Re: [Qemu-devel] [PATCH] qed: make qed_alloc_clusters round up offset to nearest cluster

[Stefan Hajnoczi]

On Mon, Aug 15, 2011 at 07:16:10PM -0400, Devin Nakamura wrote:
> @@ -263,6 +263,8 @@ static int qed_read_string(BlockDriverState *file, 
> uint64_t offset, size_t n,
>   */
>  static uint64_t qed_alloc_clusters(BDRVQEDState *s, unsigned int n)
>  {
> +    s->file_size =  qed_start_of_cluster(s, s->file_size +
> +                                         s->header.cluster_size - 1);

Why do you need this?  QED cluster aligns the file size on open.
file_size should always be cluster-aligned.

Stefan