874bd959f4
As described in torvalds/linux@5f3a4a2 the &init_user_ns, and not the current user_ns, should be passed to posix_acl_from_xattr() and posix_acl_to_xattr(). Conveniently the init_user_ns is available through the init credential (kcred). Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Closes #4177