* after a clear, the socket must be read/accepted
* if this succeeds, it must be set again.
* SK_CLOSE can set at any time. It is never cleared.
- * sk_inuse contains a bias of '1' until SK_DEAD is set.
- * so when sk_inuse hits zero, we know the socket is dead
+ * xpt_ref contains a bias of '1' until SK_DEAD is set.
+ * so when xprt_ref hits zero, we know the transport is dead
* and no-one is using it.
* SK_DEAD can only be set while SK_BUSY is held which ensures
* no other thread will be using the socket or will try to
"svc_sock_enqueue: server %p, rq_sock=%p!\n",
rqstp, rqstp->rq_sock);
rqstp->rq_sock = svsk;
- atomic_inc(&svsk->sk_inuse);
+ svc_xprt_get(&svsk->sk_xprt);
rqstp->rq_reserved = serv->sv_max_mesg;
atomic_add(rqstp->rq_reserved, &svsk->sk_reserved);
BUG_ON(svsk->sk_pool != pool);
list_del_init(&svsk->sk_ready);
dprintk("svc: socket %p dequeued, inuse=%d\n",
- svsk->sk_sk, atomic_read(&svsk->sk_inuse));
+ svsk->sk_sk, atomic_read(&svsk->sk_xprt.xpt_ref.refcount));
return svsk;
}
}
}
-/*
- * Release a socket after use.
- */
-static inline void
-svc_sock_put(struct svc_sock *svsk)
-{
- if (atomic_dec_and_test(&svsk->sk_inuse)) {
- BUG_ON(!test_bit(SK_DEAD, &svsk->sk_flags));
- module_put(svsk->sk_xprt.xpt_class->xcl_owner);
- svsk->sk_xprt.xpt_ops->xpo_free(&svsk->sk_xprt);
- }
-}
-
static void
svc_sock_release(struct svc_rqst *rqstp)
{
svc_reserve(rqstp, 0);
rqstp->rq_sock = NULL;
- svc_sock_put(svsk);
+ svc_xprt_put(&svsk->sk_xprt);
}
/*
return NULL;
}
-/*
- * Make sure that we don't have too many active connections. If we
- * have, something must be dropped.
- *
- * There's no point in trying to do random drop here for DoS
- * prevention. The NFS clients does 1 reconnect in 15 seconds. An
- * attacker can easily beat that.
- *
- * The only somewhat efficient mechanism would be if drop old
- * connections from the same IP first. But right now we don't even
- * record the client IP in svc_sock.
- */
-static void svc_check_conn_limits(struct svc_serv *serv)
-{
- if (serv->sv_tmpcnt > (serv->sv_nrthreads+3)*20) {
- struct svc_sock *svsk = NULL;
- spin_lock_bh(&serv->sv_lock);
- if (!list_empty(&serv->sv_tempsocks)) {
- if (net_ratelimit()) {
- /* Try to help the admin */
- printk(KERN_NOTICE "%s: too many open TCP "
- "sockets, consider increasing the "
- "number of nfsd threads\n",
- serv->sv_name);
- }
- /*
- * Always select the oldest socket. It's not fair,
- * but so is life
- */
- svsk = list_entry(serv->sv_tempsocks.prev,
- struct svc_sock,
- sk_list);
- set_bit(SK_CLOSE, &svsk->sk_flags);
- atomic_inc(&svsk->sk_inuse);
- }
- spin_unlock_bh(&serv->sv_lock);
-
- if (svsk) {
- svc_sock_enqueue(svsk);
- svc_sock_put(svsk);
- }
- }
-}
-
/*
* Receive data from a TCP socket.
*/
spin_unlock_bh(&serv->sv_lock);
}
+/*
+ * Make sure that we don't have too many active connections. If we
+ * have, something must be dropped.
+ *
+ * There's no point in trying to do random drop here for DoS
+ * prevention. The NFS clients does 1 reconnect in 15 seconds. An
+ * attacker can easily beat that.
+ *
+ * The only somewhat efficient mechanism would be if drop old
+ * connections from the same IP first. But right now we don't even
+ * record the client IP in svc_sock.
+ */
+static void svc_check_conn_limits(struct svc_serv *serv)
+{
+ if (serv->sv_tmpcnt > (serv->sv_nrthreads+3)*20) {
+ struct svc_sock *svsk = NULL;
+ spin_lock_bh(&serv->sv_lock);
+ if (!list_empty(&serv->sv_tempsocks)) {
+ if (net_ratelimit()) {
+ /* Try to help the admin */
+ printk(KERN_NOTICE "%s: too many open TCP "
+ "sockets, consider increasing the "
+ "number of nfsd threads\n",
+ serv->sv_name);
+ }
+ /*
+ * Always select the oldest socket. It's not fair,
+ * but so is life
+ */
+ svsk = list_entry(serv->sv_tempsocks.prev,
+ struct svc_sock,
+ sk_list);
+ set_bit(SK_CLOSE, &svsk->sk_flags);
+ svc_xprt_get(&svsk->sk_xprt);
+ }
+ spin_unlock_bh(&serv->sv_lock);
+
+ if (svsk) {
+ svc_sock_enqueue(svsk);
+ svc_xprt_put(&svsk->sk_xprt);
+ }
+ }
+}
+
/*
* Receive the next request on any socket. This code is carefully
* organised not to touch any cachelines in the shared svc_serv
spin_lock_bh(&pool->sp_lock);
if ((svsk = svc_sock_dequeue(pool)) != NULL) {
rqstp->rq_sock = svsk;
- atomic_inc(&svsk->sk_inuse);
+ svc_xprt_get(&svsk->sk_xprt);
rqstp->rq_reserved = serv->sv_max_mesg;
atomic_add(rqstp->rq_reserved, &svsk->sk_reserved);
} else {
svc_sock_received(svsk);
} else {
dprintk("svc: server %p, pool %u, socket %p, inuse=%d\n",
- rqstp, pool->sp_id, svsk, atomic_read(&svsk->sk_inuse));
+ rqstp, pool->sp_id, svsk,
+ atomic_read(&svsk->sk_xprt.xpt_ref.refcount));
len = svsk->sk_xprt.xpt_ops->xpo_recvfrom(rqstp);
dprintk("svc: got len=%d\n", len);
}
if (!test_and_set_bit(SK_OLD, &svsk->sk_flags))
continue;
- if (atomic_read(&svsk->sk_inuse) > 1 || test_bit(SK_BUSY, &svsk->sk_flags))
+ if (atomic_read(&svsk->sk_xprt.xpt_ref.refcount) > 1
+ || test_bit(SK_BUSY, &svsk->sk_flags))
continue;
- atomic_inc(&svsk->sk_inuse);
+ svc_xprt_get(&svsk->sk_xprt);
list_move(le, &to_be_aged);
set_bit(SK_CLOSE, &svsk->sk_flags);
set_bit(SK_DETACHED, &svsk->sk_flags);
/* a thread will dequeue and close it soon */
svc_sock_enqueue(svsk);
- svc_sock_put(svsk);
+ svc_xprt_put(&svsk->sk_xprt);
}
mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ);
svsk->sk_odata = inet->sk_data_ready;
svsk->sk_owspace = inet->sk_write_space;
svsk->sk_server = serv;
- atomic_set(&svsk->sk_inuse, 1);
svsk->sk_lastrecv = get_seconds();
spin_lock_init(&svsk->sk_lock);
INIT_LIST_HEAD(&svsk->sk_deferred);
* is about to be destroyed (in svc_destroy).
*/
if (!test_and_set_bit(SK_DEAD, &svsk->sk_flags)) {
- BUG_ON(atomic_read(&svsk->sk_inuse)<2);
- atomic_dec(&svsk->sk_inuse);
+ BUG_ON(atomic_read(&svsk->sk_xprt.xpt_ref.refcount) < 2);
if (test_bit(SK_TEMP, &svsk->sk_flags))
serv->sv_tmpcnt--;
+ svc_xprt_put(&svsk->sk_xprt);
}
spin_unlock_bh(&serv->sv_lock);
/* someone else will have to effect the close */
return;
- atomic_inc(&svsk->sk_inuse);
+ svc_xprt_get(&svsk->sk_xprt);
svc_delete_socket(svsk);
clear_bit(SK_BUSY, &svsk->sk_flags);
- svc_sock_put(svsk);
+ svc_xprt_put(&svsk->sk_xprt);
}
void svc_force_close_socket(struct svc_sock *svsk)
struct svc_sock *svsk;
if (too_many) {
- svc_sock_put(dr->svsk);
+ svc_xprt_put(&dr->svsk->sk_xprt);
kfree(dr);
return;
}
spin_unlock(&svsk->sk_lock);
set_bit(SK_DEFERRED, &svsk->sk_flags);
svc_sock_enqueue(svsk);
- svc_sock_put(svsk);
+ svc_xprt_put(&svsk->sk_xprt);
}
static struct cache_deferred_req *
dr->argslen = rqstp->rq_arg.len >> 2;
memcpy(dr->args, rqstp->rq_arg.head[0].iov_base-skip, dr->argslen<<2);
}
- atomic_inc(&rqstp->rq_sock->sk_inuse);
+ svc_xprt_get(rqstp->rq_xprt);
dr->svsk = rqstp->rq_sock;
dr->handle.revisit = svc_revisit;
projects / linux-2.6 / blobdiff