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Re: [Qemu-devel] [PATCH v2 3/7] block: implement reference count for Blo


From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH v2 3/7] block: implement reference count for BlockDriverState
Date: Tue, 30 Jul 2013 14:16:08 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7

Am 30.07.2013 09:52, schrieb Fam Zheng:
> Introduce bdrv_ref/bdrv_unref to manage the lifecycle of
> BlockDriverState. They are unused for now but will used to replace
> bdrv_delete() later.
> 
> Signed-off-by: Fam Zheng <address@hidden>
> ---
>  block.c                   | 22 ++++++++++++++++++++++
>  include/block/block.h     |  2 ++
>  include/block/block_int.h |  1 +
>  3 files changed, 25 insertions(+)

Didn't Kevin and Markus look into turning BlockDriverState into QOM
objects a while back? That would give you reference counting for free,
even atomic unlike this patch.

MemoryRegion resorted to reference counting on the owner object that was
added for the purpose.

Regards,
Andreas

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