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Re: [Qemu-devel] [PATCH v3 05/15] block: Convert block job core to Block

From: Max Reitz
Subject: Re: [Qemu-devel] [PATCH v3 05/15] block: Convert block job core to BlockBackend
Date: Wed, 25 May 2016 16:51:46 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

On 25.05.2016 14:29, Kevin Wolf wrote:
> This adds a new BlockBackend field to the BlockJob struct, which
> coexists with the BlockDriverState while converting the individual jobs.
> When creating a block job, a new BlockBackend is created on top of the
> given BlockDriverState, and it is destroyed when the BlockJob ends. The
> reference to the BDS is now held by the BlockBackend instead of calling
> bdrv_ref/unref manually.
> We have to be careful when we use bdrv_replace_in_backing_chain() in
> block jobs because this changes the BDS that job->blk points to. At the
> moment block jobs are too tightly coupled with their BDS, so that moving
> a job to another BDS isn't easily possible; therefore, we need to just
> manually undo this change afterwards.
> Signed-off-by: Kevin Wolf <address@hidden>
> Reviewed-by: Eric Blake <address@hidden>
> Reviewed-by: Alberto Garcia <address@hidden>
> ---
>  block/mirror.c           |  3 +++
>  blockjob.c               | 37 ++++++++++++++++++++-----------------
>  include/block/blockjob.h |  3 ++-
>  3 files changed, 25 insertions(+), 18 deletions(-)

Reviewed-by: Max Reitz <address@hidden>

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