Method copyFileFromDisk

src/Backups/BackupIO_Disk.cpp:129–152

}

void BackupWriterDisk::copyFileFromDisk(
    const String & path_in_backup, DiskPtr src_disk, const String & src_path, bool copy_encrypted, UInt64 start_pos, UInt64 length)
{
    /// Use IDisk::copyFile() as a more optimal way to copy a file if it's possible.
    /// However IDisk::copyFile() can't use throttling for reading, and can't copy an encrypted file or copy a part of the file.
    bool has_throttling = src_disk->isRemote() ? static_cast<bool>(read_settings.remote_throttler) : static_cast<bool>(read_settings.local_throttler);
    if (!has_throttling && !start_pos && !copy_encrypted)
    {
        auto source_data_source_description = src_disk->getDataSourceDescription();
        if (source_data_source_description.sameKind(data_source_description) && !source_data_source_description.is_encrypted
            && (length == src_disk->getFileSize(src_path)))
        {
            /// Use more optimal way.
            LOG_TRACE(log, "Copying file {} from disk {} to disk {}", src_path, src_disk->getName(), disk->getName());
            auto dest_file_path = root_path / path_in_backup;
            disk->createDirectories(dest_file_path.parent_path());
            src_disk->copyFile(src_path, *disk, dest_file_path, read_settings, write_settings);
            return; /// copied!
        }
    }

    /// Fallback to copy through buffers.
    BackupWriterDefault::copyFileFromDisk(path_in_backup, src_disk, src_path, copy_encrypted, start_pos, length);
}

void BackupWriterDisk::copyFile(const String & destination, const String & source, size_t /*size*/)
{