[NET] NETNS: Omit seq_net_private->net without CONFIG_NET_NS.

Without CONFIG_NET_NS, no namespace other than &init_net exists,
no need to store net in seq_net_private.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

12 files changed, 53 insertions, 47 deletions

diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 4caa5f774fb7..13cd7835d0df 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -44,7 +44,9 @@ int seq_open_net(struct inode *ino, struct file *f,
                 put_net(net);
                 return -ENOMEM;
         }
+#ifdef CONFIG_NET_NS
         p->net = net;
+#endif
         return 0;
 }
 EXPORT_SYMBOL_GPL(seq_open_net);
@@ -52,12 +54,10 @@ EXPORT_SYMBOL_GPL(seq_open_net);
 int seq_release_net(struct inode *ino, struct file *f)
 {
         struct seq_file *seq;
-        struct seq_net_private *p;
 
         seq = f->private_data;
-        p = seq->private;
 
-        put_net(p->net);
+        put_net(seq_file_net(seq));
         seq_release_private(ino, f);
         return 0;
 }
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 67c2563961f3..d870a8253769 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -5,6 +5,7 @@
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/mutex.h>
+#include <net/net_namespace.h>
 
 struct seq_operations;
 struct file;
@@ -64,7 +65,9 @@ extern struct list_head *seq_list_next(void *v, struct list_head *head,
 
 struct net;
 struct seq_net_private {
+#ifdef CONFIG_NET_NS
         struct net *net;
+#endif
 };
 
 int seq_open_net(struct inode *, struct file *,
@@ -72,7 +75,11 @@ int seq_open_net(struct inode *, struct file *,
 int seq_release_net(struct inode *, struct file *);
 static inline struct net *seq_file_net(struct seq_file *seq)
 {
+#ifdef CONFIG_NET_NS
         return ((struct seq_net_private *)seq->private)->net;
+#else
+        return &init_net;
+#endif
 }
 
 #endif
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 065fbac7ecd3..b8d491fb4b42 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2145,7 +2145,7 @@ EXPORT_SYMBOL(__neigh_for_each_release);
 static struct neighbour *neigh_get_first(struct seq_file *seq)
 {
         struct neigh_seq_state *state = seq->private;
-        struct net *net = state->p.net;
+        struct net *net = seq_file_net(seq);
         struct neigh_table *tbl = state->tbl;
         struct neighbour *n = NULL;
         int bucket = state->bucket;
@@ -2186,7 +2186,7 @@ static struct neighbour *neigh_get_next(struct seq_file *seq,
                                         loff_t *pos)
 {
         struct neigh_seq_state *state = seq->private;
-        struct net *net = state->p.net;
+        struct net *net = seq_file_net(seq);
         struct neigh_table *tbl = state->tbl;
 
         if (state->neigh_sub_iter) {
@@ -2246,7 +2246,7 @@ static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos)
 static struct pneigh_entry *pneigh_get_first(struct seq_file *seq)
 {
         struct neigh_seq_state *state = seq->private;
-        struct net * net = state->p.net;
+        struct net *net = seq_file_net(seq);
         struct neigh_table *tbl = state->tbl;
         struct pneigh_entry *pn = NULL;
         int bucket = state->bucket;
@@ -2269,7 +2269,7 @@ static struct pneigh_entry *pneigh_get_next(struct seq_file *seq,
                                             loff_t *pos)
 {
         struct neigh_seq_state *state = seq->private;
-        struct net * net = state->p.net;
+        struct net *net = seq_file_net(seq);
         struct neigh_table *tbl = state->tbl;
 
         pn = pn->next;
diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index 8d58d85dfac6..02088deb0461 100644
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -821,7 +821,7 @@ static struct fib_alias *fib_get_first(struct seq_file *seq)
         struct fib_table *main_table;
         struct fn_hash *table;
 
-        main_table = fib_get_table(iter->p.net, RT_TABLE_MAIN);
+        main_table = fib_get_table(seq_file_net(seq), RT_TABLE_MAIN);
         table = (struct fn_hash *)main_table->tb_data;
 
         iter->bucket    = 0;
@@ -959,11 +959,10 @@ static struct fib_alias *fib_get_idx(struct seq_file *seq, loff_t pos)
 static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
         __acquires(fib_hash_lock)
 {
-        struct fib_iter_state *iter = seq->private;
         void *v = NULL;
 
         read_lock(&fib_hash_lock);
-        if (fib_get_table(iter->p.net, RT_TABLE_MAIN))
+        if (fib_get_table(seq_file_net(seq), RT_TABLE_MAIN))
                 v = *pos ? fib_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
         return v;
 }
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index ce6cb34e28e1..9e491e70e855 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -2279,9 +2279,10 @@ static const struct file_operations fib_triestat_fops = {
         .release = fib_triestat_seq_release,
 };
 
-static struct node *fib_trie_get_idx(struct fib_trie_iter *iter, loff_t pos)
+static struct node *fib_trie_get_idx(struct seq_file *seq, loff_t pos)
 {
-        struct net *net = iter->p.net;
+        struct fib_trie_iter *iter = seq->private;
+        struct net *net = seq_file_net(seq);
         loff_t idx = 0;
         unsigned int h;
 
@@ -2309,16 +2310,14 @@ static struct node *fib_trie_get_idx(struct fib_trie_iter *iter, loff_t pos)
 static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos)
         __acquires(RCU)
 {
-        struct fib_trie_iter *iter = seq->private;
-
         rcu_read_lock();
-        return fib_trie_get_idx(iter, *pos);
+        return fib_trie_get_idx(seq, *pos);
 }
 
 static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
         struct fib_trie_iter *iter = seq->private;
-        struct net *net = iter->p.net;
+        struct net *net = seq_file_net(seq);
         struct fib_table *tb = iter->tb;
         struct hlist_node *tb_node;
         unsigned int h;
@@ -2513,7 +2512,7 @@ static void *fib_route_seq_start(struct seq_file *seq, loff_t *pos)
         struct fib_table *tb;
 
         rcu_read_lock();
-        tb = fib_get_table(iter->p.net, RT_TABLE_MAIN);
+        tb = fib_get_table(seq_file_net(seq), RT_TABLE_MAIN);
         if (!tb)
                 return NULL;
 
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index be19a4048d7c..25dc8b38cac3 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -856,7 +856,7 @@ static struct sock *raw_get_first(struct seq_file *seq)
                 struct hlist_node *node;
 
                 sk_for_each(sk, node, &state->h->ht[state->bucket])
-                        if (sock_net(sk) == state->p.net)
+                        if (sock_net(sk) == seq_file_net(seq))
                                 goto found;
         }
         sk = NULL;
@@ -872,7 +872,7 @@ static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
                 sk = sk_next(sk);
 try_again:
                 ;
-        } while (sk && sock_net(sk) != state->p.net);
+        } while (sk && sock_net(sk) != seq_file_net(seq));
 
         if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
                 sk = sk_head(&state->h->ht[state->bucket]);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 194f5cca3121..eab8d75e5222 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -276,15 +276,16 @@ struct rt_cache_iter_state {
         int genid;
 };
 
-static struct rtable *rt_cache_get_first(struct rt_cache_iter_state *st)
+static struct rtable *rt_cache_get_first(struct seq_file *seq)
 {
+        struct rt_cache_iter_state *st = seq->private;
         struct rtable *r = NULL;
 
         for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) {
                 rcu_read_lock_bh();
                 r = rcu_dereference(rt_hash_table[st->bucket].chain);
                 while (r) {
-                        if (dev_net(r->u.dst.dev) == st->p.net &&
+                        if (dev_net(r->u.dst.dev) == seq_file_net(seq) &&
                             r->rt_genid == st->genid)
                                 return r;
                         r = rcu_dereference(r->u.dst.rt_next);
@@ -294,9 +295,10 @@ static struct rtable *rt_cache_get_first(struct rt_cache_iter_state *st)
         return r;
 }
 
-static struct rtable *__rt_cache_get_next(struct rt_cache_iter_state *st,
+static struct rtable *__rt_cache_get_next(struct seq_file *seq,
                                           struct rtable *r)
 {
+        struct rt_cache_iter_state *st = seq->private;
         r = r->u.dst.rt_next;
         while (!r) {
                 rcu_read_unlock_bh();
@@ -308,11 +310,12 @@ static struct rtable *__rt_cache_get_next(struct rt_cache_iter_state *st,
         return rcu_dereference(r);
 }
 
-static struct rtable *rt_cache_get_next(struct rt_cache_iter_state *st,
+static struct rtable *rt_cache_get_next(struct seq_file *seq,
                                         struct rtable *r)
 {
-        while ((r = __rt_cache_get_next(st, r)) != NULL) {
-                if (dev_net(r->u.dst.dev) != st->p.net)
+        struct rt_cache_iter_state *st = seq->private;
+        while ((r = __rt_cache_get_next(seq, r)) != NULL) {
+                if (dev_net(r->u.dst.dev) != seq_file_net(seq))
                         continue;
                 if (r->rt_genid == st->genid)
                         break;
@@ -320,12 +323,12 @@ static struct rtable *rt_cache_get_next(struct rt_cache_iter_state *st,
         return r;
 }
 
-static struct rtable *rt_cache_get_idx(struct rt_cache_iter_state *st, loff_t pos)
+static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos)
 {
-        struct rtable *r = rt_cache_get_first(st);
+        struct rtable *r = rt_cache_get_first(seq);
 
         if (r)
-                while (pos && (r = rt_cache_get_next(st, r)))
+                while (pos && (r = rt_cache_get_next(seq, r)))
                         --pos;
         return pos ? NULL : r;
 }
@@ -333,9 +336,8 @@ static struct rtable *rt_cache_get_idx(struct rt_cache_iter_state *st, loff_t po
 static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
 {
         struct rt_cache_iter_state *st = seq->private;
-
         if (*pos)
-                return rt_cache_get_idx(st, *pos - 1);
+                return rt_cache_get_idx(seq, *pos - 1);
         st->genid = atomic_read(&rt_genid);
         return SEQ_START_TOKEN;
 }
@@ -343,12 +345,11 @@ static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
 static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
         struct rtable *r;
-        struct rt_cache_iter_state *st = seq->private;
 
         if (v == SEQ_START_TOKEN)
-                r = rt_cache_get_first(st);
+                r = rt_cache_get_first(seq);
         else
-                r = rt_cache_get_next(st, v);
+                r = rt_cache_get_next(seq, v);
         ++*pos;
         return r;
 }
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f2c90f145cbb..ac5d4f4b6312 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2766,7 +2766,7 @@ static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
 {
         struct inet6_ifaddr *ifa = NULL;
         struct if6_iter_state *state = seq->private;
-        struct net *net = state->p.net;
+        struct net *net = seq_file_net(seq);
 
         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
                 ifa = inet6_addr_lst[state->bucket];
@@ -2782,7 +2782,7 @@ static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
 {
         struct if6_iter_state *state = seq->private;
-        struct net *net = state->p.net;
+        struct net *net = seq_file_net(seq);
 
         ifa = ifa->lst_next;
 try_again:
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 20a3d8e2f6c6..d810cff818cf 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -2355,7 +2355,7 @@ static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
 {
         struct ifmcaddr6 *im = NULL;
         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
-        struct net *net = state->p.net;
+        struct net *net = seq_file_net(seq);
 
         state->idev = NULL;
         for_each_netdev(net, state->dev) {
@@ -2486,7 +2486,7 @@ static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
         struct ip6_sf_list *psf = NULL;
         struct ifmcaddr6 *im = NULL;
         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
-        struct net *net = state->p.net;
+        struct net *net = seq_file_net(seq);
 
         state->idev = NULL;
         state->im = NULL;
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index a6792089fcf9..0bd95680a494 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -727,7 +727,7 @@ struct xt_names_priv {
 static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos)
 {
         struct xt_names_priv *priv = seq->private;
-        struct net *net = priv->p.net;
+        struct net *net = seq_file_net(seq);
         int af = priv->af;
 
         mutex_lock(&xt[af].mutex);
@@ -737,7 +737,7 @@ static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos)
 static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
         struct xt_names_priv *priv = seq->private;
-        struct net *net = priv->p.net;
+        struct net *net = seq_file_net(seq);
         int af = priv->af;
 
         return seq_list_next(v, &net->xt.tables[af], pos);
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 712a7bff8560..1d16d95dfaaf 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1758,7 +1758,7 @@ static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos)
 
                 for (j = 0; j <= hash->mask; j++) {
                         sk_for_each(s, node, &hash->table[j]) {
-                                if (sock_net(s) != iter->p.net)
+                                if (sock_net(s) != seq_file_net(seq))
                                         continue;
                                 if (off == pos) {
                                         iter->link = i;
@@ -1794,7 +1794,7 @@ static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos)
         s = v;
         do {
                 s = sk_next(s);
-        } while (s && (sock_net(s) != iter->p.net));
+        } while (s && sock_net(s) != seq_file_net(seq));
         if (s)
                 return s;
 
@@ -1806,7 +1806,7 @@ static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 
                 for (; j <= hash->mask; j++) {
                         s = sk_head(&hash->table[j]);
-                        while (s && sock_net(s) != iter->p.net)
+                        while (s && sock_net(s) != seq_file_net(seq))
                                 s = sk_next(s);
                         if (s) {
                                 iter->link = i;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index cb9d0cb5f270..4a4793051bcb 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2016,13 +2016,14 @@ struct unix_iter_state {
         struct seq_net_private p;
         int i;
 };
-static struct sock *unix_seq_idx(struct unix_iter_state *iter, loff_t pos)
+static struct sock *unix_seq_idx(struct seq_file *seq, loff_t pos)
 {
+        struct unix_iter_state *iter = seq->private;
         loff_t off = 0;
         struct sock *s;
 
         for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) {
-                if (sock_net(s) != iter->p.net)
+                if (sock_net(s) != seq_file_net(seq))
                         continue;
                 if (off == pos)
                         return s;
@@ -2035,9 +2036,8 @@ static struct sock *unix_seq_idx(struct unix_iter_state *iter, loff_t pos)
 static void *unix_seq_start(struct seq_file *seq, loff_t *pos)
         __acquires(unix_table_lock)
 {
-        struct unix_iter_state *iter = seq->private;
         spin_lock(&unix_table_lock);
-        return *pos ? unix_seq_idx(iter, *pos - 1) : ((void *) 1);
+        return *pos ? unix_seq_idx(seq, *pos - 1) : ((void *) 1);
 }
 
 static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos)
@@ -2050,7 +2050,7 @@ static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos)
                 sk = first_unix_socket(&iter->i);
         else
                 sk = next_unix_socket(&iter->i, sk);
-        while (sk && (sock_net(sk) != iter->p.net))
+        while (sk && (sock_net(sk) != seq_file_net(seq)))
                 sk = next_unix_socket(&iter->i, sk);
         return sk;
 }