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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
12struct file_operations;
13
14/* declared over in file.c */
15extern const struct file_operations debugfs_noop_file_operations;
16extern const struct file_operations debugfs_open_proxy_file_operations;
17extern const struct file_operations debugfs_full_proxy_file_operations;
18
19struct debugfs_fsdata {
20 const struct file_operations *real_fops;
21 const struct debugfs_short_fops *short_fops;
22 union {
23 /* automount_fn is used when real_fops is NULL */
24 debugfs_automount_t automount;
25 struct {
26 refcount_t active_users;
27 struct completion active_users_drained;
28
29 /* protect cancellations */
30 struct mutex cancellations_mtx;
31 struct list_head cancellations;
32 };
33 };
34};
35
36/*
37 * A dentry's ->d_fsdata either points to the real fops or to a
38 * dynamically allocated debugfs_fsdata instance.
39 * In order to distinguish between these two cases, a real fops
40 * pointer gets its lowest bit set.
41 */
42#define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0)
43/*
44 * A dentry's ->d_fsdata, when pointing to real fops, is with
45 * short fops instead of full fops.
46 */
47#define DEBUGFS_FSDATA_IS_SHORT_FOPS_BIT BIT(1)
48
49/* Access BITS */
50#define DEBUGFS_ALLOW_API BIT(0)
51#define DEBUGFS_ALLOW_MOUNT BIT(1)
52
53#ifdef CONFIG_DEBUG_FS_ALLOW_ALL
54#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API)
55#endif
56#ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT
57#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API)
58#endif
59#ifdef CONFIG_DEBUG_FS_ALLOW_NONE
60#define DEFAULT_DEBUGFS_ALLOW_BITS (0)
61#endif
62
63#endif /* _DEBUGFS_INTERNAL_H_ */