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_
10 #include <linux/list.h>
12 struct file_operations;
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;
19 struct debugfs_fsdata {
20 const struct file_operations *real_fops;
22 /* automount_fn is used when real_fops is NULL */
23 debugfs_automount_t automount;
25 refcount_t active_users;
26 struct completion active_users_drained;
28 /* protect cancellations */
29 struct mutex cancellations_mtx;
30 struct list_head cancellations;
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.
41 #define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0)
44 #define DEBUGFS_ALLOW_API BIT(0)
45 #define DEBUGFS_ALLOW_MOUNT BIT(1)
47 #ifdef CONFIG_DEBUG_FS_ALLOW_ALL
48 #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API)
50 #ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT
51 #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API)
53 #ifdef CONFIG_DEBUG_FS_ALLOW_NONE
54 #define DEFAULT_DEBUGFS_ALLOW_BITS (0)
57 #endif /* _DEBUGFS_INTERNAL_H_ */