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 extern const struct file_operations debugfs_full_short_proxy_file_operations; 19 20 struct debugfs_fsdata { 21 const struct file_operations *real_fops; 22 const struct debugfs_short_fops *short_fops; 23 union { 24 /* automount_fn is used when real_fops is NULL */ 25 debugfs_automount_t automount; 26 struct { 27 refcount_t active_users; 28 struct completion active_users_drained; 29 30 /* protect cancellations */ 31 struct mutex cancellations_mtx; 32 struct list_head cancellations; 33 }; 34 }; 35 }; 36 37 /* 38 * A dentry's ->d_fsdata either points to the real fops or to a 39 * dynamically allocated debugfs_fsdata instance. 40 * In order to distinguish between these two cases, a real fops 41 * pointer gets its lowest bit set. 42 */ 43 #define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0) 44 45 /* Access BITS */ 46 #define DEBUGFS_ALLOW_API BIT(0) 47 #define DEBUGFS_ALLOW_MOUNT BIT(1) 48 49 #ifdef CONFIG_DEBUG_FS_ALLOW_ALL 50 #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API) 51 #endif 52 #ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT 53 #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API) 54 #endif 55 #ifdef CONFIG_DEBUG_FS_ALLOW_NONE 56 #define DEFAULT_DEBUGFS_ALLOW_BITS (0) 57 #endif 58 59 #endif /* _DEBUGFS_INTERNAL_H_ */ 60