[PATCH 4/4] qemuDomainGetStatsBlockExportDisk: Report stats also for helper images

[Nir Soffer]

On Mon, Nov 1, 2021 at 4:48 PM Peter Krempa <pkrempa at redhat.com> wrote:
>
> Add stat entries also for the mirror destination and the backup job
> scratch/target file. This is possible with '-blockdev' as we use unique
> index for the entries.

I wanted to ask about getting the allocation for mirror target disk and I see
you already handle it, thanks!

> The stats are reported when the VIR_CONNECT_GET_ALL_DOMAINS_STATS_BACKING
> is used.
>
> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2017928
> Signed-off-by: Peter Krempa <pkrempa at redhat.com>
> ---
>  src/qemu/qemu_driver.c | 61 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 61 insertions(+)
>
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 70b5f37e6b..7d13ae9754 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -113,6 +113,7 @@
>  #include "virdomaincheckpointobjlist.h"
>  #include "virsocket.h"
>  #include "virutil.h"
> +#include "backup_conf.h"
>
>  #define VIR_FROM_THIS VIR_FROM_QEMU
>
> @@ -18453,6 +18454,66 @@ qemuDomainGetStatsBlockExportDisk(virDomainDiskDef *disk,
>              break;
>      }
>
> +    /* in blockdev mode where we can properly and uniquely identify images we
> +     * can also report stats for the mirror target or the scratch image or target
> +     * of a backup operation */
> +    if (visitBacking && blockdev) {
> +        qemuDomainObjPrivate *priv = dom->privateData;
> +
> +        if (disk->mirror &&
> +            disk->mirrorJob == VIR_DOMAIN_BLOCK_JOB_TYPE_COPY) {
> +            if (qemuDomainGetStatsBlockExportHeader(disk, disk->mirror, *recordnr, params) < 0)
> +                return -1;
> +
> +            if (qemuDomainGetStatsOneBlock(driver, cfg, dom, params,
> +                                           disk->mirror->nodeformat,
> +                                           disk->mirror,
> +                                           *recordnr,
> +                                           stats) < 0)
> +                return -1;
> +
> +            if (qemuDomainGetStatsBlockExportBackendStorage(disk->mirror->nodestorage,
> +                                                            stats, *recordnr,
> +                                                            params) < 0)
> +                return -1;
> +
> +            (*recordnr)++;
> +        }
> +
> +        if (priv->backup) {
> +            size_t i;
> +
> +            for (i = 0; i < priv->backup->ndisks; i++) {
> +                virDomainBackupDiskDef *backupdisk = priv->backup->disks + i;
> +
> +                if (STRNEQ(disk->dst, priv->backup->disks[i].name))
> +                    continue;
> +
> +                if (backupdisk->store) {
> +                    if (qemuDomainGetStatsBlockExportHeader(disk, backupdisk->store,
> +                                                            *recordnr, params) < 0)
> +                        return -1;
> +
> +                    if (qemuDomainGetStatsOneBlock(driver, cfg, dom, params,
> +                                                   backupdisk->store->nodeformat,
> +                                                   backupdisk->store,
> +                                                   *recordnr,
> +                                                   stats) < 0)
> +                        return -1;
> +
> +                    if (qemuDomainGetStatsBlockExportBackendStorage(backupdisk->store->nodestorage,
> +                                                                    stats, *recordnr,
> +                                                                    params) < 0)
> +                        return -1;
> +
> +                    (*recordnr)++;
> +                }
> +
> +                break;
> +            }
> +        }
> +    }
> +
>      return 0;
>  }
>
> --
> 2.31.1
>