[Devel] [PATCH 2.6.25] net: move trie_local and trie_main into the proc iterator

[Denis V. Lunev]

From: Eric W. Biederman <ebiederm at xmission.com>

We only use these variables when displaying the trie in proc so
place them into the iterator to make this explicit.  We should
probably do something smarter to handle the CONFIG_IP_MULTIPLE_TABLES
case but at least this makes it clear that the silliness is limited
to the display in /proc.

Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
Signed-off-by: Denis V. Lunev <den at openvz.org>
---
 net/ipv4/fib_trie.c |   47 ++++++++++++++++++++++++++++++++++-------------
 1 files changed, 34 insertions(+), 13 deletions(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 8d8c291..6385cca 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -164,7 +164,6 @@ static struct tnode *halve(struct trie *t, struct tnode *tn);
 static void tnode_free(struct tnode *tn);
 
 static struct kmem_cache *fn_alias_kmem __read_mostly;
-static struct trie *trie_local = NULL, *trie_main = NULL;
 
 static inline struct tnode *node_parent(struct node *node)
 {
@@ -2000,11 +1999,6 @@ struct fib_table * __init fib_hash_init(u32 id)
 	trie_init(t);
 
 	if (id == RT_TABLE_LOCAL)
-		trie_local = t;
-	else if (id == RT_TABLE_MAIN)
-		trie_main = t;
-
-	if (id == RT_TABLE_LOCAL)
 		printk(KERN_INFO "IPv4 FIB: Using LC-trie version %s\n", VERSION);
 
 	return tb;
@@ -2013,6 +2007,7 @@ struct fib_table * __init fib_hash_init(u32 id)
 #ifdef CONFIG_PROC_FS
 /* Depth first Trie walk iterator */
 struct fib_trie_iter {
+	struct trie *trie_local, *trie_main;
 	struct tnode *tnode;
 	struct trie *trie;
 	unsigned index;
@@ -2179,7 +2174,20 @@ static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat)
 
 static int fib_triestat_seq_show(struct seq_file *seq, void *v)
 {
+	struct trie *trie_local, *trie_main;
 	struct trie_stat *stat;
+	struct fib_table *tb;
+
+	trie_local = NULL;
+	tb = fib_get_table(RT_TABLE_LOCAL);
+	if (tb)
+		trie_local = (struct trie *) tb->tb_data;
+
+	trie_main = NULL;
+	tb = fib_get_table(RT_TABLE_MAIN);
+	if (tb)
+		trie_main = (struct trie *) tb->tb_data;
+
 
 	stat = kmalloc(sizeof(*stat), GFP_KERNEL);
 	if (!stat)
@@ -2223,13 +2231,13 @@ static struct node *fib_trie_get_idx(struct fib_trie_iter *iter,
 	loff_t idx = 0;
 	struct node *n;
 
-	for (n = fib_trie_get_first(iter, trie_local);
+	for (n = fib_trie_get_first(iter, iter->trie_local);
 	     n; ++idx, n = fib_trie_get_next(iter)) {
 		if (pos == idx)
 			return n;
 	}
 
-	for (n = fib_trie_get_first(iter, trie_main);
+	for (n = fib_trie_get_first(iter, iter->trie_main);
 	     n; ++idx, n = fib_trie_get_next(iter)) {
 		if (pos == idx)
 			return n;
@@ -2239,10 +2247,23 @@ static struct node *fib_trie_get_idx(struct fib_trie_iter *iter,
 
 static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos)
 {
+	struct fib_trie_iter *iter = seq->private;
+	struct fib_table *tb;
+
+	if (!iter->trie_local) {
+		tb = fib_get_table(RT_TABLE_LOCAL);
+		if (tb)
+			iter->trie_local = (struct trie *) tb->tb_data;
+	}
+	if (!iter->trie_main) {
+		tb = fib_get_table(RT_TABLE_MAIN);
+		if (tb)
+			iter->trie_main = (struct trie *) tb->tb_data;
+	}
 	rcu_read_lock();
 	if (*pos == 0)
 		return SEQ_START_TOKEN;
-	return fib_trie_get_idx(seq->private, *pos - 1);
+	return fib_trie_get_idx(iter, *pos - 1);
 }
 
 static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos)
@@ -2260,8 +2281,8 @@ static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 		return v;
 
 	/* continue scan in next trie */
-	if (iter->trie == trie_local)
-		return fib_trie_get_first(iter, trie_main);
+	if (iter->trie == iter->trie_local)
+		return fib_trie_get_first(iter, iter->trie_main);
 
 	return NULL;
 }
@@ -2327,7 +2348,7 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v)
 		return 0;
 
 	if (!node_parent(n)) {
-		if (iter->trie == trie_local)
+		if (iter->trie == iter->trie_local)
 			seq_puts(seq, "<local>:\n");
 		else
 			seq_puts(seq, "<main>:\n");
@@ -2426,7 +2447,7 @@ static int fib_route_seq_show(struct seq_file *seq, void *v)
 		return 0;
 	}
 
-	if (iter->trie == trie_local)
+	if (iter->trie == iter->trie_local)
 		return 0;
 	if (IS_TNODE(l))
 		return 0;
-- 
1.5.3.rc5