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qom: Add can_be_deleted callback to UserCreatableClass

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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 <lma@suse.com>
Message-Id: <1427704589-7688-2-git-send-email-lma@suse.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lin Ma 2015-03-30 16:36:28 +08:00 committed by Paolo Bonzini
parent 033a20359a
commit d6edb15576
3 changed files with 30 additions and 0 deletions
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13
include/qom/object_interfaces.h
View file

@ -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 +62,14 @@ typedef struct UserCreatableClass {
* nothing.
*/
void user_creatable_complete(Object *obj, Error **errp);
/**
* user_creatable_can_be_deleted:
* @uc: the object whose can_be_deleted() method is called if 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.
*/
bool user_creatable_can_be_deleted(UserCreatable *uc, Error **errp);
#endif

5
qmp.c
View file

@ -711,6 +711,11 @@ void qmp_object_del(const char *id, Error **errp)
error_setg(errp, "object id not found");
return;
}
if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
error_setg(errp, "%s is in use, can not be deleted", id);
return;
}
object_unparent(obj);
}

12
qom/object_interfaces.c
View file

@ -18,6 +18,18 @@ void user_creatable_complete(Object *obj, Error **errp)
}
}
bool user_creatable_can_be_deleted(UserCreatable *uc, Error **errp)
{
UserCreatableClass *ucc = USER_CREATABLE_GET_CLASS(uc);
if (ucc->can_be_deleted) {
return ucc->can_be_deleted(uc, errp);
} else {
return true;
}
}
static void register_types(void)
{
static const TypeInfo uc_interface_info = {