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block: qcow: support compressed clusters (zlib, zstd)

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Add support of reading and writing compressed clusters.
Support zlib and zstd compressions.

L2 cache: store entire L2 entries, not only standard cluster addresses.

Read path. Offsets of compressed clusters cannot be determined,
therefore replace QcowFile.file_offset_read() with QcowFile.file_read().
This method reads the cluster, decompresses it if necessary and returns
the data to the caller.

Write path. QcowFile.file_offset_write(): since writing to compressed
clusters is not generally possible, allocate a new standard
(non-compressed) cluster if compressed L2 entry is encountered; then
decompress compressed cluster into new cluster; then return offset
inside new cluster to the caller. Processing of standard clusters is
not changed.

Signed-off-by: Eugene Korenevsky <ekorenevsky@aliyun.com>
This commit is contained in:
Eugene Korenevsky
2025-11-04 03:34:56 +03:00
committed by Rob Bradford
parent 4d79709b5e
commit aa67250049
4 changed files with 311 additions and 72 deletions
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59
Cargo.lock generated
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@@ -321,6 +321,7 @@ version = "0.1.0"
dependencies = [
"byteorder",
"crc-any",
"flate2",
"io-uring",
"libc",
"log",
@@ -334,6 +335,7 @@ dependencies = [
"vm-memory",
"vm-virtio",
"vmm-sys-util",
"zstd",
]
[[package]]
@@ -368,6 +370,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac9fe6cdbb24b6ade63616c0a0688e45bb56732262c158df3c0c4bea4ca47cb7"
dependencies = [
"find-msvc-tools",
"jobserver",
"libc",
"shlex",
]
@@ -728,6 +732,16 @@ version = "0.1.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "52051878f80a721bb68ebfbc930e07b65ba72f2da88968ea5c06fd6ca3d3a127"
[[package]]
name = "flate2"
version = "1.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bfe33edd8e85a12a67454e37f8c75e730830d83e313556ab9ebf9ee7fbeb3bfb"
dependencies = [
"crc32fast",
"miniz_oxide",
]
[[package]]
name = "flume"
version = "0.11.1"
@@ -1076,6 +1090,16 @@ dependencies = [
"syn",
]
[[package]]
name = "jobserver"
version = "0.1.34"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9afb3de4395d6b3e67a780b6de64b51c978ecf11cb9a462c66be7d4ca9039d33"
dependencies = [
"getrandom 0.3.3",
"libc",
]
[[package]]
name = "js-sys"
version = "0.3.77"
@@ -1235,6 +1259,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1fa76a2c86f704bdb222d66965fb3d63269ce38518b83cb0575fca855ebb6316"
dependencies = [
"adler2",
"simd-adler32",
]
[[package]]
@@ -1965,6 +1990,12 @@ dependencies = [
"libc",
]
[[package]]
name = "simd-adler32"
version = "0.3.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d66dc143e6b11c1eddc06d5c423cfc97062865baf299914ab64caa38182078fe"
[[package]]
name = "slab"
version = "0.4.11"
@@ -2809,6 +2840,34 @@ dependencies = [
"syn",
]
[[package]]
name = "zstd"
version = "0.13.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e91ee311a569c327171651566e07972200e76fcfe2242a4fa446149a3881c08a"
dependencies = [
"zstd-safe",
]
[[package]]
name = "zstd-safe"
version = "7.2.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8f49c4d5f0abb602a93fb8736af2a4f4dd9512e36f7f570d66e65ff867ed3b9d"
dependencies = [
"zstd-sys",
]
[[package]]
name = "zstd-sys"
version = "2.0.16+zstd.1.5.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "91e19ebc2adc8f83e43039e79776e3fda8ca919132d68a1fed6a5faca2683748"
dependencies = [
"cc",
"pkg-config",
]
[[package]]
name = "zvariant"
version = "5.7.0"