*/
#include <linux/device.h>
#include <linux/ndctl.h>
+#include <linux/slab.h>
#include <linux/io.h>
#include <linux/nd.h>
#include "nd-core.h"
return ndd->nsindex_size;
}
+static int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
+{
+ return ndd->nsarea.config_size / 129;
+}
+
int nd_label_validate(struct nvdimm_drvdata *ndd)
{
/*
return base + 2 * sizeof_namespace_index(ndd);
}
+static int to_slot(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_label *nd_label)
+{
+ return nd_label - nd_label_base(ndd);
+}
+
#define for_each_clear_bit_le(bit, addr, size) \
for ((bit) = find_next_zero_bit_le((addr), (size), 0); \
(bit) < (size); \
(bit) = find_next_zero_bit_le((addr), (size), (bit) + 1))
/**
- * preamble_current - common variable initialization for nd_label_* routines
+ * preamble_index - common variable initialization for nd_label_* routines
* @ndd: dimm container for the relevant label set
+ * @idx: namespace_index index
* @nsindex_out: on return set to the currently active namespace index
* @free: on return set to the free label bitmap in the index
* @nslot: on return set to the number of slots in the label space
*/
-static bool preamble_current(struct nvdimm_drvdata *ndd,
+static bool preamble_index(struct nvdimm_drvdata *ndd, int idx,
struct nd_namespace_index **nsindex_out,
unsigned long **free, u32 *nslot)
{
struct nd_namespace_index *nsindex;
- nsindex = to_current_namespace_index(ndd);
+ nsindex = to_namespace_index(ndd, idx);
if (nsindex == NULL)
return false;
return label_id->id;
}
+static bool preamble_current(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_index **nsindex,
+ unsigned long **free, u32 *nslot)
+{
+ return preamble_index(ndd, ndd->ns_current, nsindex,
+ free, nslot);
+}
+
+static bool preamble_next(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_index **nsindex,
+ unsigned long **free, u32 *nslot)
+{
+ return preamble_index(ndd, ndd->ns_next, nsindex,
+ free, nslot);
+}
+
static bool slot_valid(struct nd_namespace_label *nd_label, u32 slot)
{
/* check that we are written where we expect to be written */
return NULL;
}
+
+static u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
+{
+ struct nd_namespace_index *nsindex;
+ unsigned long *free;
+ u32 nslot, slot;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return UINT_MAX;
+
+ WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
+
+ slot = find_next_bit_le(free, nslot, 0);
+ if (slot == nslot)
+ return UINT_MAX;
+
+ clear_bit_le(slot, free);
+
+ return slot;
+}
+
+static bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot)
+{
+ struct nd_namespace_index *nsindex;
+ unsigned long *free;
+ u32 nslot;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return false;
+
+ WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
+
+ if (slot < nslot)
+ return !test_and_set_bit_le(slot, free);
+ return false;
+}
+
+u32 nd_label_nfree(struct nvdimm_drvdata *ndd)
+{
+ struct nd_namespace_index *nsindex;
+ unsigned long *free;
+ u32 nslot;
+
+ WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return 0;
+
+ return bitmap_weight(free, nslot);
+}
+
+static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
+ unsigned long flags)
+{
+ struct nd_namespace_index *nsindex;
+ unsigned long offset;
+ u64 checksum;
+ u32 nslot;
+ int rc;
+
+ nsindex = to_namespace_index(ndd, index);
+ if (flags & ND_NSINDEX_INIT)
+ nslot = nvdimm_num_label_slots(ndd);
+ else
+ nslot = __le32_to_cpu(nsindex->nslot);
+
+ memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN);
+ nsindex->flags = __cpu_to_le32(0);
+ nsindex->seq = __cpu_to_le32(seq);
+ offset = (unsigned long) nsindex
+ - (unsigned long) to_namespace_index(ndd, 0);
+ nsindex->myoff = __cpu_to_le64(offset);
+ nsindex->mysize = __cpu_to_le64(sizeof_namespace_index(ndd));
+ offset = (unsigned long) to_namespace_index(ndd,
+ nd_label_next_nsindex(index))
+ - (unsigned long) to_namespace_index(ndd, 0);
+ nsindex->otheroff = __cpu_to_le64(offset);
+ offset = (unsigned long) nd_label_base(ndd)
+ - (unsigned long) to_namespace_index(ndd, 0);
+ nsindex->labeloff = __cpu_to_le64(offset);
+ nsindex->nslot = __cpu_to_le32(nslot);
+ nsindex->major = __cpu_to_le16(1);
+ nsindex->minor = __cpu_to_le16(1);
+ nsindex->checksum = __cpu_to_le64(0);
+ if (flags & ND_NSINDEX_INIT) {
+ unsigned long *free = (unsigned long *) nsindex->free;
+ u32 nfree = ALIGN(nslot, BITS_PER_LONG);
+ int last_bits, i;
+
+ memset(nsindex->free, 0xff, nfree / 8);
+ for (i = 0, last_bits = nfree - nslot; i < last_bits; i++)
+ clear_bit_le(nslot + i, free);
+ }
+ checksum = nd_fletcher64(nsindex, sizeof_namespace_index(ndd), 1);
+ nsindex->checksum = __cpu_to_le64(checksum);
+ rc = nvdimm_set_config_data(ndd, __le64_to_cpu(nsindex->myoff),
+ nsindex, sizeof_namespace_index(ndd));
+ if (rc < 0)
+ return rc;
+
+ if (flags & ND_NSINDEX_INIT)
+ return 0;
+
+ /* copy the index we just wrote to the new 'next' */
+ WARN_ON(index != ndd->ns_next);
+ nd_label_copy(ndd, to_current_namespace_index(ndd), nsindex);
+ ndd->ns_current = nd_label_next_nsindex(ndd->ns_current);
+ ndd->ns_next = nd_label_next_nsindex(ndd->ns_next);
+ WARN_ON(ndd->ns_current == ndd->ns_next);
+
+ return 0;
+}
+
+static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_label *nd_label)
+{
+ return (unsigned long) nd_label
+ - (unsigned long) to_namespace_index(ndd, 0);
+}
+
+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;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_namespace_label *victim_label;
+ struct nd_namespace_label *nd_label;
+ struct nd_namespace_index *nsindex;
+ unsigned long *free;
+ u32 nslot, slot;
+ size_t offset;
+ int rc;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return -ENXIO;
+
+ /* allocate and write the label to the staging (next) index */
+ slot = nd_label_alloc_slot(ndd);
+ if (slot == UINT_MAX)
+ return -ENXIO;
+ 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, nspm->uuid, NSLABEL_UUID_LEN);
+ if (nspm->alt_name)
+ memcpy(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN);
+ nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_UPDATING);
+ 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->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)
+ return rc;
+
+ /* Garbage collect the previous label */
+ victim_label = nd_mapping->labels[0];
+ if (victim_label) {
+ slot = to_slot(ndd, victim_label);
+ nd_label_free_slot(ndd, slot);
+ dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
+ }
+
+ /* update index */
+ rc = nd_label_write_index(ndd, ndd->ns_next,
+ nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
+ if (rc < 0)
+ return rc;
+
+ nd_mapping->labels[0] = nd_label;
+
+ return 0;
+}
+
+static int init_labels(struct nd_mapping *nd_mapping)
+{
+ int i;
+ struct nd_namespace_index *nsindex;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+
+ if (!nd_mapping->labels)
+ nd_mapping->labels = kcalloc(2, sizeof(void *), GFP_KERNEL);
+
+ if (!nd_mapping->labels)
+ return -ENOMEM;
+
+ if (ndd->ns_current == -1 || ndd->ns_next == -1)
+ /* pass */;
+ else
+ return 0;
+
+ nsindex = to_namespace_index(ndd, 0);
+ memset(nsindex, 0, ndd->nsarea.config_size);
+ for (i = 0; i < 2; i++) {
+ int rc = nd_label_write_index(ndd, i, i*2, ND_NSINDEX_INIT);
+
+ if (rc)
+ return rc;
+ }
+ ndd->ns_next = 1;
+ ndd->ns_current = 0;
+
+ return 0;
+}
+
+static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
+{
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_namespace_label *nd_label;
+ struct nd_namespace_index *nsindex;
+ u8 label_uuid[NSLABEL_UUID_LEN];
+ int l, num_freed = 0;
+ unsigned long *free;
+ u32 nslot, slot;
+
+ if (!uuid)
+ return 0;
+
+ /* no index || no labels == nothing to delete */
+ if (!preamble_next(ndd, &nsindex, &free, &nslot)
+ || !nd_mapping->labels)
+ 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;
+ num_freed++;
+ }
+
+ if (num_freed > l) {
+ /*
+ * num_freed will only ever be > l when we delete the last
+ * label
+ */
+ kfree(nd_mapping->labels);
+ nd_mapping->labels = NULL;
+ dev_dbg(ndd->dev, "%s: no more labels\n", __func__);
+ }
+
+ return nd_label_write_index(ndd, ndd->ns_next,
+ nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
+}
+
+int nd_pmem_namespace_label_update(struct nd_region *nd_region,
+ struct nd_namespace_pmem *nspm, resource_size_t size)
+{
+ int i;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ int rc;
+
+ if (size == 0) {
+ rc = del_labels(nd_mapping, nspm->uuid);
+ if (rc)
+ return rc;
+ continue;
+ }
+
+ rc = init_labels(nd_mapping);
+ if (rc)
+ return rc;
+
+ rc = __pmem_label_update(nd_region, nd_mapping, nspm, i);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
return size;
}
+static int nd_namespace_label_update(struct nd_region *nd_region,
+ struct device *dev)
+{
+ dev_WARN_ONCE(dev, dev->driver,
+ "namespace must be idle during label update\n");
+ if (dev->driver)
+ return 0;
+
+ /*
+ * Only allow label writes that will result in a valid namespace
+ * or deletion of an existing namespace.
+ */
+ 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);
+
+ if (size == 0 && nspm->uuid)
+ /* delete allocation */;
+ else if (!nspm->uuid)
+ return 0;
+
+ return nd_pmem_namespace_label_update(nd_region, nspm, size);
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: implement blk labels */
+ return 0;
+ } else
+ return -ENXIO;
+}
+
static ssize_t alt_name_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc;
device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __alt_name_store(dev, buf, len);
+ if (rc >= 0)
+ rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
device_unlock(dev);
- return rc;
+ return rc < 0 ? rc : len;
}
static ssize_t alt_name_show(struct device *dev,
static ssize_t size_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
unsigned long long val;
u8 **uuid = NULL;
int rc;
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __size_store(dev, val);
+ if (rc >= 0)
+ rc = nd_namespace_label_update(nd_region, dev);
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
nvdimm_bus_unlock(dev);
device_unlock(dev);
- return rc ? rc : len;
+ return rc < 0 ? rc : len;
}
static ssize_t size_show(struct device *dev,
u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
struct nd_label_id old_label_id;
struct nd_label_id new_label_id;
- int i, rc;
+ int i;
- rc = nd_is_uuid_unique(dev, new_uuid) ? 0 : -EINVAL;
- if (rc) {
- kfree(new_uuid);
- return rc;
- }
+ if (!nd_is_uuid_unique(dev, new_uuid))
+ return -EINVAL;
if (*old_uuid == NULL)
goto out;
+ /*
+ * If we've already written a label with this uuid, then it's
+ * too late to rename because we can't reliably update the uuid
+ * without losing the old namespace. Userspace must delete this
+ * namespace to abandon the old uuid.
+ */
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+
+ /*
+ * This check by itself is sufficient because old_uuid
+ * would be NULL above if this uuid did not exist in the
+ * currently written set.
+ *
+ * FIXME: can we delete uuid with zero dpa allocated?
+ */
+ if (nd_mapping->labels)
+ return -EBUSY;
+ }
+
nd_label_gen_id(&old_label_id, *old_uuid, flags);
nd_label_gen_id(&new_label_id, new_uuid, flags);
for (i = 0; i < nd_region->ndr_mappings; i++) {
rc = nd_uuid_store(dev, &uuid, buf, len);
if (rc >= 0)
rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
+ if (rc >= 0)
+ rc = nd_namespace_label_update(nd_region, dev);
+ else
+ kfree(uuid);
dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
rc, buf, buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
- return rc ? rc : len;
+ return rc < 0 ? rc : len;
}
static DEVICE_ATTR_RW(uuid);
struct device_attribute *attr, const char *buf, size_t len)
{
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+ struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc;
if (!is_namespace_blk(dev))
nvdimm_bus_lock(dev);
rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
ns_lbasize_supported);
- dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
- rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ if (rc >= 0)
+ rc = nd_namespace_label_update(nd_region, dev);
+ dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
+ rc, rc < 0 ? "tried" : "wrote", buf,
+ buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
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