summaryrefslogtreecommitdiff
path: root/fs/debugfs/internal.h
blob: 034e6973cead30a79918091f7e985453b4b06ae8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  internal.h - declarations internal to debugfs
 *
 *  Copyright (C) 2016 Nicolai Stange <nicstange@gmail.com>
 */

#ifndef _DEBUGFS_INTERNAL_H_
#define _DEBUGFS_INTERNAL_H_

struct file_operations;

/* declared over in file.c */
extern const struct file_operations debugfs_noop_file_operations;
extern const struct file_operations debugfs_open_proxy_file_operations;
extern const struct file_operations debugfs_full_proxy_file_operations;

struct debugfs_fsdata {
	const struct file_operations *real_fops;
	refcount_t active_users;
	struct completion active_users_drained;
};

/*
 * A dentry's ->d_fsdata either points to the real fops or to a
 * dynamically allocated debugfs_fsdata instance.
 * In order to distinguish between these two cases, a real fops
 * pointer gets its lowest bit set.
 */
#define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0)

#endif /* _DEBUGFS_INTERNAL_H_ */