static void nvme_update_disk_info()

in host/core.c [1798:1870]

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

static void nvme_update_disk_info(struct gendisk *disk,
		struct nvme_ns *ns, struct nvme_id_ns *id)
{
	sector_t capacity = nvme_lba_to_sect(ns, le64_to_cpu(id->nsze));
	unsigned short bs = 1 << ns->lba_shift;
	u32 atomic_bs, phys_bs, io_opt = 0;

	/*
	 * The block layer can't support LBA sizes larger than the page size
	 * yet, so catch this early and don't allow block I/O.
	 */
	if (ns->lba_shift > PAGE_SHIFT) {
		capacity = 0;
		bs = (1 << 9);
	}

	blk_integrity_unregister(disk);

	atomic_bs = phys_bs = bs;
	nvme_setup_streams_ns(ns->ctrl, ns, &phys_bs, &io_opt);
	if (id->nabo == 0) {
		/*
		 * Bit 1 indicates whether NAWUPF is defined for this namespace
		 * and whether it should be used instead of AWUPF. If NAWUPF ==
		 * 0 then AWUPF must be used instead.
		 */
		if (id->nsfeat & NVME_NS_FEAT_ATOMICS && id->nawupf)
			atomic_bs = (1 + le16_to_cpu(id->nawupf)) * bs;
		else
			atomic_bs = (1 + ns->ctrl->subsys->awupf) * bs;
	}

	if (id->nsfeat & NVME_NS_FEAT_IO_OPT) {
		/* NPWG = Namespace Preferred Write Granularity */
		phys_bs = bs * (1 + le16_to_cpu(id->npwg));
		/* NOWS = Namespace Optimal Write Size */
		io_opt = bs * (1 + le16_to_cpu(id->nows));
	}

	blk_queue_logical_block_size(disk->queue, bs);
	/*
	 * Linux filesystems assume writing a single physical block is
	 * an atomic operation. Hence limit the physical block size to the
	 * value of the Atomic Write Unit Power Fail parameter.
	 */
	blk_queue_physical_block_size(disk->queue, min(phys_bs, atomic_bs));
	blk_queue_io_min(disk->queue, phys_bs);
	blk_queue_io_opt(disk->queue, io_opt);

	/*
	 * Register a metadata profile for PI, or the plain non-integrity NVMe
	 * metadata masquerading as Type 0 if supported, otherwise reject block
	 * I/O to namespaces with metadata except when the namespace supports
	 * PI, as it can strip/insert in that case.
	 */
	if (ns->ms) {
		if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
		    (ns->features & NVME_NS_METADATA_SUPPORTED))
			nvme_init_integrity(disk, ns->ms, ns->pi_type,
					    ns->ctrl->max_integrity_segments);
		else if (!nvme_ns_has_pi(ns))
			capacity = 0;
	}

	set_capacity_and_notify(disk, capacity);

	nvme_config_discard(disk, ns);
	blk_queue_max_write_zeroes_sectors(disk->queue,
					   ns->ctrl->max_zeroes_sectors);

	set_disk_ro(disk, (id->nsattr & NVME_NS_ATTR_RO) ||
		test_bit(NVME_NS_FORCE_RO, &ns->flags));
}