Re: [Qemu-devel] [PATCH v5 1/2] qom: Add can_be_deleted callback to UserCreatableClass

[Igor Mammedov]

On Sat, 28 Mar 2015 00:55:29 +0800
Lin Ma <address@hidden> wrote:

> If backends implement the can_be_deleted and it returns false,
> Then the qmp_object_del won't delete the given backends.
> 
> Signed-off-by: Lin Ma <address@hidden>
> ---
>  include/qom/object_interfaces.h | 14 ++++++++++++++
>  qmp.c                           |  5 +++++
>  qom/object_interfaces.c         | 14 ++++++++++++++
>  3 files changed, 33 insertions(+)
> 
> diff --git a/include/qom/object_interfaces.h b/include/qom/object_interfaces.h
> index b792283..012b653 100644
> --- a/include/qom/object_interfaces.h
> +++ b/include/qom/object_interfaces.h
> @@ -25,6 +25,8 @@ typedef struct UserCreatable {
>   * UserCreatableClass:
>   * @parent_class: the base class
>   * @complete: callback to be called after @obj's properties are set.
> + * @can_be_deleted: callback to be called before an object is removed
> + * to check if @obj can be removed safely.
>   *
>   * Interface is designed to work with -object/object-add/object_add
>   * commands.
> @@ -47,6 +49,7 @@ typedef struct UserCreatableClass {
>  
>      /* <public> */
>      void (*complete)(UserCreatable *uc, Error **errp);
> +    bool (*can_be_deleted)(UserCreatable *uc, Error **errp);
>  } UserCreatableClass;
>  
>  /**
> @@ -59,4 +62,15 @@ typedef struct UserCreatableClass {
>   * nothing.
>   */
>  void user_creatable_complete(Object *obj, Error **errp);
> +
> +/**
> + * user_creatable_can_be_deleted:
> + * @obj: the object whose can_be_deleted() method is called if defined
s/obj/uc/
s/defined/implemented/

> + * @errp: if an error occurs, a pointer to an area to store the error
> + *
> + * Wrapper to call can_be_deleted() method if one of types it's inherited
> + * from implements USER_CREATABLE interface, otherwise the call does
> + * nothing.
drop ", otherwise the call does nothing"

> +bool user_creatable_can_be_deleted(Object *obj, Error **errp);
[...]
>  
> +bool user_creatable_can_be_deleted(Object *obj, Error **errp)
> +{
> +
> +    UserCreatableClass *ucc;
> +    UserCreatable *uc = USER_CREATABLE(obj);
Function description doesn't match what it does, I mean part
"otherwise the call does nothing."

How about changing prototype to:

bool user_creatable_can_be_deleted(UserCreatable *uc, Error **errp)

and calling it in qmp.c like:
  user_creatable_can_be_deleted(USER_CREATABLE(obj), errp);