Re: [Qemu-devel] [PATCH v2] qga: add mountpoint usage to GuestFilesystemInfo

[Eric Blake <eblake@redhat.com>]

On 05/30/2018 04:01 AM, Chen Hanxiao wrote:
> From: Chen Hanxiao <chenhanxiao@gmail.com>
> 
> This patch adds support for getting the usage of mounted
> filesystem.
> It's very useful when we try to monitor guest's filesystem.
> 
> Cc: Michael Roth <mdroth@linux.vnet.ibm.com>
> Signed-off-by: Chen Hanxiao <chenhanxiao@gmail.com>
> ---
> v2:
>     add description in qapi-schema and version numbers

> +# @usage: file system usage, integer between 0 and 100 (since 3.0)

I still find this as being too imprecise.  Don't throw away data learned 
from the guest that the client might like to know.  Either provide a 
floating point between 0 and 1, or provide the two actual statvfs() 
numbers (used and total) directly and let the client perform the 
division to learn the ratio.

>   # @disk: an array of disk hardware information that the volume lies on,
>   #        which may be empty if the disk type is not supported
>   #
>   # Since: 2.2
>   ##
>   { 'struct': 'GuestFilesystemInfo',
> -  'data': {'name': 'str', 'mountpoint': 'str', 'type': 'str',
> +  'data': {'name': 'str', 'mountpoint': 'str', 'type': 'str', 'usage': 'int',
>              'disk': ['GuestDiskAddress']} }
>   
>   ##
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org