linux/fs/ntfs/debug.c
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   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 */
  28static char err_buf[1024];
  29static 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 */
  50void __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 */
  94void __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. */
 122int debug_msgs = 0;
 123
 124void __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. */
 144void 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
 184
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