PIPE_BUF_FLAG_ATOMIC  185 fs/pipe.c      		buf->flags |= PIPE_BUF_FLAG_ATOMIC;
PIPE_BUF_FLAG_ATOMIC  204 fs/pipe.c      	if (buf->flags & PIPE_BUF_FLAG_ATOMIC) {
PIPE_BUF_FLAG_ATOMIC  205 fs/pipe.c      		buf->flags &= ~PIPE_BUF_FLAG_ATOMIC;