debugfs: switch to simple_follow_link()

Reviewed-by: Jan Kara <[e-mail]>
Signed-off-by: Al Viro <[e-mail]>

fs/debugfs/file.c

···
 #include <linux/fs.h>
 #include <linux/seq_file.h>
 #include <linux/pagemap.h>
-#include <linux/namei.h>
 #include <linux/debugfs.h>
 #include <linux/io.h>
 #include <linux/slab.h>
···
 	.write =	default_write_file,
 	.open =		simple_open,
 	.llseek =	noop_llseek,
-};
-
-static void *debugfs_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
-	nd_set_link(nd, d_inode(dentry)->i_private);
-	return NULL;
-}
-
-const struct inode_operations debugfs_link_operations = {
-	.readlink       = generic_readlink,
-	.follow_link    = debugfs_follow_link,
 };
 
 static int debugfs_u8_set(void *data, u64 val)

fs/debugfs/inode.c

···
 	truncate_inode_pages_final(&inode->i_data);
 	clear_inode(inode);
 	if (S_ISLNK(inode->i_mode))
-		kfree(inode->i_private);
+		kfree(inode->i_link);
 }
 
 static const struct super_operations debugfs_super_operations = {
···
 		return failed_creating(dentry);
 	}
 	inode->i_mode = S_IFLNK | S_IRWXUGO;
-	inode->i_op = &debugfs_link_operations;
-	inode->i_private = link;
+	inode->i_op = &simple_symlink_inode_operations;
+	inode->i_link = link;
 	d_instantiate(dentry, inode);
 	return end_creating(dentry);
 }

include/linux/debugfs.h

···
 
 /* declared over in file.c */
 extern const struct file_operations debugfs_file_operations;
-extern const struct inode_operations debugfs_link_operations;
 
 struct dentry *debugfs_create_file(const char *name, umode_t mode,
 				   struct dentry *parent, void *data,