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Re: [PATCH v9 15/34] qcow2: Add qcow2_get_subcluster_range_type()
From: |
Max Reitz |
Subject: |
Re: [PATCH v9 15/34] qcow2: Add qcow2_get_subcluster_range_type() |
Date: |
Wed, 1 Jul 2020 15:37:46 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 |
On 28.06.20 13:02, Alberto Garcia wrote:
> There are situations in which we want to know how many contiguous
> subclusters of the same type there are in a given cluster. This can be
> done by simply iterating over the subclusters and repeatedly calling
> qcow2_get_subcluster_type() for each one of them.
>
> However once we determined the type of a subcluster we can check the
> rest efficiently by counting the number of adjacent ones (or zeroes)
> in the bitmap. This is what this function does.
>
> Signed-off-by: Alberto Garcia <berto@igalia.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> ---
> block/qcow2-cluster.c | 51 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 51 insertions(+)
Reviewed-by: Max Reitz <mreitz@redhat.com>
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