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authorDan Williams <dan.j.williams@intel.com>2016-10-05 21:13:23 -0700
committerDan Williams <dan.j.williams@intel.com>2016-10-07 09:22:53 -0700
commit16660eaea0ccc6d0692f173922cd365876eb288e (patch)
tree9a833933b28c11ee81bc5a7c4c52af59f443c210
parent012207334a26727369b2668716d84e55af1f1d22 (diff)
libnvdimm, namespace: update label implementation for multi-pmem
Instead of assuming that there will only ever be one allocated range at the start of the region, account for additional namespaces that might start at an offset from the region base. After this change pmem namespaces now have a reason to carry an array of resources similar to blk. Unifying the resource tracking infrastructure in nd_namespace_common is a future cleanup candidate. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
-rw-r--r--drivers/nvdimm/label.c72
1 files changed, 53 insertions, 19 deletions
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index c37357210428..fac7cabe8f56 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -494,12 +494,13 @@ static int __pmem_label_update(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
int pos)
{
- u64 cookie = nd_region_interleave_set_cookie(nd_region), rawsize;
+ u64 cookie = nd_region_interleave_set_cookie(nd_region);
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
- struct nd_namespace_label *victim_label;
+ struct nd_label_ent *label_ent, *victim = NULL;
struct nd_namespace_label *nd_label;
struct nd_namespace_index *nsindex;
- struct nd_label_ent *label_ent;
+ struct nd_label_id label_id;
+ struct resource *res;
unsigned long *free;
u32 nslot, slot;
size_t offset;
@@ -508,6 +509,16 @@ static int __pmem_label_update(struct nd_region *nd_region,
if (!preamble_next(ndd, &nsindex, &free, &nslot))
return -ENXIO;
+ nd_label_gen_id(&label_id, nspm->uuid, 0);
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(res->name, label_id.id) == 0)
+ break;
+
+ if (!res) {
+ WARN_ON_ONCE(1);
+ return -ENXIO;
+ }
+
/* allocate and write the label to the staging (next) index */
slot = nd_label_alloc_slot(ndd);
if (slot == UINT_MAX)
@@ -523,11 +534,10 @@ static int __pmem_label_update(struct nd_region *nd_region,
nd_label->nlabel = __cpu_to_le16(nd_region->ndr_mappings);
nd_label->position = __cpu_to_le16(pos);
nd_label->isetcookie = __cpu_to_le64(cookie);
- rawsize = div_u64(resource_size(&nspm->nsio.res),
- nd_region->ndr_mappings);
- nd_label->rawsize = __cpu_to_le64(rawsize);
- nd_label->dpa = __cpu_to_le64(nd_mapping->start);
+ nd_label->rawsize = __cpu_to_le64(resource_size(res));
+ nd_label->dpa = __cpu_to_le64(res->start);
nd_label->slot = __cpu_to_le32(slot);
+ nd_dbg_dpa(nd_region, ndd, res, "%s\n", __func__);
/* update label */
offset = nd_label_offset(ndd, nd_label);
@@ -538,22 +548,39 @@ static int __pmem_label_update(struct nd_region *nd_region,
/* Garbage collect the previous label */
mutex_lock(&nd_mapping->lock);
- label_ent = list_first_entry_or_null(&nd_mapping->labels,
- typeof(*label_ent), list);
- WARN_ON(!label_ent);
- victim_label = label_ent ? label_ent->label : NULL;
- if (victim_label) {
- label_ent->label = NULL;
- slot = to_slot(ndd, victim_label);
- nd_label_free_slot(ndd, slot);
+ list_for_each_entry(label_ent, &nd_mapping->labels, list) {
+ if (!label_ent->label)
+ continue;
+ if (memcmp(nspm->uuid, label_ent->label->uuid,
+ NSLABEL_UUID_LEN) != 0)
+ continue;
+ victim = label_ent;
+ list_move_tail(&victim->list, &nd_mapping->labels);
+ break;
+ }
+ if (victim) {
dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
+ slot = to_slot(ndd, victim->label);
+ nd_label_free_slot(ndd, slot);
+ victim->label = NULL;
}
/* update index */
rc = nd_label_write_index(ndd, ndd->ns_next,
nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
- if (rc == 0 && label_ent)
- label_ent->label = nd_label;
+ if (rc == 0) {
+ list_for_each_entry(label_ent, &nd_mapping->labels, list)
+ if (!label_ent->label) {
+ label_ent->label = nd_label;
+ nd_label = NULL;
+ break;
+ }
+ dev_WARN_ONCE(&nspm->nsio.common.dev, nd_label,
+ "failed to track label: %d\n",
+ to_slot(ndd, nd_label));
+ if (nd_label)
+ rc = -ENXIO;
+ }
mutex_unlock(&nd_mapping->lock);
return rc;
@@ -899,7 +926,9 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
- int rc;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct resource *res;
+ int rc, count = 0;
if (size == 0) {
rc = del_labels(nd_mapping, nspm->uuid);
@@ -908,7 +937,12 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
continue;
}
- rc = init_labels(nd_mapping, 1);
+ for_each_dpa_resource(ndd, res)
+ if (strncmp(res->name, "pmem", 3) == 0)
+ count++;
+ WARN_ON_ONCE(!count);
+
+ rc = init_labels(nd_mapping, count);
if (rc < 0)
return rc;