SysfsMonitor: create dictionary of dm devices

Signed-off-by: Bryan Gurney <[email protected]>

testlib/infra.py

@@ -176,6 +176,12 @@ class SysfsMonitor(unittest.TestCase):
 
     def tearDown(self):
         if SysfsMonitor.verify_sysfs:  # pylint: disable=no-member
+            dm_devices = {}
+            for dmdev in os.listdir("/dev/mapper"):
+                dmdev_path = os.path.join("/dev/mapper", dmdev)
+                dmdev_num = os.path.basename(os.path.realpath(dmdev_path))
+                dm_devices[dmdev_num] = dmdev
+
             try:
                 misaligned_devices = []
                 for dev in os.listdir("/sys/class/block"):
@@ -186,7 +192,7 @@ def tearDown(self):
                         with open(dev_sysfspath, "r", encoding="utf-8") as dev_sysfs:
                             dev_align = dev_sysfs.read().rstrip()
                             if int(dev_align) != 0:
-                                misaligned_devices.append(dev)
+                                misaligned_devices.append(dm_devices[dev])
 
                 self.assertEqual(misaligned_devices, [])
             except FileNotFoundError: