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This implements bdrv_co_get_block_status() for VHD images. This can significantly speed up qemu-img convert operation because only with this function implemented sparseness can be considered. (Before, converting a 1 TB empty image took several minutes for me, now it's instantaneous.) Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team
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