On 08/30/2013 06:34 AM, Max Reitz wrote:
> Two new functions are added; the first one checks a given range in the
> image file for overlaps with metadata (main header, L1 tables, L2
> tables, refcount table and blocks).
> 
> The second one should be used immediately before writing to the image
> file as it calls the first function and, upon collision, marks the
> image as corrupt and makes the BDS unusable, thereby preventing
> further access.
> 
> Both functions take a bitmask argument specifying the structures which
> should be checked for overlaps, making it possible to also check
> metadata writes against colliding with other structures.
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  block/qcow2-refcount.c    | 172 ++++++++++++++++++++++++++++++++++++++++++++++
>  block/qcow2.h             |  39 +++++++++++
>  include/monitor/monitor.h |   1 +
>  monitor.c                 |   1 +
>  4 files changed, 213 insertions(+)

I know this is already in the QMP queue, but...

> +++ b/include/monitor/monitor.h
> @@ -48,6 +48,7 @@ typedef enum MonitorEvent {
>      QEVENT_BALLOON_CHANGE,
>      QEVENT_SPICE_MIGRATE_COMPLETED,
>      QEVENT_GUEST_PANICKED,
> +    QEVENT_BLOCK_IMAGE_CORRUPTED,
>  
>      /* Add to 'monitor_event_names' array in monitor.c when
>       * defining new events here */
> diff --git a/monitor.c b/monitor.c
> index ee9744c..2c542e1 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -504,6 +504,7 @@ static const char *monitor_event_names[] = {
>      [QEVENT_BALLOON_CHANGE] = "BALLOON_CHANGE",
>      [QEVENT_SPICE_MIGRATE_COMPLETED] = "SPICE_MIGRATE_COMPLETED",
>      [QEVENT_GUEST_PANICKED] = "GUEST_PANICKED",
> +    [QEVENT_BLOCK_IMAGE_CORRUPTED] = "BLOCK_IMAGE_CORRUPTED",
>  };

You are missing documentation for this new event.  Please provide a
followup patch to qmp-events.txt.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org