Re: [Qemu-devel] [PATCH 3/4] qemu-nbd: add doc for internal snapshot export

[Stefan Hajnoczi <stefanha@gmail.com>]

On Wed, Jul 17, 2013 at 10:03:54PM +0800, Wenchao Xia wrote:
> Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
> ---
>  qemu-nbd.c    |    2 ++
>  qemu-nbd.texi |    3 +++
>  2 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/qemu-nbd.c b/qemu-nbd.c
> index 46be2b2..8eeee33 100644
> --- a/qemu-nbd.c
> +++ b/qemu-nbd.c
> @@ -80,6 +80,8 @@ static void usage(const char *name)
>  "Block device options:\n"
>  "  -r, --read-only      export read-only\n"
>  "  -s, --snapshot       use snapshot file\n"
> +"  -l, --snapshot-load  temporarily load an internal snapshot and export it as\n"
> +"                       an read-only device, format is 'id=[ID],name=[NAME]'\n"

Does it really export it read-only?  I think you'll get an error unless
you pass qemu-nbd --read-only.