libnvdimm for 4.10

* Dynamic label support: To date namespace label support has been
limited to disambiguating cases where PMEM (direct load/store) and BLK
(mmio aperture) accessed-capacity alias on the same DIMM. Since 4.9 added
support for multiple namespaces per PMEM-region there is value to
support namespace labels even in the non-aliasing case. The presence of
a valid namespace index block force-enables label support when the
kernel would otherwise rely on region boundaries, and permits the region
to be sub-divided.

* Handle media errors in namespace metadata: Complement the error
handling for media errors in namespace data areas with support for
clearing errors on writes, and downgrading potential machine-check
exceptions to simple i/o errors on read.

* Device-DAX region attributes: Add 'align', 'id', and 'size' as
attributes for device-dax regions. In particular this enables userspace
tooling to generically size memory mapping and i/o operations. Prevent
userspace from growing assumptions / dependencies about the parent
device topology for a dax region. A libnvdimm namespace may not always
be the parent device of a dax region.

* Various cleanups and small fixes.
-----BEGIN PGP SIGNATURE-----
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=YWfP
-----END PGP SIGNATURE-----