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libnvdimm/labels: Add isetcookie validation helper

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In preparation to handle CXL labels with the same code that handles EFI
labels, add a specific interleave-set-cookie validation helper
rather than a getter since the CXL label type does not support this
concept. The answer for CXL labels will always be true.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/162982113550.1124374.206762177785773038.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2021-08-24 09:05:35 -07:00
parent b4366a827f
commit 9761b02d40
2 changed files with 10 additions and 5 deletions
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8
drivers/nvdimm/namespace_devs.c
View File

@ -1847,15 +1847,13 @@ static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
list_for_each_entry(label_ent, &nd_mapping->labels, list) {
struct nd_namespace_label *nd_label = label_ent->label;
u16 position, nlabel;
u64 isetcookie;
if (!nd_label)
continue;
isetcookie = nsl_get_isetcookie(ndd, nd_label);
position = nsl_get_position(ndd, nd_label);
nlabel = nsl_get_nlabel(ndd, nd_label);
if (isetcookie != cookie)
if (!nsl_validate_isetcookie(ndd, nd_label, cookie))
continue;
if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
@ -1968,10 +1966,10 @@ static struct device *create_namespace_pmem(struct nd_region *nd_region,
return ERR_PTR(-ENXIO);
}
if (nsl_get_isetcookie(ndd, nd_label) != cookie) {
if (!nsl_validate_isetcookie(ndd, nd_label, cookie)) {
dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
nd_label->uuid);
if (nsl_get_isetcookie(ndd, nd_label) != altcookie)
if (!nsl_validate_isetcookie(ndd, nd_label, altcookie))
return ERR_PTR(-EAGAIN);
dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",

7
drivers/nvdimm/nd.h
View File

@ -83,6 +83,13 @@ static inline u64 nsl_get_isetcookie(struct nvdimm_drvdata *ndd,
return __le64_to_cpu(nd_label->isetcookie);
}
static inline bool nsl_validate_isetcookie(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u64 cookie)
{
return cookie == __le64_to_cpu(nd_label->isetcookie);
}
static inline u16 nsl_get_position(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{