linux/include/linux/debugfs.h
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   1/*
   2 *  debugfs.h - a tiny little debug file system
   3 *
   4 *  Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
   5 *  Copyright (C) 2004 IBM Inc.
   6 *
   7 *      This program is free software; you can redistribute it and/or
   8 *      modify it under the terms of the GNU General Public License version
   9 *      2 as published by the Free Software Foundation.
  10 *
  11 *  debugfs is for people to use instead of /proc or /sys.
  12 *  See Documentation/DocBook/filesystems for more details.
  13 */
  14
  15#ifndef _DEBUGFS_H_
  16#define _DEBUGFS_H_
  17
  18#include <linux/fs.h>
  19
  20#include <linux/types.h>
  21
  22struct file_operations;
  23
  24struct debugfs_blob_wrapper {
  25        void *data;
  26        unsigned long size;
  27};
  28
  29extern struct dentry *arch_debugfs_dir;
  30
  31#if defined(CONFIG_DEBUG_FS)
  32
  33/* declared over in file.c */
  34extern const struct file_operations debugfs_file_operations;
  35extern const struct inode_operations debugfs_link_operations;
  36
  37struct dentry *debugfs_create_file(const char *name, mode_t mode,
  38                                   struct dentry *parent, void *data,
  39                                   const struct file_operations *fops);
  40
  41struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
  42
  43struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
  44                                      const char *dest);
  45
  46void debugfs_remove(struct dentry *dentry);
  47void debugfs_remove_recursive(struct dentry *dentry);
  48
  49struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
  50                struct dentry *new_dir, const char *new_name);
  51
  52struct dentry *debugfs_create_u8(const char *name, mode_t mode,
  53                                 struct dentry *parent, u8 *value);
  54struct dentry *debugfs_create_u16(const char *name, mode_t mode,
  55                                  struct dentry *parent, u16 *value);
  56struct dentry *debugfs_create_u32(const char *name, mode_t mode,
  57                                  struct dentry *parent, u32 *value);
  58struct dentry *debugfs_create_u64(const char *name, mode_t mode,
  59                                  struct dentry *parent, u64 *value);
  60struct dentry *debugfs_create_x8(const char *name, mode_t mode,
  61                                 struct dentry *parent, u8 *value);
  62struct dentry *debugfs_create_x16(const char *name, mode_t mode,
  63                                  struct dentry *parent, u16 *value);
  64struct dentry *debugfs_create_x32(const char *name, mode_t mode,
  65                                  struct dentry *parent, u32 *value);
  66struct dentry *debugfs_create_x64(const char *name, mode_t mode,
  67                                  struct dentry *parent, u64 *value);
  68struct dentry *debugfs_create_size_t(const char *name, mode_t mode,
  69                                     struct dentry *parent, size_t *value);
  70struct dentry *debugfs_create_bool(const char *name, mode_t mode,
  71                                  struct dentry *parent, u32 *value);
  72
  73struct dentry *debugfs_create_blob(const char *name, mode_t mode,
  74                                  struct dentry *parent,
  75                                  struct debugfs_blob_wrapper *blob);
  76
  77bool debugfs_initialized(void);
  78
  79#else
  80
  81#include <linux/err.h>
  82
  83/* 
  84 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
  85 * so users have a chance to detect if there was a real error or not.  We don't
  86 * want to duplicate the design decision mistakes of procfs and devfs again.
  87 */
  88
  89static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
  90                                        struct dentry *parent, void *data,
  91                                        const struct file_operations *fops)
  92{
  93        return ERR_PTR(-ENODEV);
  94}
  95
  96static inline struct dentry *debugfs_create_dir(const char *name,
  97                                                struct dentry *parent)
  98{
  99        return ERR_PTR(-ENODEV);
 100}
 101
 102static inline struct dentry *debugfs_create_symlink(const char *name,
 103                                                    struct dentry *parent,
 104                                                    const char *dest)
 105{
 106        return ERR_PTR(-ENODEV);
 107}
 108
 109static inline void debugfs_remove(struct dentry *dentry)
 110{ }
 111
 112static inline void debugfs_remove_recursive(struct dentry *dentry)
 113{ }
 114
 115static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 116                struct dentry *new_dir, char *new_name)
 117{
 118        return ERR_PTR(-ENODEV);
 119}
 120
 121static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
 122                                               struct dentry *parent,
 123                                               u8 *value)
 124{
 125        return ERR_PTR(-ENODEV);
 126}
 127
 128static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
 129                                                struct dentry *parent,
 130                                                u16 *value)
 131{
 132        return ERR_PTR(-ENODEV);
 133}
 134
 135static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
 136                                                struct dentry *parent,
 137                                                u32 *value)
 138{
 139        return ERR_PTR(-ENODEV);
 140}
 141
 142static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode,
 143                                                struct dentry *parent,
 144                                                u64 *value)
 145{
 146        return ERR_PTR(-ENODEV);
 147}
 148
 149static inline struct dentry *debugfs_create_x8(const char *name, mode_t mode,
 150                                               struct dentry *parent,
 151                                               u8 *value)
 152{
 153        return ERR_PTR(-ENODEV);
 154}
 155
 156static inline struct dentry *debugfs_create_x16(const char *name, mode_t mode,
 157                                                struct dentry *parent,
 158                                                u16 *value)
 159{
 160        return ERR_PTR(-ENODEV);
 161}
 162
 163static inline struct dentry *debugfs_create_x32(const char *name, mode_t mode,
 164                                                struct dentry *parent,
 165                                                u32 *value)
 166{
 167        return ERR_PTR(-ENODEV);
 168}
 169
 170static inline struct dentry *debugfs_create_size_t(const char *name, mode_t mode,
 171                                     struct dentry *parent,
 172                                     size_t *value)
 173{
 174        return ERR_PTR(-ENODEV);
 175}
 176
 177static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
 178                                                 struct dentry *parent,
 179                                                 u32 *value)
 180{
 181        return ERR_PTR(-ENODEV);
 182}
 183
 184static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
 185                                  struct dentry *parent,
 186                                  struct debugfs_blob_wrapper *blob)
 187{
 188        return ERR_PTR(-ENODEV);
 189}
 190
 191static inline bool debugfs_initialized(void)
 192{
 193        return false;
 194}
 195
 196#endif
 197
 198#endif
 199
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