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qcow2: Allow >4 GB VM state
This is a compatible extension to the snapshot header format that allowssaving a 64 bit VM state size.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
qcow2: fix some errors and typo in qcow2.txt
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Add qcow2 documentation
This adds a description of the qcow2 file format to the docs/ directory.Besides documenting what's there, which is never wrong, the document shouldprovide a good basis for the discussion of format extensions (called "qcow3" in previous discussions)...