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Re: [Qemu-devel] [PATCH 09/34] block: Add BlockDriverState.inherits_from

From: Max Reitz
Subject: Re: [Qemu-devel] [PATCH 09/34] block: Add BlockDriverState.inherits_from
Date: Mon, 11 May 2015 17:50:12 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

On 08.05.2015 19:21, 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: Max Reitz <address@hidden>

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