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libnvdimm: fix namespace seed creation

Message ID 20150725165106.5010.11133.stgit@dwillia2-desk3.amr.corp.intel.com (mailing list archive)
State Accepted
Commit 8ca243536d21
Headers show

Commit Message

Dan Williams July 25, 2015, 4:51 p.m. UTC
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>
 drivers/nvdimm/region_devs.c |    5 +++++
 1 file changed, 5 insertions(+)
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diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index a5233422f9dc..7384455792bf 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -458,10 +458,15 @@  static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
 	if (is_nd_btt(dev) && probe) {
+		struct nd_btt *nd_btt = to_nd_btt(dev);
 		nd_region = to_nd_region(dev->parent);
 		if (nd_region->btt_seed == dev)
+		if (nd_region->ns_seed == &nd_btt->ndns->dev &&
+				is_nd_blk(dev->parent))
+			nd_region_create_blk_seed(nd_region);