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libnvdimm/region: Introduce NDD_LABELING

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The NDD_ALIASING flag is used to indicate where pmem capacity might
alias with blk capacity and require labeling. It is also used to
indicate whether the DIMM supports labeling. Separate this latter
capability into its own flag so that the NDD_ALIASING flag is scoped to
true aliased configurations.

To my knowledge aliased configurations only exist in the ACPI spec,
there are no known platforms that ship this support in production.

This clarity allows namespace-capacity alignment constraints around
interleave-ways to be relaxed.

Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/158041477856.3889308.4212605617834097674.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2020-01-30 12:06:18 -08:00
parent 6acd7d5ef2
commit a0e374525d
8 changed files with 19 additions and 14 deletions
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2
include/linux/libnvdimm.h
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@ -37,6 +37,8 @@ enum {
NDD_WORK_PENDING = 4,
/* ignore / filter NSLABEL_FLAG_LOCAL for this DIMM, i.e. no aliasing */
NDD_NOBLK = 5,
/* dimm supports namespace labels */
NDD_LABELING = 6,
/* need to set a limit somewhere, but yes, this is likely overkill */
ND_IOCTL_MAX_BUFLEN = SZ_4M,