[NET]: Make helper to get dst entry and "use" it

There are many places that get the dst entry, increase the
__use counter and set the "lastuse" time stamp.

Make a helper for this.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/dst.h

@@ -143,6 +143,13 @@ static inline void dst_hold(struct dst_entry * dst)
 	atomic_inc(&dst->__refcnt);
 }
 
+static inline void dst_use(struct dst_entry *dst, unsigned long time)
+{
+	dst_hold(dst);
+	dst->__use++;
+	dst->lastuse = time;
+}
+
 static inline
 struct dst_entry * dst_clone(struct dst_entry * dst)
 {

net/decnet/dn_route.c

@@ -293,9 +293,7 @@ static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route *
 					   dn_rt_hash_table[hash].chain);
 			rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
 
-			rth->u.dst.__use++;
-			dst_hold(&rth->u.dst);
-			rth->u.dst.lastuse = now;
+			dst_use(&rth->u.dst, now);
 			spin_unlock_bh(&dn_rt_hash_table[hash].lock);
 
 			dnrt_drop(rt);
@@ -308,9 +306,7 @@ static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route *
 	rcu_assign_pointer(rt->u.dst.dn_next, dn_rt_hash_table[hash].chain);
 	rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
 
-	dst_hold(&rt->u.dst);
-	rt->u.dst.__use++;
-	rt->u.dst.lastuse = now;
+	dst_use(&rt->u.dst, now);
 	spin_unlock_bh(&dn_rt_hash_table[hash].lock);
 	*rp = rt;
 	return 0;
@@ -1182,9 +1178,7 @@ static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *fl
 			    (flp->mark == rt->fl.mark) &&
 			    (rt->fl.iif == 0) &&
 			    (rt->fl.oif == flp->oif)) {
-				rt->u.dst.lastuse = jiffies;
-				dst_hold(&rt->u.dst);
-				rt->u.dst.__use++;
+				dst_use(&rt->u.dst, jiffies);
 				rcu_read_unlock_bh();
 				*pprt = &rt->u.dst;
 				return 0;
@@ -1456,9 +1450,7 @@ int dn_route_input(struct sk_buff *skb)
 		    (rt->fl.oif == 0) &&
 		    (rt->fl.mark == skb->mark) &&
 		    (rt->fl.iif == cb->iif)) {
-			rt->u.dst.lastuse = jiffies;
-			dst_hold(&rt->u.dst);
-			rt->u.dst.__use++;
+			dst_use(&rt->u.dst, jiffies);
 			rcu_read_unlock();
 			skb->dst = (struct dst_entry *)rt;
 			return 0;

net/ipv4/route.c

@@ -851,9 +851,7 @@ static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp)
 			 */
 			rcu_assign_pointer(rt_hash_table[hash].chain, rth);
 
-			rth->u.dst.__use++;
-			dst_hold(&rth->u.dst);
-			rth->u.dst.lastuse = now;
+			dst_use(&rth->u.dst, now);
 			spin_unlock_bh(rt_hash_lock_addr(hash));
 
 			rt_drop(rt);
@@ -1930,9 +1928,7 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 		    rth->fl.oif == 0 &&
 		    rth->fl.mark == skb->mark &&
 		    rth->fl.fl4_tos == tos) {
-			rth->u.dst.lastuse = jiffies;
-			dst_hold(&rth->u.dst);
-			rth->u.dst.__use++;
+			dst_use(&rth->u.dst, jiffies);
 			RT_CACHE_STAT_INC(in_hit);
 			rcu_read_unlock();
 			skb->dst = (struct dst_entry*)rth;
@@ -2326,9 +2322,7 @@ int __ip_route_output_key(struct rtable **rp, const struct flowi *flp)
 		    rth->fl.mark == flp->mark &&
 		    !((rth->fl.fl4_tos ^ flp->fl4_tos) &
 			    (IPTOS_RT_MASK | RTO_ONLINK))) {
-			rth->u.dst.lastuse = jiffies;
-			dst_hold(&rth->u.dst);
-			rth->u.dst.__use++;
+			dst_use(&rth->u.dst, jiffies);
 			RT_CACHE_STAT_INC(out_hit);
 			rcu_read_unlock_bh();
 			*rp = rth;

net/ipv6/route.c

@@ -544,12 +544,8 @@ static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table,
 	rt = rt6_device_match(rt, fl->oif, flags);
 	BACKTRACK(&fl->fl6_src);
 out:
-	dst_hold(&rt->u.dst);
+	dst_use(&rt->u.dst, jiffies);
 	read_unlock_bh(&table->tb6_lock);
-
-	rt->u.dst.lastuse = jiffies;
-	rt->u.dst.__use++;
-
 	return rt;
 
 }