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qemu-img: avoid unaligned read requests during convert

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in case of large continous areas that share the same allocation status
it happens that the value of s->sector_next_status is unaligned to the
cluster size or even request alignment of the source. Avoid this by
stripping down the s->sector_next_status position to cluster boundaries.

Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <20200901125129.6398-1-pl@kamp.de>
[mreitz: Disable vhdx for 251]
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Peter Lieven 2020-09-01 14:51:29 +02:00 • committed by Max Reitz
parent 5eb9a3c7b0
commit af8d43d393
2 changed files with 27 additions and 2 deletions
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7
tests/qemu-iotests/251
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@ -46,8 +46,11 @@ if [ "$IMGOPTSSYNTAX" = "true" ]; then
# We use json:{} filenames here, so we cannot work with additional options.
_unsupported_fmt $IMGFMT
else
# With VDI, the output is ordered differently. Just disable it.
_unsupported_fmt vdi
# - With VDI, the output is ordered differently. Just disable it.
# - VHDX has large clusters; because qemu-img convert tries to
# align the requests to the cluster size, the output is ordered
# differently, so disable it, too.
_unsupported_fmt vdi vhdx
fi