iov_iter_truncate
iov_iter_truncate(&iter, buf_len);
iov_iter_truncate(from, size);
iov_iter_truncate(to, size);
iov_iter_truncate(to, AUX_MAX_OFFSET - pos);
iov_iter_truncate(from, AUX_MAX_OFFSET - pos);
iov_iter_truncate(&prot_iter, prot_bytes);
iov_iter_truncate(&to, attr_size);
iov_iter_truncate(&subreq->io_iter, len);
iov_iter_truncate(iter, maxsize);
iov_iter_truncate(from, limit - pos);
iov_iter_truncate(iter, len);
iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos);
iov_iter_truncate(iter, fuse_round_up(ff->fm->fc, i_size - offset));
iov_iter_truncate(dio->submit.iter, length);
iov_iter_truncate(&subreq->io_iter, subreq->len);
iov_iter_truncate(&subreq->io_iter, subreq->len);
iov_iter_truncate(&subreq->io_iter, wreq->len - wreq->transferred);
iov_iter_truncate(&subreq->io_iter, subreq->len);
iov_iter_truncate(&subreq->io_iter, remain);
iov_iter_truncate(&subreq->io_iter, part);
iov_iter_truncate(&subreq->io_iter, part);
iov_iter_truncate(&subreq->io_iter, size);
iov_iter_truncate(iter, len);
iov_iter_truncate(&segment->iter, len);
iov_iter_truncate(iter, vmcore_size - *fpos);
iov_iter_truncate(from, count);
iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
iov_iter_truncate(&smb_msg.msg_iter, to_read);
iov_iter_truncate(&iter, dw->len);
iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
iov_iter_truncate(&rqst.rq_iter, 0);
iov_iter_truncate(from,
iov_iter_truncate(from, count);
iov_iter_truncate(to, isize - iocb->ki_pos);
iov_iter_truncate(i, max_bytes);
iov_iter_truncate(iter, inode->i_sb->s_maxbytes - iocb->ki_pos);
iov_iter_truncate(&cursor->iov_iter, length);
iov_iter_truncate(&con->v2.in_iter, 0);
iov_iter_truncate(&con->v2.out_iter, 0);