fs/xfs/support/debug.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "debug.h"
  19 #include "spin.h"
  20 #include <asm/page.h>
  21 #include <linux/sched.h>
  22 #include <linux/kernel.h>
  23
  24 static char             message[256];   /* keep it off the stack */
  25 static DEFINE_SPINLOCK(xfs_err_lock);
  26
  27 /* Translate from CE_FOO to KERN_FOO, err_level(CE_FOO) == KERN_FOO */
  28 #define XFS_MAX_ERR_LEVEL       7
  29 #define XFS_ERR_MASK            ((1 << 3) - 1)
  30 static const char * const       err_level[XFS_MAX_ERR_LEVEL+1] =
  31                                         {KERN_EMERG, KERN_ALERT, KERN_CRIT,
  32                                          KERN_ERR, KERN_WARNING, KERN_NOTICE,
  33                                          KERN_INFO, KERN_DEBUG};
  34
  35 void
  36 cmn_err(register int level, char *fmt, ...)
  37 {
  38         char    *fp = fmt;
  39         int     len;
  40         ulong   flags;
  41         va_list ap;
  42
  43         level &= XFS_ERR_MASK;
  44         if (level > XFS_MAX_ERR_LEVEL)
  45                 level = XFS_MAX_ERR_LEVEL;
  46         spin_lock_irqsave(&xfs_err_lock,flags);
  47         va_start(ap, fmt);
  48         if (*fmt == '!') fp++;
  49         len = vsprintf(message, fp, ap);
  50         if (level != CE_DEBUG && message[len-1] != '\n')
  51                 strcat(message, "\n");
  52         printk("%s%s", err_level[level], message);
  53         va_end(ap);
  54         spin_unlock_irqrestore(&xfs_err_lock,flags);
  55
  56         if (level == CE_PANIC)
  57                 BUG();
  58 }
  59
  60 void
  61 icmn_err(register int level, char *fmt, va_list ap)
  62 {
  63         ulong   flags;
  64         int     len;
  65
  66         level &= XFS_ERR_MASK;
  67         if(level > XFS_MAX_ERR_LEVEL)
  68                 level = XFS_MAX_ERR_LEVEL;
  69         spin_lock_irqsave(&xfs_err_lock,flags);
  70         len = vsprintf(message, fmt, ap);
  71         if (level != CE_DEBUG && message[len-1] != '\n')
  72                 strcat(message, "\n");
  73         spin_unlock_irqrestore(&xfs_err_lock,flags);
  74         printk("%s%s", err_level[level], message);
  75         if (level == CE_PANIC)
  76                 BUG();
  77 }
  78
  79 void
  80 assfail(char *expr, char *file, int line)
  81 {
  82         printk("Assertion failed: %s, file: %s, line: %d\n", expr, file, line);
  83         BUG();
  84 }
  85
  86 #if ((defined(DEBUG) || defined(INDUCE_IO_ERRROR)) && !defined(NO_WANT_RANDOM))
  87 unsigned long random(void)
  88 {
  89         static unsigned long    RandomValue = 1;
  90         /* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
  91         register long   rv = RandomValue;
  92         register long   lo;
  93         register long   hi;
  94
  95         hi = rv / 127773;
  96         lo = rv % 127773;
  97         rv = 16807 * lo - 2836 * hi;
  98         if (rv <= 0) rv += 2147483647;
  99         return RandomValue = rv;
 100 }
 101 #endif /* DEBUG || INDUCE_IO_ERRROR || !NO_WANT_RANDOM */