[libvirt] [PATCH v2 1/2] qemu: don't log error for missing optional storage sources on stats

[John Ferlan]

On 12/13/18 6:02 AM, Nikolay Shirokovskiy wrote:
> Every time we call all domain stats for inactive domain with
> unavailable storage source we get error message in logs [1]. It's a bit noisy.
> While it's arguable whether we need such message or not for mandatory
> disks we would like not to see messages for optional disks. Let's
> filter at least for cases of local files. Fixing other cases would
> require passing flag down the stack to .backendInit of storage
> which is ugly.
> 
> Stats for active domain are fine because we either drop disks
> with unavailable sources or clean source which is handled
> by virStorageSourceIsEmpty in qemuDomainGetStatsOneBlockFallback.
> 
> We have these logs for successful stats since 25aa7035d (version 1.2.15)
> which in turn fixes 596a13713 (version 1.2.12 )which added substantial
> stats for offline disks.
> 
> [1] error message example:
> qemuOpenFileAs:3324 : Failed to open file '/path/to/optional/disk': No such file or directory
> 
> Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy at virtuozzo.com>
> ---
>  src/qemu/qemu_domain.c |  9 +++++++++
>  src/qemu/qemu_domain.h |  3 +++
>  src/qemu/qemu_driver.c | 14 ++++++++++++++
>  3 files changed, 26 insertions(+)
> 

Reviewed-by: John Ferlan <jferlan at redhat.com>

John