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products/sources/formale Sprachen/C/Linux/include/linux/ (Open Source Betriebssystem Version 6.17.9^©) Datei vom 24.10.2025 mit Größe 3 kB

Quelle tracefs.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
*  tracefs.h - a pseudo file system for activating tracing
*
* Based on debugfs by: 2004 Greg Kroah-Hartman <greg@kroah.com>
*
*  Copyright (C) 2014 Red Hat Inc, author: Steven Rostedt <srostedt@redhat.com>
*
* tracefs is the file system that is used by the tracing infrastructure.
*/

#ifndef _TRACEFS_H_
#define _TRACEFS_H_

#include <linux/fs.h>
#include <linux/seq_file.h>

#include <linux/types.h>

struct file_operations;

#ifdef CONFIG_TRACING

struct eventfs_file;

/**
* eventfs_callback - A callback function to create dynamic files in eventfs
* @name: The name of the file that is to be created
* @mode: return the file mode for the file (RW access, etc)
* @data: data to pass to the created file ops
* @fops: the file operations of the created file
*
* The evetnfs files are dynamically created. The struct eventfs_entry array
* is passed to eventfs_create_dir() or eventfs_create_events_dir() that will
* be used to create the files within those directories. When a lookup
* or access to a file within the directory is made, the struct eventfs_entry
* array is used to find a callback() with the matching name that is being
* referenced (for lookups, the entire array is iterated and each callback
* will be called).
*
* The callback will be called with @name for the name of the file to create.
* The callback can return less than 1 to indicate  that no file should be
* created.
*
* If a file is to be created, then @mode should be populated with the file
* mode (permissions) for which the file is created for. This would be
* used to set the created inode i_mode field.
*
* The @data should be set to the data passed to the other file operations
* (read, write, etc). Note, @data will also point to the data passed in
* to eventfs_create_dir() or eventfs_create_events_dir(), but the callback
* can replace the data if it chooses to. Otherwise, the original data
* will be used for the file operation functions.
*
* The @fops should be set to the file operations that will be used to create
* the inode.
*
* NB. This callback is called while holding internal locks of the eventfs
*     system. The callback must not call any code that might also call into
*     the tracefs or eventfs system or it will risk creating a deadlock.
*/
typedef int (*eventfs_callback)(const char *name, umode_t *mode, void **data,
    const struct file_operations **fops);

typedef void (*eventfs_release)(const char *name, void *data);

/**
* struct eventfs_entry - dynamically created eventfs file call back handler
* @name: Then name of the dynamic file in an eventfs directory
* @callback: The callback to get the fops of the file when it is created
*
* See evenfs_callback() typedef for how to set up @callback.
*/
struct eventfs_entry {
const char   *name;
eventfs_callback  callback;
eventfs_release   release;
};

struct eventfs_inode;

struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry *parent,
      const struct eventfs_entry *entries,
      int size, void *data);

struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode *parent,
      const struct eventfs_entry *entries,
      int size, void *data);

void eventfs_remove_events_dir(struct eventfs_inode *ei);
void eventfs_remove_dir(struct eventfs_inode *ei);

struct dentry *tracefs_create_file(const char *name, umode_t mode,
       struct dentry *parent, void *data,
       const struct file_operations *fops);

struct dentry *tracefs_create_dir(const char *name, struct dentry *parent);

void tracefs_remove(struct dentry *dentry);

struct dentry *tracefs_create_instance_dir(const char *name, struct dentry *parent,
        int (*mkdir)(const char *name),
        int (*rmdir)(const char *name));

bool tracefs_initialized(void);

#endif /* CONFIG_TRACING */

#endif

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