1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * tracefs.h - a pseudo file system for activating tracing 4 * 5 * Based on debugfs by: 2004 Greg Kroah-Hartman <[email protected]> 6 * 7 * Copyright (C) 2014 Red Hat Inc, author: Steven Rostedt <[email protected]> 8 * 9 * tracefs is the file system that is used by the tracing infrastructure. 10 */ 11 12 #ifndef _TRACEFS_H_ 13 #define _TRACEFS_H_ 14 15 #include <linux/fs.h> 16 #include <linux/seq_file.h> 17 18 #include <linux/types.h> 19 20 struct file_operations; 21 22 #ifdef CONFIG_TRACING 23 24 struct eventfs_file; 25 26 typedef int (*eventfs_callback)(const char *name, umode_t *mode, void **data, 27 const struct file_operations **fops); 28 29 struct eventfs_entry { 30 const char *name; 31 eventfs_callback callback; 32 }; 33 34 struct eventfs_inode; 35 36 struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry *parent, 37 const struct eventfs_entry *entries, 38 int size, void *data); 39 40 struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode *parent, 41 const struct eventfs_entry *entries, 42 int size, void *data); 43 44 void eventfs_remove_dir(struct eventfs_inode *ei); 45 46 struct dentry *tracefs_create_file(const char *name, umode_t mode, 47 struct dentry *parent, void *data, 48 const struct file_operations *fops); 49 50 struct dentry *tracefs_create_dir(const char *name, struct dentry *parent); 51 52 void tracefs_remove(struct dentry *dentry); 53 54 struct dentry *tracefs_create_instance_dir(const char *name, struct dentry *parent, 55 int (*mkdir)(const char *name), 56 int (*rmdir)(const char *name)); 57 58 bool tracefs_initialized(void); 59 60 #endif /* CONFIG_TRACING */ 61 62 #endif 63