static int del_labels()

in label.c [1335:1378]

• 37 lines of code
• 6 McCabe index (conditional complexity)

static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
{
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
	struct nd_label_ent *label_ent, *e;
	struct nd_namespace_index *nsindex;
	unsigned long *free;
	LIST_HEAD(list);
	u32 nslot, slot;
	int active = 0;

	if (!uuid)
		return 0;

	/* no index || no labels == nothing to delete */
	if (!preamble_next(ndd, &nsindex, &free, &nslot))
		return 0;

	mutex_lock(&nd_mapping->lock);
	list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
		struct nd_namespace_label *nd_label = label_ent->label;

		if (!nd_label)
			continue;
		active++;
		if (!nsl_uuid_equal(ndd, nd_label, uuid))
			continue;
		active--;
		slot = to_slot(ndd, nd_label);
		nd_label_free_slot(ndd, slot);
		dev_dbg(ndd->dev, "free: %d\n", slot);
		list_move_tail(&label_ent->list, &list);
		label_ent->label = NULL;
	}
	list_splice_tail_init(&list, &nd_mapping->labels);

	if (active == 0) {
		nd_mapping_free_labels(nd_mapping);
		dev_dbg(ndd->dev, "no more active labels\n");
	}
	mutex_unlock(&nd_mapping->lock);

	return nd_label_write_index(ndd, ndd->ns_next,
			nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
}