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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.


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