[NETNS][FRAGS]: Make the LRU list per namespace.

The inet_frags.lru_list is used for evicting only, so we have
to make it per-namespace, to evict only those fragments, who's
namespace exceeded its high threshold, but not the whole hash.
Besides, this helps to avoid long loops  in evictor.

The spinlock is not per-namespace because it protects the
hash table as well, which is global.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 8 insertions, 8 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 1917fbeb362b..3695ff4cfe63 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -4,6 +4,7 @@
 struct netns_frags {
         int                     nqueues;
         atomic_t                mem;
+        struct list_head        lru_list;
 
         /* sysctls */
         int                     timeout;
@@ -32,7 +33,6 @@ struct inet_frag_queue {
 #define INETFRAGS_HASHSZ                64
 
 struct inet_frags {
-        struct list_head        lru_list;
         struct hlist_head       hash[INETFRAGS_HASHSZ];
         rwlock_t                lock;
         u32                     rnd;
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index fcf5252166fa..f1b95e128772 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -57,7 +57,6 @@ void inet_frags_init(struct inet_frags *f)
         for (i = 0; i < INETFRAGS_HASHSZ; i++)
                 INIT_HLIST_HEAD(&f->hash[i]);
 
-        INIT_LIST_HEAD(&f->lru_list);
         rwlock_init(&f->lock);
 
         f->rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^
@@ -74,6 +73,7 @@ void inet_frags_init_net(struct netns_frags *nf)
 {
         nf->nqueues = 0;
         atomic_set(&nf->mem, 0);
+        INIT_LIST_HEAD(&nf->lru_list);
 }
 EXPORT_SYMBOL(inet_frags_init_net);
 
@@ -156,12 +156,12 @@ int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f)
         work = atomic_read(&nf->mem) - nf->low_thresh;
         while (work > 0) {
                 read_lock(&f->lock);
-                if (list_empty(&f->lru_list)) {
+                if (list_empty(&nf->lru_list)) {
                         read_unlock(&f->lock);
                         break;
                 }
 
-                q = list_first_entry(&f->lru_list,
+                q = list_first_entry(&nf->lru_list,
                                 struct inet_frag_queue, lru_list);
                 atomic_inc(&q->refcnt);
                 read_unlock(&f->lock);
@@ -211,7 +211,7 @@ static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
 
         atomic_inc(&qp->refcnt);
         hlist_add_head(&qp->list, &f->hash[hash]);
-        list_add_tail(&qp->lru_list, &f->lru_list);
+        list_add_tail(&qp->lru_list, &nf->lru_list);
         nf->nqueues++;
         write_unlock(&f->lock);
         return qp;
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 00646ed451f5..29b4b0972e44 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -441,7 +441,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
                 return ip_frag_reasm(qp, prev, dev);
 
         write_lock(&ip4_frags.lock);
-        list_move_tail(&qp->q.lru_list, &ip4_frags.lru_list);
+        list_move_tail(&qp->q.lru_list, &qp->q.net->lru_list);
         write_unlock(&ip4_frags.lock);
         return -EINPROGRESS;
 
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 6eed991a4a3f..022da6ce4c0f 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -385,7 +385,7 @@ static int nf_ct_frag6_queue(struct nf_ct_frag6_queue *fq, struct sk_buff *skb,
                 fq->q.last_in |= FIRST_IN;
         }
         write_lock(&nf_frags.lock);
-        list_move_tail(&fq->q.lru_list, &nf_frags.lru_list);
+        list_move_tail(&fq->q.lru_list, &nf_init_frags.lru_list);
         write_unlock(&nf_frags.lock);
         return 0;
 
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 852070087307..0c4bc46dee0c 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -424,7 +424,7 @@ static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
                 return ip6_frag_reasm(fq, prev, dev);
 
         write_lock(&ip6_frags.lock);
-        list_move_tail(&fq->q.lru_list, &ip6_frags.lru_list);
+        list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
         write_unlock(&ip6_frags.lock);
         return -1;