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namespace_devs.c
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namespace_devs.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*/
#include <linux/kstrtox.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/sort.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/nd.h>
#include "nd-core.h"
#include "pmem.h"
#include "pfn.h"
#include "nd.h"
static void namespace_io_release(struct device *dev)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
kfree(nsio);
}
static void namespace_pmem_release(struct device *dev)
{
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
struct nd_region *nd_region = to_nd_region(dev->parent);
if (nspm->id >= 0)
ida_simple_remove(&nd_region->ns_ida, nspm->id);
kfree(nspm->alt_name);
kfree(nspm->uuid);
kfree(nspm);
}
static bool is_namespace_pmem(const struct device *dev);
static bool is_namespace_io(const struct device *dev);
static int is_uuid_busy(struct device *dev, void *data)
{
uuid_t *uuid1 = data, *uuid2 = NULL;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
uuid2 = nspm->uuid;
} else if (is_nd_btt(dev)) {
struct nd_btt *nd_btt = to_nd_btt(dev);
uuid2 = nd_btt->uuid;
} else if (is_nd_pfn(dev)) {
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
uuid2 = nd_pfn->uuid;
}
if (uuid2 && uuid_equal(uuid1, uuid2))
return -EBUSY;
return 0;
}
static int is_namespace_uuid_busy(struct device *dev, void *data)
{
if (is_nd_region(dev))
return device_for_each_child(dev, data, is_uuid_busy);
return 0;
}
/**
* nd_is_uuid_unique - verify that no other namespace has @uuid
* @dev: any device on a nvdimm_bus
* @uuid: uuid to check
*/
bool nd_is_uuid_unique(struct device *dev, uuid_t *uuid)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
if (!nvdimm_bus)
return false;
WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
if (device_for_each_child(&nvdimm_bus->dev, uuid,
is_namespace_uuid_busy) != 0)
return false;
return true;
}
bool pmem_should_map_pages(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
struct nd_namespace_common *ndns = to_ndns(dev);
struct nd_namespace_io *nsio;
if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
return false;
if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
return false;
if (is_nd_pfn(dev) || is_nd_btt(dev))
return false;
if (ndns->force_raw)
return false;
nsio = to_nd_namespace_io(dev);
if (region_intersects(nsio->res.start, resource_size(&nsio->res),
IORESOURCE_SYSTEM_RAM,
IORES_DESC_NONE) == REGION_MIXED)
return false;
return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
}
EXPORT_SYMBOL(pmem_should_map_pages);
unsigned int pmem_sector_size(struct nd_namespace_common *ndns)
{
if (is_namespace_pmem(&ndns->dev)) {
struct nd_namespace_pmem *nspm;
nspm = to_nd_namespace_pmem(&ndns->dev);
if (nspm->lbasize == 0 || nspm->lbasize == 512)
/* default */;
else if (nspm->lbasize == 4096)
return 4096;
else
dev_WARN(&ndns->dev, "unsupported sector size: %ld\n",
nspm->lbasize);
}
/*
* There is no namespace label (is_namespace_io()), or the label
* indicates the default sector size.
*/
return 512;
}
EXPORT_SYMBOL(pmem_sector_size);
const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
char *name)
{
struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
const char *suffix = NULL;
if (ndns->claim && is_nd_btt(ndns->claim))
suffix = "s";
if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
int nsidx = 0;
if (is_namespace_pmem(&ndns->dev)) {
struct nd_namespace_pmem *nspm;
nspm = to_nd_namespace_pmem(&ndns->dev);
nsidx = nspm->id;
}
if (nsidx)
sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
suffix ? suffix : "");
else
sprintf(name, "pmem%d%s", nd_region->id,
suffix ? suffix : "");
} else {
return NULL;
}
return name;
}
EXPORT_SYMBOL(nvdimm_namespace_disk_name);
const uuid_t *nd_dev_to_uuid(struct device *dev)
{
if (dev && is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
return nspm->uuid;
}
return &uuid_null;
}
EXPORT_SYMBOL(nd_dev_to_uuid);
static ssize_t nstype_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
}
static DEVICE_ATTR_RO(nstype);
static ssize_t __alt_name_store(struct device *dev, const char *buf,
const size_t len)
{
char *input, *pos, *alt_name, **ns_altname;
ssize_t rc;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
ns_altname = &nspm->alt_name;
} else
return -ENXIO;
if (dev->driver || to_ndns(dev)->claim)
return -EBUSY;
input = kstrndup(buf, len, GFP_KERNEL);
if (!input)
return -ENOMEM;
pos = strim(input);
if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
rc = -EINVAL;
goto out;
}
alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
if (!alt_name) {
rc = -ENOMEM;
goto out;
}
kfree(*ns_altname);
*ns_altname = alt_name;
sprintf(*ns_altname, "%s", pos);
rc = len;
out:
kfree(input);
return rc;
}
static int nd_namespace_label_update(struct nd_region *nd_region,
struct device *dev)
{
dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
"namespace must be idle during label update\n");
if (dev->driver || to_ndns(dev)->claim)
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);
resource_size_t size = resource_size(&nspm->nsio.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
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(%zd)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
device_unlock(dev);
return rc < 0 ? rc : len;
}
static ssize_t alt_name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
char *ns_altname;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
ns_altname = nspm->alt_name;
} else
return -ENXIO;
return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
}
static DEVICE_ATTR_RW(alt_name);
static int scan_free(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
resource_size_t n)
{
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
int rc = 0;
while (n) {
struct resource *res, *last;
last = NULL;
for_each_dpa_resource(ndd, res)
if (strcmp(res->name, label_id->id) == 0)
last = res;
res = last;
if (!res)
return 0;
if (n >= resource_size(res)) {
n -= resource_size(res);
nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
nvdimm_free_dpa(ndd, res);
/* retry with last resource deleted */
continue;
}
rc = adjust_resource(res, res->start, resource_size(res) - n);
if (rc == 0)
res->flags |= DPA_RESOURCE_ADJUSTED;
nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
break;
}
return rc;
}
/**
* shrink_dpa_allocation - for each dimm in region free n bytes for label_id
* @nd_region: the set of dimms to reclaim @n bytes from
* @label_id: unique identifier for the namespace consuming this dpa range
* @n: number of bytes per-dimm to release
*
* Assumes resources are ordered. Starting from the end try to
* adjust_resource() the allocation to @n, but if @n is larger than the
* allocation delete it and find the 'new' last allocation in the label
* set.
*/
static int shrink_dpa_allocation(struct nd_region *nd_region,
struct nd_label_id *label_id, resource_size_t n)
{
int i;
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
int rc;
rc = scan_free(nd_region, nd_mapping, label_id, n);
if (rc)
return rc;
}
return 0;
}
static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
struct nd_region *nd_region, struct nd_mapping *nd_mapping,
resource_size_t n)
{
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct resource *res;
int rc = 0;
/* first resource allocation for this label-id or dimm */
res = nvdimm_allocate_dpa(ndd, label_id, nd_mapping->start, n);
if (!res)
rc = -EBUSY;
nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
return rc ? n : 0;
}
/**
* space_valid() - validate free dpa space against constraints
* @nd_region: hosting region of the free space
* @ndd: dimm device data for debug
* @label_id: namespace id to allocate space
* @prev: potential allocation that precedes free space
* @next: allocation that follows the given free space range
* @exist: first allocation with same id in the mapping
* @n: range that must satisfied for pmem allocations
* @valid: free space range to validate
*
* BLK-space is valid as long as it does not precede a PMEM
* allocation in a given region. PMEM-space must be contiguous
* and adjacent to an existing allocation (if one
* exists). If reserving PMEM any space is valid.
*/
static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
struct nd_label_id *label_id, struct resource *prev,
struct resource *next, struct resource *exist,
resource_size_t n, struct resource *valid)
{
bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
unsigned long align;
align = nd_region->align / nd_region->ndr_mappings;
valid->start = ALIGN(valid->start, align);
valid->end = ALIGN_DOWN(valid->end + 1, align) - 1;
if (valid->start >= valid->end)
goto invalid;
if (is_reserve)
return;
/* allocation needs to be contiguous, so this is all or nothing */
if (resource_size(valid) < n)
goto invalid;
/* we've got all the space we need and no existing allocation */
if (!exist)
return;
/* allocation needs to be contiguous with the existing namespace */
if (valid->start == exist->end + 1
|| valid->end == exist->start - 1)
return;
invalid:
/* truncate @valid size to 0 */
valid->end = valid->start - 1;
}
enum alloc_loc {
ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
};
static resource_size_t scan_allocate(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
resource_size_t n)
{
resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct resource *res, *exist = NULL, valid;
const resource_size_t to_allocate = n;
int first;
for_each_dpa_resource(ndd, res)
if (strcmp(label_id->id, res->name) == 0)
exist = res;
valid.start = nd_mapping->start;
valid.end = mapping_end;
valid.name = "free space";
retry:
first = 0;
for_each_dpa_resource(ndd, res) {
struct resource *next = res->sibling, *new_res = NULL;
resource_size_t allocate, available = 0;
enum alloc_loc loc = ALLOC_ERR;
const char *action;
int rc = 0;
/* ignore resources outside this nd_mapping */
if (res->start > mapping_end)
continue;
if (res->end < nd_mapping->start)
continue;
/* space at the beginning of the mapping */
if (!first++ && res->start > nd_mapping->start) {
valid.start = nd_mapping->start;
valid.end = res->start - 1;
space_valid(nd_region, ndd, label_id, NULL, next, exist,
to_allocate, &valid);
available = resource_size(&valid);
if (available)
loc = ALLOC_BEFORE;
}
/* space between allocations */
if (!loc && next) {
valid.start = res->start + resource_size(res);
valid.end = min(mapping_end, next->start - 1);
space_valid(nd_region, ndd, label_id, res, next, exist,
to_allocate, &valid);
available = resource_size(&valid);
if (available)
loc = ALLOC_MID;
}
/* space at the end of the mapping */
if (!loc && !next) {
valid.start = res->start + resource_size(res);
valid.end = mapping_end;
space_valid(nd_region, ndd, label_id, res, next, exist,
to_allocate, &valid);
available = resource_size(&valid);
if (available)
loc = ALLOC_AFTER;
}
if (!loc || !available)
continue;
allocate = min(available, n);
switch (loc) {
case ALLOC_BEFORE:
if (strcmp(res->name, label_id->id) == 0) {
/* adjust current resource up */
rc = adjust_resource(res, res->start - allocate,
resource_size(res) + allocate);
action = "cur grow up";
} else
action = "allocate";
break;
case ALLOC_MID:
if (strcmp(next->name, label_id->id) == 0) {
/* adjust next resource up */
rc = adjust_resource(next, next->start
- allocate, resource_size(next)
+ allocate);
new_res = next;
action = "next grow up";
} else if (strcmp(res->name, label_id->id) == 0) {
action = "grow down";
} else
action = "allocate";
break;
case ALLOC_AFTER:
if (strcmp(res->name, label_id->id) == 0)
action = "grow down";
else
action = "allocate";
break;
default:
return n;
}
if (strcmp(action, "allocate") == 0) {
new_res = nvdimm_allocate_dpa(ndd, label_id,
valid.start, allocate);
if (!new_res)
rc = -EBUSY;
} else if (strcmp(action, "grow down") == 0) {
/* adjust current resource down */
rc = adjust_resource(res, res->start, resource_size(res)
+ allocate);
if (rc == 0)
res->flags |= DPA_RESOURCE_ADJUSTED;
}
if (!new_res)
new_res = res;
nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
action, loc, rc);
if (rc)
return n;
n -= allocate;
if (n) {
/*
* Retry scan with newly inserted resources.
* For example, if we did an ALLOC_BEFORE
* insertion there may also have been space
* available for an ALLOC_AFTER insertion, so we
* need to check this same resource again
*/
goto retry;
} else
return 0;
}
if (n == to_allocate)
return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
return n;
}
static int merge_dpa(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
{
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct resource *res;
if (strncmp("pmem", label_id->id, 4) == 0)
return 0;
retry:
for_each_dpa_resource(ndd, res) {
int rc;
struct resource *next = res->sibling;
resource_size_t end = res->start + resource_size(res);
if (!next || strcmp(res->name, label_id->id) != 0
|| strcmp(next->name, label_id->id) != 0
|| end != next->start)
continue;
end += resource_size(next);
nvdimm_free_dpa(ndd, next);
rc = adjust_resource(res, res->start, end - res->start);
nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
if (rc)
return rc;
res->flags |= DPA_RESOURCE_ADJUSTED;
goto retry;
}
return 0;
}
int __reserve_free_pmem(struct device *dev, void *data)
{
struct nvdimm *nvdimm = data;
struct nd_region *nd_region;
struct nd_label_id label_id;
int i;
if (!is_memory(dev))
return 0;
nd_region = to_nd_region(dev);
if (nd_region->ndr_mappings == 0)
return 0;
memset(&label_id, 0, sizeof(label_id));
strcat(label_id.id, "pmem-reserve");
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
resource_size_t n, rem = 0;
if (nd_mapping->nvdimm != nvdimm)
continue;
n = nd_pmem_available_dpa(nd_region, nd_mapping);
if (n == 0)
return 0;
rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
dev_WARN_ONCE(&nd_region->dev, rem,
"pmem reserve underrun: %#llx of %#llx bytes\n",
(unsigned long long) n - rem,
(unsigned long long) n);
return rem ? -ENXIO : 0;
}
return 0;
}
void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
struct nd_mapping *nd_mapping)
{
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct resource *res, *_res;
for_each_dpa_resource_safe(ndd, res, _res)
if (strcmp(res->name, "pmem-reserve") == 0)
nvdimm_free_dpa(ndd, res);
}
/**
* grow_dpa_allocation - for each dimm allocate n bytes for @label_id
* @nd_region: the set of dimms to allocate @n more bytes from
* @label_id: unique identifier for the namespace consuming this dpa range
* @n: number of bytes per-dimm to add to the existing allocation
*
* Assumes resources are ordered. For BLK regions, first consume
* BLK-only available DPA free space, then consume PMEM-aliased DPA
* space starting at the highest DPA. For PMEM regions start
* allocations from the start of an interleave set and end at the first
* BLK allocation or the end of the interleave set, whichever comes
* first.
*/
static int grow_dpa_allocation(struct nd_region *nd_region,
struct nd_label_id *label_id, resource_size_t n)
{
int i;
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
resource_size_t rem = n;
int rc;
rem = scan_allocate(nd_region, nd_mapping, label_id, rem);
dev_WARN_ONCE(&nd_region->dev, rem,
"allocation underrun: %#llx of %#llx bytes\n",
(unsigned long long) n - rem,
(unsigned long long) n);
if (rem)
return -ENXIO;
rc = merge_dpa(nd_region, nd_mapping, label_id);
if (rc)
return rc;
}
return 0;
}
static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
struct nd_namespace_pmem *nspm, resource_size_t size)
{
struct resource *res = &nspm->nsio.res;
resource_size_t offset = 0;
if (size && !nspm->uuid) {
WARN_ON_ONCE(1);
size = 0;
}
if (size && nspm->uuid) {
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nd_label_id label_id;
struct resource *res;
if (!ndd) {
size = 0;
goto out;
}
nd_label_gen_id(&label_id, nspm->uuid, 0);
/* calculate a spa offset from the dpa allocation offset */
for_each_dpa_resource(ndd, res)
if (strcmp(res->name, label_id.id) == 0) {
offset = (res->start - nd_mapping->start)
* nd_region->ndr_mappings;
goto out;
}
WARN_ON_ONCE(1);
size = 0;
}
out:
res->start = nd_region->ndr_start + offset;
res->end = res->start + size - 1;
}
static bool uuid_not_set(const uuid_t *uuid, struct device *dev,
const char *where)
{
if (!uuid) {
dev_dbg(dev, "%s: uuid not set\n", where);
return true;
}
return false;
}
static ssize_t __size_store(struct device *dev, unsigned long long val)
{
resource_size_t allocated = 0, available = 0;
struct nd_region *nd_region = to_nd_region(dev->parent);
struct nd_namespace_common *ndns = to_ndns(dev);
struct nd_mapping *nd_mapping;
struct nvdimm_drvdata *ndd;
struct nd_label_id label_id;
u32 flags = 0, remainder;
int rc, i, id = -1;
uuid_t *uuid = NULL;
if (dev->driver || ndns->claim)
return -EBUSY;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
uuid = nspm->uuid;
id = nspm->id;
}
/*
* We need a uuid for the allocation-label and dimm(s) on which
* to store the label.
*/
if (uuid_not_set(uuid, dev, __func__))
return -ENXIO;
if (nd_region->ndr_mappings == 0) {
dev_dbg(dev, "not associated with dimm(s)\n");
return -ENXIO;
}
div_u64_rem(val, nd_region->align, &remainder);
if (remainder) {
dev_dbg(dev, "%llu is not %ldK aligned\n", val,
nd_region->align / SZ_1K);
return -EINVAL;
}
nd_label_gen_id(&label_id, uuid, flags);
for (i = 0; i < nd_region->ndr_mappings; i++) {
nd_mapping = &nd_region->mapping[i];
ndd = to_ndd(nd_mapping);
/*
* All dimms in an interleave set, need to be enabled
* for the size to be changed.
*/
if (!ndd)
return -ENXIO;
allocated += nvdimm_allocated_dpa(ndd, &label_id);
}
available = nd_region_allocatable_dpa(nd_region);
if (val > available + allocated)
return -ENOSPC;
if (val == allocated)
return 0;
val = div_u64(val, nd_region->ndr_mappings);
allocated = div_u64(allocated, nd_region->ndr_mappings);
if (val < allocated)
rc = shrink_dpa_allocation(nd_region, &label_id,
allocated - val);
else
rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
if (rc)
return rc;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
nd_namespace_pmem_set_resource(nd_region, nspm,
val * nd_region->ndr_mappings);
}
/*
* Try to delete the namespace if we deleted all of its
* allocation, this is not the seed or 0th device for the
* region, and it is not actively claimed by a btt, pfn, or dax
* instance.
*/
if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
nd_device_unregister(dev, ND_ASYNC);
return rc;
}
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;
int rc;
rc = kstrtoull(buf, 0, &val);
if (rc)
return rc;
device_lock(dev);
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);
/* setting size zero == 'delete namespace' */
if (rc == 0 && val == 0 && is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
kfree(nspm->uuid);
nspm->uuid = NULL;
}
dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
nvdimm_bus_unlock(dev);
device_unlock(dev);
return rc < 0 ? rc : len;
}
resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
{
struct device *dev = &ndns->dev;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
return resource_size(&nspm->nsio.res);
} else if (is_namespace_io(dev)) {
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
return resource_size(&nsio->res);
} else
WARN_ONCE(1, "unknown namespace type\n");
return 0;
}
resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
{
resource_size_t size;
nvdimm_bus_lock(&ndns->dev);
size = __nvdimm_namespace_capacity(ndns);
nvdimm_bus_unlock(&ndns->dev);
return size;
}
EXPORT_SYMBOL(nvdimm_namespace_capacity);
bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
{
int i;
bool locked = false;
struct device *dev = &ndns->dev;
struct nd_region *nd_region = to_nd_region(dev->parent);
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
struct nvdimm *nvdimm = nd_mapping->nvdimm;
if (test_bit(NDD_LOCKED, &nvdimm->flags)) {
dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm));
locked = true;
}
}
return locked;
}
EXPORT_SYMBOL(nvdimm_namespace_locked);
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%llu\n", (unsigned long long)
nvdimm_namespace_capacity(to_ndns(dev)));
}
static DEVICE_ATTR(size, 0444, size_show, size_store);
static uuid_t *namespace_to_uuid(struct device *dev)
{
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
return nspm->uuid;
}
return ERR_PTR(-ENXIO);
}
static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
uuid_t *uuid = namespace_to_uuid(dev);
if (IS_ERR(uuid))
return PTR_ERR(uuid);
if (uuid)
return sprintf(buf, "%pUb\n", uuid);
return sprintf(buf, "\n");
}
/**
* namespace_update_uuid - check for a unique uuid and whether we're "renaming"
* @nd_region: parent region so we can updates all dimms in the set
* @dev: namespace type for generating label_id
* @new_uuid: incoming uuid
* @old_uuid: reference to the uuid storage location in the namespace object
*/
static int namespace_update_uuid(struct nd_region *nd_region,
struct device *dev, uuid_t *new_uuid,
uuid_t **old_uuid)
{
struct nd_label_id old_label_id;
struct nd_label_id new_label_id;
int i;
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 (list_empty(&nd_mapping->labels))
return -EBUSY;
}
nd_label_gen_id(&old_label_id, *old_uuid, 0);
nd_label_gen_id(&new_label_id, new_uuid, 0);
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 nd_label_ent *label_ent;
struct resource *res;
for_each_dpa_resource(ndd, res)
if (strcmp(res->name, old_label_id.id) == 0)
sprintf((void *) res->name, "%s",
new_label_id.id);