linux-imx

/*

 *

 * Copyright (C) 2011 Novell Inc.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 */

​

#include <uapi/linux/magic.h>

#include <linux/fs.h>

#include <linux/namei.h>

#include <linux/xattr.h>

#include <linux/mount.h>

#include <linux/parser.h>

#include <linux/module.h>

#include <linux/statfs.h>

#include <linux/seq_file.h>

#include <linux/posix_acl_xattr.h>

#include <linux/exportfs.h>

#include "overlayfs.h"

​

MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");

MODULE_DESCRIPTION("Overlay filesystem");

MODULE_LICENSE("GPL");

​

​

struct ovl_dir_cache;

​

#define OVL_MAX_STACK 500

​

static bool ovl_redirect_dir_def = IS_ENABLED(CONFIG_OVERLAY_FS_REDIRECT_DIR);

module_param_named(redirect_dir, ovl_redirect_dir_def, bool, 0644);

MODULE_PARM_DESC(ovl_redirect_dir_def,

         "Default to on or off for the redirect_dir feature");

​

static bool ovl_redirect_always_follow =

    IS_ENABLED(CONFIG_OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW);

module_param_named(redirect_always_follow, ovl_redirect_always_follow,

           bool, 0644);

MODULE_PARM_DESC(ovl_redirect_always_follow,

         "Follow redirects even if redirect_dir feature is turned off");

​

static bool ovl_index_def = IS_ENABLED(CONFIG_OVERLAY_FS_INDEX);

module_param_named(index, ovl_index_def, bool, 0644);

MODULE_PARM_DESC(ovl_index_def,

         "Default to on or off for the inodes index feature");

​

static bool ovl_nfs_export_def = IS_ENABLED(CONFIG_OVERLAY_FS_NFS_EXPORT);

module_param_named(nfs_export, ovl_nfs_export_def, bool, 0644);

MODULE_PARM_DESC(ovl_nfs_export_def,

         "Default to on or off for the NFS export feature");

​

static bool ovl_xino_auto_def = IS_ENABLED(CONFIG_OVERLAY_FS_XINO_AUTO);

module_param_named(xino_auto, ovl_xino_auto_def, bool, 0644);

MODULE_PARM_DESC(ovl_xino_auto_def,

         "Auto enable xino feature");

​

static void ovl_entry_stack_free(struct ovl_entry *oe)

{

    unsigned int i;

​

    for (i = 0; i < oe->numlower; i++)