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Subject[GIT PULL] libnvdimm fix for 4.2-rc4
Hi Linus, please pull from...

git:// libnvdimm-fixes receive a minor fix for the libnvdimm subsystem.

This is not critical. The problem can be worked around in userspace by
putting the namespace temporarily into raw mode
(ndctl_namespace_set_raw_mode() from libndctl), but that is awkward for
management utilities. I would consider it a candidate for 4.2-stable if
it does not make 4.2.

The following changes since commit 52721d9d3334c1cb1f76219a161084094ec634dc:

Linux 4.2-rc3 (2015-07-19 14:45:02 -0700)

are available in the git repository at:

git:// libnvdimm-fixes

for you to fetch changes up to 8ca243536d21ae2d08f61b1c5af4ac3d4bb697e4:

libnvdimm: fix namespace seed creation (2015-07-25 09:57:56 -0700)

Dan Williams (1):
libnvdimm: fix namespace seed creation

drivers/nvdimm/region_devs.c | 5 +++++
1 file changed, 5 insertions(+)

commit 8ca243536d21ae2d08f61b1c5af4ac3d4bb697e4
Author: Dan Williams <>
Date: Fri Jul 24 23:42:34 2015 -0400

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 <>
Signed-off-by: Dan Williams <>

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);
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