module/os/linux/spl/spl-err.c

   1 /*
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *
  10  *  The SPL is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License as published by the
  12  *  Free Software Foundation; either version 2 of the License, or (at your
  13  *  option) any later version.
  14  *
  15  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  16  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18  *  for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  22  *
  23  *  Solaris Porting Layer (SPL) Error Implementation.
  24  */
  25
  26 #include <sys/sysmacros.h>
  27 #include <sys/cmn_err.h>
  28
  29 /*
  30  * It is often useful to actually have the panic crash the node so you
  31  * can then get notified of the event, get the crashdump for later
  32  * analysis and other such goodies.
  33  * But we would still default to the current default of not to do that.
  34  */
  35 static unsigned int spl_panic_halt;
  36 module_param(spl_panic_halt, uint, 0644);
  37 MODULE_PARM_DESC(spl_panic_halt, "Cause kernel panic on assertion failures");
  38
  39 void
  40 spl_dumpstack(void)
  41 {
  42         printk("Showing stack for process %d\n", current->pid);
  43         dump_stack();
  44 }
  45 EXPORT_SYMBOL(spl_dumpstack);
  46
  47 void
  48 spl_panic(const char *file, const char *func, int line, const char *fmt, ...)
  49 {
  50         const char *newfile;
  51         char msg[MAXMSGLEN];
  52         va_list ap;
  53
  54         newfile = strrchr(file, '/');
  55         if (newfile != NULL)
  56                 newfile = newfile + 1;
  57         else
  58                 newfile = file;
  59
  60         va_start(ap, fmt);
  61         (void) vsnprintf(msg, sizeof (msg), fmt, ap);
  62         va_end(ap);
  63
  64         printk(KERN_EMERG "%s", msg);
  65         printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func);
  66         if (spl_panic_halt)
  67                 panic("%s", msg);
  68
  69         spl_dumpstack();
  70
  71         /* Halt the thread to facilitate further debugging */
  72         set_current_state(TASK_UNINTERRUPTIBLE);
  73         while (1)
  74                 schedule();
  75
  76         /* Unreachable */
  77 }
  78 EXPORT_SYMBOL(spl_panic);
  79
  80 void
  81 vcmn_err(int ce, const char *fmt, va_list ap)
  82 {
  83         char msg[MAXMSGLEN];
  84
  85         vsnprintf(msg, MAXMSGLEN, fmt, ap);
  86
  87         switch (ce) {
  88         case CE_IGNORE:
  89                 break;
  90         case CE_CONT:
  91                 printk("%s", msg);
  92                 break;
  93         case CE_NOTE:
  94                 printk(KERN_NOTICE "NOTICE: %s\n", msg);
  95                 break;
  96         case CE_WARN:
  97                 printk(KERN_WARNING "WARNING: %s\n", msg);
  98                 break;
  99         case CE_PANIC:
 100                 printk(KERN_EMERG "PANIC: %s\n", msg);
 101                 if (spl_panic_halt)
 102                         panic("%s", msg);
 103
 104                 spl_dumpstack();
 105
 106                 /* Halt the thread to facilitate further debugging */
 107                 set_current_state(TASK_UNINTERRUPTIBLE);
 108                 while (1)
 109                         schedule();
 110         }
 111 } /* vcmn_err() */
 112 EXPORT_SYMBOL(vcmn_err);
 113
 114 void
 115 cmn_err(int ce, const char *fmt, ...)
 116 {
 117         va_list ap;
 118
 119         va_start(ap, fmt);
 120         vcmn_err(ce, fmt, ap);
 121         va_end(ap);
 122 } /* cmn_err() */
 123 EXPORT_SYMBOL(cmn_err);