Re: [Qemu-devel] [RFC PATCH 0/3] qcow2: Save requests during cluster allocation

[Stefan Hajnoczi]

On Fri, Mar 2, 2012 at 6:48 PM, Kevin Wolf <address@hidden> wrote:
> When a write request spans both allocated and unallocated clusters, qcow2
> splits the request in two parts. This is not necessary if we have sequential
> writes: If the unallocated area can be allocated such that in the image file 
> it
> is adjacent to the already allocated part, a single request is enough.
>
> Kevin Wolf (3):
>  qcow2: Factor out count_cow_clusters
>  qcow2: Add qcow2_alloc_clusters_at()
>  qcow2: Reduce number of I/O requests
>
>  block/qcow2-cluster.c  |  274 
> +++++++++++++++++++++++++++++++++---------------
>  block/qcow2-refcount.c |   28 +++++
>  block/qcow2.h          |    3 +
>  trace-events           |    1 +
>  4 files changed, 222 insertions(+), 84 deletions(-)

Reviewed-by: Stefan Hajnoczi <address@hidden>