We need to introduce a VSW_CANLOFI flag for filesystems to identify
that they know how to do lofi mounts.
Is there a reason why you can't leverage the vfs_set_feature()/vfs_has_feature() capability instead of the legacy VSW flag bit approach? The vfs_feature() capability was integrated in snv_77
ie. rfe 6553589 / PSARC/2007/227