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block: Make essential BlockDriver objects public
There are some block drivers which are essential to QEMU and may not be removed: These are raw, file and qcow2 (as the default non-raw format). Make their BlockDriver objects public so they can be directly referenced throughout the block layer without needing to call bdrv_find_format() and having to deal with an error at runtime, while the real problem occurred during linking (where raw, file or qcow2 were not linked into qemu). Cc: qemu-stable@nongnu.org Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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