1 /* SPDX-License-Identifier: GPL-2.0 */
3 * internal.h - declarations internal to debugfs
5 * Copyright (C) 2016 Nicolai Stange <nicstange@gmail.com>
8 #ifndef _DEBUGFS_INTERNAL_H_
9 #define _DEBUGFS_INTERNAL_H_
11 struct file_operations;
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;
18 struct debugfs_fsdata {
19 const struct file_operations *real_fops;
21 /* automount_fn is used when real_fops is NULL */
22 debugfs_automount_t automount;
24 refcount_t active_users;
25 struct completion active_users_drained;
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.
36 #define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0)
39 #define DEBUGFS_ALLOW_API BIT(0)
40 #define DEBUGFS_ALLOW_MOUNT BIT(1)
42 #ifdef CONFIG_DEBUG_FS_ALLOW_ALL
43 #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API)
45 #ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT
46 #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API)
48 #ifdef CONFIG_DEBUG_FS_ALLOW_NONE
49 #define DEFAULT_DEBUGFS_ALLOW_BITS (0)
52 #endif /* _DEBUGFS_INTERNAL_H_ */