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authorDan Williams <dan.j.williams@intel.com>2017-06-04 10:18:39 +0900
committerDan Williams <dan.j.williams@intel.com>2017-06-15 14:31:40 -0700
commitb3fde74ea195d2f9f49830a29f971a0aab4cd67a (patch)
tree57919bab5e02417c880eb7887bb6672c5ac07d3d /drivers/nvdimm/dax_devs.c
parent355d838878e1baec494c228458238d078dc3ca51 (diff)
downloadlinux-b3fde74ea195d2f9f49830a29f971a0aab4cd67a.tar.bz2
libnvdimm, label: add address abstraction identifiers
Starting with v1.2 labels, 'address abstractions' can be hinted via an address abstraction id that implies an info-block format. The standard address abstraction in the specification is the v2 format of the Block-Translation-Table (BTT). Support for that is saved for a later patch, for now we add support for the Linux supported address abstractions BTT (v1), PFN, and DAX. The new 'holder_class' attribute for namespace devices is added for tooling to specify the 'abstraction_guid' to store in the namespace label. For v1.1 labels this field is undefined and any setting of 'holder_class' away from the default 'none' value will only have effect until the driver is unloaded. Setting 'holder_class' requires that whatever device tries to claim the namespace must be of the specified class. Cc: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/dax_devs.c')
-rw-r--r--drivers/nvdimm/dax_devs.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index c1b6556aea6e..59f676381ae5 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -111,6 +111,14 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
if (ndns->force_raw)
return -ENODEV;
+ switch (ndns->claim_class) {
+ case NVDIMM_CCLASS_NONE:
+ case NVDIMM_CCLASS_DAX:
+ break;
+ default:
+ return -ENODEV;
+ }
+
nvdimm_bus_lock(&ndns->dev);
nd_dax = nd_dax_alloc(nd_region);
nd_pfn = &nd_dax->nd_pfn;