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Date: Mon, 06 Oct 2008 13:45:57 -0500
From: Corey Minyard <minyard@....org>
To: Linux Kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Cc: shemminger@...tta.com, paulmck@...ux.vnet.ibm.com
Subject: [PATCH 2/3] Add RCU versions of socket hlist handling
Add RCU version of some of the socket hlist handlers, getting ready
for changing the UDP hash lock to RCU.
Signed-off-by: Corey Minyard <cminyard@...sta.com>
---
include/net/sock.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 06c5259..6cd39e5 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -42,6 +42,7 @@
#include <linux/kernel.h>
#include <linux/list.h>
+#include <linux/rculist.h>
#include <linux/timer.h>
#include <linux/cache.h>
#include <linux/module.h>
@@ -294,12 +295,24 @@ static inline struct sock *sk_head(const struct hlist_head *head)
return hlist_empty(head) ? NULL : __sk_head(head);
}
+static inline struct sock *sk_head_rcu(const struct hlist_head *head)
+{
+ struct hlist_node *first = rcu_dereference(head->first);
+ return first ? hlist_entry(first, struct sock, sk_node) : NULL;
+}
+
static inline struct sock *sk_next(const struct sock *sk)
{
return sk->sk_node.next ?
hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL;
}
+static inline struct sock *sk_next_rcu(const struct sock *sk)
+{
+ struct hlist_node *next = rcu_dereference(sk->sk_node.next);
+ return next ? hlist_entry(next, struct sock, sk_node) : NULL;
+}
+
static inline int sk_unhashed(const struct sock *sk)
{
return hlist_unhashed(&sk->sk_node);
@@ -361,6 +374,27 @@ static __inline__ int sk_del_node_init(struct sock *sk)
return rc;
}
+static inline int __sk_del_node_init_rcu(struct sock *sk)
+{
+ if (sk_hashed(sk)) {
+ hlist_del_init_rcu(&sk->sk_node);
+ return 1;
+ }
+ return 0;
+}
+
+static inline int sk_del_node_init_rcu(struct sock *sk)
+{
+ int rc = __sk_del_node_init_rcu(sk);
+
+ if (rc) {
+ /* paranoid for a while -acme */
+ WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
+ __sock_put(sk);
+ }
+ return rc;
+}
+
static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list)
{
hlist_add_head(&sk->sk_node, list);
@@ -372,6 +406,17 @@ static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list)
__sk_add_node(sk, list);
}
+static inline void __sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
+{
+ hlist_add_head_rcu(&sk->sk_node, list);
+}
+
+static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
+{
+ sock_hold(sk);
+ __sk_add_node_rcu(sk, list);
+}
+
static __inline__ void __sk_del_bind_node(struct sock *sk)
{
__hlist_del(&sk->sk_bind_node);
@@ -385,9 +430,14 @@ static __inline__ void sk_add_bind_node(struct sock *sk,
#define sk_for_each(__sk, node, list) \
hlist_for_each_entry(__sk, node, list, sk_node)
+#define sk_for_each_rcu(__sk, node, list) \
+ hlist_for_each_entry_rcu(__sk, node, list, sk_node)
#define sk_for_each_from(__sk, node) \
if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
hlist_for_each_entry_from(__sk, node, sk_node)
+#define sk_for_each_from_rcu(__sk, node) \
+ if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
+ hlist_for_each_entry_from_rcu(__sk, node, sk_node)
#define sk_for_each_continue(__sk, node) \
if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
hlist_for_each_entry_continue(__sk, node, sk_node)
--
1.5.6.5
--
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