Re: [Qemu-devel] [PATCH v3 0/2] qcow2: Snapshot update for zero clusters

[Kevin Wolf <kwolf@redhat.com>]

Am 30.08.2013 um 10:40 hat Max Reitz geschrieben:
> When creating a snapshots, the refcount adjustment function basically
> adjusted the refcounts of any cluster with a non-zero L2 entry. However,
> the L2 entry of unallocated zero clusters is exactly one (therefore
> non-zero) which led to wrong refcount updates on cluster 0 (the main
> qcow2 header), since the cluster index for these unallocated zero clusters
> is 0.
> 
> This series fixes this by taking all cluster types specifically into
> account using qcow2_get_cluster_type and handling them accordingly.
> Furthermore, a short test is added.
> 
> v3:
>  - forgot 062.out in v2; now added
> 
> v2:
>  - more thorough commit message
>  - take pre-allocated zero clusters into account
>  - abort on unknown cluster type
>  - a test case
> 
> Max Reitz (2):
>   qcow2-refcount: Snapshot update for zero clusters
>   qemu-iotests: Snapshotting zero clusters
> 
>  block/qcow2-refcount.c     | 52 +++++++++++++++++++++++++------------
>  tests/qemu-iotests/062     | 64 ++++++++++++++++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/062.out |  9 +++++++
>  tests/qemu-iotests/group   |  1 +
>  4 files changed, 109 insertions(+), 17 deletions(-)
>  create mode 100755 tests/qemu-iotests/062
>  create mode 100644 tests/qemu-iotests/062.out

Thanks, applied to the block branch.

Kevin