Commit 355d8388 authored by Dan Williams's avatar Dan Williams
Browse files

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: default avatarDan Williams <dan.j.williams@intel.com>
parent 3934d841

drivers/nvdimm/label.c

+35 −4
Original line number Diff line number Diff line
@@ -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);