libnvdimm: write blk label set

After 'uuid', 'size', 'sector_size', and optionally 'alt_name' have been
set to valid values the labels on the dimm can be updated.  The
difference with the pmem case is that blk namespaces are limited to one
dimm and can cover discontiguous ranges in dpa space.

Also, after allocating label slots, it is useful for userspace to know
how many slots are left.  Export this information in sysfs.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 53 insertions, 4 deletions

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 546e77e122fd..50b502b1908e 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -163,8 +163,7 @@ static int nd_namespace_label_update(struct nd_region *nd_region,
 	 */
 	if (is_namespace_pmem(dev)) {
 		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
-		struct resource *res = &nspm->nsio.res;
-		resource_size_t size = resource_size(res);
+		resource_size_t size = resource_size(&nspm->nsio.res);
 
 		if (size == 0 && nspm->uuid)
 			/* delete allocation */;
@@ -173,8 +172,15 @@ static int nd_namespace_label_update(struct nd_region *nd_region,
 
 		return nd_pmem_namespace_label_update(nd_region, nspm, size);
 	} else if (is_namespace_blk(dev)) {
-		/* TODO: implement blk labels */
-		return 0;
+		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+		resource_size_t size = nd_namespace_blk_size(nsblk);
+
+		if (size == 0 && nsblk->uuid)
+			/* delete allocation */;
+		else if (!nsblk->uuid || !nsblk->lbasize)
+			return 0;
+
+		return nd_blk_namespace_label_update(nd_region, nsblk, size);
 	} else
 		return -ENXIO;
 }
@@ -986,6 +992,48 @@ static ssize_t sector_size_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(sector_size);
 
+static ssize_t dpa_extents_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nd_region *nd_region = to_nd_region(dev->parent);
+	struct nd_label_id label_id;
+	int count = 0, i;
+	u8 *uuid = NULL;
+	u32 flags = 0;
+
+	nvdimm_bus_lock(dev);
+	if (is_namespace_pmem(dev)) {
+		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+		uuid = nspm->uuid;
+		flags = 0;
+	} else if (is_namespace_blk(dev)) {
+		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+		uuid = nsblk->uuid;
+		flags = NSLABEL_FLAG_LOCAL;
+	}
+
+	if (!uuid)
+		goto out;
+
+	nd_label_gen_id(&label_id, uuid, flags);
+	for (i = 0; i < nd_region->ndr_mappings; i++) {
+		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+		struct resource *res;
+
+		for_each_dpa_resource(ndd, res)
+			if (strcmp(res->name, label_id.id) == 0)
+				count++;
+	}
+ out:
+	nvdimm_bus_unlock(dev);
+
+	return sprintf(buf, "%d\n", count);
+}
+static DEVICE_ATTR_RO(dpa_extents);
+
 static struct attribute *nd_namespace_attributes[] = {
 	&dev_attr_nstype.attr,
 	&dev_attr_size.attr,
@@ -993,6 +1041,7 @@ static struct attribute *nd_namespace_attributes[] = {
 	&dev_attr_resource.attr,
 	&dev_attr_alt_name.attr,
 	&dev_attr_sector_size.attr,
+	&dev_attr_dpa_extents.attr,
 	NULL,
 };