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Re: [Qemu-devel] [PATCH 09/34] block: Add BlockDriverState.inherits_from
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] [PATCH 09/34] block: Add BlockDriverState.inherits_from |
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Date: |
Fri, 08 May 2015 17:39:03 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 05/08/2015 11:21 AM, Kevin Wolf wrote:
> Currently, the block layer assumes that any block node can have only one
> parent, and if it has a parent, that it inherits some options/flags from
> this parent.
>
> This is not true any more: With references used in block device
> creation, a single node can be used by multiple parents, or it can be
> created separately and not inherit flags from any parent.
>
> To handle reopens correctly, a node must know from which parent it
> inherited options. This patch adds the information to BlockDriverState.
>
> Signed-off-by: Kevin Wolf <address@hidden>
> ---
> block.c | 17 +++++++++++++++++
> include/block/block_int.h | 4 ++++
> 2 files changed, 21 insertions(+)
>
Reviewed-by: Eric Blake <address@hidden>
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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[Qemu-devel] [PATCH 06/34] block: Use QemuOpts in bdrv_open_common(), Kevin Wolf, 2015/05/08
[Qemu-devel] [PATCH 09/34] block: Add BlockDriverState.inherits_from, Kevin Wolf, 2015/05/08
[Qemu-devel] [PATCH 10/34] block: Fix reopen flag inheritance, Kevin Wolf, 2015/05/08
[Qemu-devel] [PATCH 07/34] block: Move flag inheritance to bdrv_open_inherited(), Kevin Wolf, 2015/05/08
[Qemu-devel] [PATCH 08/34] block: Add list of children to BlockDriverState, Kevin Wolf, 2015/05/08