Re: [PATCH v2 2/2] qemu: don't log error for missing optional storage sources on start

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On 12/13/18 6:02 AM, Nikolay Shirokovskiy wrote:
> Because missing optional storage source is not error. The patch
> address only local files. Fixing other cases is a bit ugly.
> Below is example of error notice in log now:
> 
> error: virStorageFileReportBrokenChain:427 :
>    Cannot access storage file '/path/to/missing/optional/disk':
>   	No such file or directory
> 
> Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@xxxxxxxxxxxxx>
> ---
>  src/qemu/qemu_process.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> index 2f8e19d..d754f09 100644
> --- a/src/qemu/qemu_process.c
> +++ b/src/qemu/qemu_process.c
> @@ -6118,7 +6118,15 @@ qemuProcessPrepareHostStorage(virQEMUDriverPtr driver,
>          if (!blockdev)
>              virStorageSourceBackingStoreClear(disk->src);
>  
> -        if (qemuDomainDetermineDiskChain(driver, vm, disk, true) >= 0)
> +        /*
> +         * Go to applying startup policy for optional disk with nonexistent
> +         * source file immediately as detemining chain will surely fail

determining

> +         * and we don't want noisy error notice in logs for this case.
> +         */
> +        if (qemuDomainDiskIsMissingLocalOptional(disk) && cold_boot)
> +            VIR_INFO("optional disk '%s' source file is missing, "
> +                     "skip checking disk chain", disk->dst);

Perhaps the message here is "less important" (to me at least) than it
was for the stats code, but it's also fine as is...

with the spelling/typo fixed..

Reviewed-by: John Ferlan <jferlan@xxxxxxxxxx>

John


> +        else if (qemuDomainDetermineDiskChain(driver, vm, disk, true) >= 0)
>              continue;
>  
>          if (qemuDomainCheckDiskStartupPolicy(driver, vm, idx, cold_boot) >= 0)
> 

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