fs/aufs/debug.h

   1 /*
   2  * Copyright (C) 2005-2011 Junjiro R. Okajima
   3  *
   4  * This program, aufs is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 /*
  20  * debug print functions
  21  */
  22
  23 #ifndef __AUFS_DEBUG_H__
  24 #define __AUFS_DEBUG_H__
  25
  26 #ifdef __KERNEL__
  27
  28 #include <asm/system.h>
  29 #include <linux/bug.h>
  30 /* #include <linux/err.h> */
  31 #include <linux/init.h>
  32 #include <linux/module.h>
  33 #include <linux/kallsyms.h>
  34 /* #include <linux/kernel.h> */
  35 #include <linux/delay.h>
  36 /* #include <linux/kd.h> */
  37 #include <linux/sysrq.h>
  38 #include <linux/aufs_type.h>
  39
  40 #ifdef CONFIG_AUFS_DEBUG
  41 #define AuDebugOn(a)            BUG_ON(a)
  42
  43 /* module parameter */
  44 extern int aufs_debug;
  45 static inline void au_debug(int n)
  46 {
  47         aufs_debug = n;
  48         smp_mb();
  49 }
  50
  51 static inline int au_debug_test(void)
  52 {
  53         return aufs_debug;
  54 }
  55 #else
  56 #define AuDebugOn(a)            do {} while (0)
  57 AuStubVoid(au_debug, int n)
  58 AuStubInt0(au_debug_test, void)
  59 #endif /* CONFIG_AUFS_DEBUG */
  60
  61 /* ---------------------------------------------------------------------- */
  62
  63 /* debug print */
  64
  65 #define AuDbg(fmt, ...) do { \
  66         if (au_debug_test()) \
  67                 pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \
  68 } while (0)
  69 #define AuLabel(l)              AuDbg(#l "\n")
  70 #define AuIOErr(fmt, ...)       pr_err("I/O Error, " fmt, ##__VA_ARGS__)
  71 #define AuWarn1(fmt, ...) do { \
  72         static unsigned char _c; \
  73         if (!_c++) \
  74                 pr_warning(fmt, ##__VA_ARGS__); \
  75 } while (0)
  76
  77 #define AuErr1(fmt, ...) do { \
  78         static unsigned char _c; \
  79         if (!_c++) \
  80                 pr_err(fmt, ##__VA_ARGS__); \
  81 } while (0)
  82
  83 #define AuIOErr1(fmt, ...) do { \
  84         static unsigned char _c; \
  85         if (!_c++) \
  86                 AuIOErr(fmt, ##__VA_ARGS__); \
  87 } while (0)
  88
  89 #define AuUnsupportMsg  "This operation is not supported." \
  90                         " Please report this application to aufs-users ML."
  91 #define AuUnsupport(fmt, ...) do { \
  92         pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \
  93         dump_stack(); \
  94 } while (0)
  95
  96 #define AuTraceErr(e) do { \
  97         if (unlikely((e) < 0)) \
  98                 AuDbg("err %d\n", (int)(e)); \
  99 } while (0)
 100
 101 #define AuTraceErrPtr(p) do { \
 102         if (IS_ERR(p)) \
 103                 AuDbg("err %ld\n", PTR_ERR(p)); \
 104 } while (0)
 105
 106 /* dirty macros for debug print, use with "%.*s" and caution */
 107 #define AuLNPair(qstr)          (qstr)->len, (qstr)->name
 108 #define AuDLNPair(d)            AuLNPair(&(d)->d_name)
 109
 110 /* ---------------------------------------------------------------------- */
 111
 112 struct au_sbinfo;
 113 struct au_finfo;
 114 struct dentry;
 115 #ifdef CONFIG_AUFS_DEBUG
 116 extern char *au_plevel;
 117 struct au_nhash;
 118 void au_dpri_whlist(struct au_nhash *whlist);
 119 struct au_vdir;
 120 void au_dpri_vdir(struct au_vdir *vdir);
 121 struct inode;
 122 void au_dpri_inode(struct inode *inode);
 123 void au_dpri_dalias(struct inode *inode);
 124 void au_dpri_dentry(struct dentry *dentry);
 125 struct file;
 126 void au_dpri_file(struct file *filp);
 127 struct super_block;
 128 void au_dpri_sb(struct super_block *sb);
 129
 130 void au_dbg_sleep_jiffy(int jiffy);
 131 struct iattr;
 132 void au_dbg_iattr(struct iattr *ia);
 133
 134 #define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__)
 135 void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line);
 136 void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen);
 137 void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen);
 138 void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen);
 139 void au_dbg_verify_kthread(void);
 140
 141 int __init au_debug_init(void);
 142 void au_debug_sbinfo_init(struct au_sbinfo *sbinfo);
 143 #define AuDbgWhlist(w) do { \
 144         AuDbg(#w "\n"); \
 145         au_dpri_whlist(w); \
 146 } while (0)
 147
 148 #define AuDbgVdir(v) do { \
 149         AuDbg(#v "\n"); \
 150         au_dpri_vdir(v); \
 151 } while (0)
 152
 153 #define AuDbgInode(i) do { \
 154         AuDbg(#i "\n"); \
 155         au_dpri_inode(i); \
 156 } while (0)
 157
 158 #define AuDbgDAlias(i) do { \
 159         AuDbg(#i "\n"); \
 160         au_dpri_dalias(i); \
 161 } while (0)
 162
 163 #define AuDbgDentry(d) do { \
 164         AuDbg(#d "\n"); \
 165         au_dpri_dentry(d); \
 166 } while (0)
 167
 168 #define AuDbgFile(f) do { \
 169         AuDbg(#f "\n"); \
 170         au_dpri_file(f); \
 171 } while (0)
 172
 173 #define AuDbgSb(sb) do { \
 174         AuDbg(#sb "\n"); \
 175         au_dpri_sb(sb); \
 176 } while (0)
 177
 178 #define AuDbgSleep(sec) do { \
 179         AuDbg("sleep %d sec\n", sec); \
 180         ssleep(sec); \
 181 } while (0)
 182
 183 #define AuDbgSleepJiffy(jiffy) do { \
 184         AuDbg("sleep %d jiffies\n", jiffy); \
 185         au_dbg_sleep_jiffy(jiffy); \
 186 } while (0)
 187
 188 #define AuDbgIAttr(ia) do { \
 189         AuDbg("ia_valid 0x%x\n", (ia)->ia_valid); \
 190         au_dbg_iattr(ia); \
 191 } while (0)
 192
 193 #define AuDbgSym(addr) do {                             \
 194         char sym[KSYM_SYMBOL_LEN];                      \
 195         sprint_symbol(sym, (unsigned long)addr);        \
 196         AuDbg("%s\n", sym);                             \
 197 } while (0)
 198
 199 #define AuInfoSym(addr) do {                            \
 200         char sym[KSYM_SYMBOL_LEN];                      \
 201         sprint_symbol(sym, (unsigned long)addr);        \
 202         AuInfo("%s\n", sym);                            \
 203 } while (0)
 204 #else
 205 AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry)
 206 AuStubVoid(au_dbg_verify_dir_parent, struct dentry *dentry, unsigned int sigen)
 207 AuStubVoid(au_dbg_verify_nondir_parent, struct dentry *dentry,
 208            unsigned int sigen)
 209 AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen)
 210 AuStubVoid(au_dbg_verify_kthread, void)
 211 AuStubInt0(__init au_debug_init, void)
 212 AuStubVoid(au_debug_sbinfo_init, struct au_sbinfo *sbinfo)
 213
 214 #define AuDbgWhlist(w)          do {} while (0)
 215 #define AuDbgVdir(v)            do {} while (0)
 216 #define AuDbgInode(i)           do {} while (0)
 217 #define AuDbgDAlias(i)          do {} while (0)
 218 #define AuDbgDentry(d)          do {} while (0)
 219 #define AuDbgFile(f)            do {} while (0)
 220 #define AuDbgSb(sb)             do {} while (0)
 221 #define AuDbgSleep(sec)         do {} while (0)
 222 #define AuDbgSleepJiffy(jiffy)  do {} while (0)
 223 #define AuDbgIAttr(ia)          do {} while (0)
 224 #define AuDbgSym(addr)          do {} while (0)
 225 #define AuInfoSym(addr)         do {} while (0)
 226 #endif /* CONFIG_AUFS_DEBUG */
 227
 228 /* ---------------------------------------------------------------------- */
 229
 230 #ifdef CONFIG_AUFS_MAGIC_SYSRQ
 231 int __init au_sysrq_init(void);
 232 void au_sysrq_fin(void);
 233
 234 #ifdef CONFIG_HW_CONSOLE
 235 #define au_dbg_blocked() do { \
 236         WARN_ON(1); \
 237         handle_sysrq('w'); \
 238 } while (0)
 239 #else
 240 AuStubVoid(au_dbg_blocked, void)
 241 #endif
 242
 243 #else
 244 AuStubInt0(__init au_sysrq_init, void)
 245 AuStubVoid(au_sysrq_fin, void)
 246 AuStubVoid(au_dbg_blocked, void)
 247 #endif /* CONFIG_AUFS_MAGIC_SYSRQ */
 248
 249 #endif /* __KERNEL__ */
 250 #endif /* __AUFS_DEBUG_H__ */