On 2018-08-28 15:26, Alberto Garcia wrote:
> On Thu 09 Aug 2018 11:35:02 PM CEST, Max Reitz wrote:
>> + backing_overridden = bdrv_backing_overridden(bs);
>> +
>> + if (bs->open_flags & BDRV_O_NO_IO) {
>> + /* Without I/O, the backing file does not change anything.
>> + * Therefore, in such a case (primarily qemu-img), we can
>> + * pretend the backing file has not been overridden even if
>> + * it technically has been. */
>> + backing_overridden = false;
>> + }
>
> What is this for?
qemu-img info opens files with BDRV_O_NO_BACKING. Without this check,
you'd get a json:{} filename with "backing": null.
Max
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