Re: [Qemu-devel] [PATCH for-2.6 01/14] block: Add "file" output parameter to block status query functions

[Fam Zheng]

On Mon, 11/23 22:30, Eric Blake wrote:
> On 11/23/2015 10:21 PM, Fam Zheng wrote:
> > The added parameter can be used to return the BDS pointer which the
> > valid offset is refering to. It's value should be ignored unless
> 
> s/refering/referring/
> 
> > BDRV_BLOCK_OFFSET_VALID in ret is set.
> > 
> > Until block drivers fill in the right value, let's clear it explicitly
> > right before calling .bdrv_get_block_status.
> > 
> > Signed-off-by: Fam Zheng <address@hidden>
> > ---
> 
> Reviewed-by: Eric Blake <address@hidden>
> 
> Is there ever going to be a need to expose this through QMP, or is this
> just used for the qemu-img map subcommand?
> 

I don't think QMP has exposure of information in block address level; for now
it is only used by qemu-img map, which has a "json" output format that can be
used by upper layer tools.

Thanks,
Fam