qcow: Use bdrv functions to replace file operation
Since common file operation functions lack of error detection and use much more I/O syscalls, so change them to bdrv series functions and reduce I/O request. Signed-off-by: NLi Zhi Hui <zhihuili@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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