode
fseek(device, (this->bg_d->bgd_inode_table + (inode * 64) + 5), SEEK_SET);
fread(&inode_position, sizeof(uint32_t), 1, device);
fseek(device, inode_position, SEEK_SET);
for(int index_entry = 0; index_entry < this->sb->s_block_size; index_entry+=32) {
dentry entry;
fread(&entry, sizeof(dentry), 1, device);
int j = 0, flag = 0;
for(j = 0; (j < name.size() && j < 24); j++) {
if(entry.file_name[j] != name[j]) {
flag = 1;
break;
}
}
if(!flag && (j == 24 || entry.file_name[j] == 0) && entry.file_type == 0x01) {
return entry.inode;
}
}
return -1;
}
uint32_t filesystem::seekFreeInode(FILE* device) { // Busca por INODES LIVRES em INODE BITMAP
uint8_t mask = 0xFF;
uint8_t byte = 0x00;
fseek(device, bg_d->bgd_inode_bitmap, SEEK_SET);
for(uint32_t i = bg_d->bgd_inode_bitmap; i < sizeof(inode_bitmap); i++) {
fread(&byte, sizeof(uint8_t), 1, device);
uint8_t free = (byte ^ mask);
if(!free) {
continue;
}
for(uint8_t s = 0; s < 8; s++) {
if((free << s) & 0x80) {
return ((s + 1) + (8 * (i - bg_d->bgd_inode_bitmap)))-1;
}
}
}
return -1;
}
void filesystem::writeFreeInodeBitmap(FILE* device, uint32_t index_inode) { // Escreve INODES LIVRES em INODE BITMAP
uint32_t offset = index_inode / 8;
uint32_t shift = index_inode % 8;
uint8_t mask = 0x80;
uint8_t entry = 0x00;
fseek(device, bg_d->bgd_inode_bitmap + offset, SEEK_SET);
fread(&entry, sizeof(uint8_t), 1, device);
entry ^= mask >> shift;
fseek(device, bg_d->bgd_inode_bitmap + offset, SEEK_SET);
fwrite(&entry, sizeof(uint8_t), 1, device);
}
void filesystem::writeInodeBitmap(FILE* device, uint32_t index_inode) { // Escreve INODES OCUPADOS em INODE BITMAP
uint32_t offset = index_inode / 8;
uint32_t shift = index_inode % 8;
uint8_t mask = 0x80;
uint8_t entry = 0x00;
fseek(device, bg_d->bgd_inode_bitmap + offset, SEEK_SET);
fread(&entry, sizeof(uint8_t), 1, device);
entry |= mask >> shift;
fseek(device, bg_d->bgd_inode_bitmap + offset, SEEK_SET);
fwrite(&entry, sizeof(uint8_t), 1, device);
}
void filesystem::copy_file_HDtoFS(FILE* device, uint32_t dir_inode, std::string name_file, FILE* new_file){ // Copia do HD para o FS // NaF
//FUNÇÀO SEM FUNCIONALIDADE
}
uint32_t filesystem::getBlockSize(){ // Retorna o tamanho do BLOCO == 1024
return sb->s_block_size;
}
void filesystem::updateFreeBlockList(FILE* device, uint32_t *x){ // Atualiza a Lista de Blocos Livres
uint32_t last_mask = 0xFFFFFFFF;
// Altera o primeiro Bloco livre no Block Groups Descriptor
std::fseek(device, sizeof(superblock) + 12, SEEK_SET );
std::fwrite(x, sizeof(uint32_t), 1, device);
//Reescreve na imagem a lista ligada de blocos livres
for(int i = 0; i < free_blocks_list.size() - 1; i++){
std::fseek(device, free_blocks_list.at(i), SEEK_SET);
std::fwrite(x+(i+1), sizeof(uint32_t), 1, device);
}
std::fseek(device, free_blocks_list.at(free_blocks_list.size()-1), SEEK_SET);
std::fwrite(&last_mask, sizeof(uint32_t), 1, device);
}
#endif // FILESYSTEM