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libnvdimm, label: add v1.2 label checksum support 

The v1.2 namespace label specification adds a fletcher checksum to each
label instance. Add generation and validation support for the new field.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-06-06 14:56:43 -07:00
parent 3934d8410c
commit 355d838878
1 changed files with 35 additions and 4 deletions
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39
drivers/nvdimm/label.c
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@ -326,7 +326,8 @@ static bool preamble_next(struct nvdimm_drvdata *ndd,
free, nslot); free, nslot);
} }
static bool slot_valid(struct nd_namespace_label *nd_label, u32 slot) static bool slot_valid(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, u32 slot)
{ {
/* check that we are written where we expect to be written */ /* check that we are written where we expect to be written */
if (slot != __le32_to_cpu(nd_label->slot)) if (slot != __le32_to_cpu(nd_label->slot))
@ -337,6 +338,21 @@ static bool slot_valid(struct nd_namespace_label *nd_label, u32 slot)
| __le64_to_cpu(nd_label->rawsize)) % SZ_4K) | __le64_to_cpu(nd_label->rawsize)) % SZ_4K)
return false; return false;
/* check checksum */
if (namespace_label_has(ndd, checksum)) {
u64 sum, sum_save;
sum_save = __le64_to_cpu(nd_label->checksum);
nd_label->checksum = __cpu_to_le64(0);
sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
nd_label->checksum = __cpu_to_le64(sum_save);
if (sum != sum_save) {
dev_dbg(ndd->dev, "%s fail checksum. slot: %d expect: %#llx\n",
__func__, slot, sum);
return false;
}
}
return true; return true;
} }
@ -359,7 +375,7 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
nd_label = to_label(ndd, slot); nd_label = to_label(ndd, slot);
if (!slot_valid(nd_label, slot)) if (!slot_valid(ndd, nd_label, slot))
continue; continue;
memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN); memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
@ -391,7 +407,7 @@ int nd_label_active_count(struct nvdimm_drvdata *ndd)
nd_label = to_label(ndd, slot); nd_label = to_label(ndd, slot);
if (!slot_valid(nd_label, slot)) { if (!slot_valid(ndd, nd_label, slot)) {
u32 label_slot = __le32_to_cpu(nd_label->slot); u32 label_slot = __le32_to_cpu(nd_label->slot);
u64 size = __le64_to_cpu(nd_label->rawsize); u64 size = __le64_to_cpu(nd_label->rawsize);
u64 dpa = __le64_to_cpu(nd_label->dpa); u64 dpa = __le64_to_cpu(nd_label->dpa);
@ -419,7 +435,7 @@ struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
struct nd_namespace_label *nd_label; struct nd_namespace_label *nd_label;
nd_label = to_label(ndd, slot); nd_label = to_label(ndd, slot);
if (!slot_valid(nd_label, slot)) if (!slot_valid(ndd, nd_label, slot))
continue; continue;
if (n-- == 0) if (n-- == 0)
@ -600,6 +616,13 @@ static int __pmem_label_update(struct nd_region *nd_region,
nd_label->slot = __cpu_to_le32(slot); nd_label->slot = __cpu_to_le32(slot);
if (namespace_label_has(ndd, type_guid)) if (namespace_label_has(ndd, type_guid))
guid_copy(&nd_label->type_guid, &nd_set->type_guid); guid_copy(&nd_label->type_guid, &nd_set->type_guid);
if (namespace_label_has(ndd, checksum)) {
u64 sum;
nd_label->checksum = __cpu_to_le64(0);
sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
nd_label->checksum = __cpu_to_le64(sum);
}
nd_dbg_dpa(nd_region, ndd, res, "%s\n", __func__); nd_dbg_dpa(nd_region, ndd, res, "%s\n", __func__);
/* update label */ /* update label */
@ -825,6 +848,14 @@ static int __blk_label_update(struct nd_region *nd_region,
nd_label->slot = __cpu_to_le32(slot); nd_label->slot = __cpu_to_le32(slot);
if (namespace_label_has(ndd, type_guid)) if (namespace_label_has(ndd, type_guid))
guid_copy(&nd_label->type_guid, &nd_set->type_guid); guid_copy(&nd_label->type_guid, &nd_set->type_guid);
if (namespace_label_has(ndd, checksum)) {
u64 sum;
nd_label->checksum = __cpu_to_le64(0);
sum = nd_fletcher64(nd_label,
sizeof_namespace_label(ndd), 1);
nd_label->checksum = __cpu_to_le64(sum);
}
/* update label */ /* update label */
offset = nd_label_offset(ndd, nd_label); offset = nd_label_offset(ndd, nd_label);