Re: [Qemu-devel] [PATCH v5 1/2] qga: add mountpoint usage to GuestFilesystemInfo

[Eric Blake <eblake@redhat.com>]

On 06/01/2018 10:27 AM, Chen Hanxiao wrote:
> From: Chen Hanxiao <chenhanxiao@gmail.com>
> 
> This patch adds support for getting the usage of mounted
> filesystem.
> The usage of fs stored as used_bytes and total_bytes.
> It's very useful when we try to monitor guest's filesystem.
> 
> Cc: Michael Roth <mdroth@linux.vnet.ibm.com>
> Cc: Eric Blake <eblake@redhat.com>
> Cc: Daniel P. Berrangé <berrange@redhat.com>
> Signed-off-by: Chen Hanxiao <chenhanxiao@gmail.com>
> 

> +++ b/qga/qapi-schema.json
> @@ -840,12 +840,24 @@
>              'bus-type': 'GuestDiskBusType',
>              'bus': 'int', 'target': 'int', 'unit': 'int'} }
>   
> +##
> +# @GuestFsUsage:
> +#
> +# @used-bytes:  file system used bytes
> +# @total-bytes: file system total bytes for nonroot user
> +#
> +# Since: 3.0
> +##
> +{ 'struct': 'GuestFsUsage',
> +  'data': {'used-bytes': 'uint64', 'total-bytes': 'uint64'} }

That seems like pointless nesting on the wire, unless we have plans of 
reusing this type in other API calls.  Is it any easier...

> +
>   ##
>   # @GuestFilesystemInfo:
>   #
>   # @name: disk name
>   # @mountpoint: mount point path
>   # @type: file system type string
> +# @usage: file system usage struct (since 3.0)
>   # @disk: an array of disk hardware information that the volume lies on,
>   #        which may be empty if the disk type is not supported
>   #
> @@ -853,7 +865,7 @@
>   ##
>   { 'struct': 'GuestFilesystemInfo',
>     'data': {'name': 'str', 'mountpoint': 'str', 'type': 'str',
> -           'disk': ['GuestDiskAddress']} }
> +           '*usage': 'GuestFsUsage', 'disk': ['GuestDiskAddress']} }

...to just inline '*used-bytes' and '*total-bytes' here?

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