diff --git a/calculate/lib/datavars.py b/calculate/lib/datavars.py
index e4bd787..1dd2183 100644
--- a/calculate/lib/datavars.py
+++ b/calculate/lib/datavars.py
@@ -277,7 +277,7 @@ class Variable:
             if value and value.lower() != "auto":
                 return "on" if self.isTrue(value) else "off"
             else:
-                return value
+                return ""
         if self.type == "bool":
             value = "on" if self.isTrue(value) else "off"
         if "bool" in self.type and "list" in self.type:
diff --git a/calculate/lib/utils/files.py b/calculate/lib/utils/files.py
index 02a381a..9845a6d 100644
--- a/calculate/lib/utils/files.py
+++ b/calculate/lib/utils/files.py
@@ -366,6 +366,9 @@ class processProgress(process):
             self.cacheresult = "\n".join(self.cacheresult)
 
 def countFiles(dirpath,onefilesystem=True):
+    """
+    Count files in specified dirpath
+    """
     num = 1
     for dirpath,dirnames,filenames in os.walk(dirpath):
         num += len(set(dirnames) | set(filenames))
@@ -376,6 +379,10 @@ def countFiles(dirpath,onefilesystem=True):
                 dirnames.remove(dirname)
     return num
 
+def getFilesCount(directory):
+    """Alias for compatibility"""
+    return countFiles(directory,onefilesystem=False)
+
 
 def runOsCommand(cmd,in_str=None, env_dict=None):
     """Run system command
@@ -445,15 +452,22 @@ def getRunCommands():
 
 def isMount(pathname):
     """В случае монтирования директории выдает другой примонтированный путь"""
-    absPath = path.abspath(pathname)
+    findPath = [path.abspath(pathname)]
+    if findPath[0].startswith('/dev'):
+        info = device.getUdevDeviceInfo(name=findPath[0])
+        if 'DM_VG_NAME' in info and 'DM_LV_NAME' in info:
+            lvmDeviceName = \
+                '/dev/mapper/{vg}-{lv}'.format(vg=info['DM_VG_NAME'],
+                                               lv=info['DM_LV_NAME'])
+            findPath.append(lvmDeviceName)
     mtabFile = '/etc/mtab'
     if not os.access(mtabFile,os.R_OK):
         return ""
-    return filter(lambda x: x!=absPath,
+    return filter(lambda x: x!=findPath,
            reduce(lambda x,y: y,
-           filter(lambda x: absPath in x,
-           map(lambda x: [x[0], x[1]],
-           map(lambda x: x.split(" "),
+           ifilter(lambda x: any(p in x for p in findPath),
+           imap(lambda x: [x[0], x[1]],
+           imap(lambda x: x.split(" "),
            open(mtabFile)))), [""]))[0]
 
 def commonPath(*paths):
@@ -505,13 +519,6 @@ def checkDigestFile(digestfile):
                     digest.hexdigest().upper() == hashdata.upper()))
     return result
 
-def getFilesCount(directory):
-    """Get files count from directory"""
-    if path.exists(directory):
-        return len(reduce(lambda x,y:x+y,map(lambda x:x[1]+x[2],
-                          os.walk(directory)),[]))
-    return 0
-
 def listDirectory(directory,fullPath=False,onlyDir=False):
     """Get files from directory, if it exists"""
     if not path.exists(directory):
@@ -664,7 +671,8 @@ class SingletonParam(type):
     def __call__(cls,*args,**kw):
         keyarg = args[0] if args else ""
         if not keyarg in cls.instance:
-            cls.instance[keyarg] = super(SingletonParam, cls).__call__(*args, **kw)
+            cls.instance[keyarg] = \
+                super(SingletonParam, cls).__call__(*args, **kw)
         return cls.instance[keyarg]
 
 import device
@@ -696,8 +704,9 @@ class FStab(object):
                       ).get('DEVNAME',data[0])
             data[1] = data[1] if data[2] != "swap" else "swap"
         self.rotateCache = zip(*self.cache)
-    
-    def getBy(self,what=DIR,where=NAME,_in=None,eq=None,noteq=None,allentry=False):
+
+    def getBy(self,what=DIR,where=NAME,_in=None,eq=None,
+              noteq=None,allentry=False):
         """Get data from fstab"""
         if not eq is None:
             filterfunc = lambda x: x[where] == eq
diff --git a/calculate/lib/variables/linux.py b/calculate/lib/variables/linux.py
index 0219167..819cb32 100644
--- a/calculate/lib/variables/linux.py
+++ b/calculate/lib/variables/linux.py
@@ -193,8 +193,11 @@ class VariableOsLinuxFilesnum(Variable,Linux):
     systemRoot = "/"
 
     def get(self):
-        """Get files count"""
-        return str(countFiles(self.systemRoot))
+        """Get files count. Count files discard because it to long
+        operation. This value is already count by calculate-builder and
+        is placed in calculate3.env"""
+        return str(0)
+        #return str(countFiles(self.systemRoot))
 
 class LinuxDataVars(SimpleDataVars):
     def __init__(self,systemRoot="/"):