from_head 28 fs/gfs2/meta_io.h int from_head) from_head 30 fs/gfs2/meta_io.h BUG_ON(from_head < to_head); from_head 31 fs/gfs2/meta_io.h memcpy(to_bh->b_data + to_head, from_bh->b_data + from_head, from_head 32 fs/gfs2/meta_io.h from_bh->b_size - from_head); from_head 33 fs/gfs2/meta_io.h memset(to_bh->b_data + to_bh->b_size + to_head - from_head, from_head 34 fs/gfs2/meta_io.h 0, from_head - to_head);