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 /* CSTYLED */
  37 module_param(spl_panic_halt, uint, 0644);
  38 MODULE_PARM_DESC(spl_panic_halt, "Cause kernel panic on assertion failures");
  39
  40 void
  41 spl_dumpstack(void)
  42 {
  43         printk("Showing stack for process %d\n", current->pid);
  44         dump_stack();
  45 }
  46 EXPORT_SYMBOL(spl_dumpstack);
  47
  48 void
  49 spl_panic(const char *file, const char *func, int line, const char *fmt, ...)
  50 {
  51         const char *newfile;
  52         char msg[MAXMSGLEN];
  53         va_list ap;
  54
  55         newfile = strrchr(file, '/');
  56         if (newfile != NULL)
  57                 newfile = newfile + 1;
  58         else
  59                 newfile = file;
  60
  61         va_start(ap, fmt);
  62         (void) vsnprintf(msg, sizeof (msg), fmt, ap);
  63         va_end(ap);
  64
  65         printk(KERN_EMERG "%s", msg);
  66         printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func);
  67         if (spl_panic_halt)
  68                 panic("%s", msg);
  69
  70         spl_dumpstack();
  71
  72         /* Halt the thread to facilitate further debugging */
  73         set_current_state(TASK_UNINTERRUPTIBLE);
  74         while (1)
  75                 schedule();
  76
  77         /* Unreachable */
  78 }
  79 EXPORT_SYMBOL(spl_panic);
  80
  81 void
  82 vcmn_err(int ce, const char *fmt, va_list ap)
  83 {
  84         char msg[MAXMSGLEN];
  85
  86         vsnprintf(msg, MAXMSGLEN, fmt, ap);
  87
  88         switch (ce) {
  89         case CE_IGNORE:
  90                 break;
  91         case CE_CONT:
  92                 printk("%s", msg);
  93                 break;
  94         case CE_NOTE:
  95                 printk(KERN_NOTICE "NOTICE: %s\n", msg);
  96                 break;
  97         case CE_WARN:
  98                 printk(KERN_WARNING "WARNING: %s\n", msg);
  99                 break;
 100         case CE_PANIC:
 101                 printk(KERN_EMERG "PANIC: %s\n", msg);
 102                 if (spl_panic_halt)
 103                         panic("%s", msg);
 104
 105                 spl_dumpstack();
 106
 107                 /* Halt the thread to facilitate further debugging */
 108                 set_current_state(TASK_UNINTERRUPTIBLE);
 109                 while (1)
 110                         schedule();
 111         }
 112 } /* vcmn_err() */
 113 EXPORT_SYMBOL(vcmn_err);
 114
 115 void
 116 cmn_err(int ce, const char *fmt, ...)
 117 {
 118         va_list ap;
 119
 120         va_start(ap, fmt);
 121         vcmn_err(ce, fmt, ap);
 122         va_end(ap);
 123 } /* cmn_err() */
 124 EXPORT_SYMBOL(cmn_err);