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<think>
Okay, so I'm trying to figure out how to classify this bug report for QEMU. The user provided some commands and outputs showing that when they convert an image using `qemu-img convert` with the `-o backing_file` option, the resulting image ends up being larger than expected. They mentioned that instead of only including data not present in the backing file, both the source and backing file's data are included, making the new image bigger.
Looking at the possible categories: mistranslation, assembly lowering, other, device, graphic, socket, network, KVM, boot, vnc, debug, files, permissions, performance, kernel, peripherals, hypervisor.
The issue here is related to how QEMU handles backing files during conversion. It seems like the resulting image isn't properly referencing the backing file's data but instead includes all the data from both the source and the backing file, which shouldn't be necessary if it's leveraging the backing file correctly.
This doesn't seem to be a translation issue or related to assembly lowering, so "mistranslation" and "assembly" are probably out. It's also not directly about networking, graphics, or any hardware devices. KVM is more about virtualization management, which might not fit here either.
The problem is with the file handling—specifically, how QEMU manages the backing files during image conversion. The resulting image size suggests an issue with how data is being written or referenced. It's not a performance issue per se but rather incorrect behavior in data handling.
Looking at the categories again, "files" seems to fit because it's about file operations and how the images are being handled. Alternatively, "other" could be considered, but since it's specifically related to file management during image conversion, I think "files" is more precise.
</think>
The issue revolves around incorrect handling of backing files during image conversion, leading to larger than expected image sizes. This pertains directly to how QEMU manages file operations.
**files**
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