| 13 | namespace vfs { |
| 14 | |
| 15 | auto Unlink(const char* path) -> Expected<void> { |
| 16 | if (path == nullptr) { |
| 17 | return std::unexpected(Error(ErrorCode::kInvalidArgument)); |
| 18 | } |
| 19 | |
| 20 | LockGuard<SpinLock> guard(GetVfsState().vfs_lock_); |
| 21 | // 解析父目录路径和文件名 |
| 22 | char parent_path[512]; |
| 23 | char file_name[256]; |
| 24 | const char* last_slash = strrchr(path, '/'); |
| 25 | if (last_slash == nullptr || last_slash == path) { |
| 26 | strncpy(parent_path, "/", sizeof(parent_path)); |
| 27 | strncpy(file_name, path[0] == '/' ? path + 1 : path, sizeof(file_name)); |
| 28 | } else { |
| 29 | size_t parent_len = last_slash - path; |
| 30 | if (parent_len >= sizeof(parent_path)) { |
| 31 | parent_len = sizeof(parent_path) - 1; |
| 32 | } |
| 33 | strncpy(parent_path, path, parent_len); |
| 34 | parent_path[parent_len] = '\0'; |
| 35 | strncpy(file_name, last_slash + 1, sizeof(file_name)); |
| 36 | } |
| 37 | file_name[sizeof(file_name) - 1] = '\0'; |
| 38 | |
| 39 | // 查找父目录 |
| 40 | auto parent_result = Lookup(parent_path); |
| 41 | if (!parent_result.has_value()) { |
| 42 | return std::unexpected(parent_result.error()); |
| 43 | } |
| 44 | |
| 45 | Dentry* parent_dentry = parent_result.value(); |
| 46 | if (parent_dentry->inode == nullptr) { |
| 47 | return std::unexpected(Error(ErrorCode::kFsCorrupted)); |
| 48 | } |
| 49 | |
| 50 | // 查找目标文件 |
| 51 | Dentry* target_dentry = FindChild(parent_dentry, file_name); |
| 52 | if (target_dentry == nullptr) { |
| 53 | return std::unexpected(Error(ErrorCode::kFsFileNotFound)); |
| 54 | } |
| 55 | |
| 56 | if (target_dentry->inode == nullptr) { |
| 57 | return std::unexpected(Error(ErrorCode::kFsCorrupted)); |
| 58 | } |
| 59 | |
| 60 | // 不能删除目录 |
| 61 | if (target_dentry->inode->type == FileType::kDirectory) { |
| 62 | return std::unexpected(Error(ErrorCode::kFsIsADirectory)); |
| 63 | } |
| 64 | |
| 65 | // 删除文件 |
| 66 | if (parent_dentry->inode->ops == nullptr) { |
| 67 | return std::unexpected(Error(ErrorCode::kDeviceNotSupported)); |
| 68 | } |
| 69 | |
| 70 | auto result = |
| 71 | parent_dentry->inode->ops->Unlink(parent_dentry->inode, file_name); |
| 72 | if (!result.has_value()) { |