LU-8299 llite: ll_fault should fail for insane file offsets

LU-8299 llite: ll_fault should fail for insane file offsets

A page fault for a mmapped lustre file at offset large than
2^63 cause Lustre client to hang due to wrong page index
calculations from signed loff_t.
There is no need to do such calclulations but perform
page offset sanity checks in ll_fault().

Cray-bug-id: LUS-1392
Signed-off-by: Alexander Zarochentsev <c17826@cray.com>
Change-Id: Ia492083ee4bdc23edfcbf88cb6d7e9726b2ca80c
Reviewed-on: https://review.whamcloud.com/34242
Reviewed-by: Andrew Perepechko <c17827@cray.com>
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>