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_ */ 47