kern_shutdown.c

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    1 /*-
    2  * Copyright (c) 1986, 1988, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)kern_shutdown.c     8.3 (Berkeley) 1/21/94
   39  * $FreeBSD: releng/5.0/sys/kern/kern_shutdown.c 107036 2002-11-18 02:41:03Z alfred $
   40  */
   41 
   42 #include "opt_ddb.h"
   43 #include "opt_ddb_trace.h"
   44 #include "opt_ddb_unattended.h"
   45 #include "opt_hw_wdog.h"
   46 #include "opt_mac.h"
   47 #include "opt_panic.h"
   48 #include "opt_show_busybufs.h"
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/bio.h>
   53 #include <sys/buf.h>
   54 #include <sys/conf.h>
   55 #include <sys/cons.h>
   56 #include <sys/disklabel.h>
   57 #include <sys/eventhandler.h>
   58 #include <sys/kernel.h>
   59 #include <sys/kthread.h>
   60 #include <sys/mac.h>
   61 #include <sys/malloc.h>
   62 #include <sys/mount.h>
   63 #include <sys/proc.h>
   64 #include <sys/reboot.h>
   65 #include <sys/resourcevar.h>
   66 #include <sys/smp.h>            /* smp_active */
   67 #include <sys/sysctl.h>
   68 #include <sys/sysproto.h>
   69 #include <sys/vnode.h>
   70 
   71 #include <machine/pcb.h>
   72 #include <machine/md_var.h>
   73 #include <machine/smp.h>
   74 
   75 #include <sys/signalvar.h>
   76 #ifdef DDB
   77 #include <ddb/ddb.h>
   78 #endif
   79 
   80 #ifndef PANIC_REBOOT_WAIT_TIME
   81 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   82 #endif
   83 
   84 /*
   85  * Note that stdarg.h and the ANSI style va_start macro is used for both
   86  * ANSI and traditional C compilers.
   87  */
   88 #include <machine/stdarg.h>
   89 
   90 #ifdef DDB
   91 #ifdef DDB_UNATTENDED
   92 int debugger_on_panic = 0;
   93 #else
   94 int debugger_on_panic = 1;
   95 #endif
   96 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
   97         &debugger_on_panic, 0, "Run debugger on kernel panic");
   98 
   99 #ifdef DDB_TRACE
  100 int trace_on_panic = 1;
  101 #else
  102 int trace_on_panic = 0;
  103 #endif
  104 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
  105         &trace_on_panic, 0, "Print stack trace on kernel panic");
  106 #endif
  107 
  108 int sync_on_panic = 1;
  109 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  110         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  111 
  112 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  113 
  114 #ifdef  HW_WDOG
  115 /*
  116  * If there is a hardware watchdog, point this at the function needed to
  117  * hold it off.
  118  * It's needed when the kernel needs to do some lengthy operations.
  119  * e.g. in wd.c when dumping core.. It's most annoying to have
  120  * your precious core-dump only half written because the wdog kicked in.
  121  */
  122 watchdog_tickle_fn wdog_tickler = NULL;
  123 #endif  /* HW_WDOG */
  124 
  125 /*
  126  * Variable panicstr contains argument to first call to panic; used as flag
  127  * to indicate that the kernel has already called panic.
  128  */
  129 const char *panicstr;
  130 
  131 int dumping;                            /* system is dumping */
  132 static struct dumperinfo dumper;        /* our selected dumper */
  133 static struct pcb dumppcb;              /* "You Are Here" sign for dump-debuggers */
  134 
  135 static void boot(int) __dead2;
  136 static void poweroff_wait(void *, int);
  137 static void shutdown_halt(void *junk, int howto);
  138 static void shutdown_panic(void *junk, int howto);
  139 static void shutdown_reset(void *junk, int howto);
  140 
  141 /* register various local shutdown events */
  142 static void 
  143 shutdown_conf(void *unused)
  144 {
  145         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
  146         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
  147         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
  148         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
  149 }
  150 
  151 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
  152 
  153 /*
  154  * The system call that results in a reboot
  155  *
  156  * MPSAFE
  157  */
  158 /* ARGSUSED */
  159 int
  160 reboot(struct thread *td, struct reboot_args *uap)
  161 {
  162         int error;
  163 
  164         error = 0;
  165 #ifdef MAC
  166         error = mac_check_system_reboot(td->td_ucred, uap->opt);
  167 #endif
  168         if (error == 0)
  169                 error = suser(td);
  170         if (error == 0) {
  171                 mtx_lock(&Giant);
  172                 boot(uap->opt);
  173                 mtx_unlock(&Giant);
  174         }
  175         return (error);
  176 }
  177 
  178 /*
  179  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  180  */
  181 static int shutdown_howto = 0;
  182 
  183 void
  184 shutdown_nice(int howto)
  185 {
  186         shutdown_howto = howto;
  187         
  188         /* Send a signal to init(8) and have it shutdown the world */
  189         if (initproc != NULL) {
  190                 PROC_LOCK(initproc);
  191                 psignal(initproc, SIGINT);
  192                 PROC_UNLOCK(initproc);
  193         } else {
  194                 /* No init(8) running, so simply reboot */
  195                 boot(RB_NOSYNC);
  196         }
  197         return;
  198 }
  199 static int      waittime = -1;
  200 
  201 static void
  202 print_uptime(void)
  203 {
  204         int f;
  205         struct timespec ts;
  206 
  207         getnanouptime(&ts);
  208         printf("Uptime: ");
  209         f = 0;
  210         if (ts.tv_sec >= 86400) {
  211                 printf("%ldd", (long)ts.tv_sec / 86400);
  212                 ts.tv_sec %= 86400;
  213                 f = 1;
  214         }
  215         if (f || ts.tv_sec >= 3600) {
  216                 printf("%ldh", (long)ts.tv_sec / 3600);
  217                 ts.tv_sec %= 3600;
  218                 f = 1;
  219         }
  220         if (f || ts.tv_sec >= 60) {
  221                 printf("%ldm", (long)ts.tv_sec / 60);
  222                 ts.tv_sec %= 60;
  223                 f = 1;
  224         }
  225         printf("%lds\n", (long)ts.tv_sec);
  226 }
  227 
  228 static void
  229 doadump(void)
  230 {
  231         savectx(&dumppcb);
  232         dumping++;
  233         dumpsys(&dumper);
  234 }
  235 
  236 /*
  237  *  Go through the rigmarole of shutting down..
  238  * this used to be in machdep.c but I'll be dammned if I could see
  239  * anything machine dependant in it.
  240  */
  241 static void
  242 boot(int howto)
  243 {
  244 
  245         /* collect extra flags that shutdown_nice might have set */
  246         howto |= shutdown_howto;
  247 
  248 #ifdef DDB
  249         /* We are out of the debugger now. */
  250         db_active = 0;
  251 #endif
  252 
  253 #ifdef SMP
  254         if (smp_active)
  255                 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
  256 #endif
  257         /*
  258          * Do any callouts that should be done BEFORE syncing the filesystems.
  259          */
  260         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  261 
  262         /* 
  263          * Now sync filesystems
  264          */
  265         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  266                 register struct buf *bp;
  267                 int iter, nbusy, pbusy;
  268                 int subiter;
  269 
  270                 waittime = 0;
  271                 printf("\nsyncing disks, buffers remaining... ");
  272 
  273                 sync(&thread0, NULL);
  274 
  275                 /*
  276                  * With soft updates, some buffers that are
  277                  * written will be remarked as dirty until other
  278                  * buffers are written.
  279                  */
  280                 for (iter = pbusy = 0; iter < 20; iter++) {
  281                         nbusy = 0;
  282                         for (bp = &buf[nbuf]; --bp >= buf; ) {
  283                                 if ((bp->b_flags & B_INVAL) == 0 &&
  284                                     BUF_REFCNT(bp) > 0) {
  285                                         nbusy++;
  286                                 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
  287                                                 == B_DELWRI) {
  288                                         /* bawrite(bp);*/
  289                                         nbusy++;
  290                                 }
  291                         }
  292                         if (nbusy == 0)
  293                                 break;
  294                         printf("%d ", nbusy);
  295                         if (nbusy < pbusy)
  296                                 iter = 0;
  297                         pbusy = nbusy;
  298                         sync(&thread0, NULL);
  299                         if (curthread != NULL) {
  300                                 DROP_GIANT();
  301                                 for (subiter = 0; subiter < 50 * iter; subiter++) {
  302                                         mtx_lock_spin(&sched_lock);
  303                                         curthread->td_proc->p_stats->p_ru.ru_nvcsw++;
  304                                         mi_switch(); /* Allow interrupt threads to run */
  305                                         mtx_unlock_spin(&sched_lock);
  306                                         DELAY(1000);
  307                                 }
  308                                 PICKUP_GIANT();
  309                         } else
  310                         DELAY(50000 * iter);
  311                 }
  312                 printf("\n");
  313                 /*
  314                  * Count only busy local buffers to prevent forcing 
  315                  * a fsck if we're just a client of a wedged NFS server
  316                  */
  317                 nbusy = 0;
  318                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  319                         if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
  320                             ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
  321                                 if (bp->b_dev == NODEV) {
  322                                         TAILQ_REMOVE(&mountlist,
  323                                             bp->b_vp->v_mount, mnt_list);
  324                                         continue;
  325                                 }
  326                                 nbusy++;
  327 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  328                                 printf(
  329                             "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
  330                                     nbusy, devtoname(bp->b_dev),
  331                                     bp->b_flags, (long)bp->b_blkno,
  332                                     (long)bp->b_lblkno);
  333 #endif
  334                         }
  335                 }
  336                 if (nbusy) {
  337                         /*
  338                          * Failed to sync all blocks. Indicate this and don't
  339                          * unmount filesystems (thus forcing an fsck on reboot).
  340                          */
  341                         printf("giving up on %d buffers\n", nbusy);
  342                         DELAY(5000000); /* 5 seconds */
  343                 } else {
  344                         printf("done\n");
  345                         /*
  346                          * Unmount filesystems
  347                          */
  348                         if (panicstr == 0)
  349                                 vfs_unmountall();
  350                 }
  351                 DELAY(100000);          /* wait for console output to finish */
  352         }
  353 
  354         print_uptime();
  355 
  356         /*
  357          * Ok, now do things that assume all filesystem activity has
  358          * been completed.
  359          */
  360         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  361         splhigh();
  362         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP &&
  363             !cold && dumper.dumper != NULL && !dumping) 
  364                 doadump();
  365 
  366         /* Now that we're going to really halt the system... */
  367         EVENTHANDLER_INVOKE(shutdown_final, howto);
  368 
  369         for(;;) ;       /* safety against shutdown_reset not working */
  370         /* NOTREACHED */
  371 }
  372 
  373 /*
  374  * If the shutdown was a clean halt, behave accordingly.
  375  */
  376 static void
  377 shutdown_halt(void *junk, int howto)
  378 {
  379         if (howto & RB_HALT) {
  380                 printf("\n");
  381                 printf("The operating system has halted.\n");
  382                 printf("Please press any key to reboot.\n\n");
  383                 switch (cngetc()) {
  384                 case -1:                /* No console, just die */
  385                         cpu_halt();
  386                         /* NOTREACHED */
  387                 default:
  388                         howto &= ~RB_HALT;
  389                         break;
  390                 }
  391         }
  392 }
  393 
  394 /*
  395  * Check to see if the system paniced, pause and then reboot
  396  * according to the specified delay.
  397  */
  398 static void
  399 shutdown_panic(void *junk, int howto)
  400 {
  401         int loop;
  402 
  403         if (howto & RB_DUMP) {
  404                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  405                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  406                                 printf("Automatic reboot in %d seconds - "
  407                                        "press a key on the console to abort\n",
  408                                         PANIC_REBOOT_WAIT_TIME);
  409                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  410                                      loop > 0; --loop) {
  411                                         DELAY(1000 * 100); /* 1/10th second */
  412                                         /* Did user type a key? */
  413                                         if (cncheckc() != -1)
  414                                                 break;
  415                                 }
  416                                 if (!loop)
  417                                         return;
  418                         }
  419                 } else { /* zero time specified - reboot NOW */
  420                         return;
  421                 }
  422                 printf("--> Press a key on the console to reboot,\n");
  423                 printf("--> or switch off the system now.\n");
  424                 cngetc();
  425         }
  426 }
  427 
  428 /*
  429  * Everything done, now reset
  430  */
  431 static void
  432 shutdown_reset(void *junk, int howto)
  433 {
  434         printf("Rebooting...\n");
  435         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  436         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  437         cpu_reset();
  438         /* NOTREACHED */ /* assuming reset worked */
  439 }
  440 
  441 #ifdef SMP
  442 static u_int panic_cpu = NOCPU;
  443 #endif
  444 
  445 /*
  446  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  447  * and then reboots.  If we are called twice, then we avoid trying to sync
  448  * the disks as this often leads to recursive panics.
  449  *
  450  * MPSAFE
  451  */
  452 void
  453 panic(const char *fmt, ...)
  454 {
  455         struct thread *td = curthread;
  456         int bootopt, newpanic;
  457         va_list ap;
  458         static char buf[256];
  459 
  460 #ifdef SMP
  461         /*
  462          * We don't want multiple CPU's to panic at the same time, so we
  463          * use panic_cpu as a simple spinlock.  We have to keep checking
  464          * panic_cpu if we are spinning in case the panic on the first
  465          * CPU is canceled.
  466          */
  467         if (panic_cpu != PCPU_GET(cpuid))
  468                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  469                     PCPU_GET(cpuid)) == 0)
  470                         while (panic_cpu != NOCPU)
  471                                 ; /* nothing */
  472 #endif
  473 
  474         bootopt = RB_AUTOBOOT | RB_DUMP;
  475         newpanic = 0;
  476         if (panicstr)
  477                 bootopt |= RB_NOSYNC;
  478         else {
  479                 panicstr = fmt;
  480                 newpanic = 1;
  481         }
  482 
  483         va_start(ap, fmt);
  484         (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  485         if (panicstr == fmt)
  486                 panicstr = buf;
  487         va_end(ap);
  488         printf("panic: %s\n", buf);
  489 #ifdef SMP
  490         /* two separate prints in case of an unmapped page and trap */
  491         printf("cpuid = %d; ", PCPU_GET(cpuid));
  492 #ifdef APIC_IO
  493         printf("lapic.id = %08x\n", lapic.id);
  494 #else
  495         printf("\n");
  496 #endif
  497 #endif
  498 
  499 #if defined(DDB)
  500         if (newpanic && trace_on_panic)
  501                 db_print_backtrace();
  502         if (debugger_on_panic)
  503                 Debugger ("panic");
  504 #ifdef RESTARTABLE_PANICS
  505         /* See if the user aborted the panic, in which case we continue. */
  506         if (panicstr == NULL) {
  507 #ifdef SMP
  508                 atomic_store_rel_int(&panic_cpu, NOCPU);
  509 #endif
  510                 return;
  511         }
  512 #endif
  513 #endif
  514         td->td_flags |= TDF_INPANIC;
  515         if (!sync_on_panic)
  516                 bootopt |= RB_NOSYNC;
  517         boot(bootopt);
  518 }
  519 
  520 /*
  521  * Support for poweroff delay.
  522  */
  523 #ifndef POWEROFF_DELAY
  524 # define POWEROFF_DELAY 5000
  525 #endif
  526 static int poweroff_delay = POWEROFF_DELAY;
  527 
  528 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  529         &poweroff_delay, 0, "");
  530 
  531 static void 
  532 poweroff_wait(void *junk, int howto)
  533 {
  534         if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  535                 return;
  536         DELAY(poweroff_delay * 1000);
  537 }
  538 
  539 /*
  540  * Some system processes (e.g. syncer) need to be stopped at appropriate
  541  * points in their main loops prior to a system shutdown, so that they
  542  * won't interfere with the shutdown process (e.g. by holding a disk buf
  543  * to cause sync to fail).  For each of these system processes, register
  544  * shutdown_kproc() as a handler for one of shutdown events.
  545  */
  546 static int kproc_shutdown_wait = 60;
  547 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  548     &kproc_shutdown_wait, 0, "");
  549 
  550 void
  551 kproc_shutdown(void *arg, int howto)
  552 {
  553         struct proc *p;
  554         int error;
  555 
  556         if (panicstr)
  557                 return;
  558 
  559         p = (struct proc *)arg;
  560         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  561             kproc_shutdown_wait, p->p_comm);
  562         error = kthread_suspend(p, kproc_shutdown_wait * hz);
  563 
  564         if (error == EWOULDBLOCK)
  565                 printf("timed out\n");
  566         else
  567                 printf("stopped\n");
  568 }
  569 
  570 /* Registration of dumpers */
  571 int
  572 set_dumper(struct dumperinfo *di)
  573 {
  574         if (di == NULL) {
  575                 bzero(&dumper, sizeof dumper);
  576                 return (0);
  577         }
  578         if (dumper.dumper != NULL)
  579                 return (EBUSY);
  580         dumper = *di;
  581         return (0);
  582 }
  583 
  584 #if defined(__powerpc__)
  585 void
  586 dumpsys(struct dumperinfo *di __unused)
  587 {
  588 
  589         printf("Kernel dumps not implemented on this architecture\n");
  590 }
  591 #endif
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This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/kern/kern_shutdown.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_shutdown.c
