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Ran 09 Dec 2025 03:36AM UTC

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Committed 08 Dec 2025 09:02AM UTC coverage: 80.459%. Remained the same

Job # 20050970249.1

Build Type

push

github

Committed by

web-flow

Commit Message

qcow: Only process allocated clusters on export from raw (#6769)

Implements an optimization similar to the "hybrid" mode in `vhd-tool`:
when exporting to qcow from raw, if the VDI is backed by a QCOW file,
read its header, determine the allocated clusters, and only export
these. This allows skipping over zero clusters in a sparse disk.

Unlike `vhd-tool`, however, this is implemented in a modular way -
`qcow-stream-tool` gets a new `read_headers` command that outputs the
list of allocated clusters (and other info) in JSON format, which allows
it to be consumed by the Python `qcow-to-stdout` script (and by
`vhd-tool` in future stages of this work, see below).

This is the first step of improving handling of sparse VDIs in xapi.
I've got the rest working, but I'll be opening PRs step-by-step for the
following once this PR gets merged:
1. `vhd-tool` gets a `read_headers` command outputting list of allocated
blocks as well
2. `stream_vdi` uses `read_headers` for both VHD and QCOW to avoid
reading zero blocks on XVA export (greatly speeds up handling of sparse
disks and avoids issues with timeouts)
3. `vhd-tool` and `qcow-to-stdout` can read headers of the opposite
format, allowing faster export of sparse VDIs backed by a different
format.

Best reviewed by commit.

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