[libvirt] [PATCHv6 08/11] qemu: bulk stats: add block allocation information

[Eric Blake]

On 09/15/2014 09:42 AM, Peter Krempa wrote:
> From: Francesco Romani <fromani at redhat.com>
> 
> Management software wants to be able to allocate disk space on demand.
> To support this they need keep track of the space occupation of the
> block device.  This information is reported by qemu as part of block
> stats.
> 
> This patch extend the block information in the bulk stats with the
> allocation information.
> 
> To keep the same behaviour a helper is extracted from
> qemuMonitorJSONGetBlockExtent in order to get per-device allocation
> information.
> 
> Signed-off-by: Francesco Romani <fromani at redhat.com>
> ---
>  src/libvirt.c                |  2 +
>  src/qemu/qemu_driver.c       | 18 +++++++++
>  src/qemu/qemu_monitor.h      |  1 +
>  src/qemu/qemu_monitor_json.c | 91 ++++++++++++++++++++++++++++++++++----------
>  4 files changed, 92 insertions(+), 20 deletions(-)
> 
> diff --git a/src/libvirt.c b/src/libvirt.c
> index ab10a3a..a8892a2 100644
> --- a/src/libvirt.c
> +++ b/src/libvirt.c
> @@ -21654,6 +21654,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
>   *                          unsigned long long.
>   * "block.<num>.errors" - Xen only: the 'oo_req' value as
>   *                        unsigned long long.
> + * "block.<num>.allocation" - offset of the highest written sector
> + *                            as unsigned long long.

If we are repeating virDomainGetBlockInfo() here, I'd rather see us
report all 3 pieces of information (allocation, capacity, physical)
instead of just one.

> +typedef enum {
> +    QEMU_MONITOR_BLOCK_EXTENT_ERROR_OK,
> +    QEMU_MONITOR_BLOCK_EXTENT_ERROR_NOPARENT,
> +    QEMU_MONITOR_BLOCK_EXTENT_ERROR_NOSTATS,
> +    QEMU_MONITOR_BLOCK_EXTENT_ERROR_NOOFFSET
> +} qemuMonitorBlockExtentError;

We require C99, so please have a trailing comma in the enum (it makes
adding new elements easier, because they don't have to modify an
existing line).

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

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