[libvirt] [PATCH v1 04/11] qemu: Introduce nbd-server-add command

[Eric Blake]

> This will be used with new migration scheme.
> This patch creates basically just monitor stub
> functions. Wiring them into something useful
> is done in later patches.
> ---
>  src/qemu/qemu_monitor.c      |   21 +++++++++++++++++++++
>  src/qemu/qemu_monitor.h      |    2 ++
>  src/qemu/qemu_monitor_json.c |   23 +++++++++++++++++++++++
>  src/qemu/qemu_monitor_json.h |    2 ++
>  4 files changed, 48 insertions(+), 0 deletions(-)
> 

> +
> +int
> +qemuMonitorJSONNBDServerAdd(qemuMonitorPtr mon,
> +                            const char *deviceID)
> +{
> +    int ret = -1;
> +    virJSONValuePtr cmd;
> +    virJSONValuePtr reply = NULL;
> +
> +    if (!(cmd = qemuMonitorJSONMakeCommand("nbd-server-add",
> +                                           "s:device", deviceID,
> +                                           NULL)))

According to qemu.git, 'writable' is optional, but if omitted, it
defaults to false.  But doesn't storage migration require 'writable'
to be true in order for drive-mirror on the source to be able to
actually write into the destination?

[You may have dealt with this later in the series, but even if so,
I still think this stub should be doing something with "b:writable".]