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
  11 struct file_operations;
  12
  13 /* declared over in file.c */
  14 extern const struct file_operations debugfs_noop_file_operations;
  15 extern const struct file_operations debugfs_open_proxy_file_operations;
  16 extern const struct file_operations debugfs_full_proxy_file_operations;
  17
  18 struct 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_ */