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authorDavid S. Miller <davem@davemloft.net>2012-06-09 22:36:36 -0700
committerDavid S. Miller <davem@davemloft.net>2012-06-11 02:08:47 -0700
commit97bab73f987e2781129cd6f4b6379bf44d808cc6 (patch)
tree40b10c4c021c8b5524c19f79fcfe4b0799b59952 /include/net/inetpeer.h
parentc0efc887dcadbdbfe171f028acfab9c7c00e9dde (diff)
inet: Hide route peer accesses behind helpers.
We encode the pointer(s) into an unsigned long with one state bit. The state bit is used so we can store the inetpeer tree root to use when resolving the peer later. Later the peer roots will be per-FIB table, and this change works to facilitate that. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inetpeer.h')
-rw-r--r--include/net/inetpeer.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index b84b32fd5df1..d432489e7109 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -71,6 +71,60 @@ struct inet_peer_base {
int total;
};
+#define INETPEER_BASE_BIT 0x1UL
+
+static inline struct inet_peer *inetpeer_ptr(unsigned long val)
+{
+ BUG_ON(val & INETPEER_BASE_BIT);
+ return (struct inet_peer *) val;
+}
+
+static inline struct inet_peer_base *inetpeer_base_ptr(unsigned long val)
+{
+ if (!(val & INETPEER_BASE_BIT))
+ return NULL;
+ val &= ~INETPEER_BASE_BIT;
+ return (struct inet_peer_base *) val;
+}
+
+static inline bool inetpeer_ptr_is_peer(unsigned long val)
+{
+ return !(val & INETPEER_BASE_BIT);
+}
+
+static inline void __inetpeer_ptr_set_peer(unsigned long *val, struct inet_peer *peer)
+{
+ /* This implicitly clears INETPEER_BASE_BIT */
+ *val = (unsigned long) peer;
+}
+
+static inline bool inetpeer_ptr_set_peer(unsigned long *ptr, struct inet_peer *peer)
+{
+ unsigned long val = (unsigned long) peer;
+ unsigned long orig = *ptr;
+
+ if (!(orig & INETPEER_BASE_BIT) || !val ||
+ cmpxchg(ptr, orig, val) != orig)
+ return false;
+ return true;
+}
+
+static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base)
+{
+ *ptr = (unsigned long) base | INETPEER_BASE_BIT;
+}
+
+static inline void inetpeer_transfer_peer(unsigned long *to, unsigned long *from)
+{
+ unsigned long val = *from;
+
+ *to = val;
+ if (inetpeer_ptr_is_peer(val)) {
+ struct inet_peer *peer = inetpeer_ptr(val);
+ atomic_inc(&peer->refcnt);
+ }
+}
+
extern void inet_peer_base_init(struct inet_peer_base *);
void inet_initpeers(void) __init;