/*
* Queue up a socket with data pending. If there are idle nfsd
* processes, wake 'em up.
*
* This must be called with svsk->sk_lock held.
*/
static void
svc_sock_enqueue(struct svc_sock *svsk)
{
struct svc_serv *serv = svsk->sk_server;
struct svc_rqst *rqstp;
/* NOTE: Local BH is already disabled by our caller. */
spin_lock(&serv->sv_lock);
if (serv->sv_threads && serv->sv_sockets)
printk(KERN_ERR
"svc_sock_enqueue: threads and sockets both waiting??\n");
if (svsk->sk_busy) {
/* Don't enqueue socket while daemon is receiving */
dprintk("svc: socket %p busy, not enqueued\n", svsk->sk_sk);
goto out_unlock;
}
/* Mark socket as busy. It will remain in this state until the
* server has processed all pending data and put the socket back
* on the idle list.
*/
svsk->sk_busy = 1;
if ((rqstp = serv->sv_threads) != NULL) {
dprintk("svc: socket %p served by daemon %p\n",
svsk->sk_sk, rqstp);
svc_serv_dequeue(serv, rqstp);
if (rqstp->rq_sock)
printk(KERN_ERR
"svc_sock_enqueue: server %p, rq_sock=%p!\n",
rqstp, rqstp->rq_sock);
rqstp->rq_sock = svsk;
svsk->sk_inuse++;
wake_up(&rqstp->rq_wait);
} else {
dprintk("svc: socket %p put into queue\n", svsk->sk_sk);
rpc_append_list(&serv->sv_sockets, svsk);
svsk->sk_qued = 1;
}
out_unlock:
spin_unlock(&serv->sv_lock);
}
/*
* Add new request to wait queue.
*
* Swapper tasks always get inserted at the head of the queue.
* This should avoid many nasty memory deadlocks and hopefully
* improve overall performance.
* Everyone else gets appended to the queue to ensure proper FIFO behavior.
*/
int
rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task)
{
if (task->tk_rpcwait) {
if (task->tk_rpcwait != queue)
{
printk(KERN_WARNING "RPC: doubly enqueued task!\n");
return -EWOULDBLOCK;
}
return 0;
}
if (RPC_IS_SWAPPER(task))
rpc_insert_list(&queue->task, task);
else
rpc_append_list(&queue->task, task);
task->tk_rpcwait = queue;
dprintk("RPC: %4d added to queue %p \"%s\"\n",
task->tk_pid, queue, rpc_qname(queue));
return 0;
}
/*
* Queue up an idle server thread. Must have serv->sv_lock held.
*/
static inline void
svc_serv_enqueue(struct svc_serv *serv, struct svc_rqst *rqstp)
{
rpc_append_list(&serv->sv_threads, rqstp);
}