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 <xfs.h>
  19 #include "debug.h"
  20 #include "spin.h"
  21
  22 static char             message[1024];  /* keep it off the stack */
  23 static DEFINE_SPINLOCK(xfs_err_lock);
  24
  25 /* Translate from CE_FOO to KERN_FOO, err_level(CE_FOO) == KERN_FOO */
  26 #define XFS_MAX_ERR_LEVEL       7
  27 #define XFS_ERR_MASK            ((1 << 3) - 1)
  28 static const char * const       err_level[XFS_MAX_ERR_LEVEL+1] =
  29                                         {KERN_EMERG, KERN_ALERT, KERN_CRIT,
  30                                          KERN_ERR, KERN_WARNING, KERN_NOTICE,
  31                                          KERN_INFO, KERN_DEBUG};
  32
  33 void
  34 cmn_err(register int level, char *fmt, ...)
  35 {
  36         char    *fp = fmt;
  37         int     len;
  38         ulong   flags;
  39         va_list ap;
  40
  41         level &= XFS_ERR_MASK;
  42         if (level > XFS_MAX_ERR_LEVEL)
  43                 level = XFS_MAX_ERR_LEVEL;
  44         spin_lock_irqsave(&xfs_err_lock,flags);
  45         va_start(ap, fmt);
  46         if (*fmt == '!') fp++;
  47         len = vsnprintf(message, sizeof(message), fp, ap);
  48         if (len >= sizeof(message))
  49                 len = sizeof(message) - 1;
  50         if (message[len-1] == '\n')
  51                 message[len-1] = 0;
  52         printk("%s%s\n", err_level[level], message);
  53         va_end(ap);
  54         spin_unlock_irqrestore(&xfs_err_lock,flags);
  55         BUG_ON(level == CE_PANIC);
  56 }
  57
  58 void
  59 icmn_err(register int level, char *fmt, va_list ap)
  60 {
  61         ulong   flags;
  62         int     len;
  63
  64         level &= XFS_ERR_MASK;
  65         if(level > XFS_MAX_ERR_LEVEL)
  66                 level = XFS_MAX_ERR_LEVEL;
  67         spin_lock_irqsave(&xfs_err_lock,flags);
  68         len = vsnprintf(message, sizeof(message), fmt, ap);
  69         if (len >= sizeof(message))
  70                 len = sizeof(message) - 1;
  71         if (message[len-1] == '\n')
  72                 message[len-1] = 0;
  73         printk("%s%s\n", err_level[level], message);
  74         spin_unlock_irqrestore(&xfs_err_lock,flags);
  75         BUG_ON(level == CE_PANIC);
  76 }
  77
  78 void
  79 assfail(char *expr, char *file, int line)
  80 {
  81         printk("Assertion failed: %s, file: %s, line: %d\n", expr, file, line);
  82         BUG();
  83 }
  84
  85 #if ((defined(DEBUG) || defined(INDUCE_IO_ERRROR)) && !defined(NO_WANT_RANDOM))
  86 unsigned long random(void)
  87 {
  88         static unsigned long    RandomValue = 1;
  89         /* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
  90         register long   rv = RandomValue;
  91         register long   lo;
  92         register long   hi;
  93
  94         hi = rv / 127773;
  95         lo = rv % 127773;
  96         rv = 16807 * lo - 2836 * hi;
  97         if (rv <= 0) rv += 2147483647;
  98         return RandomValue = rv;
  99 }
 100 #endif /* DEBUG || INDUCE_IO_ERRROR || !NO_WANT_RANDOM */