catch and report ENOSPC errors in convert_os_errors

fs/errors.py

@@ -182,6 +182,8 @@ def convert_os_errors(func):
                 raise ResourceInvalidError(path,opname=opname,details=e)
             if e.errno == errno.EOPNOTSUPP:
                 raise UnsupportedError(opname,details=e)
+            if e.errno == errno.ENOSPC:
+                raise StorageSpaceError(opname,details=e)
             # Sometimes windows gives some random errors...
             if sys.platform == "win32":
                 if e.errno in (13,):