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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",

                                        (long long)(rl + i)->vcn, lcn_str[index],

                                        (long long)(rl + i)->length,

                                        (rl + i)->length ? "" :

                                                " (runlist end)");

                } else

                        printk(KERN_DEBUG "%-16Lx %-16Lx  %-16Lx%s\n",

                                        (long long)(rl + i)->vcn,

                                        (long long)(rl + i)->lcn,

                                        (long long)(rl + i)->length,

                                        (rl + i)->length ? "" :

                                                " (runlist end)");

                if (!(rl + i)->length)

                        break;

        }

}

#endif