libnvdimm: blk labels and namespace instantiation

A blk label set describes a namespace comprised of one or more
discontiguous dpa ranges on a single dimm.  They may alias with one or
more pmem interleave sets that include the given dimm.

This is the runtime/volatile configuration infrastructure for sysfs
manipulation of 'alt_name', 'uuid', 'size', and 'sector_size'.  A later
patch will make these settings persistent by writing back the label(s).

Unlike pmem namespaces, multiple blk namespaces can be created per
region.  Once a blk namespace has been created a new seed device
(unconfigured child of a parent blk region) is instantiated.  As long as
a region has 'available_size' != 0 new child namespaces may be created.

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, 15 insertions, 2 deletions

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index b45806f7176d..ac21ce419beb 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -118,7 +118,12 @@ static int is_uuid_busy(struct device *dev, void *data)
 		break;
 	}
 	case ND_DEVICE_NAMESPACE_BLK: {
-		/* TODO: blk namespace support */
+		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+		if (!nsblk->uuid)
+			break;
+		if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) == 0)
+			return -EBUSY;
 		break;
 	}
 	default:
@@ -230,7 +235,7 @@ resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
 				goto retry;
 			}
 		} else if (is_nd_blk(&nd_region->dev)) {
-			/* TODO: BLK Namespace support */
+			available += nd_blk_available_dpa(nd_mapping);
 		}
 	}
 
@@ -360,6 +365,13 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
 			nd_mapping->ndd = NULL;
 			atomic_dec(&nvdimm->busy);
 		}
+	} else if (dev->parent && is_nd_blk(dev->parent) && probe) {
+		struct nd_region *nd_region = to_nd_region(dev->parent);
+
+		nvdimm_bus_lock(dev);
+		if (nd_region->ns_seed == dev)
+			nd_region_create_blk_seed(nd_region);
+		nvdimm_bus_unlock(dev);
 	}
 }
 
@@ -533,6 +545,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
 	nd_region->ndr_mappings = ndr_desc->num_mappings;
 	nd_region->provider_data = ndr_desc->provider_data;
 	nd_region->nd_set = ndr_desc->nd_set;
+	ida_init(&nd_region->ns_ida);
 	dev = &nd_region->dev;
 	dev_set_name(dev, "region%d", nd_region->id);
 	dev->parent = &nvdimm_bus->dev;