高质量代码区

static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
{
struct fuse_iqueue *fiq = &fc->iq;

BUG_ON(test_bit(FR_BACKGROUND, &req->flags));
spin_lock(&fiq->waitq.lock);
if (!fiq->connected) {
spin_unlock(&fiq->waitq.lock);
req->out.h.error = -ENOTCONN;
} else {
req->in.h.unique = fuse_get_unique(fiq);
queue_request(fiq, req);
/* acquire extra reference, since request is still needed
after request_end() */
__fuse_get_request(req);
spin_unlock(&fiq->waitq.lock);

request_wait_answer(fc, req);
/* Pairs with smp_wmb() in request_end() */
smp_rmb();
}
}