LU-6464 ldiskfs: 64bit pointers in ext4_map_inode_page()

LU-6464 ldiskfs: 64bit pointers in ext4_map_inode_page()

To support >128TB OST ldiskfs should operates with large
blocks numbers. There is function ext4_map_inode_page() with
parameter “unsigned long *blocks”. An overflow is possible
for large blocks numbers. The problem is actual for x86_32
systems only.

This patch changes parameter type to sector_t that is 64 bit.

Xyratex-bug-id: MRP-2020
Signed-off-by: Artem Blagodarenko <artem_blagodarenko@xyratex.com>
Change-Id: If36544f39d3d31df9ff5ed644dad20f4910f3b39
Reviewed-on: http://review.whamcloud.com/14463
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>