20751761446
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Ran 06 Jan 2026 02:44PM UTC

Jobs 1

Files 34

Run time 1min

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Committed 06 Jan 2026 02:36PM UTC coverage: 80.459%. Remained the same

Build # 20751761446

Build Type

push

github

Committed by

web-flow

Commit Message

stream_vdi: Only process allocated clusters for VHD and QCOW on XVA export (#6786)

Following https://github.com/xapi-project/xen-api/pull/6769, add a
`read_headers` command to `vhd-tool` (following `qcow-tool`'s JSON
format). This allows `stream_vdi` to determine which clusters are
allocated in QCOW- and VHD-backed VDIs, only reading and writing
allocated blocks (previously it read the whole raw disk, verifying if
blocks only contain zeros).

If there are any issues during header parsing, it falls back to the slow
path (we don't handle errors during XVA export well, embedding 500
packets inside 200s)

This greatly speeds up XVA export for VMs with sparse VDIs:

5gb empty VDI: 19s -> 3s
5gb empty VDI + 2mb filled VDI: 22s -> 6s
5gb empty VDI + half-empty VDI (~4 gigs out of 10): 89s -> 49s

Note: If the block size of the VDI is larger than the size of the XVA
blocks (this is currently the case for VHD, it has blocks of 2mb, while
stream_vdi splits xvas into files of 1mb), stream_vdi can overestimate
the size of allocated data (say, if only the first half of the VHD block
has data), but in testing with real VDIs this impact was within a margin
of error.

Run Details

3504 of 4355 relevant lines covered (80.46%)

0.8 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	python3.11 - 20751761446.1	06 Jan 2026 02:44PM UTC	34	80.46	GitHub Action Run

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