[IPV6]: ROUTE: Convert rt6_cow() to rt6_alloc_cow().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index cd60bcc..061a7bb 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -397,10 +397,6 @@ int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh,
        return err;
 }
 
-/* No rt6_lock! If COW failed, the function returns dead route entry
-   with dst->error set to errno value.
- */
-
 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
                                      struct in6_addr *saddr)
 {
@@ -439,26 +435,6 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *dad
        return rt;
 }
 
-static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
-                               struct in6_addr *saddr, struct netlink_skb_parms *req)
-{
-       struct rt6_info *rt = rt6_alloc_cow(ort, daddr, saddr);
-       int err;
-
-       if (!rt) {
-               dst_hold(&ip6_null_entry.u.dst);
-               return &ip6_null_entry;
-       }
-
-       dst_hold(&rt->u.dst);
-
-       err = ip6_ins_rt(rt, NULL, NULL, req);
-       if (err)
-               rt->u.dst.error = err;
-
-       return rt;
-}
-
 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
 {
        struct rt6_info *rt = ip6_rt_copy(ort);
@@ -518,15 +494,23 @@ restart:
 
        if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
                struct rt6_info *nrt;
+               int err;
 
-               nrt = rt6_cow(rt, &skb->nh.ipv6h->daddr,
-                             &skb->nh.ipv6h->saddr,
-                             &NETLINK_CB(skb));
+               nrt = rt6_alloc_cow(rt, &skb->nh.ipv6h->daddr,
+                                   &skb->nh.ipv6h->saddr);
 
                dst_release(&rt->u.dst);
-               rt = nrt;
+               rt = nrt ? : &ip6_null_entry;
+
+               dst_hold(&rt->u.dst);
+               if (nrt) {
+                       err = ip6_ins_rt(nrt, NULL, NULL,
+                                        &NETLINK_CB(skb));
+                       if (!err)
+                               goto out2;
+               }
 
-               if (rt->u.dst.error != -EEXIST || --attempts <= 0)
+               if (--attempts <= 0)
                        goto out2;
 
                /* Race condition! In the gap, when rt6_lock was
@@ -582,13 +566,21 @@ restart:
 
        if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
                struct rt6_info *nrt;
+               int err;
 
-               nrt = rt6_cow(rt, &fl->fl6_dst, &fl->fl6_src, NULL);
+               nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
 
                dst_release(&rt->u.dst);
-               rt = nrt;
+               rt = nrt ? : &ip6_null_entry;
 
-               if (rt->u.dst.error != -EEXIST || --attempts <= 0)
+               dst_hold(&rt->u.dst);
+               if (nrt) {
+                       err = ip6_ins_rt(nrt, NULL, NULL, NULL);
+                       if (!err)
+                               goto out2;
+               }
+
+               if (--attempts <= 0)
                        goto out2;
 
                /* Race condition! In the gap, when rt6_lock was
@@ -597,6 +589,7 @@ restart:
                dst_release(&rt->u.dst);
                goto relookup;
        }
+
 out2:
        rt->u.dst.lastuse = jiffies;
        rt->u.dst.__use++;