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Subjectlibnvdimm fixes 5.9-rc6
Hi Linus, please pull from:

tags/libnvdimm-fixes-5.9-rc6 receive a handful of fixes to address a string of mistakes in
the mechanism for device-mapper to determine if its component devices
are dax capable. You will notice that this branch was rebased this
morning and it has not appeared in -next. I decided to cut short the
soak time because the infinite-recursion regression is currently
crashing anyone attempting to test filesystem-dax in 5.9-rc5+. The
most recent rebase folded in a compile fix reported by the kbuild
robot for the uncommon CONFIG_DAX=m case. It should, "should", be all
good now.


The following changes since commit 856deb866d16e29bd65952e0289066f6078af773:

Linux 5.9-rc5 (2020-09-13 16:06:00 -0700)

are available in the Git repository at:


for you to fetch changes up to d4c5da5049ac27c6ef8f6f98548c3a1ade352d25:

dax: Fix stack overflow when mounting fsdax pmem device (2020-09-20
08:57:36 -0700)

libnvdimm fixes for 5.9-rc6

- Fix an original bug in device-mapper table reference counting when
interrogating dax capability in the component device. This bug was
hidden by the following bug.

- Fix device-mapper to use the proper helper (dax_supported() instead of
the leaf helper generic_fsdax_supported()) to determine dax operation
of a stacked block device configuration. The original implementation
is only valid for one level of dax-capable block device stacking. This
bug was discovered while fixing the below regression.

- Fix an infinite recursion regression introduced by broken attempts to
quiet the generic_fsdax_supported() path and make it bail out before
logging "dax capability not found" errors.

Adrian Huang (1):
dax: Fix stack overflow when mounting fsdax pmem device

Dan Williams (1):
dm/dax: Fix table reference counts

Jan Kara (1):
dm: Call proper helper to determine dax support

drivers/dax/super.c | 16 ++++++++++------
drivers/md/dm-table.c | 10 +++++++---
drivers/md/dm.c | 5 +++--
include/linux/dax.h | 22 ++++++++++++++++++++--
4 files changed, 40 insertions(+), 13 deletions(-)

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