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/*
* debug.c - NTFS kernel debug support. Part of the Linux-NTFS project.
*
* Copyright (c) 2001-2004 Anton Altaparmakov
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program/include file is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (in the main directory of the Linux-NTFS
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "debug.h"
/*
* A static buffer to hold the error string being displayed and a spinlock
* to protect concurrent accesses to it.
*/
static char err_buf[1024];
static DEFINE_SPINLOCK(err_buf_lock);
/**
* __ntfs_warning - output a warning to the syslog
* @function: name of function outputting the warning
* @sb: super block of mounted ntfs filesystem
* @fmt: warning string containing format specifications
* @...: a variable number of arguments specified in @fmt
*
* Outputs a warning to the syslog for the mounted ntfs filesystem described
* by @sb.
*
* @fmt and the corresponding @... is printf style format string containing
* the warning string and the corresponding format arguments, respectively.
*
* @function is the name of the function from which __ntfs_warning is being
* called.
*
* Note, you should be using debug.h::ntfs_warning(@sb, @fmt, @...) instead
* as this provides the @function parameter automatically.
*/
void __ntfs_warning(const char *function, const struct super_block *sb,
const char *fmt, ...)
{
va_list args;
int flen = 0;
#ifndef DEBUG
if (!printk_ratelimit())
return;
#endif
if (function)
flen = strlen(function);
spin_lock(&err_buf_lock);
va_start(args, fmt);
vsnprintf(err_buf, sizeof(err_buf), fmt, args);
va_end(args);
if (sb)
printk(KERN_ERR "NTFS-fs warning (device %s): %s(): %s\n",
sb->s_id, flen ? function : "", err_buf);
else
printk(KERN_ERR "NTFS-fs warning: %s(): %s\n",
flen ? function : "", err_buf);
spin_unlock(&err_buf_lock);
}
/**
* __ntfs_error - output an error to the syslog
* @function: name of function outputting the error
* @sb: super block of mounted ntfs filesystem
* @fmt: error string containing format specifications
* @...: a variable number of arguments specified in @fmt
*
* Outputs an error to the syslog for the mounted ntfs filesystem described
* by @sb.
*
* @fmt and the corresponding @... is printf style format string containing
* the error string and the corresponding format arguments, respectively.
*
* @function is the name of the function from which __ntfs_error is being
* called.
*
* Note, you should be using debug.h::ntfs_error(@sb, @fmt, @...) instead
* as this provides the @function parameter automatically.
*/
void __ntfs_error(const char *function, const struct super_block *sb,
const char *fmt, ...)
{
va_list args;
int flen = 0;
#ifndef DEBUG
if (!printk_ratelimit())
return;
#endif
if (function)
flen = strlen(function);
spin_lock(&err_buf_lock);
va_start(args, fmt);
vsnprintf(err_buf, sizeof(err_buf), fmt, args);
va_end(args);
if (sb)
printk(KERN_ERR "NTFS-fs error (device %s): %s(): %s\n",
sb->s_id, flen ? function : "", err_buf);
else
printk(KERN_ERR "NTFS-fs error: %s(): %s\n",
flen ? function : "", err_buf);
spin_unlock(&err_buf_lock);
}
#ifdef DEBUG
/* If 1, output debug messages, and if 0, don't. */
int debug_msgs = 0;
void __ntfs_debug (const char *file, int line, const char *function,
const char *fmt, ...)
{
va_list args;
int flen = 0;
if (!debug_msgs)
return;
if (function)
flen = strlen(function);
spin_lock(&err_buf_lock);
va_start(args, fmt);
vsnprintf(err_buf, sizeof(err_buf), fmt, args);
va_end(args);
printk(KERN_DEBUG "NTFS-fs DEBUG (%s, %d): %s(): %s\n", file, line,
flen ? function : "", err_buf);
spin_unlock(&err_buf_lock);
}
/* Dump a runlist. Caller has to provide synchronisation for @rl. */
void ntfs_debug_dump_runlist(const runlist_element *rl)
{
int i;
const char *lcn_str[5] = { "LCN_HOLE ", "LCN_RL_NOT_MAPPED",
"LCN_ENOENT ", "LCN_unknown " };
if (!debug_msgs)
return;
printk(KERN_DEBUG "NTFS-fs DEBUG: Dumping runlist (values in hex):\n");
if (!rl) {
printk(KERN_DEBUG "Run list not present.\n");
return;
}
printk(KERN_DEBUG "VCN LCN Run length\n");
for (i = 0; ; i++) {
LCN lcn = (rl + i)->lcn;
if (lcn < (LCN)0) {
int index = -lcn - 1;
if (index > -LCN_ENOENT - 1)
index = 3;
printk(KERN_DEBUG "%-16Lx %s %-16Lx%s\n",
(rl + i)->vcn, lcn_str[index],
(rl + i)->length, (rl + i)->length ?
"" : " (runlist end)");
} else
printk(KERN_DEBUG "%-16Lx %-16Lx %-16Lx%s\n",
(rl + i)->vcn, (rl + i)->lcn,
(rl + i)->length, (rl + i)->length ?
"" : " (runlist end)");
if (!(rl + i)->length)
break;
}
}
#endif
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