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 union { 21 /* automount_fn is used when real_fops is NULL */ 22 debugfs_automount_t automount; 23 struct { 24 refcount_t active_users; 25 struct completion active_users_drained; 26 }; 27 }; 28}; 29 30/* 31 * A dentry's ->d_fsdata either points to the real fops or to a 32 * dynamically allocated debugfs_fsdata instance. 33 * In order to distinguish between these two cases, a real fops 34 * pointer gets its lowest bit set. 35 */ 36#define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0) 37 38/* Access BITS */ 39#define DEBUGFS_ALLOW_API BIT(0) 40#define DEBUGFS_ALLOW_MOUNT BIT(1) 41 42#ifdef CONFIG_DEBUG_FS_ALLOW_ALL 43#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API) 44#endif 45#ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT 46#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API) 47#endif 48#ifdef CONFIG_DEBUG_FS_ALLOW_NONE 49#define DEFAULT_DEBUGFS_ALLOW_BITS (0) 50#endif 51 52#endif /* _DEBUGFS_INTERNAL_H_ */ 53