fs/ntfs/debug.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * debug.c - NTFS kernel debug support. Part of the Linux-NTFS project.
   4  *
   5  * Copyright (c) 2001-2004 Anton Altaparmakov
   6  */
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8 #include "debug.h"
   9
  10 /**
  11  * __ntfs_warning - output a warning to the syslog
  12  * @function:   name of function outputting the warning
  13  * @sb:         super block of mounted ntfs filesystem
  14  * @fmt:        warning string containing format specifications
  15  * @...:        a variable number of arguments specified in @fmt
  16  *
  17  * Outputs a warning to the syslog for the mounted ntfs filesystem described
  18  * by @sb.
  19  *
  20  * @fmt and the corresponding @... is printf style format string containing
  21  * the warning string and the corresponding format arguments, respectively.
  22  *
  23  * @function is the name of the function from which __ntfs_warning is being
  24  * called.
  25  *
  26  * Note, you should be using debug.h::ntfs_warning(@sb, @fmt, @...) instead
  27  * as this provides the @function parameter automatically.
  28  */
  29 void __ntfs_warning(const char *function, const struct super_block *sb,
  30                 const char *fmt, ...)
  31 {
  32         struct va_format vaf;
  33         va_list args;
  34         int flen = 0;
  35
  36 #ifndef DEBUG
  37         if (!printk_ratelimit())
  38                 return;
  39 #endif
  40         if (function)
  41                 flen = strlen(function);
  42         va_start(args, fmt);
  43         vaf.fmt = fmt;
  44         vaf.va = &args;
  45         if (sb)
  46                 pr_warn("(device %s): %s(): %pV\n",
  47                         sb->s_id, flen ? function : "", &vaf);
  48         else
  49                 pr_warn("%s(): %pV\n", flen ? function : "", &vaf);
  50         va_end(args);
  51 }
  52
  53 /**
  54  * __ntfs_error - output an error to the syslog
  55  * @function:   name of function outputting the error
  56  * @sb:         super block of mounted ntfs filesystem
  57  * @fmt:        error string containing format specifications
  58  * @...:        a variable number of arguments specified in @fmt
  59  *
  60  * Outputs an error to the syslog for the mounted ntfs filesystem described
  61  * by @sb.
  62  *
  63  * @fmt and the corresponding @... is printf style format string containing
  64  * the error string and the corresponding format arguments, respectively.
  65  *
  66  * @function is the name of the function from which __ntfs_error is being
  67  * called.
  68  *
  69  * Note, you should be using debug.h::ntfs_error(@sb, @fmt, @...) instead
  70  * as this provides the @function parameter automatically.
  71  */
  72 void __ntfs_error(const char *function, const struct super_block *sb,
  73                 const char *fmt, ...)
  74 {
  75         struct va_format vaf;
  76         va_list args;
  77         int flen = 0;
  78
  79 #ifndef DEBUG
  80         if (!printk_ratelimit())
  81                 return;
  82 #endif
  83         if (function)
  84                 flen = strlen(function);
  85         va_start(args, fmt);
  86         vaf.fmt = fmt;
  87         vaf.va = &args;
  88         if (sb)
  89                 pr_err("(device %s): %s(): %pV\n",
  90                        sb->s_id, flen ? function : "", &vaf);
  91         else
  92                 pr_err("%s(): %pV\n", flen ? function : "", &vaf);
  93         va_end(args);
  94 }
  95
  96 #ifdef DEBUG
  97
  98 /* If 1, output debug messages, and if 0, don't. */
  99 int debug_msgs = 0;
 100
 101 void __ntfs_debug(const char *file, int line, const char *function,
 102                 const char *fmt, ...)
 103 {
 104         struct va_format vaf;
 105         va_list args;
 106         int flen = 0;
 107
 108         if (!debug_msgs)
 109                 return;
 110         if (function)
 111                 flen = strlen(function);
 112         va_start(args, fmt);
 113         vaf.fmt = fmt;
 114         vaf.va = &args;
 115         pr_debug("(%s, %d): %s(): %pV", file, line, flen ? function : "", &vaf);
 116         va_end(args);
 117 }
 118
 119 /* Dump a runlist. Caller has to provide synchronisation for @rl. */
 120 void ntfs_debug_dump_runlist(const runlist_element *rl)
 121 {
 122         int i;
 123         const char *lcn_str[5] = { "LCN_HOLE         ", "LCN_RL_NOT_MAPPED",
 124                                    "LCN_ENOENT       ", "LCN_unknown      " };
 125
 126         if (!debug_msgs)
 127                 return;
 128         pr_debug("Dumping runlist (values in hex):\n");
 129         if (!rl) {
 130                 pr_debug("Run list not present.\n");
 131                 return;
 132         }
 133         pr_debug("VCN              LCN               Run length\n");
 134         for (i = 0; ; i++) {
 135                 LCN lcn = (rl + i)->lcn;
 136
 137                 if (lcn < (LCN)0) {
 138                         int index = -lcn - 1;
 139
 140                         if (index > -LCN_ENOENT - 1)
 141                                 index = 3;
 142                         pr_debug("%-16Lx %s %-16Lx%s\n",
 143                                         (long long)(rl + i)->vcn, lcn_str[index],
 144                                         (long long)(rl + i)->length,
 145                                         (rl + i)->length ? "" :
 146                                                 " (runlist end)");
 147                 } else
 148                         pr_debug("%-16Lx %-16Lx  %-16Lx%s\n",
 149                                         (long long)(rl + i)->vcn,
 150                                         (long long)(rl + i)->lcn,
 151                                         (long long)(rl + i)->length,
 152                                         (rl + i)->length ? "" :
 153                                                 " (runlist end)");
 154                 if (!(rl + i)->length)
 155                         break;
 156         }
 157 }
 158
 159 #endif