Re: [Qemu-devel] [PATCH 3/3] qmp: print real legacy_name for alias property

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Sep 15, 2014 at 10:44:39PM +0800, arei.gonglei@huawei.com wrote:
> From: Gonglei <arei.gonglei@huawei.com>
> 
> In this way, we can get the real legacy_name for
> alias properties, and avoide confusing people because of
> property type. People have no way to know they should
> have a specific format.
> 
>  Example:
> 
> before output:
> 
> virtio-blk-pci.physical_block_size=uint16
> virtio-blk-pci.logical_block_size=uint16
> virtio-blk-pci.drive=str
> 
> after output applied this patch:
> 
> virtio-blk-pci.physical_block_size=blocksize
> virtio-blk-pci.logical_block_size=blocksize
> virtio-blk-pci.drive=drive
> 
> Cc: Stefan Hajnoczi <stefanha@redhat.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Signed-off-by: Gonglei <arei.gonglei@huawei.com>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  qmp.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++---------------------
>  1 file changed, 47 insertions(+), 21 deletions(-)
> 
> diff --git a/qmp.c b/qmp.c
> index c6767c4..9338bd4 100644
> --- a/qmp.c
> +++ b/qmp.c
> @@ -433,6 +433,40 @@ ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
>      return ret;
>  }
>  
> +static bool find_device_property_info(ObjectClass *klass,
> +                                      const char *name,
> +                                      DevicePropertyInfo **info)
> +{
> +    Property *prop;
> +    bool found = false;
> +
> +    for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
> +        if (strcmp(name, prop->name) != 0) {
> +            continue;
> +        }
> +
> +        /*
> +         * TODO Properties without a parser are just for dirty hacks.
> +         * qdev_prop_ptr is the only such PropertyInfo.  It's marked
> +         * for removal.  This conditional should be removed along with
> +         * it.
> +         */
> +        if (!prop->info->set) {
> +            found = true;
> +            goto out;           /* no way to set it, don't show */
> +        }
> +
> +        *info = g_malloc0(sizeof(**info));
> +        (*info)->name = g_strdup(prop->name);
> +        (*info)->type = g_strdup(prop->info->legacy_name ?: prop->info->name);
> +
> +        found = true;
> +        goto out;
> +    }
> +out:
> +    return found;
> +}
> +
>  /* Return a DevicePropertyInfo for a qdev property.
>   *
>   * If a qdev property with the given name does not exist, use the given default
> @@ -442,30 +476,21 @@ ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
>   */
>  static DevicePropertyInfo *make_device_property_info(ObjectClass *klass,
>                                                       const char *name,
> -                                                     const char *default_type)
> +                                                     const char *default_type,
> +                                                     bool is_alias,
> +                                                     Object *target_obj)
>  {
>      DevicePropertyInfo *info;
> -    Property *prop;
> -
> -    do {
> -        for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
> -            if (strcmp(name, prop->name) != 0) {
> -                continue;
> -            }
>  
> -            /*
> -             * TODO Properties without a parser are just for dirty hacks.
> -             * qdev_prop_ptr is the only such PropertyInfo.  It's marked
> -             * for removal.  This conditional should be removed along with
> -             * it.
> -             */
> -            if (!prop->info->set) {
> -                return NULL;           /* no way to set it, don't show */
> -            }
> +    if (is_alias) {
> +        ObjectClass *class = object_get_class(target_obj);
> +        if (find_device_property_info(class, name, &info)) {
> +            return info;
> +        }
> +    }
>  
> -            info = g_malloc0(sizeof(*info));
> -            info->name = g_strdup(prop->name);
> -            info->type = g_strdup(prop->info->legacy_name ?: prop->info->name);
> +    do {
> +        if (find_device_property_info(klass, name, &info)) {
>              return info;
>          }
>          klass = object_class_get_parent(klass);
> @@ -521,7 +546,8 @@ DevicePropertyInfoList *qmp_device_list_properties(const char *typename,
>              continue;
>          }
>  
> -        info = make_device_property_info(klass, prop->name, prop->type);
> +        info = make_device_property_info(klass, prop->name, prop->type,
> +                                         prop->is_alias, prop->target_obj);
>          if (!info) {
>              continue;
>          }
> -- 
> 1.7.12.4
>