Such driver exists already, http://www.fs-driver.org/ and it's fully IFS.
2009/11/11 Love Nystrom love.nystrom@gmail.com
If not, the IFS driver can not implement the full NT security model (neither can FAT), but I think it would still be a good idea to have an ext2/ext3 IFS driver. Even better if we could support a journaling fs like f.ex reiserfs.
Best Regards // Love