The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/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  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)kern_shutdown.c     8.3 (Berkeley) 1/21/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/6.0/sys/kern/kern_shutdown.c 151007 2005-10-06 17:53:46Z ups $");
   39 
   40 #include "opt_kdb.h"
   41 #include "opt_mac.h"
   42 #include "opt_panic.h"
   43 #include "opt_show_busybufs.h"
   44 #include "opt_sched.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/bio.h>
   49 #include <sys/buf.h>
   50 #include <sys/conf.h>
   51 #include <sys/cons.h>
   52 #include <sys/eventhandler.h>
   53 #include <sys/kdb.h>
   54 #include <sys/kernel.h>
   55 #include <sys/kthread.h>
   56 #include <sys/mac.h>
   57 #include <sys/malloc.h>
   58 #include <sys/mount.h>
   59 #include <sys/proc.h>
   60 #include <sys/reboot.h>
   61 #include <sys/resourcevar.h>
   62 #include <sys/sched.h>
   63 #include <sys/smp.h>            /* smp_active */
   64 #include <sys/sysctl.h>
   65 #include <sys/sysproto.h>
   66 
   67 #include <machine/cpu.h>
   68 #include <machine/pcb.h>
   69 #include <machine/smp.h>
   70 
   71 #include <sys/signalvar.h>
   72 
   73 #ifndef PANIC_REBOOT_WAIT_TIME
   74 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   75 #endif
   76 
   77 /*
   78  * Note that stdarg.h and the ANSI style va_start macro is used for both
   79  * ANSI and traditional C compilers.
   80  */
   81 #include <machine/stdarg.h>
   82 
   83 #ifdef KDB
   84 #ifdef KDB_UNATTENDED
   85 int debugger_on_panic = 0;
   86 #else
   87 int debugger_on_panic = 1;
   88 #endif
   89 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
   90         &debugger_on_panic, 0, "Run debugger on kernel panic");
   91 
   92 #ifdef KDB_TRACE
   93 int trace_on_panic = 1;
   94 #else
   95 int trace_on_panic = 0;
   96 #endif
   97 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
   98         &trace_on_panic, 0, "Print stack trace on kernel panic");
   99 #endif /* KDB */
  100 
  101 int sync_on_panic = 0;
  102 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  103         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  104 
  105 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  106 
  107 /*
  108  * Variable panicstr contains argument to first call to panic; used as flag
  109  * to indicate that the kernel has already called panic.
  110  */
  111 const char *panicstr;
  112 
  113 int dumping;                            /* system is dumping */
  114 static struct dumperinfo dumper;        /* our selected dumper */
  115 
  116 /* Context information for dump-debuggers. */
  117 static struct pcb dumppcb;              /* Registers. */
  118 static lwpid_t dumptid;                 /* Thread ID. */
  119 
  120 static void boot(int) __dead2;
  121 static void poweroff_wait(void *, int);
  122 static void shutdown_halt(void *junk, int howto);
  123 static void shutdown_panic(void *junk, int howto);
  124 static void shutdown_reset(void *junk, int howto);
  125 
  126 /* register various local shutdown events */
  127 static void
  128 shutdown_conf(void *unused)
  129 {
  130 
  131         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  132             SHUTDOWN_PRI_FIRST);
  133         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  134             SHUTDOWN_PRI_LAST + 100);
  135         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  136             SHUTDOWN_PRI_LAST + 100);
  137         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  138             SHUTDOWN_PRI_LAST + 200);
  139 }
  140 
  141 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
  142 
  143 /*
  144  * The system call that results in a reboot
  145  *
  146  * MPSAFE
  147  */
  148 /* ARGSUSED */
  149 int
  150 reboot(struct thread *td, struct reboot_args *uap)
  151 {
  152         int error;
  153 
  154         error = 0;
  155 #ifdef MAC
  156         error = mac_check_system_reboot(td->td_ucred, uap->opt);
  157 #endif
  158         if (error == 0)
  159                 error = suser(td);
  160         if (error == 0) {
  161                 mtx_lock(&Giant);
  162                 boot(uap->opt);
  163                 mtx_unlock(&Giant);
  164         }
  165         return (error);
  166 }
  167 
  168 /*
  169  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  170  */
  171 static int shutdown_howto = 0;
  172 
  173 void
  174 shutdown_nice(int howto)
  175 {
  176 
  177         shutdown_howto = howto;
  178 
  179         /* Send a signal to init(8) and have it shutdown the world */
  180         if (initproc != NULL) {
  181                 PROC_LOCK(initproc);
  182                 psignal(initproc, SIGINT);
  183                 PROC_UNLOCK(initproc);
  184         } else {
  185                 /* No init(8) running, so simply reboot */
  186                 boot(RB_NOSYNC);
  187         }
  188         return;
  189 }
  190 static int      waittime = -1;
  191 
  192 static void
  193 print_uptime(void)
  194 {
  195         int f;
  196         struct timespec ts;
  197 
  198         getnanouptime(&ts);
  199         printf("Uptime: ");
  200         f = 0;
  201         if (ts.tv_sec >= 86400) {
  202                 printf("%ldd", (long)ts.tv_sec / 86400);
  203                 ts.tv_sec %= 86400;
  204                 f = 1;
  205         }
  206         if (f || ts.tv_sec >= 3600) {
  207                 printf("%ldh", (long)ts.tv_sec / 3600);
  208                 ts.tv_sec %= 3600;
  209                 f = 1;
  210         }
  211         if (f || ts.tv_sec >= 60) {
  212                 printf("%ldm", (long)ts.tv_sec / 60);
  213                 ts.tv_sec %= 60;
  214                 f = 1;
  215         }
  216         printf("%lds\n", (long)ts.tv_sec);
  217 }
  218 
  219 static void
  220 doadump(void)
  221 {
  222 
  223         /*
  224          * Sometimes people have to call this from the kernel debugger. 
  225          * (if 'panic' can not dump)
  226          * Give them a clue as to why they can't dump.
  227          */
  228         if (dumper.dumper == NULL) {
  229                 printf("Cannot dump. No dump device defined.\n");
  230                 return;
  231         }
  232 
  233         savectx(&dumppcb);
  234         dumptid = curthread->td_tid;
  235         dumping++;
  236         dumpsys(&dumper);
  237 }
  238 
  239 static int
  240 isbufbusy(struct buf *bp)
  241 {
  242         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  243             BUF_REFCNT(bp) > 0) ||
  244             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  245                 return (1);
  246         return (0);
  247 }
  248 
  249 /*
  250  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  251  */
  252 static void
  253 boot(int howto)
  254 {
  255         static int first_buf_printf = 1;
  256 
  257 #if defined(SMP)
  258         /*
  259          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  260          * systems don't shutdown properly (i.e., ACPI power off) if we
  261          * run on another processor.
  262          */
  263         mtx_lock_spin(&sched_lock);
  264         sched_bind(curthread, 0);
  265         mtx_unlock_spin(&sched_lock);
  266         KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
  267 #endif
  268 
  269         /* collect extra flags that shutdown_nice might have set */
  270         howto |= shutdown_howto;
  271 
  272         /* We are out of the debugger now. */
  273         kdb_active = 0;
  274 
  275         /*
  276          * Do any callouts that should be done BEFORE syncing the filesystems.
  277          */
  278         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  279 
  280         /* 
  281          * Now sync filesystems
  282          */
  283         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  284                 register struct buf *bp;
  285                 int iter, nbusy, pbusy;
  286 #ifndef PREEMPTION
  287                 int subiter;
  288 #endif
  289 
  290                 waittime = 0;
  291 
  292                 sync(curthread, NULL);
  293 
  294                 /*
  295                  * With soft updates, some buffers that are
  296                  * written will be remarked as dirty until other
  297                  * buffers are written.
  298                  */
  299                 for (iter = pbusy = 0; iter < 20; iter++) {
  300                         nbusy = 0;
  301                         for (bp = &buf[nbuf]; --bp >= buf; )
  302                                 if (isbufbusy(bp))
  303                                         nbusy++;
  304                         if (nbusy == 0) {
  305                                 if (first_buf_printf)
  306                                         printf("All buffers synced.");
  307                                 break;
  308                         }
  309                         if (first_buf_printf) {
  310                                 printf("Syncing disks, buffers remaining... ");
  311                                 first_buf_printf = 0;
  312                         }
  313                         printf("%d ", nbusy);
  314                         if (nbusy < pbusy)
  315                                 iter = 0;
  316                         pbusy = nbusy;
  317                         sync(curthread, NULL);
  318 
  319 #ifdef PREEMPTION
  320                         /*
  321                          * Drop Giant and spin for a while to allow
  322                          * interrupt threads to run.
  323                          */
  324                         DROP_GIANT();
  325                         DELAY(50000 * iter);
  326                         PICKUP_GIANT();
  327 #else
  328                         /*
  329                          * Drop Giant and context switch several times to
  330                          * allow interrupt threads to run.
  331                          */
  332                         DROP_GIANT();
  333                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  334                                 mtx_lock_spin(&sched_lock);
  335                                 mi_switch(SW_VOL, NULL);
  336                                 mtx_unlock_spin(&sched_lock);
  337                                 DELAY(1000);
  338                         }
  339                         PICKUP_GIANT();
  340 #endif
  341                 }
  342                 printf("\n");
  343                 /*
  344                  * Count only busy local buffers to prevent forcing 
  345                  * a fsck if we're just a client of a wedged NFS server
  346                  */
  347                 nbusy = 0;
  348                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  349                         if (isbufbusy(bp)) {
  350 #if 0
  351 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  352                                 if (bp->b_dev == NULL) {
  353                                         TAILQ_REMOVE(&mountlist,
  354                                             bp->b_vp->v_mount, mnt_list);
  355                                         continue;
  356                                 }
  357 #endif
  358                                 nbusy++;
  359 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  360                                 printf(
  361                             "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
  362                                     nbusy, bp->b_bufobj,
  363                                     bp->b_flags, (long)bp->b_blkno,
  364                                     (long)bp->b_lblkno);
  365 #endif
  366                         }
  367                 }
  368                 if (nbusy) {
  369                         /*
  370                          * Failed to sync all blocks. Indicate this and don't
  371                          * unmount filesystems (thus forcing an fsck on reboot).
  372                          */
  373                         printf("Giving up on %d buffers\n", nbusy);
  374                         DELAY(5000000); /* 5 seconds */
  375                 } else {
  376                         if (!first_buf_printf)
  377                                 printf("Final sync complete\n");
  378                         /*
  379                          * Unmount filesystems
  380                          */
  381                         if (panicstr == 0)
  382                                 vfs_unmountall();
  383                 }
  384                 DELAY(100000);          /* wait for console output to finish */
  385         }
  386 
  387         print_uptime();
  388 
  389         /*
  390          * Ok, now do things that assume all filesystem activity has
  391          * been completed.
  392          */
  393         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  394 
  395         /* XXX This doesn't disable interrupts any more.  Reconsider? */
  396         splhigh();
  397 
  398         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  399                 doadump();
  400 
  401         /* Now that we're going to really halt the system... */
  402         EVENTHANDLER_INVOKE(shutdown_final, howto);
  403 
  404         for(;;) ;       /* safety against shutdown_reset not working */
  405         /* NOTREACHED */
  406 }
  407 
  408 /*
  409  * If the shutdown was a clean halt, behave accordingly.
  410  */
  411 static void
  412 shutdown_halt(void *junk, int howto)
  413 {
  414 
  415         if (howto & RB_HALT) {
  416                 printf("\n");
  417                 printf("The operating system has halted.\n");
  418                 printf("Please press any key to reboot.\n\n");
  419                 switch (cngetc()) {
  420                 case -1:                /* No console, just die */
  421                         cpu_halt();
  422                         /* NOTREACHED */
  423                 default:
  424                         howto &= ~RB_HALT;
  425                         break;
  426                 }
  427         }
  428 }
  429 
  430 /*
  431  * Check to see if the system paniced, pause and then reboot
  432  * according to the specified delay.
  433  */
  434 static void
  435 shutdown_panic(void *junk, int howto)
  436 {
  437         int loop;
  438 
  439         if (howto & RB_DUMP) {
  440                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  441                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  442                                 printf("Automatic reboot in %d seconds - "
  443                                        "press a key on the console to abort\n",
  444                                         PANIC_REBOOT_WAIT_TIME);
  445                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  446                                      loop > 0; --loop) {
  447                                         DELAY(1000 * 100); /* 1/10th second */
  448                                         /* Did user type a key? */
  449                                         if (cncheckc() != -1)
  450                                                 break;
  451                                 }
  452                                 if (!loop)
  453                                         return;
  454                         }
  455                 } else { /* zero time specified - reboot NOW */
  456                         return;
  457                 }
  458                 printf("--> Press a key on the console to reboot,\n");
  459                 printf("--> or switch off the system now.\n");
  460                 cngetc();
  461         }
  462 }
  463 
  464 /*
  465  * Everything done, now reset
  466  */
  467 static void
  468 shutdown_reset(void *junk, int howto)
  469 {
  470 
  471         printf("Rebooting...\n");
  472         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  473         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  474         cpu_reset();
  475         /* NOTREACHED */ /* assuming reset worked */
  476 }
  477 
  478 #ifdef SMP
  479 static u_int panic_cpu = NOCPU;
  480 #endif
  481 
  482 /*
  483  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  484  * and then reboots.  If we are called twice, then we avoid trying to sync
  485  * the disks as this often leads to recursive panics.
  486  *
  487  * MPSAFE
  488  */
  489 void
  490 panic(const char *fmt, ...)
  491 {
  492         struct thread *td = curthread;
  493         int bootopt, newpanic;
  494         va_list ap;
  495         static char buf[256];
  496 
  497 #ifdef SMP
  498         /*
  499          * We don't want multiple CPU's to panic at the same time, so we
  500          * use panic_cpu as a simple spinlock.  We have to keep checking
  501          * panic_cpu if we are spinning in case the panic on the first
  502          * CPU is canceled.
  503          */
  504         if (panic_cpu != PCPU_GET(cpuid))
  505                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  506                     PCPU_GET(cpuid)) == 0)
  507                         while (panic_cpu != NOCPU)
  508                                 ; /* nothing */
  509 #endif
  510 
  511         bootopt = RB_AUTOBOOT | RB_DUMP;
  512         newpanic = 0;
  513         if (panicstr)
  514                 bootopt |= RB_NOSYNC;
  515         else {
  516                 panicstr = fmt;
  517                 newpanic = 1;
  518         }
  519 
  520         va_start(ap, fmt);
  521         if (newpanic) {
  522                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  523                 panicstr = buf;
  524                 printf("panic: %s\n", buf);
  525         } else {
  526                 printf("panic: ");
  527                 vprintf(fmt, ap);
  528                 printf("\n");
  529         }
  530         va_end(ap);
  531 #ifdef SMP
  532         printf("cpuid = %d\n", PCPU_GET(cpuid));
  533 #endif
  534 
  535 #ifdef KDB
  536         if (newpanic && trace_on_panic)
  537                 kdb_backtrace();
  538         if (debugger_on_panic)
  539                 kdb_enter("panic");
  540 #ifdef RESTARTABLE_PANICS
  541         /* See if the user aborted the panic, in which case we continue. */
  542         if (panicstr == NULL) {
  543 #ifdef SMP
  544                 atomic_store_rel_int(&panic_cpu, NOCPU);
  545 #endif
  546                 return;
  547         }
  548 #endif
  549 #endif
  550         mtx_lock_spin(&sched_lock);
  551         td->td_flags |= TDF_INPANIC;
  552         mtx_unlock_spin(&sched_lock);
  553         if (!sync_on_panic)
  554                 bootopt |= RB_NOSYNC;
  555         boot(bootopt);
  556 }
  557 
  558 /*
  559  * Support for poweroff delay.
  560  */
  561 #ifndef POWEROFF_DELAY
  562 # define POWEROFF_DELAY 5000
  563 #endif
  564 static int poweroff_delay = POWEROFF_DELAY;
  565 
  566 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  567         &poweroff_delay, 0, "");
  568 
  569 static void
  570 poweroff_wait(void *junk, int howto)
  571 {
  572 
  573         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  574                 return;
  575         DELAY(poweroff_delay * 1000);
  576 }
  577 
  578 /*
  579  * Some system processes (e.g. syncer) need to be stopped at appropriate
  580  * points in their main loops prior to a system shutdown, so that they
  581  * won't interfere with the shutdown process (e.g. by holding a disk buf
  582  * to cause sync to fail).  For each of these system processes, register
  583  * shutdown_kproc() as a handler for one of shutdown events.
  584  */
  585 static int kproc_shutdown_wait = 60;
  586 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  587     &kproc_shutdown_wait, 0, "");
  588 
  589 void
  590 kproc_shutdown(void *arg, int howto)
  591 {
  592         struct proc *p;
  593         char procname[MAXCOMLEN + 1];
  594         int error;
  595 
  596         if (panicstr)
  597                 return;
  598 
  599         p = (struct proc *)arg;
  600         strlcpy(procname, p->p_comm, sizeof(procname));
  601         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  602             kproc_shutdown_wait, procname);
  603         error = kthread_suspend(p, kproc_shutdown_wait * hz);
  604 
  605         if (error == EWOULDBLOCK)
  606                 printf("timed out\n");
  607         else
  608                 printf("done\n");
  609 }
  610 
  611 /* Registration of dumpers */
  612 int
  613 set_dumper(struct dumperinfo *di)
  614 {
  615 
  616         if (di == NULL) {
  617                 bzero(&dumper, sizeof dumper);
  618                 return (0);
  619         }
  620         if (dumper.dumper != NULL)
  621                 return (EBUSY);
  622         dumper = *di;
  623         return (0);
  624 }
  625 
  626 #if defined(__powerpc__)
  627 void
  628 dumpsys(struct dumperinfo *di __unused)
  629 {
  630 
  631         printf("Kernel dumps not implemented on this architecture\n");
  632 }
  633 #endif

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