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[256];   /* 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 = vsprintf(message, fp, ap);
  48         if (level != CE_DEBUG && message[len-1] != '\n')
  49                 strcat(message, "\n");
  50         printk("%s%s", err_level[level], message);
  51         va_end(ap);
  52         spin_unlock_irqrestore(&xfs_err_lock,flags);
  53
  54         BUG_ON(level == CE_PANIC);
  55 }
  56
  57 void
  58 icmn_err(register int level, char *fmt, va_list ap)
  59 {
  60         ulong   flags;
  61         int     len;
  62
  63         level &= XFS_ERR_MASK;
  64         if(level > XFS_MAX_ERR_LEVEL)
  65                 level = XFS_MAX_ERR_LEVEL;
  66         spin_lock_irqsave(&xfs_err_lock,flags);
  67         len = vsprintf(message, fmt, ap);
  68         if (level != CE_DEBUG && message[len-1] != '\n')
  69                 strcat(message, "\n");
  70         spin_unlock_irqrestore(&xfs_err_lock,flags);
  71         printk("%s%s", err_level[level], message);
  72         BUG_ON(level == CE_PANIC);
  73 }
  74
  75 void
  76 assfail(char *expr, char *file, int line)
  77 {
  78         printk("Assertion failed: %s, file: %s, line: %d\n", expr, file, line);
  79         BUG();
  80 }
  81
  82 #if ((defined(DEBUG) || defined(INDUCE_IO_ERRROR)) && !defined(NO_WANT_RANDOM))
  83 unsigned long random(void)
  84 {
  85         static unsigned long    RandomValue = 1;
  86         /* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
  87         register long   rv = RandomValue;
  88         register long   lo;
  89         register long   hi;
  90
  91         hi = rv / 127773;
  92         lo = rv % 127773;
  93         rv = 16807 * lo - 2836 * hi;
  94         if (rv <= 0) rv += 2147483647;
  95         return RandomValue = rv;
  96 }
  97 #endif /* DEBUG || INDUCE_IO_ERRROR || !NO_WANT_RANDOM */