Comment # 3 on bug 950500 from Arvin Schnell

The crc=1 was requested to generate xfs with superblock version 5 which
is needed for extended ACL support (see fate #317042).

If this should be configurable please make a feature request. In that case
I would prefer xfs to have an option to enable v5 superblocks independent
of crc. Using the side-effect of crc for acl support is very confusing for
customers.