[PATCH] remove useless highmem bounce from loop/cryptoloop

[PATCH] remove useless highmem bounce from loop/cryptoloop

From: Ben Slusky <sluskyb@paranoiacs.org>

The attached patch changes the loop device transfer functions (including
cryptoloop transfers) to accept page/offset pairs instead of virtual
addresses, and removes the redundant kmaps in do_lo_send, do_lo_receive,
and loop_transfer_bio. Per Andrew Morton's request a while back.