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 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