Commit 8ca24353 authored Jul 24, 2015 by Dan Williams

libnvdimm: fix namespace seed creation



A new BLK namespace "seed" device is created whenever the current seed
is successfully probed.  However, if that namespace is assigned to a BTT
it may never directly experience a successful probe as it is a
subordinate device to a BTT configuration.

The effect of the current code is that no new namespaces can be
instantiated, after the seed namespace, to consume available BLK DPA
capacity.  Fix this by treating a successful BTT probe event as a
successful probe event for the backing namespace.

Reported-by: Nicholas Moulin <nicholas.w.moulin@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

parent 52721d9d

drivers/nvdimm/region_devs.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -458,10 +458,15 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
		nvdimm_bus_unlock(dev);
		}
		if (is_nd_btt(dev) && probe) {
		struct nd_btt *nd_btt = to_nd_btt(dev);

		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->btt_seed == dev)
		nd_region_create_btt_seed(nd_region);
		if (nd_region->ns_seed == &nd_btt->ndns->dev &&
		is_nd_blk(dev->parent))
		nd_region_create_blk_seed(nd_region);
		nvdimm_bus_unlock(dev);
		}
		}