1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * internal.h - declarations internal to debugfs 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 2016 Nicolai Stange <nicstange@gmail.com> 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #ifndef _DEBUGFS_INTERNAL_H_ 9*4882a593Smuzhiyun #define _DEBUGFS_INTERNAL_H_ 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun struct file_operations; 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun /* declared over in file.c */ 14*4882a593Smuzhiyun extern const struct file_operations debugfs_noop_file_operations; 15*4882a593Smuzhiyun extern const struct file_operations debugfs_open_proxy_file_operations; 16*4882a593Smuzhiyun extern const struct file_operations debugfs_full_proxy_file_operations; 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun struct debugfs_fsdata { 19*4882a593Smuzhiyun const struct file_operations *real_fops; 20*4882a593Smuzhiyun refcount_t active_users; 21*4882a593Smuzhiyun struct completion active_users_drained; 22*4882a593Smuzhiyun }; 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun /* 25*4882a593Smuzhiyun * A dentry's ->d_fsdata either points to the real fops or to a 26*4882a593Smuzhiyun * dynamically allocated debugfs_fsdata instance. 27*4882a593Smuzhiyun * In order to distinguish between these two cases, a real fops 28*4882a593Smuzhiyun * pointer gets its lowest bit set. 29*4882a593Smuzhiyun */ 30*4882a593Smuzhiyun #define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0) 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun /* Access BITS */ 33*4882a593Smuzhiyun #define DEBUGFS_ALLOW_API BIT(0) 34*4882a593Smuzhiyun #define DEBUGFS_ALLOW_MOUNT BIT(1) 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #ifdef CONFIG_DEBUG_FS_ALLOW_ALL 37*4882a593Smuzhiyun #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API) 38*4882a593Smuzhiyun #endif 39*4882a593Smuzhiyun #ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT 40*4882a593Smuzhiyun #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API) 41*4882a593Smuzhiyun #endif 42*4882a593Smuzhiyun #ifdef CONFIG_DEBUG_FS_ALLOW_NONE 43*4882a593Smuzhiyun #define DEFAULT_DEBUGFS_ALLOW_BITS (0) 44*4882a593Smuzhiyun #endif 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun #endif /* _DEBUGFS_INTERNAL_H_ */ 47