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block: in commit, determine base image from the top image
This simplifies some code and error checking, and also fixes a bug.
bdrv_find_backing_image() should only be passed absolute filenames,or filenames relative to the chain. In the QMP message handler for...
qemu-iotests: add relative backing file tests for block-commit (040)
The previous block commit used absolute filenames for all block-commitimages and commands; this adds relative filenames for the same tests.
Signed-off-by: Jeff Cody <jcody@redhat.com>...
qemu-iotests: add initial tests for live block commit
Derived from the streaming test cases (030), this adds thefollowing 9 tests:
1. For the following image chain, commit [mid] into [backing], and use qemu-io to verify [backing] has its original data, as...