From b3fde74ea195d2f9f49830a29f971a0aab4cd67a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Sun, 4 Jun 2017 10:18:39 +0900 Subject: 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 Signed-off-by: Dan Williams --- drivers/nvdimm/btt_devs.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/nvdimm/btt_devs.c') diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c index 4c989bb9a8a0..31d875a91569 100644 --- a/drivers/nvdimm/btt_devs.c +++ b/drivers/nvdimm/btt_devs.c @@ -295,6 +295,14 @@ int nd_btt_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_BTT: + break; + default: + return -ENODEV; + } + nvdimm_bus_lock(&ndns->dev); btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns); nvdimm_bus_unlock(&ndns->dev); -- cgit v1.2.3