static umode_t region_visible()

in region_devs.c [652:704]

• 42 lines of code
• 22 McCabe index (conditional complexity)

static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, typeof(*dev), kobj);
	struct nd_region *nd_region = to_nd_region(dev);
	struct nd_interleave_set *nd_set = nd_region->nd_set;
	int type = nd_region_to_nstype(nd_region);

	if (!is_memory(dev) && a == &dev_attr_pfn_seed.attr)
		return 0;

	if (!is_memory(dev) && a == &dev_attr_dax_seed.attr)
		return 0;

	if (!is_memory(dev) && a == &dev_attr_badblocks.attr)
		return 0;

	if (a == &dev_attr_resource.attr && !is_memory(dev))
		return 0;

	if (a == &dev_attr_deep_flush.attr) {
		int has_flush = nvdimm_has_flush(nd_region);

		if (has_flush == 1)
			return a->mode;
		else if (has_flush == 0)
			return 0444;
		else
			return 0;
	}

	if (a == &dev_attr_persistence_domain.attr) {
		if ((nd_region->flags & (BIT(ND_REGION_PERSIST_CACHE)
					| BIT(ND_REGION_PERSIST_MEMCTRL))) == 0)
			return 0;
		return a->mode;
	}

	if (a == &dev_attr_align.attr)
		return a->mode;

	if (a != &dev_attr_set_cookie.attr
			&& a != &dev_attr_available_size.attr)
		return a->mode;

	if ((type == ND_DEVICE_NAMESPACE_PMEM
				|| type == ND_DEVICE_NAMESPACE_BLK)
			&& a == &dev_attr_available_size.attr)
		return a->mode;
	else if (is_memory(dev) && nd_set)
		return a->mode;

	return 0;
}