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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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10
block/qcow2-cluster.c
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@ -1783,6 +1783,16 @@ int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset,
int64_t cleared;
int ret;
/* If we have to stay in sync with an external data file, zero out
* s->data_file first. */
if (data_file_is_raw(bs)) {
assert(has_data_file(bs));
ret = bdrv_co_pwrite_zeroes(s->data_file, offset, bytes, flags);
if (ret < 0) {
return ret;
}
}
/* Caller must pass aligned values, except at image end */
assert(QEMU_IS_ALIGNED(offset, s->cluster_size));
assert(QEMU_IS_ALIGNED(end_offset, s->cluster_size) ||