LXR linux/fs/debugfs/internal.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *  internal.h - declarations internal to debugfs
   4 *
   5 *  Copyright (C) 2016 Nicolai Stange <nicstange@gmail.com>
   6 */
   7
   8#ifndef _DEBUGFS_INTERNAL_H_
   9#define _DEBUGFS_INTERNAL_H_
  10
  11struct file_operations;
  12
  13/* declared over in file.c */
  14extern const struct file_operations debugfs_noop_file_operations;
  15extern const struct file_operations debugfs_open_proxy_file_operations;
  16extern const struct file_operations debugfs_full_proxy_file_operations;
  17
  18struct debugfs_fsdata {
  19        const struct file_operations *real_fops;
  20        refcount_t active_users;
  21        struct completion active_users_drained;
  22};
  23
  24/*
  25 * A dentry's ->d_fsdata either points to the real fops or to a
  26 * dynamically allocated debugfs_fsdata instance.
  27 * In order to distinguish between these two cases, a real fops
  28 * pointer gets its lowest bit set.
  29 */
  30#define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0)
  31
  32/* Access BITS */
  33#define DEBUGFS_ALLOW_API       BIT(0)
  34#define DEBUGFS_ALLOW_MOUNT     BIT(1)
  35
  36#ifdef CONFIG_DEBUG_FS_ALLOW_ALL
  37#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API)
  38#endif
  39#ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT
  40#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API)
  41#endif
  42#ifdef CONFIG_DEBUG_FS_ALLOW_NONE
  43#define DEFAULT_DEBUGFS_ALLOW_BITS (0)
  44#endif
  45
  46#endif /* _DEBUGFS_INTERNAL_H_ */
  47