fs/ntfs/debug.c

   1 /*
   2  * debug.c - NTFS kernel debug support. Part of the Linux-NTFS project.
   3  *
   4  * Copyright (c) 2001-2004 Anton Altaparmakov
   5  *
   6  * This program/include file is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as published
   8  * by the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program/include file is distributed in the hope that it will be
  12  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program (in the main directory of the Linux-NTFS
  18  * distribution in the file COPYING); if not, write to the Free Software
  19  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22 #include "debug.h"
  23
  24 /**
  25  * __ntfs_warning - output a warning to the syslog
  26  * @function:   name of function outputting the warning
  27  * @sb:         super block of mounted ntfs filesystem
  28  * @fmt:        warning string containing format specifications
  29  * @...:        a variable number of arguments specified in @fmt
  30  *
  31  * Outputs a warning to the syslog for the mounted ntfs filesystem described
  32  * by @sb.
  33  *
  34  * @fmt and the corresponding @... is printf style format string containing
  35  * the warning string and the corresponding format arguments, respectively.
  36  *
  37  * @function is the name of the function from which __ntfs_warning is being
  38  * called.
  39  *
  40  * Note, you should be using debug.h::ntfs_warning(@sb, @fmt, @...) instead
  41  * as this provides the @function parameter automatically.
  42  */
  43 void __ntfs_warning(const char *function, const struct super_block *sb,
  44                 const char *fmt, ...)
  45 {
  46         struct va_format vaf;
  47         va_list args;
  48         int flen = 0;
  49
  50 #ifndef DEBUG
  51         if (!printk_ratelimit())
  52                 return;
  53 #endif
  54         if (function)
  55                 flen = strlen(function);
  56         va_start(args, fmt);
  57         vaf.fmt = fmt;
  58         vaf.va = &args;
  59         if (sb)
  60                 pr_warn("(device %s): %s(): %pV\n",
  61                         sb->s_id, flen ? function : "", &vaf);
  62         else
  63                 pr_warn("%s(): %pV\n", flen ? function : "", &vaf);
  64         va_end(args);
  65 }
  66
  67 /**
  68  * __ntfs_error - output an error to the syslog
  69  * @function:   name of function outputting the error
  70  * @sb:         super block of mounted ntfs filesystem
  71  * @fmt:        error string containing format specifications
  72  * @...:        a variable number of arguments specified in @fmt
  73  *
  74  * Outputs an error to the syslog for the mounted ntfs filesystem described
  75  * by @sb.
  76  *
  77  * @fmt and the corresponding @... is printf style format string containing
  78  * the error string and the corresponding format arguments, respectively.
  79  *
  80  * @function is the name of the function from which __ntfs_error is being
  81  * called.
  82  *
  83  * Note, you should be using debug.h::ntfs_error(@sb, @fmt, @...) instead
  84  * as this provides the @function parameter automatically.
  85  */
  86 void __ntfs_error(const char *function, const struct super_block *sb,
  87                 const char *fmt, ...)
  88 {
  89         struct va_format vaf;
  90         va_list args;
  91         int flen = 0;
  92
  93 #ifndef DEBUG
  94         if (!printk_ratelimit())
  95                 return;
  96 #endif
  97         if (function)
  98                 flen = strlen(function);
  99         va_start(args, fmt);
 100         vaf.fmt = fmt;
 101         vaf.va = &args;
 102         if (sb)
 103                 pr_err("(device %s): %s(): %pV\n",
 104                        sb->s_id, flen ? function : "", &vaf);
 105         else
 106                 pr_err("%s(): %pV\n", flen ? function : "", &vaf);
 107         va_end(args);
 108 }
 109
 110 #ifdef DEBUG
 111
 112 /* If 1, output debug messages, and if 0, don't. */
 113 int debug_msgs = 0;
 114
 115 void __ntfs_debug(const char *file, int line, const char *function,
 116                 const char *fmt, ...)
 117 {
 118         struct va_format vaf;
 119         va_list args;
 120         int flen = 0;
 121
 122         if (!debug_msgs)
 123                 return;
 124         if (function)
 125                 flen = strlen(function);
 126         va_start(args, fmt);
 127         vaf.fmt = fmt;
 128         vaf.va = &args;
 129         pr_debug("(%s, %d): %s(): %pV", file, line, flen ? function : "", &vaf);
 130         va_end(args);
 131 }
 132
 133 /* Dump a runlist. Caller has to provide synchronisation for @rl. */
 134 void ntfs_debug_dump_runlist(const runlist_element *rl)
 135 {
 136         int i;
 137         const char *lcn_str[5] = { "LCN_HOLE         ", "LCN_RL_NOT_MAPPED",
 138                                    "LCN_ENOENT       ", "LCN_unknown      " };
 139
 140         if (!debug_msgs)
 141                 return;
 142         pr_debug("Dumping runlist (values in hex):\n");
 143         if (!rl) {
 144                 pr_debug("Run list not present.\n");
 145                 return;
 146         }
 147         pr_debug("VCN              LCN               Run length\n");
 148         for (i = 0; ; i++) {
 149                 LCN lcn = (rl + i)->lcn;
 150
 151                 if (lcn < (LCN)0) {
 152                         int index = -lcn - 1;
 153
 154                         if (index > -LCN_ENOENT - 1)
 155                                 index = 3;
 156                         pr_debug("%-16Lx %s %-16Lx%s\n",
 157                                         (long long)(rl + i)->vcn, lcn_str[index],
 158                                         (long long)(rl + i)->length,
 159                                         (rl + i)->length ? "" :
 160                                                 " (runlist end)");
 161                 } else
 162                         pr_debug("%-16Lx %-16Lx  %-16Lx%s\n",
 163                                         (long long)(rl + i)->vcn,
 164                                         (long long)(rl + i)->lcn,
 165                                         (long long)(rl + i)->length,
 166                                         (rl + i)->length ? "" :
 167                                                 " (runlist end)");
 168                 if (!(rl + i)->length)
 169                         break;
 170         }
 171 }
 172
 173 #endif