/*
   * JFFS2 -- Journalling Flash File System, Version 2.
   *

   * Copyright © 2001-2007 Red Hat, Inc.

   *
   * Created by David Woodhouse <dwmw2@infradead.org>
   *
   * For licensing information, see the file 'LICENCE' in this directory.
   *

   */

  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/fs.h>
  #include <linux/namei.h>
  #include "nodelist.h"

  static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd);

  const struct inode_operations jffs2_symlink_inode_operations =

  {

  	.readlink =	generic_readlink,
  	.follow_link =	jffs2_follow_link,

  	.permission =	jffs2_permission,
  	.setattr =	jffs2_setattr,
  	.setxattr =	jffs2_setxattr,
  	.getxattr =	jffs2_getxattr,
  	.listxattr =	jffs2_listxattr,
  	.removexattr =	jffs2_removexattr

  };

  static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd)

  {

  	struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);

  	char *p = (char *)f->target;

  	/*
  	 * We don't acquire the f->sem mutex here since the only data we

  	 * use is f->target.

  	 *

  	 * 1. If we are here the inode has already built and f->target has

  	 * to point to the target path.

  	 * 2. Nobody uses f->target (if the inode is symlink's inode). The
  	 * exception is inode freeing function which frees f->target. But

  	 * it can't be called while we are here and before VFS has

  	 * stopped using our f->target string which we provide by means of

  	 * nd_set_link() call.
  	 */

  	if (!p) {

  		printk(KERN_ERR "jffs2_follow_link(): can't find symlink target
  ");

  		p = ERR_PTR(-EIO);

  	}

  	D1(printk(KERN_DEBUG "jffs2_follow_link(): target path is '%s'
  ", (char *) f->target));

  	nd_set_link(nd, p);

  	/*

  	 * We will unlock the f->sem mutex but VFS will use the f->target string. This is safe
  	 * since the only way that may cause f->target to be changed is iput() operation.
  	 * But VFS will not use f->target after iput() has been called.

  	 */

  	return NULL;

  }