From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
To: Eric Blake <eblake@redhat.com>, Kevin Wolf <kwolf@redhat.com>
Cc: Nir Soffer <nsoffer@redhat.com>,
QEMU Developers <qemu-devel@nongnu.org>,
"open list:Block layer core" <qemu-block@nongnu.org>,
Markus Armbruster <armbru@redhat.com>,
Max Reitz <mreitz@redhat.com>
Subject: Re: [PATCH v2 2/1] qemu-img: Add "backing":true to unallocated map segments
Date: Tue, 29 Jun 2021 10:23:42 +0300 [thread overview]
Message-ID: <a22c25e6-e44a-7be6-f173-ddff8da7551b@virtuozzo.com> (raw)
In-Reply-To: <20210628174216.25ybfzmtbiymgd6s@redhat.com>
28.06.2021 20:42, Eric Blake wrote:
> On Wed, Jun 23, 2021 at 06:04:19PM +0200, Kevin Wolf wrote:
>>> This is fine, but it means that this flag will present in all ranges,
>>> instead of only in unallocated ranges (what this patch is doing).
>>
>> An argument for always having the flag would be that it's probably
>> useful for a tool to know whether a given block is actually absent or
>> whether it's just running an old qemu-img.
>>
>> If we didn't care about this, I would still define the actual value, but
>> also document a default.
>
> So to summarize, it looks like my v3 will have the best chance of
> approval if I go with always outputting the new field (instead of only
> on one of its two boolean values), and put it at the end of the JSON
> output. It also looks like we have consensus on spelling the new
> field "present":true for data found in the backing chain, and
> "present":false for places where we would defer to another file if a
> backing file is later added.
>
I didn't follow the discussion carefully, but that sounds good to me.
What's the decision about patch 1?
--
Best regards,
Vladimir
next prev parent reply other threads:[~2021-06-29 7:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-11 14:01 [PATCH v2] qemu-img: Make unallocated part of backing chain obvious in map Eric Blake
2021-06-11 14:35 ` Vladimir Sementsov-Ogievskiy
2021-06-11 14:59 ` Eric Blake
2021-06-11 18:13 ` Nir Soffer
2021-06-11 19:03 ` [PATCH v2 2/1] qemu-img: Add "backing":true to unallocated map segments Eric Blake
2021-06-15 8:54 ` Vladimir Sementsov-Ogievskiy
2021-06-15 13:09 ` Nir Soffer
2021-06-22 15:38 ` Kevin Wolf
2021-06-22 16:56 ` Nir Soffer
2021-06-23 8:57 ` Kevin Wolf
2021-06-23 13:58 ` Nir Soffer
2021-06-23 16:04 ` Kevin Wolf
2021-06-23 16:35 ` Nir Soffer
2021-06-28 17:42 ` Eric Blake
2021-06-29 7:23 ` Vladimir Sementsov-Ogievskiy [this message]
2021-06-29 14:40 ` Kevin Wolf
2021-06-29 15:53 ` Nir Soffer
2021-06-22 17:51 ` Vladimir Sementsov-Ogievskiy
2021-06-22 17:04 ` Nir Soffer
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