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Date: Thu, 08 Jun 2017 22:09:27 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: linux-nvdimm@...ts.01.org
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/9] 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@...el.com>
---
drivers/nvdimm/label.c | 39 +++++++++++++++++++++++++++++++++++----
1 file changed, 35 insertions(+), 4 deletions(-)
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index d7f9916c6ed5..c503362a03c7 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -326,7 +326,8 @@ static bool preamble_next(struct nvdimm_drvdata *ndd,
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 */
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)
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;
}
@@ -359,7 +375,7 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
nd_label = to_label(ndd, slot);
- if (!slot_valid(nd_label, slot))
+ if (!slot_valid(ndd, nd_label, slot))
continue;
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);
- if (!slot_valid(nd_label, slot)) {
+ if (!slot_valid(ndd, nd_label, slot)) {
u32 label_slot = __le32_to_cpu(nd_label->slot);
u64 size = __le64_to_cpu(nd_label->rawsize);
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;
nd_label = to_label(ndd, slot);
- if (!slot_valid(nd_label, slot))
+ if (!slot_valid(ndd, nd_label, slot))
continue;
if (n-- == 0)
@@ -600,6 +616,13 @@ static int __pmem_label_update(struct nd_region *nd_region,
nd_label->slot = __cpu_to_le32(slot);
if (namespace_label_has(ndd, 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__);
/* update label */
@@ -825,6 +848,14 @@ static int __blk_label_update(struct nd_region *nd_region,
nd_label->slot = __cpu_to_le32(slot);
if (namespace_label_has(ndd, 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 */
offset = nd_label_offset(ndd, nd_label);
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