[NETNS][FRAGS]: Make the mem counter per-namespace.

This is also simple, but introduces more changes, since
then mem counter is altered in more places.

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

3 files changed, 27 insertions, 25 deletions

diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 4fec0b911f85..ad79ae0c0264 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -63,8 +63,6 @@ void inet_frags_init(struct inet_frags *f)
         f->rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^
                                    (jiffies ^ (jiffies >> 6)));
 
-        atomic_set(&f->mem, 0);
-
         setup_timer(&f->secret_timer, inet_frag_secret_rebuild,
                         (unsigned long)f);
         f->secret_timer.expires = jiffies + f->ctl->secret_interval;
@@ -75,6 +73,7 @@ EXPORT_SYMBOL(inet_frags_init);
 void inet_frags_init_net(struct netns_frags *nf)
 {
         nf->nqueues = 0;
+        atomic_set(&nf->mem, 0);
 }
 EXPORT_SYMBOL(inet_frags_init_net);
 
@@ -107,13 +106,13 @@ void inet_frag_kill(struct inet_frag_queue *fq, struct inet_frags *f)
 
 EXPORT_SYMBOL(inet_frag_kill);
 
-static inline void frag_kfree_skb(struct inet_frags *f, struct sk_buff *skb,
-                                                int *work)
+static inline void frag_kfree_skb(struct netns_frags *nf, struct inet_frags *f,
+                struct sk_buff *skb, int *work)
 {
         if (work)
                 *work -= skb->truesize;
 
-        atomic_sub(skb->truesize, &f->mem);
+        atomic_sub(skb->truesize, &nf->mem);
         if (f->skb_free)
                 f->skb_free(skb);
         kfree_skb(skb);
@@ -123,22 +122,24 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
                                         int *work)
 {
         struct sk_buff *fp;
+        struct netns_frags *nf;
 
         BUG_TRAP(q->last_in & COMPLETE);
         BUG_TRAP(del_timer(&q->timer) == 0);
 
         /* Release all fragment data. */
         fp = q->fragments;
+        nf = q->net;
         while (fp) {
                 struct sk_buff *xp = fp->next;
 
-                frag_kfree_skb(f, fp, work);
+                frag_kfree_skb(nf, f, fp, work);
                 fp = xp;
         }
 
         if (work)
                 *work -= f->qsize;
-        atomic_sub(f->qsize, &f->mem);
+        atomic_sub(f->qsize, &nf->mem);
 
         if (f->destructor)
                 f->destructor(q);
@@ -147,12 +148,12 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
 }
 EXPORT_SYMBOL(inet_frag_destroy);
 
-int inet_frag_evictor(struct inet_frags *f)
+int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f)
 {
         struct inet_frag_queue *q;
         int work, evicted = 0;
 
-        work = atomic_read(&f->mem) - f->ctl->low_thresh;
+        work = atomic_read(&nf->mem) - f->ctl->low_thresh;
         while (work > 0) {
                 read_lock(&f->lock);
                 if (list_empty(&f->lru_list)) {
@@ -226,7 +227,7 @@ static struct inet_frag_queue *inet_frag_alloc(struct netns_frags *nf,
                 return NULL;
 
         f->constructor(q, arg);
-        atomic_add(f->qsize, &f->mem);
+        atomic_add(f->qsize, &nf->mem);
         setup_timer(&q->timer, f->frag_expire, (unsigned long)q);
         spin_lock_init(&q->lock);
         atomic_set(&q->refcnt, 1);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index cd8c83025b48..4f013343cef7 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -100,9 +100,9 @@ int ip_frag_nqueues(struct net *net)
         return net->ipv4.frags.nqueues;
 }
 
-int ip_frag_mem(void)
+int ip_frag_mem(struct net *net)
 {
-        return atomic_read(&ip4_frags.mem);
+        return atomic_read(&net->ipv4.frags.mem);
 }
 
 static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
@@ -142,11 +142,12 @@ static int ip4_frag_match(struct inet_frag_queue *q, void *a)
 }
 
 /* Memory Tracking Functions. */
-static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work)
+static __inline__ void frag_kfree_skb(struct netns_frags *nf,
+                struct sk_buff *skb, int *work)
 {
         if (work)
                 *work -= skb->truesize;
-        atomic_sub(skb->truesize, &ip4_frags.mem);
+        atomic_sub(skb->truesize, &nf->mem);
         kfree_skb(skb);
 }
 
@@ -192,11 +193,11 @@ static void ipq_kill(struct ipq *ipq)
 /* Memory limiting on fragments.  Evictor trashes the oldest
  * fragment queue until we are back under the threshold.
  */
-static void ip_evictor(void)
+static void ip_evictor(struct net *net)
 {
         int evicted;
 
-        evicted = inet_frag_evictor(&ip4_frags);
+        evicted = inet_frag_evictor(&net->ipv4.frags, &ip4_frags);
         if (evicted)
                 IP_ADD_STATS_BH(IPSTATS_MIB_REASMFAILS, evicted);
 }
@@ -294,7 +295,7 @@ static int ip_frag_reinit(struct ipq *qp)
         fp = qp->q.fragments;
         do {
                 struct sk_buff *xp = fp->next;
-                frag_kfree_skb(fp, NULL);
+                frag_kfree_skb(qp->q.net, fp, NULL);
                 fp = xp;
         } while (fp);
 
@@ -431,7 +432,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
                                 qp->q.fragments = next;
 
                         qp->q.meat -= free_it->len;
-                        frag_kfree_skb(free_it, NULL);
+                        frag_kfree_skb(qp->q.net, free_it, NULL);
                 }
         }
 
@@ -451,7 +452,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
         }
         qp->q.stamp = skb->tstamp;
         qp->q.meat += skb->len;
-        atomic_add(skb->truesize, &ip4_frags.mem);
+        atomic_add(skb->truesize, &qp->q.net->mem);
         if (offset == 0)
                 qp->q.last_in |= FIRST_IN;
 
@@ -534,12 +535,12 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
                 head->len -= clone->len;
                 clone->csum = 0;
                 clone->ip_summed = head->ip_summed;
-                atomic_add(clone->truesize, &ip4_frags.mem);
+                atomic_add(clone->truesize, &qp->q.net->mem);
         }
 
         skb_shinfo(head)->frag_list = head->next;
         skb_push(head, head->data - skb_network_header(head));
-        atomic_sub(head->truesize, &ip4_frags.mem);
+        atomic_sub(head->truesize, &qp->q.net->mem);
 
         for (fp=head->next; fp; fp = fp->next) {
                 head->data_len += fp->len;
@@ -549,7 +550,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
                 else if (head->ip_summed == CHECKSUM_COMPLETE)
                         head->csum = csum_add(head->csum, fp->csum);
                 head->truesize += fp->truesize;
-                atomic_sub(fp->truesize, &ip4_frags.mem);
+                atomic_sub(fp->truesize, &qp->q.net->mem);
         }
 
         head->next = NULL;
@@ -588,8 +589,8 @@ int ip_defrag(struct sk_buff *skb, u32 user)
 
         net = skb->dev->nd_net;
         /* Start by cleaning up the memory. */
-        if (atomic_read(&ip4_frags.mem) > ip4_frags_ctl.high_thresh)
-                ip_evictor();
+        if (atomic_read(&net->ipv4.frags.mem) > ip4_frags_ctl.high_thresh)
+                ip_evictor(net);
 
         /* Lookup (or create) queue header */
         if ((qp = ip_find(net, ip_hdr(skb), user)) != NULL) {
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index bae32808616e..d63474c6b400 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -62,7 +62,7 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
         seq_printf(seq, "UDPLITE: inuse %d\n", sock_prot_inuse_get(&udplite_prot));
         seq_printf(seq, "RAW: inuse %d\n", sock_prot_inuse_get(&raw_prot));
         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
-                        ip_frag_nqueues(&init_net), ip_frag_mem());
+                        ip_frag_nqueues(&init_net), ip_frag_mem(&init_net));
         return 0;
 }