[nbd] pass iov_iter to nbd_xmit()

... and don't mess with kmap() - just use BVEC_ITER for those parts.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-11-12 05:09:35 -05:00
commit c9f2b6aeb9