Update VTFS task

[e1turin]

VTFS task is a little bit outdated.

Fix it according to mentioned TODO comments:

• In PR Review Tasks #15 some work has been done to update tasks, but the vtfs task still uses old kernel API. Changes to be done was described in PR ПЛР4.1 P3306 Сорокин Артём #6 , and mentioned in TODO-comments inside of the task text.

Future work is required.