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 #include <linux/list.h> 11 12 struct file_operations; 13 14 /* declared over in file.c */ 15 extern const struct file_operations debugfs_noop_file_operations; 16 extern const struct file_operations debugfs_open_proxy_file_operations; 17 extern const struct file_operations debugfs_full_proxy_file_operations; 18 19 struct debugfs_fsdata { 20 const struct file_operations *real_fops; 21 union { 22 /* automount_fn is used when real_fops is NULL */ 23 debugfs_automount_t automount; 24 struct { 25 refcount_t active_users; 26 struct completion active_users_drained; 27 28 /* protect cancellations */ 29 struct mutex cancellations_mtx; 30 struct list_head cancellations; 31 }; 32 }; 33 }; 34 35 /* 36 * A dentry's ->d_fsdata either points to the real fops or to a 37 * dynamically allocated debugfs_fsdata instance. 38 * In order to distinguish between these two cases, a real fops 39 * pointer gets its lowest bit set. 40 */ 41 #define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0) 42 43 /* Access BITS */ 44 #define DEBUGFS_ALLOW_API BIT(0) 45 #define DEBUGFS_ALLOW_MOUNT BIT(1) 46 47 #ifdef CONFIG_DEBUG_FS_ALLOW_ALL 48 #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API) 49 #endif 50 #ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT 51 #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API) 52 #endif 53 #ifdef CONFIG_DEBUG_FS_ALLOW_NONE 54 #define DEFAULT_DEBUGFS_ALLOW_BITS (0) 55 #endif 56 57 #endif /* _DEBUGFS_INTERNAL_H_ */ 58