901 lines
31 KiB
C++
901 lines
31 KiB
C++
//#include "fuse.h" add this when layer3
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#define FUSE_USE_VERSION 31
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#include "files.h"
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#include <cassert>
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#include <sstream>
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#include <string.h>
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struct DirectoryEntry {
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u_int64_t inode_number;
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char file_name[256];
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void serialize(char *buffer) {
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u_int64_t t = inode_number;
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for (int j = 0; j < 8; j++) {
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buffer[j] = t & (((u_int64_t)1 << (8)) - 1);
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t >>= 8;
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}
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strcpy(buffer + 8, file_name);
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}
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void deserialize(char *buffer) {
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inode_number = 0;
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for (int j = 0; j < 8; j++)
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inode_number =
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inode_number | (((u_int64_t)(unsigned char)buffer[j]) << (8 * j));
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strcpy(file_name, buffer + 8);
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}
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};
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void FilesOperation::printbuffer(const char *buff, int len) {
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for (int i = 0; i < len; i++) {
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printf("%x ", buff[i]);
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}
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printf("\n");
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}
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FilesOperation::FilesOperation(RawDisk &disk_, Fs *fs) : disk(disk_) {
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this->fs = fs;
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}
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void FilesOperation::create_dot_dotdot(INode_Data *inode,
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u_int64_t parent_inode_number) {
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char buffer[IO_BLOCK_SIZE] = {0};
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DirectoryEntry dot;
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dot.inode_number = inode->inode_num;
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strcpy(dot.file_name, ".");
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dot.serialize(buffer);
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DirectoryEntry dotdot;
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dotdot.inode_number = parent_inode_number;
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strcpy(dotdot.file_name, "..");
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dotdot.serialize(buffer + 264);
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int ret = fs->write(inode, buffer, IO_BLOCK_SIZE, 0);
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// printf("in create_dot_dotdot: fs->write returned %d\n",ret);
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}
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void FilesOperation::initialize_rootinode() {
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// this method must be called explicitly right after initializion
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INode_Data *root_inode = new INode_Data();
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fs->inode_manager->new_inode(0, 0, S_IFDIR, root_inode);
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u_int64_t root_inode_number = root_inode->inode_num;
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create_dot_dotdot(root_inode, root_inode_number);
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root_node = fischl_init_entry(root_inode_number, "/", root_inode);
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assert(root_node->self_info != NULL);
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fs->inode_manager->save_inode(root_inode);
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}
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void FilesOperation::printDirectory(u_int64_t inode_number) {
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INode_Data inode;
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inode.inode_num = inode_number;
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fs->inode_manager->load_inode(&inode);
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char buffer[IO_BLOCK_SIZE] = {0};
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for (u_int64_t idx = 0; idx < inode.metadata.size / IO_BLOCK_SIZE; idx++) {
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fs->read(&inode, buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
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DirectoryEntry ent;
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for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
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ent.deserialize(buffer + i);
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if (ent.inode_number)
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printf("%s\t%llu;\t", ent.file_name, ent.inode_number);
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}
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}
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printf("\n");
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}
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INode_Data *FilesOperation::create_new_inode(u_int64_t parent_inode_number,
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const char *name, mode_t mode) {
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// trys to create a file under parent directory
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if (strlen(name) >= 256) {
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perror("Name too long, cannot create file or directory");
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return NULL;
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}
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INode_Data inode;
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inode.inode_num = parent_inode_number;
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fs->inode_manager->load_inode(&inode);
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if ((inode.metadata.permissions & S_IFMT) != S_IFDIR) {
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fprintf(stderr, "[%s ,%d] please create under directory\n", __func__,
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__LINE__);
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return NULL;
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}
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// Check if file or directory already exists
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char r_buffer[IO_BLOCK_SIZE] = {0};
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for (u_int64_t idx = 0; idx < inode.metadata.size / IO_BLOCK_SIZE; idx++) {
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fs->read(&inode, r_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
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DirectoryEntry ent;
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for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
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ent.deserialize(r_buffer + i);
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if (strcmp(ent.file_name, name) == 0 && ent.inode_number != 0) {
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if ((mode & S_IFMT) == S_IFDIR) {
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fprintf(stderr, "[%s ,%d] %s/ already exists\n", __func__, __LINE__,
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name);
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} else {
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fprintf(stderr, "[%s ,%d] %s already exists\n", __func__, __LINE__,
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name);
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}
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return NULL;
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}
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}
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}
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bool allocated = false;
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INode_Data *new_inode = new INode_Data();
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fs->inode_manager->new_inode(0, 0, mode, new_inode);
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if ((mode & S_IFMT) == S_IFDIR) {
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create_dot_dotdot(new_inode, parent_inode_number);
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fs->inode_manager->save_inode(new_inode);
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}
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char rw_buffer[IO_BLOCK_SIZE] = {0};
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for (u_int64_t idx = 0; idx < inode.metadata.size / IO_BLOCK_SIZE; idx++) {
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fs->read(&inode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
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DirectoryEntry ent;
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for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
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ent.deserialize(rw_buffer + i);
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if (ent.inode_number == 0) {
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allocated = true;
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ent.inode_number = new_inode->inode_num;
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strcpy(ent.file_name, name);
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ent.serialize(rw_buffer + i);
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break;
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}
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}
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if (allocated) {
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fs->write(&inode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
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break;
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}
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}
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if (!allocated) {
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char write_buffer[IO_BLOCK_SIZE] = {0};
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DirectoryEntry ent;
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ent.inode_number = new_inode->inode_num;
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strcpy(ent.file_name, name);
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ent.serialize(write_buffer);
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fs->write(&inode, write_buffer, IO_BLOCK_SIZE,
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(inode.metadata.size / IO_BLOCK_SIZE) * IO_BLOCK_SIZE);
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fs->inode_manager->save_inode(&inode);
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}
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return new_inode;
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}
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u_int64_t FilesOperation::disk_namei(const char *path) {
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// returns the inode number corresponding to path
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u_int64_t current_inode = root_node->self_info->inode_number;
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std::string current_dirname;
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std::istringstream pathStream(path);
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std::string new_name;
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std::getline(pathStream, new_name, '/');
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if (!new_name.empty()) {
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printf("disk_namei: path should start with /\n");
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return -1;
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}
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while (std::getline(pathStream, new_name, '/')) {
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INode_Data inode;
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inode.inode_num = current_inode;
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fs->inode_manager->load_inode(&inode);
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if ((inode.metadata.permissions & S_IFMT) != S_IFDIR ||
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inode.metadata.size == 0) {
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printf("disk_namei: %s is not a non-empty directory\n",
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current_dirname.c_str());
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return -1;
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}
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u_int64_t new_inode_number = 0;
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char buffer[IO_BLOCK_SIZE] = {0};
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for (u_int64_t idx = 0; idx < inode.metadata.size / IO_BLOCK_SIZE; idx++) {
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fs->read(&inode, buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
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DirectoryEntry ent;
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for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
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ent.deserialize(buffer + i);
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if (strcmp(ent.file_name, new_name.c_str()) == 0) {
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new_inode_number = ent.inode_number;
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break;
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}
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}
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if (new_inode_number)
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break;
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}
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if (!new_inode_number) {
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printf("disk_namei: no name matching %s under directory %s\n",
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new_name.c_str(), current_dirname.c_str());
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return -1;
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}
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current_inode = new_inode_number;
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current_dirname = new_name;
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}
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return current_inode;
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// path = "/" should return root_inode_number
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// (root_node->self_info->inode_number) path = "/foo.txt" should return inode
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// for foo.txt path = "/mydir" should return inode for mydir path =
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// "/nonemptydir/foo" should return inode for foo path = "/notnonemptydir/foo"
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// should raise error
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}
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u_int64_t FilesOperation::namei(const char *path) {
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FileNode *filenode = fischl_find_entry(root_node, path);
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if (filenode)
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return filenode->inode_number;
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else
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return -1;
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}
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int FilesOperation::fischl_mkdir(const char *path, mode_t mode) {
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// check path
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char *pathdup = strdup(path);
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char *lastSlash = strrchr(pathdup, '/');
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*lastSlash = '\0'; // Split the string into parent path and new directory
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// name; <parent path>\0<direcotry name>
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char *newDirname =
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lastSlash + 1; //\0<direcotry name>, get from <direcotry name>
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char *ParentPath = pathdup; // pathdup are separated by pathdup, so it take
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// <parent path> only
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FileNode *parent_filenode = strlen(ParentPath)
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? fischl_find_entry(root_node, ParentPath)
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: root_node->self_info;
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if (parent_filenode == NULL) {
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fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__, __LINE__,
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ParentPath);
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free(pathdup);
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return -ENOENT; // parentpath directory does not exist
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}
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u_int64_t parent_inode_number = parent_filenode->inode_number;
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// printf("%s, %llu, %s\n", parent_filenode->name, parent_inode_number,
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// newDirname); make new inode
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INode_Data *ret =
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create_new_inode(parent_inode_number, newDirname,
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mode | S_IFDIR); // specify S_IFDIR as directory
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if (ret == NULL)
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return -1; // ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
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fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newDirname,
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ret);
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free(pathdup);
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return 0; // SUCCESS
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}
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/*
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special file
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*/
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int FilesOperation::fischl_mknod(const char *path, mode_t mode, dev_t dev) {
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// check path
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char *pathdup = strdup(path);
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char *lastSlash = strrchr(pathdup, '/');
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*lastSlash = '\0'; // Split the string into parent path and new directory
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// name; <parent path>\0<direcotry name>
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char *newFilename =
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lastSlash + 1; //\0<direcotry name>, get from <direcotry name>
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char *ParentPath = pathdup; // pathdup are separated by pathdup, so it take
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// <parent path> only
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// fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__,
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// ParentPath, strlen(ParentPath));
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FileNode *parent_filenode = strlen(ParentPath)
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? fischl_find_entry(root_node, ParentPath)
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: root_node->self_info;
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if (parent_filenode == NULL) {
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fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__, __LINE__,
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ParentPath);
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free(pathdup);
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return -1;
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}
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u_int64_t parent_inode_number = parent_filenode->inode_number;
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// make new inode
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INode_Data *ret = create_new_inode(parent_inode_number, newFilename, mode);
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if (ret == NULL)
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return -1; // ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
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// make new node
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fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newFilename,
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ret);
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free(pathdup);
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return 0; // SUCESS
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}
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/*
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regular file
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*/
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int FilesOperation::fischl_create(const char *path, mode_t mode,
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struct fuse_file_info *fi) {
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// check path
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char *pathdup = strdup(path);
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char *lastSlash = strrchr(pathdup, '/');
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*lastSlash = '\0'; // Split the string into parent path and new directory
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// name; <parent path>\0<direcotry name>
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char *newFilename =
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lastSlash + 1; //\0<direcotry name>, get from <direcotry name>
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char *ParentPath = pathdup; // pathdup are separated by pathdup, so it take
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// <parent path> only
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// fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__,
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// ParentPath, strlen(ParentPath));
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FileNode *parent_filenode = strlen(ParentPath)
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? fischl_find_entry(root_node, ParentPath)
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: root_node->self_info;
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if (parent_filenode == NULL) {
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fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__, __LINE__,
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ParentPath);
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free(pathdup);
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return -1;
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}
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u_int64_t parent_inode_number = parent_filenode->inode_number;
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// make new inode
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INode_Data *ret = create_new_inode(parent_inode_number, newFilename, mode);
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if (ret == NULL)
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return -1; // ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
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// make new node in RAM
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fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newFilename,
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ret);
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// directly give inode number rather than create file descriptor table
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fi->fh =
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ret->inode_num; // assign file descriptor as inode number to fuse system
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free(pathdup);
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return 0; // SUCESS
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}
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int FilesOperation::fischl_getattr(const char *path, struct stat *stbuf,
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struct fuse_file_info *fi) {
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(void)fi;
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int res = 0;
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u_int64_t fh = namei(path);
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if (fh == -1) {
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return -ENOENT;
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}
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INode_Data inode;
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inode.inode_num = fh;
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fs->inode_manager->load_inode(&inode);
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memset(stbuf, 0, sizeof(struct stat));
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if ((inode.metadata.permissions & S_IFMT) == S_IFDIR) {
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stbuf->st_mode = S_IFDIR | 0755;
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stbuf->st_nlink = inode.metadata.reference_count;
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stbuf->st_uid = inode.metadata.uid;
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stbuf->st_gid = inode.metadata.gid;
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} else {
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stbuf->st_mode = S_IFREG | 0444;
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stbuf->st_nlink = inode.metadata.reference_count;
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stbuf->st_uid = inode.metadata.uid;
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stbuf->st_gid = inode.metadata.gid;
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stbuf->st_size = inode.metadata.size;
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}
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perror(std::to_string(inode.metadata.size).c_str());
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return res;
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}
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int FilesOperation::fischl_readdir(const char *path, void *buf,
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fuse_fill_dir_t filler, off_t ft,
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struct fuse_file_info *fi,
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enum fuse_readdir_flags flg) {
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// check path
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u_int64_t fh = namei(path);
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if (fh == -1) {
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return -1;
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}
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INode_Data inode;
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inode.inode_num = fh;
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fs->inode_manager->load_inode(&inode);
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char buffer[IO_BLOCK_SIZE] = {0};
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for (u_int64_t idx = 0; idx < inode.metadata.size / IO_BLOCK_SIZE; idx++) {
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fs->read(&inode, buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
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DirectoryEntry ent;
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for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
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ent.deserialize(buffer + i);
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if (ent.inode_number) {
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filler(buf, ent.file_name, NULL, 0, FUSE_FILL_DIR_PLUS);
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// printf("%s\t%llu;\t", ent.file_name, ent.inode_number);
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}
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}
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}
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return 0;
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}
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int FilesOperation::fischl_releasedir(const char *path,
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struct fuse_file_info *fi) {
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if (fischl_find_entry(root_node, path) == NULL)
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return -ENOENT;
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// do with file descriptor that cannot be used
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fi->fh = -1;
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return 0; // SUCESS
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}
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void FilesOperation::unlink_inode(u_int64_t inode_number) {
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INode_Data inode;
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inode.inode_num = inode_number;
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fs->inode_manager->load_inode(&inode);
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if ((inode.metadata.permissions & S_IFMT) == S_IFDIR) {
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char buffer[IO_BLOCK_SIZE] = {0};
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for (u_int64_t idx = 0; idx < inode.metadata.size / IO_BLOCK_SIZE; idx++) {
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fs->read(&inode, buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
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DirectoryEntry ent;
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for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
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if (ent.inode_number && strcmp(ent.file_name, ".") &&
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strcmp(ent.file_name, "..")) {
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unlink_inode(ent.inode_number);
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}
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}
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}
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}
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// TODO: error handling
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int res = fs->truncate(&inode, 0);
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fs->inode_manager->free_inode(&inode);
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}
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int FilesOperation::fischl_rmdir(const char *path) {
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char *pathdup = strdup(path);
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char *lastSlash = strrchr(pathdup, '/');
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*lastSlash = '\0';
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char *dirname = lastSlash + 1;
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char *ParentPath = pathdup;
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if (!strcmp(dirname, ".") || !strcmp(dirname, "..")) {
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printf("refusing to remove . or ..\n");
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return -1;
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}
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FileNode *parent_filenode = fischl_find_entry(root_node, ParentPath);
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if (parent_filenode == NULL) {
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printf("parent %s not found by fischl_find_entry\n", ParentPath);
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free(pathdup);
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return -1;
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}
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u_int64_t parent_inode_number = parent_filenode->inode_number;
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u_int64_t target_inode = 0;
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// remove its record from parent
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INode_Data parent_INode;
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parent_INode.inode_num = parent_inode_number;
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fs->inode_manager->load_inode(&parent_INode);
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char rw_buffer[IO_BLOCK_SIZE] = {0};
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for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
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idx++) {
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fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
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DirectoryEntry ent;
|
|
for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
|
|
ent.deserialize(rw_buffer + i);
|
|
if (strcmp(ent.file_name, dirname) == 0) {
|
|
target_inode = ent.inode_number;
|
|
ent.inode_number = 0;
|
|
memset(ent.file_name, 0, sizeof(ent.file_name));
|
|
ent.serialize(rw_buffer + i);
|
|
break;
|
|
}
|
|
}
|
|
if (target_inode) {
|
|
fs->write(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// remove inode itself
|
|
if (target_inode) {
|
|
unlink_inode(target_inode);
|
|
// remove node itself and from parent hash
|
|
fischl_rm_entry(parent_filenode->subdirectory, dirname);
|
|
free(pathdup);
|
|
return 0;
|
|
} else {
|
|
printf("cannot find %s in %s", dirname, ParentPath);
|
|
free(pathdup);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int FilesOperation::fischl_chmod(const char *path, mode_t mode,
|
|
struct fuse_file_info *fi) {
|
|
(void)fi;
|
|
int res = 0;
|
|
u_int64_t fh = namei(path);
|
|
|
|
if (fh == -1) {
|
|
return -ENOENT;
|
|
}
|
|
|
|
INode_Data inode;
|
|
inode.inode_num = fh;
|
|
fs->inode_manager->load_inode(&inode);
|
|
inode.metadata.permissions = mode;
|
|
fs->inode_manager->save_inode(&inode);
|
|
return 0;
|
|
}
|
|
|
|
int FilesOperation::fischl_chown(const char *path, uid_t uid, gid_t gid,
|
|
struct fuse_file_info *fi) {
|
|
(void)fi;
|
|
int res = 0;
|
|
u_int64_t fh = namei(path);
|
|
|
|
if (fh == -1) {
|
|
return -ENOENT;
|
|
}
|
|
|
|
INode_Data inode;
|
|
inode.inode_num = fh;
|
|
fs->inode_manager->load_inode(&inode);
|
|
inode.metadata.uid = uid;
|
|
inode.metadata.gid = gid;
|
|
fs->inode_manager->save_inode(&inode);
|
|
return 0;
|
|
}
|
|
|
|
int FilesOperation::fischl_unlink(const char *path) {
|
|
char *pathdup = strdup(path);
|
|
char *lastSlash = strrchr(pathdup, '/');
|
|
*lastSlash = '\0';
|
|
char *filename = lastSlash + 1;
|
|
char *ParentPath = pathdup;
|
|
if (!strcmp(filename, ".") || !strcmp(filename, "..")) {
|
|
printf("refusing to remove . or ..\n");
|
|
return -1;
|
|
}
|
|
FileNode *parent_filenode = fischl_find_entry(root_node, ParentPath);
|
|
if (parent_filenode == NULL) {
|
|
printf("parent %s not found by fischl_find_entry\n", ParentPath);
|
|
free(pathdup);
|
|
return -1;
|
|
}
|
|
u_int64_t parent_inode_number = parent_filenode->inode_number;
|
|
u_int64_t target_inode = 0;
|
|
|
|
// remove its record from parent
|
|
INode_Data parent_INode;
|
|
parent_INode.inode_num = parent_inode_number;
|
|
fs->inode_manager->load_inode(&parent_INode);
|
|
char rw_buffer[IO_BLOCK_SIZE] = {0};
|
|
for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
|
|
idx++) {
|
|
fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
DirectoryEntry ent;
|
|
for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
|
|
ent.deserialize(rw_buffer + i);
|
|
if (strcmp(ent.file_name, filename) == 0) {
|
|
target_inode = ent.inode_number;
|
|
ent.inode_number = 0;
|
|
memset(ent.file_name, 0, sizeof(ent.file_name));
|
|
ent.serialize(rw_buffer + i);
|
|
break;
|
|
}
|
|
}
|
|
if (target_inode) {
|
|
fs->write(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// remove inode itself
|
|
if (target_inode) {
|
|
unlink_inode(target_inode);
|
|
// remove node itself and from parent hash
|
|
fischl_rm_entry(parent_filenode->subdirectory, filename);
|
|
free(pathdup);
|
|
return 0;
|
|
} else {
|
|
printf("cannot find %s in %s", filename, ParentPath);
|
|
free(pathdup);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int FilesOperation::fischl_open(const char *path, struct fuse_file_info *fi) {
|
|
/*Creation (O_CREAT, O_EXCL, O_NOCTTY) flags will be filtered out / handled by
|
|
the kernel. if no files will use create function
|
|
*/
|
|
FileNode *get_file;
|
|
if ((get_file = fischl_find_entry(root_node, path)) == NULL)
|
|
return -ENOENT;
|
|
// if need to do with flag fi->flags ((fi->flags & O_ACCMODE)). Initial
|
|
// setting ALL access create function will handle file descriptor fi->fh
|
|
fi->fh = get_file->inode_number;
|
|
return 0; // SUCESS
|
|
}
|
|
|
|
int FilesOperation::fischl_release(const char *path,
|
|
struct fuse_file_info *fi) {
|
|
/*Creation (O_CREAT, O_EXCL, O_NOCTTY) flags will be filtered out / handled by
|
|
the kernel. if no files will use create function
|
|
*/
|
|
FileNode *get_file;
|
|
if ((get_file = fischl_find_entry(root_node, path)) == NULL)
|
|
return -ENOENT;
|
|
// do with file descriptor that cannot be used
|
|
fi->fh = -1;
|
|
return 0; // SUCESS
|
|
}
|
|
|
|
int FilesOperation::fischl_write(const char *path, const char *buf, size_t size,
|
|
off_t offset, struct fuse_file_info *fi) {
|
|
/** Write data to an open file
|
|
*
|
|
* Write should return exactly the number of bytes requested
|
|
* except on error. An exception to this is when the 'direct_io'
|
|
* mount option is specified (see read operation).
|
|
*
|
|
* Unless FUSE_CAP_HANDLE_KILLPRIV is disabled, this method is
|
|
* expected to reset the setuid and setgid bits.
|
|
*/
|
|
// use path for debug, filedescriptor is enough
|
|
// FileNode *get_file;
|
|
// if((get_file = fischl_find_entry(root_node, path)) == NULL)
|
|
// return -ENOENT;
|
|
// Caution! this based on content in file are multiple of IO_BLOCK_SIZE, not
|
|
// the exact write size. based on current write_datablock API implement, when
|
|
// write_datablock pass with actual size not index this function should be
|
|
// fixed
|
|
|
|
INode_Data inode;
|
|
// Assuming inode is correctly initialized here based on 'path'
|
|
inode.inode_num = fi->fh;
|
|
fs->inode_manager->load_inode(&inode);
|
|
// size_t len = (inode.metadata.size/IO_BLOCK_SIZE) * IO_BLOCK_SIZE; //
|
|
// Assuming each block is 4096 bytes
|
|
// Determine the length of the buffer
|
|
// Allocate memory for the new buffer
|
|
char *buffer = (char *)malloc(size);
|
|
memcpy(buffer, buf, size);
|
|
size_t bytes_write = fs->write(&inode, buffer, size, offset);
|
|
/*size_t block_index = offset / IO_BLOCK_SIZE; // Starting block index
|
|
size_t block_offset = offset % IO_BLOCK_SIZE; // Offset within the first block
|
|
while (bytes_write < size) {
|
|
char block_buffer[IO_BLOCK_SIZE]; // Temporary buffer for each block
|
|
size_t copy_size = std::min(size - bytes_write, IO_BLOCK_SIZE -
|
|
block_offset); memcpy(block_buffer + block_offset, buf + bytes_write,
|
|
copy_size); fs->write(&inode, block_buffer, IO_BLOCK_SIZE,
|
|
block_index*IO_BLOCK_SIZE);
|
|
// fprintf(stderr,"[%s ,%d] inode.size %d, block_index %d, block_buffer
|
|
%s\n",__func__,__LINE__, inode.size, block_index, block_buffer); bytes_write
|
|
+= copy_size; block_index++; block_offset = 0; // Only the first block might
|
|
have a non-zero offset
|
|
}*/
|
|
fs->inode_manager->save_inode(&inode);
|
|
free(buffer);
|
|
return bytes_write; // Return the actual number of bytes read
|
|
}
|
|
|
|
int FilesOperation::insert_inode_to(u_int64_t parent_inode_number,
|
|
const char *name, INode_Data *new_inode) {
|
|
// trys to create a file under parent directory
|
|
if (strlen(name) >= 256) {
|
|
perror("Name too long, cannot create file or directory");
|
|
return -1;
|
|
}
|
|
INode_Data inode;
|
|
inode.inode_num = parent_inode_number;
|
|
fs->inode_manager->load_inode(&inode);
|
|
if ((inode.metadata.permissions & S_IFMT) != S_IFDIR) {
|
|
fprintf(stderr, "[%s ,%d] please create under directory\n", __func__,
|
|
__LINE__);
|
|
return -1;
|
|
}
|
|
|
|
// Check if file or directory already exists
|
|
char r_buffer[IO_BLOCK_SIZE] = {0};
|
|
for (u_int64_t idx = 0; idx < inode.metadata.size / IO_BLOCK_SIZE; idx++) {
|
|
fs->read(&inode, r_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
DirectoryEntry ent;
|
|
for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
|
|
ent.deserialize(r_buffer + i);
|
|
if (strcmp(ent.file_name, name) == 0 && ent.inode_number != 0) {
|
|
if ((new_inode->metadata.permissions & S_IFMT) == S_IFDIR) {
|
|
fprintf(stderr, "[%s ,%d] %s/ already exists\n", __func__, __LINE__,
|
|
name);
|
|
} else {
|
|
fprintf(stderr, "[%s ,%d] %s already exists\n", __func__, __LINE__,
|
|
name);
|
|
}
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool allocated = false;
|
|
|
|
char rw_buffer[IO_BLOCK_SIZE] = {0};
|
|
for (u_int64_t idx = 0; idx < inode.metadata.size / IO_BLOCK_SIZE; idx++) {
|
|
fs->read(&inode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
DirectoryEntry ent;
|
|
for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
|
|
ent.deserialize(rw_buffer + i);
|
|
if (ent.inode_number == 0) {
|
|
allocated = true;
|
|
ent.inode_number = new_inode->inode_num;
|
|
strcpy(ent.file_name, name);
|
|
ent.serialize(rw_buffer + i);
|
|
break;
|
|
}
|
|
}
|
|
if (allocated) {
|
|
fs->write(&inode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!allocated) {
|
|
char write_buffer[IO_BLOCK_SIZE] = {0};
|
|
DirectoryEntry ent;
|
|
ent.inode_number = new_inode->inode_num;
|
|
strcpy(ent.file_name, name);
|
|
ent.serialize(write_buffer);
|
|
fs->write(&inode, write_buffer, IO_BLOCK_SIZE,
|
|
(inode.metadata.size / IO_BLOCK_SIZE) * IO_BLOCK_SIZE);
|
|
fs->inode_manager->save_inode(&inode);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// TODO: rename dir and rename fail
|
|
int FilesOperation::fischl_rename(const char *path, const char *new_name,
|
|
unsigned int flags) {
|
|
char *pathdup = strdup(path);
|
|
char *lastSlash = strrchr(pathdup, '/');
|
|
*lastSlash = '\0';
|
|
char *filename = lastSlash + 1;
|
|
char *ParentPath = pathdup;
|
|
if (!strcmp(filename, ".") || !strcmp(filename, "..")) {
|
|
printf("refusing to remove . or ..\n");
|
|
return -1;
|
|
}
|
|
FileNode *parent_filenode = fischl_find_entry(root_node, ParentPath);
|
|
if (parent_filenode == NULL) {
|
|
printf("parent %s not found by fischl_find_entry\n", ParentPath);
|
|
free(pathdup);
|
|
return -1;
|
|
}
|
|
u_int64_t parent_inode_number = parent_filenode->inode_number;
|
|
u_int64_t target_inode = 0;
|
|
|
|
// remove its record from parent
|
|
INode_Data parent_INode;
|
|
parent_INode.inode_num = parent_inode_number;
|
|
fs->inode_manager->load_inode(&parent_INode);
|
|
char rw_buffer[IO_BLOCK_SIZE] = {0};
|
|
for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
|
|
idx++) {
|
|
fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
DirectoryEntry ent;
|
|
for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
|
|
ent.deserialize(rw_buffer + i);
|
|
if (strcmp(ent.file_name, filename) == 0) {
|
|
target_inode = ent.inode_number;
|
|
break;
|
|
}
|
|
}
|
|
if (target_inode) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// remove inode itself
|
|
if (target_inode) {
|
|
INode_Data ret;
|
|
ret.inode_num = target_inode;
|
|
fs->inode_manager->load_inode(&ret);
|
|
|
|
if (flags == RENAME_EXCHANGE) {
|
|
printf("RENAME_EXCHANGE ");
|
|
} else if (flags == RENAME_NOREPLACE) {
|
|
printf("RENAME_NOREPLACE ");
|
|
} else
|
|
printf("ELSE ");
|
|
|
|
printf("FOUND INODE AT %llu %s\n", target_inode, new_name);
|
|
char *pathdup2 = strdup(new_name);
|
|
char *lastSlash2 = strrchr(pathdup2, '/');
|
|
*lastSlash2 = '\0'; // Split the string into parent path and new directory
|
|
// name; <parent path>\0<direcotry name>
|
|
char *newDirname2 =
|
|
lastSlash2 + 1; //\0<direcotry name>, get from <direcotry name>
|
|
char *ParentPath2 = pathdup2; // pathdup are separated by pathdup, so it
|
|
// take <parent path> only
|
|
|
|
FileNode *parent_filenode2 = strlen(ParentPath)
|
|
? fischl_find_entry(root_node, ParentPath2)
|
|
: root_node->self_info;
|
|
if (parent_filenode2 == NULL) {
|
|
fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__,
|
|
__LINE__, ParentPath2);
|
|
free(pathdup2);
|
|
return -ENOENT; // parentpath directory does not exist
|
|
}
|
|
u_int64_t parent_inode_number2 = parent_filenode2->inode_number;
|
|
// printf("%s, %llu, %s\n", parent_filenode->name, parent_inode_number,
|
|
// newDirname); make new inode
|
|
if (insert_inode_to(parent_inode_number2, newDirname2, &ret) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
|
|
idx++) {
|
|
fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
DirectoryEntry ent;
|
|
for (int i = 0; i <= IO_BLOCK_SIZE - 264; i += 264) {
|
|
ent.deserialize(rw_buffer + i);
|
|
if (strcmp(ent.file_name, filename) == 0) {
|
|
target_inode = ent.inode_number;
|
|
ent.inode_number = 0;
|
|
memset(ent.file_name, 0, sizeof(ent.file_name));
|
|
ent.serialize(rw_buffer + i);
|
|
break;
|
|
}
|
|
}
|
|
if (target_inode) {
|
|
fs->write(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx * IO_BLOCK_SIZE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
fischl_rm_entry(parent_filenode->subdirectory, filename);
|
|
fischl_add_entry(parent_filenode2->subdirectory, ret.inode_num, newDirname2,
|
|
&ret);
|
|
free(pathdup);
|
|
// remove node itself and from parent hash
|
|
free(pathdup2);
|
|
return 0;
|
|
} else {
|
|
printf("cannot find %s in %s", filename, ParentPath);
|
|
free(pathdup);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int FilesOperation::fischl_truncate(const char *path, off_t offset,
|
|
struct fuse_file_info *fi) {
|
|
(void)fi;
|
|
int res = 0;
|
|
u_int64_t fh = namei(path);
|
|
|
|
if (fh == -1) {
|
|
return -ENOENT;
|
|
}
|
|
|
|
INode_Data inode;
|
|
inode.inode_num = fh;
|
|
fs->inode_manager->load_inode(&inode);
|
|
res = fs->truncate(&inode, offset);
|
|
fs->inode_manager->save_inode(&inode);
|
|
return res;
|
|
}
|
|
|
|
int FilesOperation::fischl_read(const char *path, char *buf, size_t size,
|
|
off_t offset, struct fuse_file_info *fi) {
|
|
/** Read data from an open file
|
|
*
|
|
* Read should return exactly the number of bytes requested except
|
|
* on EOF or error, otherwise the rest of the data will be
|
|
* substituted with zeroes. An exception to this is when the
|
|
* 'direct_io' mount option is specified, in which case the return
|
|
* value of the read system call will reflect the return value of
|
|
* this operation.
|
|
*/
|
|
// Caution! this based on content in file are multiple of IO_BLOCK_SIZE, not
|
|
// the exact write size. based on current read_datablock API implement, when
|
|
// read_datablock pass with actual size not index this function should be
|
|
// fixed
|
|
INode_Data inode;
|
|
// Assuming inode is correctly initialized here based on 'path'
|
|
inode.inode_num = fi->fh;
|
|
fs->inode_manager->load_inode(&inode);
|
|
size_t bytes_read = fs->read(&inode, buf, size, offset);
|
|
/*size_t len = (inode.metadata.size/IO_BLOCK_SIZE) * IO_BLOCK_SIZE; //
|
|
Assuming each block is 4096 bytes
|
|
|
|
if (offset >= len) return 0; // Offset is beyond the end of the file
|
|
if (offset + size > len) size = len - offset; // Adjust size if it goes
|
|
beyond EOF
|
|
|
|
size_t bytes_read = 0;
|
|
size_t block_index = offset / IO_BLOCK_SIZE; // Starting block index
|
|
size_t block_offset = offset % IO_BLOCK_SIZE; // Offset within the first block
|
|
// fprintf(stderr,"[%s ,%d] inode.metadata.size %d\n",__func__,__LINE__,
|
|
inode.metadata.size); while (bytes_read < size && block_index <
|
|
inode.metadata.size/IO_BLOCK_SIZE) { char block_buffer[IO_BLOCK_SIZE]; //
|
|
Temporary buffer for each block fs->read(&inode, block_buffer, IO_BLOCK_SIZE,
|
|
block_index*IO_BLOCK_SIZE);
|
|
// fprintf(stderr,"[%s ,%d] block_index %d\n",__func__,__LINE__,
|
|
block_index); size_t copy_size = std::min(size - bytes_read, IO_BLOCK_SIZE -
|
|
block_offset); memcpy(buf + bytes_read, block_buffer + block_offset,
|
|
copy_size);
|
|
// fprintf(stderr,"[%s ,%d] buf %s, block_buffer %s\n",__func__,__LINE__,
|
|
buf, block_buffer); bytes_read += copy_size; block_index++; block_offset = 0;
|
|
// Only the first block might have a non-zero offset
|
|
}*/
|
|
|
|
return bytes_read; // Return the actual number of bytes read
|
|
} |