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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110/* 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 eventfs 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