bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
struct nd_namespace_common **_ndns)
{
bool claimed;
device_lock(&attach->dev);
claimed = __nd_attach_ndns(dev, attach, _ndns);
device_unlock(&attach->dev);
return claimed;
}
struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
struct nd_namespace_common *ndns)
{
struct device *dev = &nd_pfn->dev;
if (!nd_pfn)
return NULL;
nd_pfn->mode = PFN_MODE_NONE;
nd_pfn->align = PFN_DEFAULT_ALIGNMENT;
dev = &nd_pfn->dev;
device_initialize(&nd_pfn->dev);
if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
__func__, dev_name(ndns->claim));
put_device(dev);
return NULL;
}
return dev;
}
static struct device *__nd_pfn_create(struct nd_region *nd_region,
u8 *uuid, enum nd_pfn_mode mode,
struct nd_namespace_common *ndns)
{
struct nd_pfn *nd_pfn;
struct device *dev;
/* we can only create pages for contiguous ranged of pmem */
if (!is_nd_pmem(&nd_region->dev))
return NULL;
nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL);
if (!nd_pfn)
return NULL;
nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL);
if (nd_pfn->id < 0) {
kfree(nd_pfn);
return NULL;
}
nd_pfn->mode = mode;
if (uuid)
uuid = kmemdup(uuid, 16, GFP_KERNEL);
nd_pfn->uuid = uuid;
dev = &nd_pfn->dev;
dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id);
dev->parent = &nd_region->dev;
dev->type = &nd_pfn_device_type;
dev->groups = nd_pfn_attribute_groups;
device_initialize(&nd_pfn->dev);
if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
__func__, dev_name(ndns->claim));
put_device(dev);
return NULL;
}
return dev;
}