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
  22 #include "debug.h"
  23
  24 /*
  25  * A static buffer to hold the error string being displayed and a spinlock
  26  * to protect concurrent accesses to it.
  27  */
  28 static char err_buf[1024];
  29 static DEFINE_SPINLOCK(err_buf_lock);
  30
  31 /**
  32  * __ntfs_warning - output a warning to the syslog
  33  * @function:   name of function outputting the warning
  34  * @sb:         super block of mounted ntfs filesystem
  35  * @fmt:        warning string containing format specifications
  36  * @...:        a variable number of arguments specified in @fmt
  37  *
  38  * Outputs a warning to the syslog for the mounted ntfs filesystem described
  39  * by @sb.
  40  *
  41  * @fmt and the corresponding @... is printf style format string containing
  42  * the warning string and the corresponding format arguments, respectively.
  43  *
  44  * @function is the name of the function from which __ntfs_warning is being
  45  * called.
  46  *
  47  * Note, you should be using debug.h::ntfs_warning(@sb, @fmt, @...) instead
  48  * as this provides the @function parameter automatically.
  49  */
  50 void __ntfs_warning(const char *function, const struct super_block *sb,
  51                 const char *fmt, ...)
  52 {
  53         va_list args;
  54         int flen = 0;
  55
  56 #ifndef DEBUG
  57         if (!printk_ratelimit())
  58                 return;
  59 #endif
  60         if (function)
  61                 flen = strlen(function);
  62         spin_lock(&err_buf_lock);
  63         va_start(args, fmt);
  64         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
  65         va_end(args);
  66         if (sb)
  67                 printk(KERN_ERR "NTFS-fs warning (device %s): %s(): %s\n",
  68                                 sb->s_id, flen ? function : "", err_buf);
  69         else
  70                 printk(KERN_ERR "NTFS-fs warning: %s(): %s\n",
  71                                 flen ? function : "", err_buf);
  72         spin_unlock(&err_buf_lock);
  73 }
  74
  75 /**
  76  * __ntfs_error - output an error to the syslog
  77  * @function:   name of function outputting the error
  78  * @sb:         super block of mounted ntfs filesystem
  79  * @fmt:        error string containing format specifications
  80  * @...:        a variable number of arguments specified in @fmt
  81  *
  82  * Outputs an error to the syslog for the mounted ntfs filesystem described
  83  * by @sb.
  84  *
  85  * @fmt and the corresponding @... is printf style format string containing
  86  * the error string and the corresponding format arguments, respectively.
  87  *
  88  * @function is the name of the function from which __ntfs_error is being
  89  * called.
  90  *
  91  * Note, you should be using debug.h::ntfs_error(@sb, @fmt, @...) instead
  92  * as this provides the @function parameter automatically.
  93  */
  94 void __ntfs_error(const char *function, const struct super_block *sb,
  95                 const char *fmt, ...)
  96 {
  97         va_list args;
  98         int flen = 0;
  99
 100 #ifndef DEBUG
 101         if (!printk_ratelimit())
 102                 return;
 103 #endif
 104         if (function)
 105                 flen = strlen(function);
 106         spin_lock(&err_buf_lock);
 107         va_start(args, fmt);
 108         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
 109         va_end(args);
 110         if (sb)
 111                 printk(KERN_ERR "NTFS-fs error (device %s): %s(): %s\n",
 112                                 sb->s_id, flen ? function : "", err_buf);
 113         else
 114                 printk(KERN_ERR "NTFS-fs error: %s(): %s\n",
 115                                 flen ? function : "", err_buf);
 116         spin_unlock(&err_buf_lock);
 117 }
 118
 119 #ifdef DEBUG
 120
 121 /* If 1, output debug messages, and if 0, don't. */
 122 int debug_msgs = 0;
 123
 124 void __ntfs_debug (const char *file, int line, const char *function,
 125                 const char *fmt, ...)
 126 {
 127         va_list args;
 128         int flen = 0;
 129
 130         if (!debug_msgs)
 131                 return;
 132         if (function)
 133                 flen = strlen(function);
 134         spin_lock(&err_buf_lock);
 135         va_start(args, fmt);
 136         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
 137         va_end(args);
 138         printk(KERN_DEBUG "NTFS-fs DEBUG (%s, %d): %s(): %s\n", file, line,
 139                         flen ? function : "", err_buf);
 140         spin_unlock(&err_buf_lock);
 141 }
 142
 143 /* Dump a runlist. Caller has to provide synchronisation for @rl. */
 144 void ntfs_debug_dump_runlist(const runlist_element *rl)
 145 {
 146         int i;
 147         const char *lcn_str[5] = { "LCN_HOLE         ", "LCN_RL_NOT_MAPPED",
 148                                    "LCN_ENOENT       ", "LCN_unknown      " };
 149
 150         if (!debug_msgs)
 151                 return;
 152         printk(KERN_DEBUG "NTFS-fs DEBUG: Dumping runlist (values in hex):\n");
 153         if (!rl) {
 154                 printk(KERN_DEBUG "Run list not present.\n");
 155                 return;
 156         }
 157         printk(KERN_DEBUG "VCN              LCN               Run length\n");
 158         for (i = 0; ; i++) {
 159                 LCN lcn = (rl + i)->lcn;
 160
 161                 if (lcn < (LCN)0) {
 162                         int index = -lcn - 1;
 163
 164                         if (index > -LCN_ENOENT - 1)
 165                                 index = 3;
 166                         printk(KERN_DEBUG "%-16Lx %s %-16Lx%s\n",
 167                                         (long long)(rl + i)->vcn, lcn_str[index],
 168                                         (long long)(rl + i)->length,
 169                                         (rl + i)->length ? "" :
 170                                                 " (runlist end)");
 171                 } else
 172                         printk(KERN_DEBUG "%-16Lx %-16Lx  %-16Lx%s\n",
 173                                         (long long)(rl + i)->vcn,
 174                                         (long long)(rl + i)->lcn,
 175                                         (long long)(rl + i)->length,
 176                                         (rl + i)->length ? "" :
 177                                                 " (runlist end)");
 178                 if (!(rl + i)->length)
 179                         break;
 180         }
 181 }
 182
 183 #endif