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Re: [Qemu-devel] [PATCH 5/6] block: Fix write/resize permissions for ina
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From: |
Fam Zheng |
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Subject: |
Re: [Qemu-devel] [PATCH 5/6] block: Fix write/resize permissions for inactive images |
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Date: |
Fri, 18 Aug 2017 20:04:20 +0800 |
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User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Fri, 08/18 18:06, Xie Changlong wrote:
> The root casue is when we run replication in secondary, vmstate changes to
> RUN_STATE_INMIGRATE, then blockdev_init() sets bdrv_flags |=
> BDRV_O_INACTIVE. So the whole chain become readonly. I've tried on my side,
> but it seems not easy to fix it. I wonder if there is any way to bypass
> this? Any suggestion would be appreciated.
The non-shared storage migration uses "nbd_server_add -w" at destinition side
where BDRV_O_INACTIVE is set for images like your case, the way it handles it is
by calling bdrv_invalidate_cache(). See nbd_export_new().
See also commit 3dff24f2dffc5f3aa46dc014122012848bd7959d.
I'm not sure if this is enough for block replication?
Fam