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block: qcow: Preserve the compression type when writing the header

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When writing the header after a resize the compression type field was
always set to 0, which selects zlib, even when the image was originally
created with zstd. The resized image would then no longer be usable.

Write the actual configured compression type instead.

Fixes: #8558

Assisted-by: Claude:Opus-4.8
Signed-off-by: Rob Bradford <rbradford@meta.com>
This commit is contained in:
Rob Bradford
2026-07-08 07:45:00 -07:00
parent 8d3859af0d
commit 5b99f9ce41
1 changed files with 6 additions and 2 deletions
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8
block/src/formats/qcow/header.rs
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@@ -576,8 +576,12 @@ impl QcowHeader {
buf.extend_from_slice(v3.as_bytes());
if self.header_size > V3_BARE_HEADER_SIZE {
// no compression
buf.extend_from_slice(BeU64::new(0).as_bytes());
let compression_type = match &self.compression_type {
CompressionType::Zlib => COMPRESSION_TYPE_ZLIB,
CompressionType::Zstd => COMPRESSION_TYPE_ZSTD,
};
let compression_type = BeU64::new(compression_type << (64 - 8));
buf.extend_from_slice(compression_type.as_bytes());
}
let end_extension = ExtensionHeader::end();