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Re: [Qemu-devel] [PATCH v6 08/24] qcow2: Helper function for refcount mo

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v6 08/24] qcow2: Helper function for refcount modification
Date: Wed, 11 Feb 2015 11:38:52 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

On 02/10/2015 01:28 PM, Max Reitz wrote:
> Since refcounts do not always have to be a uint16_t, all refcount blocks
> and arrays in memory should not have a specific type (thus they become
> pointers to void) and for accessing them, two helper functions are used
> (a getter and a setter). Those functions are called indirectly through
> function pointers in the BDRVQcowState so they may later be exchanged
> for different refcount orders.
> With the check and repair functions using this function, the refcount
> array they are creating will be in big endian byte order; additionally,
> using realloc_refcount_array() makes the size of this refcount array
> always cluster-aligned. Both combined allow rebuild_refcount_structure()
> to drop the bounce buffer which was used to convert parts of the
> refcount array to big endian byte order and store them on disk. Instead,
> those parts can now be written directly.
> Signed-off-by: Max Reitz <address@hidden>
> ---
>  block/qcow2-refcount.c | 126 
> ++++++++++++++++++++++++++++---------------------
>  block/qcow2.h          |   8 ++++
>  2 files changed, 81 insertions(+), 53 deletions(-)

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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