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 if (is_namespace_blk(dev)) {
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;
}
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 if (is_namespace_blk(dev)) {
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
ns_altname = &nsblk->alt_name;
} else
return -ENXIO;
if (dev->driver || to_ndns(dev)->claim)
return -EBUSY;
input = kmemdup(buf, len + 1, GFP_KERNEL);
if (!input)
return -ENOMEM;
input[len] = '\0';
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;
}
ssize_t nd_namespace_store(struct device *dev,
struct nd_namespace_common **_ndns, const char *buf,
size_t len)
{
struct nd_namespace_common *ndns;
struct device *found;
char *name;
if (dev->driver) {
dev_dbg(dev, "%s: -EBUSY\n", __func__);
return -EBUSY;
}
name = kstrndup(buf, len, GFP_KERNEL);
if (!name)
return -ENOMEM;
strim(name);
if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
/* pass */;
else {
len = -EINVAL;
goto out;
}
ndns = *_ndns;
if (strcmp(name, "") == 0) {
nd_detach_and_reset(dev, _ndns);
goto out;
} else if (ndns) {
dev_dbg(dev, "namespace already set to: %s\n",
dev_name(&ndns->dev));
len = -EBUSY;
goto out;
}
found = device_find_child(dev->parent, name, namespace_match);
if (!found) {
dev_dbg(dev, "'%s' not found under %s\n", name,
dev_name(dev->parent));
len = -ENODEV;
goto out;
}
ndns = to_ndns(found);
if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
dev_dbg(dev, "%s too small to host\n", name);
len = -ENXIO;
goto out_attach;
}
WARN_ON_ONCE(!is_nvdimm_bus_locked(dev));
if (!nd_attach_ndns(dev, ndns, _ndns)) {
dev_dbg(dev, "%s already claimed\n",
dev_name(&ndns->dev));
len = -EBUSY;
}
out_attach:
put_device(&ndns->dev); /* from device_find_child */
out:
kfree(name);
return len;
}
static ssize_t __namespace_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct nd_btt *nd_btt = to_nd_btt(dev);
struct nd_namespace_common *ndns;
struct device *found;
char *name;
if (dev->driver) {
dev_dbg(dev, "%s: -EBUSY\n", __func__);
return -EBUSY;
}
name = kstrndup(buf, len, GFP_KERNEL);
if (!name)
return -ENOMEM;
strim(name);
if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
/* pass */;
else {
len = -EINVAL;
goto out;
}
ndns = nd_btt->ndns;
if (strcmp(name, "") == 0) {
/* detach the namespace and destroy / reset the btt device */
nd_btt_detach_ndns(nd_btt);
if (is_nd_btt_idle(dev))
nd_device_unregister(dev, ND_ASYNC);
else {
nd_btt->lbasize = 0;
kfree(nd_btt->uuid);
nd_btt->uuid = NULL;
}
goto out;
} else if (ndns) {
dev_dbg(dev, "namespace already set to: %s\n",
dev_name(&ndns->dev));
len = -EBUSY;
goto out;
}
found = device_find_child(dev->parent, name, namespace_match);
if (!found) {
dev_dbg(dev, "'%s' not found under %s\n", name,
dev_name(dev->parent));
len = -ENODEV;
goto out;
}
ndns = to_ndns(found);
if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
dev_dbg(dev, "%s too small to host btt\n", name);
len = -ENXIO;
goto out_attach;
}
WARN_ON_ONCE(!is_nvdimm_bus_locked(&nd_btt->dev));
if (!nd_btt_attach_ndns(nd_btt, ndns)) {
dev_dbg(dev, "%s already claimed\n",
dev_name(&ndns->dev));
len = -EBUSY;
}
out_attach:
put_device(&ndns->dev); /* from device_find_child */
out:
kfree(name);
return len;
}
