Merge branch 'linux-linaro-lsk-v4.4-android' of git://git.linaro.org/kernel/linux...

[firefly-linux-kernel-4.4.55.git] / drivers / nvdimm / namespace_devs.c

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 0955b2cb10fe87ec17cac82ac60eeedac54fb3b5..62120c38d56bf317537a05342e22e6e08e3630b7 100644 (file)
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -77,6 +77,59 @@ static bool is_namespace_io(struct device *dev)
        return dev ? dev->type == &namespace_io_device_type : false;
 }
 
+static int is_uuid_busy(struct device *dev, void *data)
+{
+       u8 *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_namespace_blk(dev)) {
+               struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+               uuid2 = nsblk->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 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
+               return -EBUSY;
+
+       return 0;
+}
+
+static int is_namespace_uuid_busy(struct device *dev, void *data)
+{
+       if (is_nd_pmem(dev) || is_nd_blk(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, u8 *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);