Quoting Oren Laadan (orenl@xxxxxxxxxxxxxxx):
> +/**
> + * checkpoint_obj - if not already in hash, add object and checkpoint
> + * @ctx: checkpoint context
> + * @ptr: pointer to object
> + * @type: object type
> + *
> + * Look up the object pointed to by @ptr in the hash table. If it
> + * isn't already there, then add the object to the table, allocate a
> + * fresh unique id (objref) and save the object's state, and grab a
> + * reference to every object that is added. (Maintain the reference
> + * until the entire hash is free).
> + *
> + * [This is used during checkpoint].
> + *
> + * Returns: objref
> + */
> +int checkpoint_obj(struct ckpt_ctx *ctx, void *ptr, enum obj_type type)
> +{
> + struct ckpt_obj_ops *ops = &ckpt_obj_ops[type];
> + struct ckpt_hdr_objref *h;
> + struct ckpt_obj *obj;
> + int objref, ret;
> +
> + /* make sure we don't change this accidentally */
> + BUG_ON(ops->obj_type != type);
> +
> + obj = obj_find_by_ptr(ctx, ptr);
> + if (obj) {
> + BUG_ON(obj->ops->obj_type != type);
> + return obj->objref;
> + }
> +
> + h = ckpt_hdr_get_type(ctx, sizeof(*h), CKPT_HDR_OBJREF);
> + if (!h)
> + return -ENOMEM;
> +
> + objref = obj_new(ctx, ptr, 0, ops);
> + if (objref < 0)
ckpt_hdr_put(ctx, h); ?
> + return objref;
> +
> + h->objtype = type;
> + h->objref = objref;
> + ret = ckpt_write_obj(ctx, (struct ckpt_hdr *) h);
> + ckpt_hdr_put(ctx, h);
-serge
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