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nfit, libnvdimm: deprecate the generic SMART ioctl

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The kernel's ND_IOCTL_SMART_THRESHOLD command is based on a payload
definition that has become broken / out-of-sync with recent versions of
the NVDIMM_FAMILY_INTEL definition. Deprecate the use of the
ND_IOCTL_SMART_THRESHOLD command in favor of the ND_CMD_CALL approach
taken by NVDIMM_FAMILY_{HPE,MSFT}, where we can manage the per-vendor
variance in userspace.

In a couple years, when the new scheme is widely deployed in userspace
packages, the ND_IOCTL_SMART_THRESHOLD support can be removed. For now
we prevent new binaries from compiling against the kernel header
definitions, but kernel still compatible with old binaries. The
libndctl.h [1] header is now the authoritative interface definition for
NVDIMM SMART.

[1]: https://github.com/pmem/ndctl
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2017-11-17 16:23:08 -08:00
commit cdd77d3e19
4 changed files with 84 additions and 71 deletions
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3
drivers/nvdimm/bus.c
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@ -1142,9 +1142,6 @@ int __init nvdimm_bus_init(void)
{
int rc;
BUILD_BUG_ON(sizeof(struct nd_smart_payload) != 128);
BUILD_BUG_ON(sizeof(struct nd_smart_threshold_payload) != 8);
rc = bus_register(&nvdimm_bus_type);
if (rc)
return rc;