Storage: fix resize check fail issue

In image mode, the volume size of netfs pool will be affected by the
metadata size. So it has size change and this change is within a
reasonable range. So cover this size change in code.

Signed-off-by: meinaLi <[email protected]>

Author: meinaLi

libvirt/tests/src/virsh_cmd/volume/virsh_vol_resize.py

@@ -217,9 +217,15 @@ def check_vol_info(pool_vol, vol_name, test, expect_info=None):
             if expect_info['Allocation'] != img_info['dsize']:
                 logging.debug("Allocation(Disk size) is %s bytes",
                               img_info['dsize'])
-                logging.error("Volume Allocation not equal to expect value %s",
-                              expect_info['Allocation'])
-                check_allocation_pass = False
+                image_mode = utils_sys.is_image_mode()
+                if image_mode:
+                    max_allow = expect_info['Allocation'] * 1.4
+                    if img_info['dsize'] <= max_allow:
+                        check_allocation_pass = True
+                else:
+                    logging.error("Volume Allocation not equal to expect value %s",
+                                  expect_info['Allocation'])
+                    check_allocation_pass = False
             return check_capacity_pass & check_allocation_pass
         except KeyError as detail:
             test.error("Fail to check volume info:\n%s" % detail)