@@ -155,6 +155,10 @@ static void nd_async_device_unregister(void *d, async_cookie_t cookie)
{
struct device *dev = d;
+ /* flush bus operations before delete */
+ nvdimm_bus_lock(dev);
+ nvdimm_bus_unlock(dev);
+
device_unregister(dev);
put_device(dev);
}
@@ -19,6 +19,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include "nd-core.h"
+#include "label.h"
#include "nd.h"
static DEFINE_IDA(dimm_ida);
@@ -296,9 +297,33 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(state);
+static ssize_t available_slots_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
+ ssize_t rc;
+ u32 nfree;
+
+ if (!ndd)
+ return -ENXIO;
+
+ nvdimm_bus_lock(dev);
+ nfree = nd_label_nfree(ndd);
+ if (nfree - 1 > nfree) {
+ dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
+ nfree = 0;
+ } else
+ nfree--;
+ rc = sprintf(buf, "%d\n", nfree);
+ nvdimm_bus_unlock(dev);
+ return rc;
+}
+static DEVICE_ATTR_RO(available_slots);
+
static struct attribute *nvdimm_attributes[] = {
&dev_attr_state.attr,
&dev_attr_commands.attr,
+ &dev_attr_available_slots.attr,
NULL,
};
@@ -56,7 +56,7 @@ size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
return ndd->nsindex_size;
}
-static int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
+int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
{
return ndd->nsarea.config_size / 129;
}
@@ -371,7 +371,7 @@ struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
return NULL;
}
-static u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
+u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
{
struct nd_namespace_index *nsindex;
unsigned long *free;
@@ -391,7 +391,7 @@ static u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
return slot;
}
-static bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot)
+bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot)
{
struct nd_namespace_index *nsindex;
unsigned long *free;
@@ -416,7 +416,7 @@ u32 nd_label_nfree(struct nvdimm_drvdata *ndd)
WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
if (!preamble_next(ndd, &nsindex, &free, &nslot))
- return 0;
+ return nvdimm_num_label_slots(ndd);
return bitmap_weight(free, nslot);
}
@@ -554,22 +554,270 @@ static int __pmem_label_update(struct nd_region *nd_region,
return 0;
}
-static int init_labels(struct nd_mapping *nd_mapping)
+static void del_label(struct nd_mapping *nd_mapping, int l)
+{
+ struct nd_namespace_label *next_label, *nd_label;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ unsigned int slot;
+ int j;
+
+ nd_label = nd_mapping->labels[l];
+ slot = to_slot(ndd, nd_label);
+ dev_vdbg(ndd->dev, "%s: clear: %d\n", __func__, slot);
+
+ for (j = l; (next_label = nd_mapping->labels[j + 1]); j++)
+ nd_mapping->labels[j] = next_label;
+ nd_mapping->labels[j] = NULL;
+}
+
+static bool is_old_resource(struct resource *res, struct resource **list, int n)
{
int i;
+
+ if (res->flags & DPA_RESOURCE_ADJUSTED)
+ return false;
+ for (i = 0; i < n; i++)
+ if (res == list[i])
+ return true;
+ return false;
+}
+
+static struct resource *to_resource(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_label *nd_label)
+{
+ struct resource *res;
+
+ for_each_dpa_resource(ndd, res) {
+ if (res->start != __le64_to_cpu(nd_label->dpa))
+ continue;
+ if (resource_size(res) != __le64_to_cpu(nd_label->rawsize))
+ continue;
+ return res;
+ }
+
+ return NULL;
+}
+
+/*
+ * 1/ Account all the labels that can be freed after this update
+ * 2/ Allocate and write the label to the staging (next) index
+ * 3/ Record the resources in the namespace device
+ */
+static int __blk_label_update(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, struct nd_namespace_blk *nsblk,
+ int num_labels)
+{
+ int i, l, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_namespace_label *nd_label;
+ struct nd_namespace_index *nsindex;
+ unsigned long *free, *victim_map = NULL;
+ struct resource *res, **old_res_list;
+ struct nd_label_id label_id;
+ u8 uuid[NSLABEL_UUID_LEN];
+ u32 nslot, slot;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return -ENXIO;
+
+ old_res_list = nsblk->res;
+ nfree = nd_label_nfree(ndd);
+ old_num_resources = nsblk->num_resources;
+ nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
+
+ /*
+ * We need to loop over the old resources a few times, which seems a
+ * bit inefficient, but we need to know that we have the label
+ * space before we start mutating the tracking structures.
+ * Otherwise the recovery method of last resort for userspace is
+ * disable and re-enable the parent region.
+ */
+ alloc = 0;
+ for_each_dpa_resource(ndd, res) {
+ if (strcmp(res->name, label_id.id) != 0)
+ continue;
+ if (!is_old_resource(res, old_res_list, old_num_resources))
+ alloc++;
+ }
+
+ victims = 0;
+ if (old_num_resources) {
+ /* convert old local-label-map to dimm-slot victim-map */
+ victim_map = kcalloc(BITS_TO_LONGS(nslot), sizeof(long),
+ GFP_KERNEL);
+ if (!victim_map)
+ return -ENOMEM;
+
+ /* mark unused labels for garbage collection */
+ for_each_clear_bit_le(slot, free, nslot) {
+ nd_label = nd_label_base(ndd) + slot;
+ memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
+ continue;
+ res = to_resource(ndd, nd_label);
+ if (res && is_old_resource(res, old_res_list,
+ old_num_resources))
+ continue;
+ slot = to_slot(ndd, nd_label);
+ set_bit(slot, victim_map);
+ victims++;
+ }
+ }
+
+ /* don't allow updates that consume the last label */
+ if (nfree - alloc < 0 || nfree - alloc + victims < 1) {
+ dev_info(&nsblk->dev, "insufficient label space\n");
+ kfree(victim_map);
+ return -ENOSPC;
+ }
+ /* from here on we need to abort on error */
+
+
+ /* assign all resources to the namespace before writing the labels */
+ nsblk->res = NULL;
+ nsblk->num_resources = 0;
+ for_each_dpa_resource(ndd, res) {
+ if (strcmp(res->name, label_id.id) != 0)
+ continue;
+ if (!nsblk_add_resource(nd_region, ndd, nsblk, res->start)) {
+ rc = -ENOMEM;
+ goto abort;
+ }
+ }
+
+ for (i = 0; i < nsblk->num_resources; i++) {
+ size_t offset;
+
+ res = nsblk->res[i];
+ if (is_old_resource(res, old_res_list, old_num_resources))
+ continue; /* carry-over */
+ slot = nd_label_alloc_slot(ndd);
+ if (slot == UINT_MAX)
+ goto abort;
+ dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot);
+
+ nd_label = nd_label_base(ndd) + slot;
+ memset(nd_label, 0, sizeof(struct nd_namespace_label));
+ memcpy(nd_label->uuid, nsblk->uuid, NSLABEL_UUID_LEN);
+ if (nsblk->alt_name)
+ memcpy(nd_label->name, nsblk->alt_name,
+ NSLABEL_NAME_LEN);
+ nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL);
+ nd_label->nlabel = __cpu_to_le16(0); /* N/A */
+ nd_label->position = __cpu_to_le16(0); /* N/A */
+ nd_label->isetcookie = __cpu_to_le64(0); /* N/A */
+ nd_label->dpa = __cpu_to_le64(res->start);
+ nd_label->rawsize = __cpu_to_le64(resource_size(res));
+ nd_label->lbasize = __cpu_to_le64(nsblk->lbasize);
+ nd_label->slot = __cpu_to_le32(slot);
+
+ /* update label */
+ offset = nd_label_offset(ndd, nd_label);
+ rc = nvdimm_set_config_data(ndd, offset, nd_label,
+ sizeof(struct nd_namespace_label));
+ if (rc < 0)
+ goto abort;
+ }
+
+ /* free up now unused slots in the new index */
+ for_each_set_bit(slot, victim_map, victim_map ? nslot : 0) {
+ dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
+ nd_label_free_slot(ndd, slot);
+ }
+
+ /* update index */
+ rc = nd_label_write_index(ndd, ndd->ns_next,
+ nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
+ if (rc)
+ goto abort;
+
+ /*
+ * Now that the on-dimm labels are up to date, fix up the tracking
+ * entries in nd_mapping->labels
+ */
+ nlabel = 0;
+ for_each_label(l, nd_label, nd_mapping->labels) {
+ nlabel++;
+ memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
+ continue;
+ nlabel--;
+ del_label(nd_mapping, l);
+ l--; /* retry with the new label at this index */
+ }
+ if (nlabel + nsblk->num_resources > num_labels) {
+ /*
+ * Bug, we can't end up with more resources than
+ * available labels
+ */
+ WARN_ON_ONCE(1);
+ rc = -ENXIO;
+ goto out;
+ }
+
+ for_each_clear_bit_le(slot, free, nslot) {
+ nd_label = nd_label_base(ndd) + slot;
+ memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
+ continue;
+ res = to_resource(ndd, nd_label);
+ res->flags &= ~DPA_RESOURCE_ADJUSTED;
+ dev_vdbg(&nsblk->dev, "assign label[%d] slot: %d\n", l, slot);
+ nd_mapping->labels[l++] = nd_label;
+ }
+ nd_mapping->labels[l] = NULL;
+
+ out:
+ kfree(old_res_list);
+ kfree(victim_map);
+ return rc;
+
+ abort:
+ /*
+ * 1/ repair the allocated label bitmap in the index
+ * 2/ restore the resource list
+ */
+ nd_label_copy(ndd, nsindex, to_current_namespace_index(ndd));
+ kfree(nsblk->res);
+ nsblk->res = old_res_list;
+ nsblk->num_resources = old_num_resources;
+ old_res_list = NULL;
+ goto out;
+}
+
+static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
+{
+ int i, l, old_num_labels = 0;
struct nd_namespace_index *nsindex;
+ struct nd_namespace_label *nd_label;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ size_t size = (num_labels + 1) * sizeof(struct nd_namespace_label *);
- if (!nd_mapping->labels)
- nd_mapping->labels = kcalloc(2, sizeof(void *), GFP_KERNEL);
+ for_each_label(l, nd_label, nd_mapping->labels)
+ old_num_labels++;
+ /*
+ * We need to preserve all the old labels for the mapping so
+ * they can be garbage collected after writing the new labels.
+ */
+ if (num_labels > old_num_labels) {
+ struct nd_namespace_label **labels;
+
+ labels = krealloc(nd_mapping->labels, size, GFP_KERNEL);
+ if (!labels)
+ return -ENOMEM;
+ nd_mapping->labels = labels;
+ }
if (!nd_mapping->labels)
return -ENOMEM;
+ for (i = old_num_labels; i <= num_labels; i++)
+ nd_mapping->labels[i] = NULL;
+
if (ndd->ns_current == -1 || ndd->ns_next == -1)
/* pass */;
else
- return 0;
+ return max(num_labels, old_num_labels);
nsindex = to_namespace_index(ndd, 0);
memset(nsindex, 0, ndd->nsarea.config_size);
@@ -582,7 +830,7 @@ static int init_labels(struct nd_mapping *nd_mapping)
ndd->ns_next = 1;
ndd->ns_current = 0;
- return 0;
+ return max(num_labels, old_num_labels);
}
static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
@@ -604,22 +852,15 @@ static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
return 0;
for_each_label(l, nd_label, nd_mapping->labels) {
- int j;
-
memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0)
continue;
slot = to_slot(ndd, nd_label);
nd_label_free_slot(ndd, slot);
dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
- for (j = l; nd_mapping->labels[j + 1]; j++) {
- struct nd_namespace_label *next_label;
-
- next_label = nd_mapping->labels[j + 1];
- nd_mapping->labels[j] = next_label;
- }
- nd_mapping->labels[j] = NULL;
+ del_label(nd_mapping, l);
num_freed++;
+ l--; /* retry with new label at this index */
}
if (num_freed > l) {
@@ -652,8 +893,8 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
continue;
}
- rc = init_labels(nd_mapping);
- if (rc)
+ rc = init_labels(nd_mapping, 1);
+ if (rc < 0)
return rc;
rc = __pmem_label_update(nd_region, nd_mapping, nspm, i);
@@ -663,3 +904,23 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
return 0;
}
+
+int nd_blk_namespace_label_update(struct nd_region *nd_region,
+ struct nd_namespace_blk *nsblk, resource_size_t size)
+{
+ struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+ struct resource *res;
+ int count = 0;
+
+ if (size == 0)
+ return del_labels(nd_mapping, nsblk->uuid);
+
+ for_each_dpa_resource(to_ndd(nd_mapping), res)
+ count++;
+
+ count = init_labels(nd_mapping, count);
+ if (count < 0)
+ return count;
+
+ return __blk_label_update(nd_region, nd_mapping, nsblk, count);
+}
@@ -128,9 +128,14 @@ void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
int nd_label_active_count(struct nvdimm_drvdata *ndd);
struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
+u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd);
+bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot);
u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
struct nd_region;
struct nd_namespace_pmem;
+struct nd_namespace_blk;
int nd_pmem_namespace_label_update(struct nd_region *nd_region,
struct nd_namespace_pmem *nspm, resource_size_t size);
+int nd_blk_namespace_label_update(struct nd_region *nd_region,
+ struct nd_namespace_blk *nsblk, resource_size_t size);
#endif /* __LABEL_H__ */
@@ -163,8 +163,7 @@ static int nd_namespace_label_update(struct nd_region *nd_region,
*/
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
- struct resource *res = &nspm->nsio.res;
- resource_size_t size = resource_size(res);
+ resource_size_t size = resource_size(&nspm->nsio.res);
if (size == 0 && nspm->uuid)
/* delete allocation */;
@@ -173,8 +172,15 @@ static int nd_namespace_label_update(struct nd_region *nd_region,
return nd_pmem_namespace_label_update(nd_region, nspm, size);
} else if (is_namespace_blk(dev)) {
- /* TODO: implement blk labels */
- return 0;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+ resource_size_t size = nd_namespace_blk_size(nsblk);
+
+ if (size == 0 && nsblk->uuid)
+ /* delete allocation */;
+ else if (!nsblk->uuid || !nsblk->lbasize)
+ return 0;
+
+ return nd_blk_namespace_label_update(nd_region, nsblk, size);
} else
return -ENXIO;
}
@@ -986,6 +992,48 @@ static ssize_t sector_size_store(struct device *dev,
}
static DEVICE_ATTR_RW(sector_size);
+static ssize_t dpa_extents_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_label_id label_id;
+ int count = 0, i;
+ u8 *uuid = NULL;
+ u32 flags = 0;
+
+ nvdimm_bus_lock(dev);
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ uuid = nspm->uuid;
+ flags = 0;
+ } else if (is_namespace_blk(dev)) {
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ uuid = nsblk->uuid;
+ flags = NSLABEL_FLAG_LOCAL;
+ }
+
+ if (!uuid)
+ goto out;
+
+ nd_label_gen_id(&label_id, uuid, flags);
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct resource *res;
+
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(res->name, label_id.id) == 0)
+ count++;
+ }
+ out:
+ nvdimm_bus_unlock(dev);
+
+ return sprintf(buf, "%d\n", count);
+}
+static DEVICE_ATTR_RO(dpa_extents);
+
static struct attribute *nd_namespace_attributes[] = {
&dev_attr_nstype.attr,
&dev_attr_size.attr,
@@ -993,6 +1041,7 @@ static struct attribute *nd_namespace_attributes[] = {
&dev_attr_resource.attr,
&dev_attr_alt_name.attr,
&dev_attr_sector_size.attr,
+ &dev_attr_dpa_extents.attr,
NULL,
};
@@ -75,5 +75,6 @@ struct nd_mapping;
struct resource *nsblk_add_resource(struct nd_region *nd_region,
struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
resource_size_t start);
+int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd);
void get_ndd(struct nvdimm_drvdata *ndd);
#endif /* __ND_CORE_H__ */