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Date: Sun, 20 Oct 2002 03:10:31 -0300
From: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
To: "David S. Miller" <davem@redhat.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [PATCH] ipv4: only produce one record per fib_seq_sholl call
Message-ID: <20021020061031.GA15857@conectiva.com.br>
Mail-Followup-To: Arnaldo Carvalho de Melo <acme@conectiva.com.br>,
	"David S. Miller" <davem@redhat.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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David,

	Here it is, fib code fixed and moved back to fib implementation,
please consider pulling from:

master.kernel.org:/home/acme/BK/net-2.5

Best Regards,

- Arnaldo

You can import this changeset into BK by piping this whole message to:
'| bk receive [path to repository]' or apply the patch as usual.

===================================================================


ChangeSet@1.809, 2002-10-20 03:03:19-03:00, acme@conectiva.com.br
  o ipv4: only produce one record per fib_seq_sholl call
  
  Also move the fib code back to the fib implementation, and that will
  now be done for udp and arp, then finally burying the ip_proc stillborn.


 include/net/ip.h         |    1 
 include/net/ip_fib.h     |    2 
 net/ipv4/af_inet.c       |    1 
 net/ipv4/fib_hash.c      |  257 ++++++++++++++++++++++++++++++++++++++++-------
 net/ipv4/fib_semantics.c |   41 -------
 net/ipv4/ip_proc.c       |   74 -------------
 6 files changed, 229 insertions(+), 147 deletions(-)


diff -Nru a/include/net/ip.h b/include/net/ip.h
--- a/include/net/ip.h	Sun Oct 20 03:06:50 2002
+++ b/include/net/ip.h	Sun Oct 20 03:06:50 2002
@@ -282,6 +282,7 @@
 extern void	ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport,
 			       u32 info);
 
+extern int ip_seq_release(struct inode *inode, struct file *file);
 extern int ipv4_proc_init(void);
 
 #endif	/* _IP_H */
diff -Nru a/include/net/ip_fib.h b/include/net/ip_fib.h
--- a/include/net/ip_fib.h	Sun Oct 20 03:06:50 2002
+++ b/include/net/ip_fib.h	Sun Oct 20 03:06:50 2002
@@ -129,7 +129,6 @@
 	int		(*tb_dump)(struct fib_table *table, struct sk_buff *skb,
 				     struct netlink_callback *cb);
 	int		(*tb_flush)(struct fib_table *table);
-	int		(*tb_seq_show)(struct fib_table *table, struct seq_file *seq);
 	void		(*tb_select_default)(struct fib_table *table,
 					     const struct flowi *flp, struct fib_result *res);
 
@@ -277,5 +276,6 @@
 #endif
 }
 
+extern int fib_proc_init(void);
 
 #endif  /* _NET_FIB_H */
diff -Nru a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
--- a/net/ipv4/af_inet.c	Sun Oct 20 03:06:50 2002
+++ b/net/ipv4/af_inet.c	Sun Oct 20 03:06:50 2002
@@ -1218,6 +1218,7 @@
 #endif
 
 	ipv4_proc_init();
+	fib_proc_init();
 	return 0;
 }
 
diff -Nru a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
--- a/net/ipv4/fib_hash.c	Sun Oct 20 03:06:50 2002
+++ b/net/ipv4/fib_hash.c	Sun Oct 20 03:06:50 2002
@@ -745,37 +745,6 @@
 }
 
 
-#ifdef CONFIG_PROC_FS
-
-static int fn_hash_seq_show(struct fib_table *tb, struct seq_file *seq)
-{
-	struct fn_hash *table = (struct fn_hash *)tb->tb_data;
-	struct fn_zone *fz;
-
-	read_lock(&fib_hash_lock);
-	for (fz = table->fn_zone_list; fz; fz = fz->fz_next) {
-		int i;
-		struct fib_node *f;
-		int maxslot = fz->fz_divisor;
-		struct fib_node **fp = fz->fz_hash;
-
-		if (!fz->fz_nent)
-			continue;
-
-		for (i = 0; i < maxslot; i++, fp++)
-			for (f = *fp; f; f = f->fn_next)
-				fib_node_seq_show(seq, f->fn_type,
-						  f->fn_state & FN_S_ZOMBIE,
-						  FIB_INFO(f),
-						  fz_prefix(f->fn_key, fz),
-						  FZ_MASK(fz));
-	}
-	read_unlock(&fib_hash_lock);
-  	return 0;
-}
-#endif
-
-
 static __inline__ int
 fn_hash_dump_bucket(struct sk_buff *skb, struct netlink_callback *cb,
 		     struct fib_table *tb,
@@ -897,9 +866,229 @@
 	tb->tb_flush = fn_hash_flush;
 	tb->tb_select_default = fn_hash_select_default;
 	tb->tb_dump = fn_hash_dump;
-#ifdef CONFIG_PROC_FS
-	tb->tb_seq_show = fn_hash_seq_show;
-#endif
 	memset(tb->tb_data, 0, sizeof(struct fn_hash));
 	return tb;
 }
+
+/* ------------------------------------------------------------------------ */
+#ifdef CONFIG_PROC_FS
+
+struct fib_iter_state {
+	struct fn_zone	*zone;
+	int		bucket;
+	struct fib_node **hash;
+	struct fib_node *node;
+};
+
+static __inline__ struct fib_node *fib_get_first(struct seq_file *seq)
+{
+	struct fib_iter_state* iter = seq->private;
+	struct fn_hash *table = (struct fn_hash *)ip_fib_main_table->tb_data;
+
+	iter->bucket = 0;
+	iter->hash   = NULL;
+	iter->node   = NULL;
+
+	for (iter->zone = table->fn_zone_list; iter->zone;
+	     iter->zone = iter->zone->fz_next) {
+		int maxslot;
+
+		if (!iter->zone->fz_next)
+			continue;
+
+		iter->hash = iter->zone->fz_hash;
+		maxslot = iter->zone->fz_divisor;
+
+		for (iter->bucket = 0; iter->bucket < maxslot;
+		     ++iter->bucket, ++iter->hash) {
+			iter->node = *iter->hash;
+
+			if (iter->node)
+				goto out;
+		}
+	}
+out:
+	return iter->node;
+}
+
+static __inline__ struct fib_node *fib_get_next(struct seq_file *seq)
+{
+	struct fib_iter_state* iter = seq->private;
+
+	if (iter->node)
+		iter->node = iter->node->fn_next;
+
+	if (iter->node)
+		goto out;
+
+	if (!iter->zone)
+		goto out;
+
+	for (;;) {
+		int maxslot;
+
+		maxslot = iter->zone->fz_divisor;
+
+		while (++iter->bucket < maxslot) {
+			iter->node = *++iter->hash;
+
+			if (iter->node)
+				goto out;
+		}
+
+		for (;;) {
+			iter->zone = iter->zone->fz_next;
+
+			if (!iter->zone)
+				goto out;
+			if (iter->zone->fz_next);
+				break;
+		}
+		
+		iter->hash = iter->zone->fz_hash;
+		iter->bucket = 0;
+		iter->node = *iter->hash;
+		if (iter->node)
+			break;
+	}
+out:
+	return iter->node;
+}
+
+static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	void *v = NULL;
+
+	read_lock(&fib_hash_lock);
+	if (ip_fib_main_table)
+		v = *pos ? fib_get_next(seq) : (void *)1;
+	return v;
+}
+
+static void *fib_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	++*pos;
+	return v == (void *)1 ? fib_get_first(seq) : fib_get_next(seq);
+}
+
+static void fib_seq_stop(struct seq_file *seq, void *v)
+{
+	read_unlock(&fib_hash_lock);
+}
+
+static unsigned fib_flag_trans(int type, int dead, u32 mask, struct fib_info *fi)
+{
+	static unsigned type2flags[RTN_MAX + 1] = {
+		[7] = RTF_REJECT, [8] = RTF_REJECT,
+	};
+	unsigned flags = type2flags[type];
+
+	if (fi && fi->fib_nh->nh_gw)
+		flags |= RTF_GATEWAY;
+	if (mask == 0xFFFFFFFF)
+		flags |= RTF_HOST;
+	if (!dead)
+		flags |= RTF_UP;
+	return flags;
+}
+
+/* 
+ *	This outputs /proc/net/route.
+ *
+ *	It always works in backward compatibility mode.
+ *	The format of the file is not supposed to be changed.
+ */
+static int fib_seq_show(struct seq_file *seq, void *v)
+{
+	struct fib_iter_state* iter;
+	char bf[128];
+	u32 prefix, mask;
+	unsigned flags;
+	struct fib_node *f;
+	struct fib_info *fi;
+
+	if (v == (void *)1) {
+		seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
+			   "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU"
+			   "\tWindow\tIRTT");
+		goto out;
+	}
+
+	f	= v;
+	fi	= FIB_INFO(f);
+	iter	= seq->private;
+	prefix	= fz_prefix(f->fn_key, iter->zone);
+	mask	= FZ_MASK(iter->zone);
+	flags	= fib_flag_trans(f->fn_type, f->fn_state & FN_S_ZOMBIE,
+				 mask, fi);
+	if (fi)
+		snprintf(bf, sizeof(bf),
+			 "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
+			 fi->fib_dev ? fi->fib_dev->name : "*", prefix,
+			 fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
+			 mask, fi->fib_advmss + 40, fi->fib_window,
+			 fi->fib_rtt >> 3);
+	else
+		snprintf(bf, sizeof(bf),
+			 "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
+			 prefix, 0, flags, 0, 0, 0, mask, 0, 0, 0);
+	seq_printf(seq, "%-127s\n", bf);
+out:
+	return 0;
+}
+
+static struct seq_operations fib_seq_ops = {
+	.start  = fib_seq_start,
+	.next   = fib_seq_next,
+	.stop   = fib_seq_stop,
+	.show   = fib_seq_show,
+};
+
+static int fib_seq_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	int rc = -ENOMEM;
+	struct fib_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+       
+	if (!s)
+		goto out;
+
+	rc = seq_open(file, &fib_seq_ops);
+	if (rc)
+		goto out_kfree;
+
+	seq	     = file->private_data;
+	seq->private = s;
+	memset(s, 0, sizeof(*s));
+out:
+	return rc;
+out_kfree:
+	kfree(s);
+	goto out;
+}
+
+static struct file_operations fib_seq_fops = {
+	.open           = fib_seq_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.release	= ip_seq_release,
+};
+
+int __init fib_proc_init(void)
+{
+	struct proc_dir_entry *p;
+	int rc = 0;
+
+	p = create_proc_entry("route", S_IRUGO, proc_net);
+	if (p)
+		p->proc_fops = &fib_seq_fops;
+	else
+		rc = -ENOMEM;
+	return rc;
+}
+#else /* CONFIG_PROC_FS */
+int __init fib_proc_init(void)
+{
+	return 0;
+}
+#endif /* CONFIG_PROC_FS */
diff -Nru a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
--- a/net/ipv4/fib_semantics.c	Sun Oct 20 03:06:50 2002
+++ b/net/ipv4/fib_semantics.c	Sun Oct 20 03:06:50 2002
@@ -997,44 +997,3 @@
 	spin_unlock_bh(&fib_multipath_lock);
 }
 #endif
-
-
-#ifdef CONFIG_PROC_FS
-
-static unsigned fib_flag_trans(int type, int dead, u32 mask, struct fib_info *fi)
-{
-	static unsigned type2flags[RTN_MAX+1] = {
-		0, 0, 0, 0, 0, 0, 0, RTF_REJECT, RTF_REJECT, 0, 0, 0
-	};
-	unsigned flags = type2flags[type];
-
-	if (fi && fi->fib_nh->nh_gw)
-		flags |= RTF_GATEWAY;
-	if (mask == 0xFFFFFFFF)
-		flags |= RTF_HOST;
-	if (!dead)
-		flags |= RTF_UP;
-	return flags;
-}
-
-void fib_node_seq_show(struct seq_file *seq, int type, int dead,
-		       struct fib_info *fi, u32 prefix, u32 mask)
-{
-	char bf[128];
-	unsigned flags = fib_flag_trans(type, dead, mask, fi);
-
-	if (fi)
-		snprintf(bf, sizeof(bf),
-			 "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
-			 fi->fib_dev ? fi->fib_dev->name : "*", prefix,
-			 fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
-			 mask, fi->fib_advmss + 40, fi->fib_window,
-			 fi->fib_rtt >> 3);
-	else
-		snprintf(bf, sizeof(bf),
-			 "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
-			 prefix, 0, flags, 0, 0, 0, mask, 0, 0, 0);
-	seq_printf(seq, "%-127s\n", bf);
-}
-
-#endif
diff -Nru a/net/ipv4/ip_proc.c b/net/ipv4/ip_proc.c
--- a/net/ipv4/ip_proc.c	Sun Oct 20 03:06:50 2002
+++ b/net/ipv4/ip_proc.c	Sun Oct 20 03:06:50 2002
@@ -21,7 +21,6 @@
 #include <net/udp.h>
 #include <linux/rtnetlink.h>
 #include <linux/route.h>
-#include <net/ip_fib.h>
 #include <linux/seq_file.h>
 #include <linux/proc_fs.h>
 
@@ -250,38 +249,6 @@
 
 /* ------------------------------------------------------------------------ */
 
-static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
-{
-	return *pos ? NULL : (void *)1;
-}
-
-static void *fib_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
-	return NULL;
-}
-
-static void fib_seq_stop(struct seq_file *seq, void *v)
-{
-}
-/* 
- *	This outputs /proc/net/route.
- *
- *	It always works in backward compatibility mode.
- *	The format of the file is not supposed to be changed.
- */
-static int fib_seq_show(struct seq_file *seq, void *v)
-{
-	seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
-			"\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU"
-			"\tWindow\tIRTT");
-	if (ip_fib_main_table)
-		ip_fib_main_table->tb_seq_show(ip_fib_main_table, seq);
-
-	return 0;
-}
-
-/* ------------------------------------------------------------------------ */
-
 struct udp_iter_state {
 	int bucket;
 };
@@ -384,13 +351,6 @@
 	.show   = arp_seq_show,
 };
 
-static struct seq_operations fib_seq_ops = {
-	.start  = fib_seq_start,
-	.next   = fib_seq_next,
-	.stop   = fib_seq_stop,
-	.show   = fib_seq_show,
-};
-
 static struct seq_operations udp_seq_ops = {
 	.start  = udp_seq_start,
 	.next   = udp_seq_next,
@@ -421,7 +381,7 @@
 	goto out;
 }
 
-static int arp_seq_release(struct inode *inode, struct file *file)
+int ip_seq_release(struct inode *inode, struct file *file)
 {
 	struct seq_file *seq = (struct seq_file *)file->private_data;
 
@@ -431,11 +391,6 @@
 	return seq_release(inode, file);
 }
 
-static int fib_seq_open(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &fib_seq_ops);
-}
-
 static int udp_seq_open(struct inode *inode, struct file *file)
 {
 	struct seq_file *seq;
@@ -459,35 +414,18 @@
 	goto out;
 }
 
-static int udp_seq_release(struct inode *inode, struct file *file)
-{
-	struct seq_file *seq = (struct seq_file *)file->private_data;
-
-	kfree(seq->private);
-	seq->private = NULL;
-
-	return seq_release(inode, file);
-}
-
 static struct file_operations arp_seq_fops = {
 	.open           = arp_seq_open,
 	.read           = seq_read,
 	.llseek         = seq_lseek,
-	.release	= arp_seq_release,
-};
-
-static struct file_operations fib_seq_fops = {
-	.open           = fib_seq_open,
-	.read           = seq_read,
-	.llseek         = seq_lseek,
-	.release	= seq_release,
+	.release	= ip_seq_release,
 };
 
 static struct file_operations udp_seq_fops = {
 	.open           = udp_seq_open,
 	.read           = seq_read,
 	.llseek         = seq_lseek,
-	.release	= udp_seq_release,
+	.release	= ip_seq_release,
 };
 
 /* ------------------------------------------------------------------------ */
@@ -522,14 +460,8 @@
 		goto out_arp;
 	p->proc_fops = &arp_seq_fops;
 
-	p = create_proc_entry("route", S_IRUGO, proc_net);
-	if (!p)
-		goto out_route;
-	p->proc_fops = &fib_seq_fops;
 out:
 	return rc;
-out_route:
-	remove_proc_entry("route", proc_net);
 out_arp:
 	remove_proc_entry("udp", proc_net);
 out_udp:

===================================================================


This BitKeeper patch contains the following changesets:
1.809
## Wrapped with gzip_uu ##


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*_P=QF-=-*R@`````
`
end
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