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/* 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_
#include <linux/list.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;
const struct debugfs_short_fops *short_fops;
union {
/* automount_fn is used when real_fops is NULL */
debugfs_automount_t automount;
struct {
refcount_t active_users;
struct completion active_users_drained;
/* protect cancellations */
struct mutex cancellations_mtx;
struct list_head cancellations;
};
};
};
/*
* 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)
/*
* A dentry's ->d_fsdata, when pointing to real fops, is with
* short fops instead of full fops.
*/
#define DEBUGFS_FSDATA_IS_SHORT_FOPS_BIT BIT(1)
/* Access BITS */
#define DEBUGFS_ALLOW_API BIT(0)
#define DEBUGFS_ALLOW_MOUNT BIT(1)
#ifdef CONFIG_DEBUG_FS_ALLOW_ALL
#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API)
#endif
#ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT
#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API)
#endif
#ifdef CONFIG_DEBUG_FS_ALLOW_NONE
#define DEFAULT_DEBUGFS_ALLOW_BITS (0)
#endif
#endif /* _DEBUGFS_INTERNAL_H_ */
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