| 578 | } |
| 579 | |
| 580 | auto RamFs::ExpandFile(RamInode* inode, size_t new_size) -> Expected<void> { |
| 581 | if (inode == nullptr) { |
| 582 | return std::unexpected(Error(ErrorCode::kInvalidArgument)); |
| 583 | } |
| 584 | |
| 585 | if (new_size <= inode->capacity) { |
| 586 | return {}; |
| 587 | } |
| 588 | |
| 589 | // 计算新容量（按 256 字节对齐） |
| 590 | size_t new_capacity = ((new_size + 255) / 256) * 256; |
| 591 | |
| 592 | uint8_t* new_data = static_cast<uint8_t*>(AllocateFileData(new_capacity)); |
| 593 | if (new_data == nullptr) { |
| 594 | return std::unexpected(Error(ErrorCode::kOutOfMemory)); |
| 595 | } |
| 596 | |
| 597 | // 复制旧数据 |
| 598 | if (inode->data != nullptr) { |
| 599 | memcpy(new_data, inode->data, inode->inode.size); |
| 600 | // Old allocation stays in pool (bump allocator — no per-block free) |
| 601 | } |
| 602 | |
| 603 | inode->data = new_data; |
| 604 | inode->capacity = new_capacity; |
| 605 | |
| 606 | return {}; |
| 607 | } |
| 608 | |
| 609 | auto RamFs::AllocateFileData(size_t size) -> void* { |
| 610 | // Align up to 16 bytes |