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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * internal.h - declarations internal to debugfs4 *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 union {22 /* automount_fn is used when real_fops is NULL */23 debugfs_automount_t automount;24 struct {25 refcount_t active_users;26 struct completion active_users_drained;27 28 /* protect cancellations */29 struct mutex cancellations_mtx;30 struct list_head cancellations;31 };32 };33};34 35/*36 * A dentry's ->d_fsdata either points to the real fops or to a37 * dynamically allocated debugfs_fsdata instance.38 * In order to distinguish between these two cases, a real fops39 * pointer gets its lowest bit set.40 */41#define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0)42 43/* Access BITS */44#define DEBUGFS_ALLOW_API BIT(0)45#define DEBUGFS_ALLOW_MOUNT BIT(1)46 47#ifdef CONFIG_DEBUG_FS_ALLOW_ALL48#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API)49#endif50#ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT51#define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API)52#endif53#ifdef CONFIG_DEBUG_FS_ALLOW_NONE54#define DEFAULT_DEBUGFS_ALLOW_BITS (0)55#endif56 57#endif /* _DEBUGFS_INTERNAL_H_ */58