[pve-devel] [PATCH qemu 3/3] blockdev: query file child QMP command

[Fiona Ebner]

Am 30.06.25 um 14:43 schrieb Fabian Grünbichler:
> On June 26, 2025 6:04 pm, Fiona Ebner wrote:
>> There currently does not seem to be a good way to obtain information
>> about the file child of a node, so add a custom command. The
>> query-block and query-named-block-nodes commands lack the necessary
>> info and while x-debug-query-block-graph exists, that is explicitly
>> only for debugging and experimental.
>>
>> This is requried for e.g. blockdev-mirror in PVE to determine the
>> node below the top throttle node.
>>
>> Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
>> ---
>>
>> Alternatively, we could think about adding the node name of the file
>> child to the info returned by query-named-block-nodes. I can give that
>> a shot and also ask upstream which approach is prefered.
> 
> that might be nice, or alternatively if we go with our custom solution
> here for now - give it a prefixed name to avoid potential clashes with a
> future upstream variant?

Since the variant mentioned here is much nicer for the
unplug-after-mirror scenario and seems quite natural, I'll go with that:

https://lore.kernel.org/qemu-devel/20250630141421.1558724-1-f.ebner@proxmox.com/