VMDK: separate vmdk_read_extent/vmdk_write_extent
Factor out read/write extent code, since there will be more things to take care of once reading/writing compressed clusters is introduced. Signed-off-by: NFam Zheng <famcool@gmail.com> Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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