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Re: [PATCH v0 0/2] allow to set 'drive' property on a realized block dev

From: Denis Plotnikov
Subject: Re: [PATCH v0 0/2] allow to set 'drive' property on a realized block device
Date: Mon, 2 Mar 2020 16:55:56 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 02.03.2020 16:38, Kevin Wolf wrote:
Am 10.11.2019 um 20:03 hat Denis Plotnikov geschrieben:
This allows to replace the file on a block device and is useful
to workaround the cases (migration) when the VM image is placed on
some shared storage with exclusive file opening model but the image
should be open form more than one app.

The previous version of approaching the workaround was based on the
"blockdev-change-medium" command modification but had some flaws:
   * semantics: blockdev-change-medium is aimed to be used with removable 
   * interface: it can't accept all possible combination of parameters for
     the "drive" replacement (creation).

More details here: http://patchwork.ozlabs.org/patch/1179329/

The current series suggests another approach:
1. blockdev-add
2. qom-set disk.drive = the blockdev added (this is what the series adds)
Are you still planning to send another version?

Not in the near future :) There is an unresolved problem with bitmap-migration is case of block dev replacement.
Still don't know how to do it in the proper way.


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