block: loop: fix filesystem corruption in case of aio/dio

Starting from commit e36f620428(block: split bios to max possible length),
block core starts to split bio in the middle of bvec.

Unfortunately loop dio/aio doesn't consider this situation, and
always treat 'iter.iov_offset' as zero. Then filesystem corruption
is observed.

This patch figures out the offset of the base bvevc via
'bio->bi_iter.bi_bvec_done' and fixes the issue by passing the offset
to iov iterator.

Fixes: e36f6204288088f (block: split bios to max possible length)
Cc: Keith Busch <keith.busch@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org (4.5)
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

path: root/astraceroute/Makefile

astraceroute-libs =	-lGeoIP \
			-lpthread \
			-lz

astraceroute-objs =	xmalloc.o \
			ioops.o \
			proto_none.o \
			tprintf.o \
			bpf.o \
			str.o \
			sig.o \
			sock.o \
			link.o \
			dev.o \
			geoip.o \
			ring_rx.o \
			ring.o \
			astraceroute.o