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qcow2: rework the cluster compression routine 

The patch enables processing the image compression type defined
for the image and chooses an appropriate method for image clusters
(de)compression.

Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200507082521.29210-3-dplotnikov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Denis Plotnikov 2020-05-07 11:25:19 +03:00 committed by Max Reitz
parent 572ad9783f
commit 25dd077d1d
1 changed files with 60 additions and 11 deletions
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71
block/qcow2-threads.c
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@ -74,7 +74,9 @@ typedef struct Qcow2CompressData {
} Qcow2CompressData;
/*
* qcow2_compress()
* qcow2_zlib_compress()
*
* Compress @src_size bytes of data using zlib compression method
*
* @dest - destination buffer, @dest_size bytes
* @src - source buffer, @src_size bytes
@ -83,8 +85,8 @@ typedef struct Qcow2CompressData {
* -ENOMEM destination buffer is not enough to store compressed data
* -EIO on any other error
*/
static ssize_t qcow2_compress(void *dest, size_t dest_size,
const void *src, size_t src_size)
static ssize_t qcow2_zlib_compress(void *dest, size_t dest_size,
const void *src, size_t src_size)
{
ssize_t ret;
z_stream strm;
@ -119,10 +121,10 @@ static ssize_t qcow2_compress(void *dest, size_t dest_size,
}
/*
* qcow2_decompress()
* qcow2_zlib_decompress()
*
* Decompress some data (not more than @src_size bytes) to produce exactly
* @dest_size bytes.
* @dest_size bytes using zlib compression method
*
* @dest - destination buffer, @dest_size bytes
* @src - source buffer, @src_size bytes
@ -130,8 +132,8 @@ static ssize_t qcow2_compress(void *dest, size_t dest_size,
* Returns: 0 on success
* -EIO on fail
*/
static ssize_t qcow2_decompress(void *dest, size_t dest_size,
const void *src, size_t src_size)
static ssize_t qcow2_zlib_decompress(void *dest, size_t dest_size,
const void *src, size_t src_size)
{
int ret;
z_stream strm;
@ -191,20 +193,67 @@ qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
return arg.ret;
}
/*
* qcow2_co_compress()
*
* Compress @src_size bytes of data using the compression
* method defined by the image compression type
*
* @dest - destination buffer, @dest_size bytes
* @src - source buffer, @src_size bytes
*
* Returns: compressed size on success
* a negative error code on failure
*/
ssize_t coroutine_fn
qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
const void *src, size_t src_size)
{
return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
qcow2_compress);
BDRVQcow2State *s = bs->opaque;
Qcow2CompressFunc fn;
switch (s->compression_type) {
case QCOW2_COMPRESSION_TYPE_ZLIB:
fn = qcow2_zlib_compress;
break;
default:
abort();
}
return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, fn);
}
/*
* qcow2_co_decompress()
*
* Decompress some data (not more than @src_size bytes) to produce exactly
* @dest_size bytes using the compression method defined by the image
* compression type
*
* @dest - destination buffer, @dest_size bytes
* @src - source buffer, @src_size bytes
*
* Returns: 0 on success
* a negative error code on failure
*/
ssize_t coroutine_fn
qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
const void *src, size_t src_size)
{
return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
qcow2_decompress);
BDRVQcow2State *s = bs->opaque;
Qcow2CompressFunc fn;
switch (s->compression_type) {
case QCOW2_COMPRESSION_TYPE_ZLIB:
fn = qcow2_zlib_decompress;
break;
default:
abort();
}
return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, fn);
}