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qcow2: Implement data-file-raw create option

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Provide an option to force QEMU to always keep the external data file
consistent as a standalone read-only raw image.

At the moment, this means making sure that write_zeroes requests are
forwarded to the data file instead of just updating the metadata, and
checking that no backing file is used.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2019-02-22 14:29:38 +01:00
parent 9b890bdcb6
commit 6c3944dc62
6 changed files with 109 additions and 3 deletions
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1
include/block/block_int.h
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@ -57,6 +57,7 @@
#define BLOCK_OPT_OBJECT_SIZE "object_size"
#define BLOCK_OPT_REFCOUNT_BITS "refcount_bits"
#define BLOCK_OPT_DATA_FILE "data_file"
#define BLOCK_OPT_DATA_FILE_RAW "data_file_raw"
#define BLOCK_PROBE_BUF_SIZE 512