---

yaml
---
r: 71731
b: refs/heads/master
c: 96a1f7d
h: refs/heads/master
i:
  71729: e3246b3
  71727: f953a03
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: aa5617c55357d86c9082ba1d66fa9795370c9954
+refs/heads/master: 96a1f7dba6e464155c0d1dc69c6c2efa96b644ac

trunk/drivers/md/dm-ioctl.c

@@ -1515,3 +1515,35 @@ void dm_interface_exit(void)
 
 	dm_hash_exit();
 }
+
+/**
+ * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers
+ * @md: Pointer to mapped_device
+ * @name: Buffer (size DM_NAME_LEN) for name
+ * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined
+ */
+int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid)
+{
+	int r = 0;
+	struct hash_cell *hc;
+
+	if (!md)
+		return -ENXIO;
+
+	dm_get(md);
+	down_read(&_hash_lock);
+	hc = dm_get_mdptr(md);
+	if (!hc || hc->md != md) {
+		r = -ENXIO;
+		goto out;
+	}
+
+	strcpy(name, hc->name);
+	strcpy(uuid, hc->uuid ? : "");
+
+out:
+	up_read(&_hash_lock);
+	dm_put(md);
+
+	return r;
+}

trunk/include/linux/device-mapper.h

@@ -188,6 +188,7 @@ int dm_wait_event(struct mapped_device *md, int event_nr);
  * Info functions.
  */
 const char *dm_device_name(struct mapped_device *md);
+int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);
 struct gendisk *dm_disk(struct mapped_device *md);
 int dm_suspended(struct mapped_device *md);
 int dm_noflush_suspending(struct dm_target *ti);