From e22f628395432b967f2f505858c64450f7835365 Mon Sep 17 00:00:00 2001
From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Sun, 6 Sep 2009 23:31:25 +0000
Subject: [PATCH] Convert /proc/device-tree/ to seq_file

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 fs/proc/proc_devtree.c | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c
index 7ba79a54948..123257bb356 100644
--- a/fs/proc/proc_devtree.c
+++ b/fs/proc/proc_devtree.c
@@ -7,6 +7,7 @@
 #include <linux/init.h>
 #include <linux/time.h>
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/stat.h>
 #include <linux/string.h>
 #include <asm/prom.h>
@@ -25,26 +26,27 @@ static struct proc_dir_entry *proc_device_tree;
 /*
  * Supply data on a read from /proc/device-tree/node/property.
  */
-static int property_read_proc(char *page, char **start, off_t off,
-			      int count, int *eof, void *data)
+static int property_proc_show(struct seq_file *m, void *v)
 {
-	struct property *pp = data;
-	int n;
+	struct property *pp = m->private;
 
-	if (off >= pp->length) {
-		*eof = 1;
-		return 0;
-	}
-	n = pp->length - off;
-	if (n > count)
-		n = count;
-	else
-		*eof = 1;
-	memcpy(page, (char *)pp->value + off, n);
-	*start = page;
-	return n;
+	seq_write(m, pp->value, pp->length);
+	return 0;
 }
 
+static int property_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, property_proc_show, PDE(inode)->data);
+}
+
+static const struct file_operations property_proc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= property_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
 /*
  * For a node with a name like "gc@10", we make symlinks called "gc"
  * and "@10" to it.
@@ -63,10 +65,9 @@ __proc_device_tree_add_prop(struct proc_dir_entry *de, struct property *pp,
 	 * Unfortunately proc_register puts each new entry
 	 * at the beginning of the list.  So we rearrange them.
 	 */
-	ent = create_proc_read_entry(name,
-				     strncmp(name, "security-", 9)
-				     ? S_IRUGO : S_IRUSR, de,
-				     property_read_proc, pp);
+	ent = proc_create_data(name,
+			       strncmp(name, "security-", 9) ? S_IRUGO : S_IRUSR,
+			       de, &property_proc_fops, pp);
 	if (ent == NULL)
 		return NULL;