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("$FreeBSD$");
   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 <vm/vm.h>
   72 #include <vm/vm_object.h>
   73 #include <vm/vm_page.h>
   74 #include <vm/vm_pager.h>
   75 #include <vm/swap_pager.h>
   76 
   77 #include <sys/signalvar.h>
   78 
   79 #ifndef PANIC_REBOOT_WAIT_TIME
   80 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   81 #endif
   82 
   83 /*
   84  * Note that stdarg.h and the ANSI style va_start macro is used for both
   85  * ANSI and traditional C compilers.
   86  */
   87 #include <machine/stdarg.h>
   88 
   89 #ifdef KDB
   90 #ifdef KDB_UNATTENDED
   91 int debugger_on_panic = 0;
   92 #else
   93 int debugger_on_panic = 1;
   94 #endif
   95 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
   96         &debugger_on_panic, 0, "Run debugger on kernel panic");
   97 
   98 #ifdef KDB_TRACE
   99 int trace_on_panic = 1;
  100 #else
  101 int trace_on_panic = 0;
  102 #endif
  103 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
  104         &trace_on_panic, 0, "Print stack trace on kernel panic");
  105 #endif /* KDB */
  106 
  107 int sync_on_panic = 0;
  108 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  109         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  110 
  111 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  112 
  113 /*
  114  * Variable panicstr contains argument to first call to panic; used as flag
  115  * to indicate that the kernel has already called panic.
  116  */
  117 const char *panicstr;
  118 
  119 int dumping;                            /* system is dumping */
  120 int rebooting;                          /* system is rebooting */
  121 static struct dumperinfo dumper;        /* our selected dumper */
  122 
  123 /* Context information for dump-debuggers. */
  124 static struct pcb dumppcb;              /* Registers. */
  125 static lwpid_t dumptid;                 /* Thread ID. */
  126 
  127 static void boot(int) __dead2;
  128 static void poweroff_wait(void *, int);
  129 static void shutdown_halt(void *junk, int howto);
  130 static void shutdown_panic(void *junk, int howto);
  131 static void shutdown_reset(void *junk, int howto);
  132 
  133 /* register various local shutdown events */
  134 static void
  135 shutdown_conf(void *unused)
  136 {
  137 
  138         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  139             SHUTDOWN_PRI_FIRST);
  140         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  141             SHUTDOWN_PRI_LAST + 100);
  142         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  143             SHUTDOWN_PRI_LAST + 100);
  144         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  145             SHUTDOWN_PRI_LAST + 200);
  146 }
  147 
  148 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
  149 
  150 /*
  151  * The system call that results in a reboot
  152  *
  153  * MPSAFE
  154  */
  155 /* ARGSUSED */
  156 int
  157 reboot(struct thread *td, struct reboot_args *uap)
  158 {
  159         int error;
  160 
  161         error = 0;
  162 #ifdef MAC
  163         error = mac_check_system_reboot(td->td_ucred, uap->opt);
  164 #endif
  165         if (error == 0)
  166                 error = suser(td);
  167         if (error == 0) {
  168                 mtx_lock(&Giant);
  169                 boot(uap->opt);
  170                 mtx_unlock(&Giant);
  171         }
  172         return (error);
  173 }
  174 
  175 /*
  176  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  177  */
  178 static int shutdown_howto = 0;
  179 
  180 void
  181 shutdown_nice(int howto)
  182 {
  183 
  184         shutdown_howto = howto;
  185 
  186         /* Send a signal to init(8) and have it shutdown the world */
  187         if (initproc != NULL) {
  188                 PROC_LOCK(initproc);
  189                 psignal(initproc, SIGINT);
  190                 PROC_UNLOCK(initproc);
  191         } else {
  192                 /* No init(8) running, so simply reboot */
  193                 boot(RB_NOSYNC);
  194         }
  195         return;
  196 }
  197 static int      waittime = -1;
  198 
  199 static void
  200 print_uptime(void)
  201 {
  202         int f;
  203         struct timespec ts;
  204 
  205         getnanouptime(&ts);
  206         printf("Uptime: ");
  207         f = 0;
  208         if (ts.tv_sec >= 86400) {
  209                 printf("%ldd", (long)ts.tv_sec / 86400);
  210                 ts.tv_sec %= 86400;
  211                 f = 1;
  212         }
  213         if (f || ts.tv_sec >= 3600) {
  214                 printf("%ldh", (long)ts.tv_sec / 3600);
  215                 ts.tv_sec %= 3600;
  216                 f = 1;
  217         }
  218         if (f || ts.tv_sec >= 60) {
  219                 printf("%ldm", (long)ts.tv_sec / 60);
  220                 ts.tv_sec %= 60;
  221                 f = 1;
  222         }
  223         printf("%lds\n", (long)ts.tv_sec);
  224 }
  225 
  226 static void
  227 doadump(void)
  228 {
  229 
  230         /*
  231          * Sometimes people have to call this from the kernel debugger. 
  232          * (if 'panic' can not dump)
  233          * Give them a clue as to why they can't dump.
  234          */
  235         if (dumper.dumper == NULL) {
  236                 printf("Cannot dump. No dump device defined.\n");
  237                 return;
  238         }
  239 
  240         savectx(&dumppcb);
  241         dumptid = curthread->td_tid;
  242         dumping++;
  243         dumpsys(&dumper);
  244         dumping--;
  245 }
  246 
  247 static int
  248 isbufbusy(struct buf *bp)
  249 {
  250         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  251             BUF_REFCNT(bp) > 0) ||
  252             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  253                 return (1);
  254         return (0);
  255 }
  256 
  257 /*
  258  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  259  */
  260 static void
  261 boot(int howto)
  262 {
  263         static int first_buf_printf = 1;
  264 
  265 #if defined(SMP)
  266         /*
  267          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  268          * systems don't shutdown properly (i.e., ACPI power off) if we
  269          * run on another processor.
  270          */
  271         mtx_lock_spin(&sched_lock);
  272         sched_bind(curthread, 0);
  273         mtx_unlock_spin(&sched_lock);
  274         KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
  275 #endif
  276         /* We're in the process of rebooting. */
  277         rebooting = 1;
  278 
  279         /* collect extra flags that shutdown_nice might have set */
  280         howto |= shutdown_howto;
  281 
  282         /* We are out of the debugger now. */
  283         kdb_active = 0;
  284 
  285         /*
  286          * Do any callouts that should be done BEFORE syncing the filesystems.
  287          */
  288         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  289 
  290         /* 
  291          * Now sync filesystems
  292          */
  293         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  294                 register struct buf *bp;
  295                 int iter, nbusy, pbusy;
  296 #ifndef PREEMPTION
  297                 int subiter;
  298 #endif
  299 
  300                 waittime = 0;
  301 
  302                 sync(curthread, NULL);
  303 
  304                 /*
  305                  * With soft updates, some buffers that are
  306                  * written will be remarked as dirty until other
  307                  * buffers are written.
  308                  */
  309                 for (iter = pbusy = 0; iter < 20; iter++) {
  310                         nbusy = 0;
  311                         for (bp = &buf[nbuf]; --bp >= buf; )
  312                                 if (isbufbusy(bp))
  313                                         nbusy++;
  314                         if (nbusy == 0) {
  315                                 if (first_buf_printf)
  316                                         printf("All buffers synced.");
  317                                 break;
  318                         }
  319                         if (first_buf_printf) {
  320                                 printf("Syncing disks, buffers remaining... ");
  321                                 first_buf_printf = 0;
  322                         }
  323                         printf("%d ", nbusy);
  324                         if (nbusy < pbusy)
  325                                 iter = 0;
  326                         pbusy = nbusy;
  327                         sync(curthread, NULL);
  328 
  329 #ifdef PREEMPTION
  330                         /*
  331                          * Drop Giant and spin for a while to allow
  332                          * interrupt threads to run.
  333                          */
  334                         DROP_GIANT();
  335                         DELAY(50000 * iter);
  336                         PICKUP_GIANT();
  337 #else
  338                         /*
  339                          * Drop Giant and context switch several times to
  340                          * allow interrupt threads to run.
  341                          */
  342                         DROP_GIANT();
  343                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  344                                 mtx_lock_spin(&sched_lock);
  345                                 mi_switch(SW_VOL, NULL);
  346                                 mtx_unlock_spin(&sched_lock);
  347                                 DELAY(1000);
  348                         }
  349                         PICKUP_GIANT();
  350 #endif
  351                 }
  352                 printf("\n");
  353                 /*
  354                  * Count only busy local buffers to prevent forcing 
  355                  * a fsck if we're just a client of a wedged NFS server
  356                  */
  357                 nbusy = 0;
  358                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  359                         if (isbufbusy(bp)) {
  360 #if 0
  361 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  362                                 if (bp->b_dev == NULL) {
  363                                         TAILQ_REMOVE(&mountlist,
  364                                             bp->b_vp->v_mount, mnt_list);
  365                                         continue;
  366                                 }
  367 #endif
  368                                 nbusy++;
  369 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  370                                 printf(
  371                             "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
  372                                     nbusy, bp->b_bufobj,
  373                                     bp->b_flags, (long)bp->b_blkno,
  374                                     (long)bp->b_lblkno);
  375 #endif
  376                         }
  377                 }
  378                 if (nbusy) {
  379                         /*
  380                          * Failed to sync all blocks. Indicate this and don't
  381                          * unmount filesystems (thus forcing an fsck on reboot).
  382                          */
  383                         printf("Giving up on %d buffers\n", nbusy);
  384                         DELAY(5000000); /* 5 seconds */
  385                 } else {
  386                         if (!first_buf_printf)
  387                                 printf("Final sync complete\n");
  388                         /*
  389                          * Unmount filesystems
  390                          */
  391                         if (panicstr == 0)
  392                                 vfs_unmountall();
  393                 }
  394                 swapoff_all();
  395                 DELAY(100000);          /* wait for console output to finish */
  396         }
  397 
  398         print_uptime();
  399 
  400         /*
  401          * Ok, now do things that assume all filesystem activity has
  402          * been completed.
  403          */
  404         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  405 
  406         /* XXX This doesn't disable interrupts any more.  Reconsider? */
  407         splhigh();
  408 
  409         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  410                 doadump();
  411 
  412         /* Now that we're going to really halt the system... */
  413         EVENTHANDLER_INVOKE(shutdown_final, howto);
  414 
  415         for(;;) ;       /* safety against shutdown_reset not working */
  416         /* NOTREACHED */
  417 }
  418 
  419 /*
  420  * If the shutdown was a clean halt, behave accordingly.
  421  */
  422 static void
  423 shutdown_halt(void *junk, int howto)
  424 {
  425 
  426         if (howto & RB_HALT) {
  427                 printf("\n");
  428                 printf("The operating system has halted.\n");
  429                 printf("Please press any key to reboot.\n\n");
  430                 switch (cngetc()) {
  431                 case -1:                /* No console, just die */
  432                         cpu_halt();
  433                         /* NOTREACHED */
  434                 default:
  435                         howto &= ~RB_HALT;
  436                         break;
  437                 }
  438         }
  439 }
  440 
  441 /*
  442  * Check to see if the system paniced, pause and then reboot
  443  * according to the specified delay.
  444  */
  445 static void
  446 shutdown_panic(void *junk, int howto)
  447 {
  448         int loop;
  449 
  450         if (howto & RB_DUMP) {
  451                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  452                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  453                                 printf("Automatic reboot in %d seconds - "
  454                                        "press a key on the console to abort\n",
  455                                         PANIC_REBOOT_WAIT_TIME);
  456                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  457                                      loop > 0; --loop) {
  458                                         DELAY(1000 * 100); /* 1/10th second */
  459                                         /* Did user type a key? */
  460                                         if (cncheckc() != -1)
  461                                                 break;
  462                                 }
  463                                 if (!loop)
  464                                         return;
  465                         }
  466                 } else { /* zero time specified - reboot NOW */
  467                         return;
  468                 }
  469                 printf("--> Press a key on the console to reboot,\n");
  470                 printf("--> or switch off the system now.\n");
  471                 cngetc();
  472         }
  473 }
  474 
  475 /*
  476  * Everything done, now reset
  477  */
  478 static void
  479 shutdown_reset(void *junk, int howto)
  480 {
  481 
  482         printf("Rebooting...\n");
  483         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  484         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  485         cpu_reset();
  486         /* NOTREACHED */ /* assuming reset worked */
  487 }
  488 
  489 #ifdef SMP
  490 static u_int panic_cpu = NOCPU;
  491 #endif
  492 
  493 /*
  494  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  495  * and then reboots.  If we are called twice, then we avoid trying to sync
  496  * the disks as this often leads to recursive panics.
  497  *
  498  * MPSAFE
  499  */
  500 void
  501 panic(const char *fmt, ...)
  502 {
  503         struct thread *td = curthread;
  504         int bootopt, newpanic;
  505         va_list ap;
  506         static char buf[256];
  507 
  508 #ifdef SMP
  509         /*
  510          * We don't want multiple CPU's to panic at the same time, so we
  511          * use panic_cpu as a simple spinlock.  We have to keep checking
  512          * panic_cpu if we are spinning in case the panic on the first
  513          * CPU is canceled.
  514          */
  515         if (panic_cpu != PCPU_GET(cpuid))
  516                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  517                     PCPU_GET(cpuid)) == 0)
  518                         while (panic_cpu != NOCPU)
  519                                 ; /* nothing */
  520 #endif
  521 
  522         bootopt = RB_AUTOBOOT | RB_DUMP;
  523         newpanic = 0;
  524         if (panicstr)
  525                 bootopt |= RB_NOSYNC;
  526         else {
  527                 panicstr = fmt;
  528                 newpanic = 1;
  529         }
  530 
  531         va_start(ap, fmt);
  532         if (newpanic) {
  533                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  534                 panicstr = buf;
  535                 printf("panic: %s\n", buf);
  536         } else {
  537                 printf("panic: ");
  538                 vprintf(fmt, ap);
  539                 printf("\n");
  540         }
  541         va_end(ap);
  542 #ifdef SMP
  543         printf("cpuid = %d\n", PCPU_GET(cpuid));
  544 #endif
  545 
  546 #ifdef KDB
  547         if (newpanic && trace_on_panic)
  548                 kdb_backtrace();
  549         if (debugger_on_panic)
  550                 kdb_enter("panic");
  551 #ifdef RESTARTABLE_PANICS
  552         /* See if the user aborted the panic, in which case we continue. */
  553         if (panicstr == NULL) {
  554 #ifdef SMP
  555                 atomic_store_rel_int(&panic_cpu, NOCPU);
  556 #endif
  557                 return;
  558         }
  559 #endif
  560 #endif
  561         mtx_lock_spin(&sched_lock);
  562         td->td_flags |= TDF_INPANIC;
  563         mtx_unlock_spin(&sched_lock);
  564         if (!sync_on_panic)
  565                 bootopt |= RB_NOSYNC;
  566         boot(bootopt);
  567 }
  568 
  569 /*
  570  * Support for poweroff delay.
  571  */
  572 #ifndef POWEROFF_DELAY
  573 # define POWEROFF_DELAY 5000
  574 #endif
  575 static int poweroff_delay = POWEROFF_DELAY;
  576 
  577 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  578         &poweroff_delay, 0, "");
  579 
  580 static void
  581 poweroff_wait(void *junk, int howto)
  582 {
  583 
  584         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  585                 return;
  586         DELAY(poweroff_delay * 1000);
  587 }
  588 
  589 /*
  590  * Some system processes (e.g. syncer) need to be stopped at appropriate
  591  * points in their main loops prior to a system shutdown, so that they
  592  * won't interfere with the shutdown process (e.g. by holding a disk buf
  593  * to cause sync to fail).  For each of these system processes, register
  594  * shutdown_kproc() as a handler for one of shutdown events.
  595  */
  596 static int kproc_shutdown_wait = 60;
  597 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  598     &kproc_shutdown_wait, 0, "");
  599 
  600 void
  601 kproc_shutdown(void *arg, int howto)
  602 {
  603         struct proc *p;
  604         char procname[MAXCOMLEN + 1];
  605         int error;
  606 
  607         if (panicstr)
  608                 return;
  609 
  610         p = (struct proc *)arg;
  611         strlcpy(procname, p->p_comm, sizeof(procname));
  612         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  613             kproc_shutdown_wait, procname);
  614         error = kthread_suspend(p, kproc_shutdown_wait * hz);
  615 
  616         if (error == EWOULDBLOCK)
  617                 printf("timed out\n");
  618         else
  619                 printf("done\n");
  620 }
  621 
  622 /* Registration of dumpers */
  623 int
  624 set_dumper(struct dumperinfo *di)
  625 {
  626 
  627         if (di == NULL) {
  628                 bzero(&dumper, sizeof dumper);
  629                 return (0);
  630         }
  631         if (dumper.dumper != NULL)
  632                 return (EBUSY);
  633         dumper = *di;
  634         return (0);
  635 }
  636 
  637 #if defined(__powerpc__)
  638 void
  639 dumpsys(struct dumperinfo *di __unused)
  640 {
  641 
  642         printf("Kernel dumps not implemented on this architecture\n");
  643 }
  644 #endif

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