drivers/nvdimm/namespace_devs.c

Source file repositories/reference/linux-study-clean/drivers/nvdimm/namespace_devs.c

File Facts

System
Linux kernel
Corpus path
drivers/nvdimm/namespace_devs.c
Extension
.c
Size
56294 bytes
Lines
2232
Domain
Driver Families
Bucket
drivers/nvdimm
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (is_namespace_pmem(&ndns->dev)) {
			struct nd_namespace_pmem *nspm;

			nspm = to_nd_namespace_pmem(&ndns->dev);
			nsidx = nspm->id;
		}

		if (nsidx)
			sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
					suffix ? suffix : "");
		else
			sprintf(name, "pmem%d%s", nd_region->id,
					suffix ? suffix : "");
	} else {
		return NULL;
	}

	return name;
}
EXPORT_SYMBOL(nvdimm_namespace_disk_name);

const uuid_t *nd_dev_to_uuid(struct device *dev)
{
	if (dev && is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

		return nspm->uuid;
	}
	return &uuid_null;
}
EXPORT_SYMBOL(nd_dev_to_uuid);

static ssize_t nstype_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev->parent);

	return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
}
static DEVICE_ATTR_RO(nstype);

static ssize_t __alt_name_store(struct device *dev, const char *buf,
		const size_t len)
{
	char *input, *pos, *alt_name, **ns_altname;
	ssize_t rc;

	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

		ns_altname = &nspm->alt_name;
	} else
		return -ENXIO;

	if (dev->driver || to_ndns(dev)->claim)
		return -EBUSY;

	input = kstrndup(buf, len, GFP_KERNEL);
	if (!input)
		return -ENOMEM;

	pos = strim(input);
	if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
		rc = -EINVAL;
		goto out;
	}

	alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
	if (!alt_name) {
		rc = -ENOMEM;
		goto out;
	}
	kfree(*ns_altname);
	*ns_altname = alt_name;
	sprintf(*ns_altname, "%s", pos);
	rc = len;

out:
	kfree(input);
	return rc;
}

static int nd_namespace_label_update(struct nd_region *nd_region,
		struct device *dev)
{
	dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
			"namespace must be idle during label update\n");
	if (dev->driver || to_ndns(dev)->claim)
		return 0;

Annotation

Implementation Notes