Add new blk64_t handling functions

Add new blknum.c file which contains funtions to handle blk64_t and
low/high values in super blocks and inodes.

(Includes fixes from Nick Dokos, and additions from Valerie Aurora Henson)

Signed-off-by: Jose R. Santos <jrs@us.ibm.com>
Signed-off-by: Valerie Aurora Henson <vaurora@redhat.com>
Signed-off-by: Nick Dokos <nicholas.dokos@hp.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
3 files changed