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libnvdimm/label: Add a helper for nlabel validation 

In the CXL namespace label there is no need for nlabel since that is
inferred from the region. Add a helper that moves nsl_get_label() behind
a helper that validates the number of labels relative to the region.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/163116430293.2460985.12693942353621355232.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2021-09-08 22:11:42 -07:00
parent d1c6e08e75
commit 8172db9252
2 changed files with 9 additions and 3 deletions
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5
drivers/nvdimm/namespace_devs.c
View File

@ -1848,12 +1848,11 @@ static bool has_uuid_at_pos(struct nd_region *nd_region, const uuid_t *uuid,
list_for_each_entry(label_ent, &nd_mapping->labels, list) {
struct nd_namespace_label *nd_label = label_ent->label;
u16 position, nlabel;
u16 position;
if (!nd_label)
continue;
position = nsl_get_position(ndd, nd_label);
nlabel = nsl_get_nlabel(ndd, nd_label);
if (!nsl_validate_isetcookie(ndd, nd_label, cookie))
continue;
@ -1870,7 +1869,7 @@ static bool has_uuid_at_pos(struct nd_region *nd_region, const uuid_t *uuid,
return false;
}
found_uuid = true;
if (nlabel != nd_region->ndr_mappings)
if (!nsl_validate_nlabel(nd_region, ndd, nd_label))
continue;
if (position != pos)
continue;

7
drivers/nvdimm/nd.h
View File

@ -342,6 +342,13 @@ struct nd_region {
struct nd_mapping mapping[];
};
static inline bool nsl_validate_nlabel(struct nd_region *nd_region,
struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return nsl_get_nlabel(ndd, nd_label) == nd_region->ndr_mappings;
}
struct nd_blk_region {
int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,