Re: [Qemu-devel] [PATCH for-2.7 v2 03/17] blockdev: Add and parse "lock-image" option for block devices

["Denis V. Lunev" <den@openvz.org>]

On 04/15/2016 06:27 AM, Fam Zheng wrote:
> Honor the locking switch specified in CLI or QMP, and set the open flags for
> the image accordingly.
>
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>   blockdev.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
>
> diff --git a/blockdev.c b/blockdev.c
> index f1f520a..93bd43e 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -382,6 +382,10 @@ static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
>                  return;
>               }
>           }
> +
> +        if (!qemu_opt_get_bool(opts, "lock-image", false)) {
> +            *bdrv_flags |= BDRV_O_NO_LOCK;
> +        }
>       }
>   
>       /* disk I/O throttling */
> @@ -4249,6 +4253,10 @@ QemuOptsList qemu_common_drive_opts = {
>               .type = QEMU_OPT_BOOL,
>               .help = "whether to account for failed I/O operations "
>                       "in the statistics",
> +        },{
> +            .name = "lock-image",
> +            .type = QEMU_OPT_BOOL,
> +            .help = "whether to lock the image (default: on)",
>           },
>           { /* end of list */ }
>       },
should you add proper clause into qmp-commands.hx?