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_ddb.h"
   41 #include "opt_kdb.h"
   42 #include "opt_panic.h"
   43 #include "opt_sched.h"
   44 #include "opt_watchdog.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/jail.h>
   54 #include <sys/kdb.h>
   55 #include <sys/kernel.h>
   56 #include <sys/kerneldump.h>
   57 #include <sys/kthread.h>
   58 #include <sys/malloc.h>
   59 #include <sys/mount.h>
   60 #include <sys/priv.h>
   61 #include <sys/proc.h>
   62 #include <sys/reboot.h>
   63 #include <sys/resourcevar.h>
   64 #include <sys/sched.h>
   65 #include <sys/smp.h>
   66 #include <sys/sysctl.h>
   67 #include <sys/sysproto.h>
   68 #include <sys/vnode.h>
   69 #include <sys/watchdog.h>
   70 
   71 #include <ddb/ddb.h>
   72 
   73 #include <machine/cpu.h>
   74 #include <machine/pcb.h>
   75 #include <machine/smp.h>
   76 
   77 #include <security/mac/mac_framework.h>
   78 
   79 #include <vm/vm.h>
   80 #include <vm/vm_object.h>
   81 #include <vm/vm_page.h>
   82 #include <vm/vm_pager.h>
   83 #include <vm/swap_pager.h>
   84 
   85 #include <sys/signalvar.h>
   86 
   87 #ifndef PANIC_REBOOT_WAIT_TIME
   88 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   89 #endif
   90 
   91 /*
   92  * Note that stdarg.h and the ANSI style va_start macro is used for both
   93  * ANSI and traditional C compilers.
   94  */
   95 #include <machine/stdarg.h>
   96 
   97 #ifdef KDB
   98 #ifdef KDB_UNATTENDED
   99 int debugger_on_panic = 0;
  100 #else
  101 int debugger_on_panic = 1;
  102 #endif
  103 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  104         &debugger_on_panic, 0, "Run debugger on kernel panic");
  105 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
  106 
  107 #ifdef KDB_TRACE
  108 static int trace_on_panic = 1;
  109 #else
  110 static int trace_on_panic = 0;
  111 #endif
  112 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  113         &trace_on_panic, 0, "Print stack trace on kernel panic");
  114 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic);
  115 #endif /* KDB */
  116 
  117 static int sync_on_panic = 0;
  118 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  119         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  120 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic);
  121 
  122 static int stop_scheduler_on_panic = 0;
  123 SYSCTL_INT(_kern, OID_AUTO, stop_scheduler_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  124     &stop_scheduler_on_panic, 0, "stop scheduler upon entering panic");
  125 TUNABLE_INT("kern.stop_scheduler_on_panic", &stop_scheduler_on_panic);
  126 
  127 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  128 
  129 #ifndef DIAGNOSTIC
  130 static int show_busybufs;
  131 #else
  132 static int show_busybufs = 1;
  133 #endif
  134 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
  135         &show_busybufs, 0, "");
  136 
  137 /*
  138  * Variable panicstr contains argument to first call to panic; used as flag
  139  * to indicate that the kernel has already called panic.
  140  */
  141 const char *panicstr;
  142 
  143 int dumping;                            /* system is dumping */
  144 int rebooting;                          /* system is rebooting */
  145 static struct dumperinfo dumper;        /* our selected dumper */
  146 
  147 /* Context information for dump-debuggers. */
  148 static struct pcb dumppcb;              /* Registers. */
  149 lwpid_t dumptid;                        /* Thread ID. */
  150 
  151 static void boot(int) __dead2;
  152 static void poweroff_wait(void *, int);
  153 static void shutdown_halt(void *junk, int howto);
  154 static void shutdown_panic(void *junk, int howto);
  155 static void shutdown_reset(void *junk, int howto);
  156 
  157 /* register various local shutdown events */
  158 static void
  159 shutdown_conf(void *unused)
  160 {
  161 
  162         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  163             SHUTDOWN_PRI_FIRST);
  164         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  165             SHUTDOWN_PRI_LAST + 100);
  166         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  167             SHUTDOWN_PRI_LAST + 100);
  168         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  169             SHUTDOWN_PRI_LAST + 200);
  170 }
  171 
  172 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
  173 
  174 /*
  175  * The system call that results in a reboot.
  176  */
  177 /* ARGSUSED */
  178 int
  179 reboot(struct thread *td, struct reboot_args *uap)
  180 {
  181         int error;
  182 
  183         error = 0;
  184 #ifdef MAC
  185         error = mac_system_check_reboot(td->td_ucred, uap->opt);
  186 #endif
  187         if (error == 0)
  188                 error = priv_check(td, PRIV_REBOOT);
  189         if (error == 0) {
  190                 mtx_lock(&Giant);
  191                 boot(uap->opt);
  192                 mtx_unlock(&Giant);
  193         }
  194         return (error);
  195 }
  196 
  197 /*
  198  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  199  */
  200 static int shutdown_howto = 0;
  201 
  202 void
  203 shutdown_nice(int howto)
  204 {
  205 
  206         shutdown_howto = howto;
  207 
  208         /* Send a signal to init(8) and have it shutdown the world */
  209         if (initproc != NULL) {
  210                 PROC_LOCK(initproc);
  211                 psignal(initproc, SIGINT);
  212                 PROC_UNLOCK(initproc);
  213         } else {
  214                 /* No init(8) running, so simply reboot */
  215                 boot(RB_NOSYNC);
  216         }
  217         return;
  218 }
  219 static int      waittime = -1;
  220 
  221 static void
  222 print_uptime(void)
  223 {
  224         int f;
  225         struct timespec ts;
  226 
  227         getnanouptime(&ts);
  228         printf("Uptime: ");
  229         f = 0;
  230         if (ts.tv_sec >= 86400) {
  231                 printf("%ldd", (long)ts.tv_sec / 86400);
  232                 ts.tv_sec %= 86400;
  233                 f = 1;
  234         }
  235         if (f || ts.tv_sec >= 3600) {
  236                 printf("%ldh", (long)ts.tv_sec / 3600);
  237                 ts.tv_sec %= 3600;
  238                 f = 1;
  239         }
  240         if (f || ts.tv_sec >= 60) {
  241                 printf("%ldm", (long)ts.tv_sec / 60);
  242                 ts.tv_sec %= 60;
  243                 f = 1;
  244         }
  245         printf("%lds\n", (long)ts.tv_sec);
  246 }
  247 
  248 static void
  249 doadump(void)
  250 {
  251 
  252         /*
  253          * Sometimes people have to call this from the kernel debugger. 
  254          * (if 'panic' can not dump)
  255          * Give them a clue as to why they can't dump.
  256          */
  257         if (dumper.dumper == NULL) {
  258                 printf("Cannot dump. Device not defined or unavailable.\n");
  259                 return;
  260         }
  261 
  262         savectx(&dumppcb);
  263         dumptid = curthread->td_tid;
  264         dumping++;
  265 #ifdef DDB
  266         if (textdump_pending)
  267                 textdump_dumpsys(&dumper);
  268         else
  269 #endif
  270                 dumpsys(&dumper);
  271         dumping--;
  272 }
  273 
  274 static int
  275 isbufbusy(struct buf *bp)
  276 {
  277         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  278             BUF_ISLOCKED(bp)) ||
  279             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  280                 return (1);
  281         return (0);
  282 }
  283 
  284 /*
  285  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  286  */
  287 static void
  288 boot(int howto)
  289 {
  290         static int first_buf_printf = 1;
  291 
  292 #if defined(SMP)
  293         /*
  294          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  295          * systems don't shutdown properly (i.e., ACPI power off) if we
  296          * run on another processor.
  297          */
  298         if (!SCHEDULER_STOPPED()) {
  299                 thread_lock(curthread);
  300                 sched_bind(curthread, 0);
  301                 thread_unlock(curthread);
  302                 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
  303         }
  304 #endif
  305         /* We're in the process of rebooting. */
  306         rebooting = 1;
  307 
  308         /* collect extra flags that shutdown_nice might have set */
  309         howto |= shutdown_howto;
  310 
  311         /* We are out of the debugger now. */
  312         kdb_active = 0;
  313 
  314         /*
  315          * Do any callouts that should be done BEFORE syncing the filesystems.
  316          */
  317         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  318 
  319         /* 
  320          * Now sync filesystems
  321          */
  322         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  323                 register struct buf *bp;
  324                 int iter, nbusy, pbusy;
  325 #ifndef PREEMPTION
  326                 int subiter;
  327 #endif
  328 
  329                 waittime = 0;
  330 
  331                 wdog_kern_pat(WD_LASTVAL);
  332                 sync(curthread, NULL);
  333 
  334                 /*
  335                  * With soft updates, some buffers that are
  336                  * written will be remarked as dirty until other
  337                  * buffers are written.
  338                  */
  339                 for (iter = pbusy = 0; iter < 20; iter++) {
  340                         nbusy = 0;
  341                         for (bp = &buf[nbuf]; --bp >= buf; )
  342                                 if (isbufbusy(bp))
  343                                         nbusy++;
  344                         if (nbusy == 0) {
  345                                 if (first_buf_printf)
  346                                         printf("All buffers synced.");
  347                                 break;
  348                         }
  349                         if (first_buf_printf) {
  350                                 printf("Syncing disks, buffers remaining... ");
  351                                 first_buf_printf = 0;
  352                         }
  353                         printf("%d ", nbusy);
  354                         if (nbusy < pbusy)
  355                                 iter = 0;
  356                         pbusy = nbusy;
  357 
  358                         wdog_kern_pat(WD_LASTVAL);
  359                         sync(curthread, NULL);
  360 
  361 #ifdef PREEMPTION
  362                         /*
  363                          * Drop Giant and spin for a while to allow
  364                          * interrupt threads to run.
  365                          */
  366                         DROP_GIANT();
  367                         DELAY(50000 * iter);
  368                         PICKUP_GIANT();
  369 #else
  370                         /*
  371                          * Drop Giant and context switch several times to
  372                          * allow interrupt threads to run.
  373                          */
  374                         DROP_GIANT();
  375                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  376                                 thread_lock(curthread);
  377                                 mi_switch(SW_VOL, NULL);
  378                                 thread_unlock(curthread);
  379                                 DELAY(1000);
  380                         }
  381                         PICKUP_GIANT();
  382 #endif
  383                 }
  384                 printf("\n");
  385                 /*
  386                  * Count only busy local buffers to prevent forcing 
  387                  * a fsck if we're just a client of a wedged NFS server
  388                  */
  389                 nbusy = 0;
  390                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  391                         if (isbufbusy(bp)) {
  392 #if 0
  393 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  394                                 if (bp->b_dev == NULL) {
  395                                         TAILQ_REMOVE(&mountlist,
  396                                             bp->b_vp->v_mount, mnt_list);
  397                                         continue;
  398                                 }
  399 #endif
  400                                 nbusy++;
  401                                 if (show_busybufs > 0) {
  402                                         printf(
  403             "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:",
  404                                             nbusy, bp, bp->b_vp, bp->b_flags,
  405                                             (intmax_t)bp->b_blkno,
  406                                             (intmax_t)bp->b_lblkno);
  407                                         BUF_LOCKPRINTINFO(bp);
  408                                         if (show_busybufs > 1)
  409                                                 vn_printf(bp->b_vp,
  410                                                     "vnode content: ");
  411                                 }
  412                         }
  413                 }
  414                 if (nbusy) {
  415                         /*
  416                          * Failed to sync all blocks. Indicate this and don't
  417                          * unmount filesystems (thus forcing an fsck on reboot).
  418                          */
  419                         printf("Giving up on %d buffers\n", nbusy);
  420                         DELAY(5000000); /* 5 seconds */
  421                 } else {
  422                         if (!first_buf_printf)
  423                                 printf("Final sync complete\n");
  424                         /*
  425                          * Unmount filesystems
  426                          */
  427                         if (panicstr == 0)
  428                                 vfs_unmountall();
  429                 }
  430                 swapoff_all();
  431                 DELAY(100000);          /* wait for console output to finish */
  432         }
  433 
  434         print_uptime();
  435 
  436         /*
  437          * Ok, now do things that assume all filesystem activity has
  438          * been completed.
  439          */
  440         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  441 
  442         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  443                 doadump();
  444 
  445         /* Now that we're going to really halt the system... */
  446         EVENTHANDLER_INVOKE(shutdown_final, howto);
  447 
  448         for(;;) ;       /* safety against shutdown_reset not working */
  449         /* NOTREACHED */
  450 }
  451 
  452 /*
  453  * If the shutdown was a clean halt, behave accordingly.
  454  */
  455 static void
  456 shutdown_halt(void *junk, int howto)
  457 {
  458 
  459         if (howto & RB_HALT) {
  460                 printf("\n");
  461                 printf("The operating system has halted.\n");
  462                 printf("Please press any key to reboot.\n\n");
  463                 switch (cngetc()) {
  464                 case -1:                /* No console, just die */
  465                         cpu_halt();
  466                         /* NOTREACHED */
  467                 default:
  468                         howto &= ~RB_HALT;
  469                         break;
  470                 }
  471         }
  472 }
  473 
  474 /*
  475  * Check to see if the system paniced, pause and then reboot
  476  * according to the specified delay.
  477  */
  478 static void
  479 shutdown_panic(void *junk, int howto)
  480 {
  481         int loop;
  482 
  483         if (howto & RB_DUMP) {
  484                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  485                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  486                                 printf("Automatic reboot in %d seconds - "
  487                                        "press a key on the console to abort\n",
  488                                         PANIC_REBOOT_WAIT_TIME);
  489                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  490                                      loop > 0; --loop) {
  491                                         DELAY(1000 * 100); /* 1/10th second */
  492                                         /* Did user type a key? */
  493                                         if (cncheckc() != -1)
  494                                                 break;
  495                                 }
  496                                 if (!loop)
  497                                         return;
  498                         }
  499                 } else { /* zero time specified - reboot NOW */
  500                         return;
  501                 }
  502                 printf("--> Press a key on the console to reboot,\n");
  503                 printf("--> or switch off the system now.\n");
  504                 cngetc();
  505         }
  506 }
  507 
  508 /*
  509  * Everything done, now reset
  510  */
  511 static void
  512 shutdown_reset(void *junk, int howto)
  513 {
  514 
  515         printf("Rebooting...\n");
  516         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  517 
  518         /*
  519          * Acquiring smp_ipi_mtx here has a double effect:
  520          * - it disables interrupts avoiding CPU0 preemption
  521          *   by fast handlers (thus deadlocking  against other CPUs)
  522          * - it avoids deadlocks against smp_rendezvous() or, more 
  523          *   generally, threads busy-waiting, with this spinlock held,
  524          *   and waiting for responses by threads on other CPUs
  525          *   (ie. smp_tlb_shootdown()).
  526          *
  527          * For the !SMP case it just needs to handle the former problem.
  528          */
  529 #ifdef SMP
  530         mtx_lock_spin(&smp_ipi_mtx);
  531 #else
  532         spinlock_enter();
  533 #endif
  534 
  535         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  536         cpu_reset();
  537         /* NOTREACHED */ /* assuming reset worked */
  538 }
  539 
  540 /*
  541  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  542  * and then reboots.  If we are called twice, then we avoid trying to sync
  543  * the disks as this often leads to recursive panics.
  544  */
  545 void
  546 panic(const char *fmt, ...)
  547 {
  548 #ifdef SMP
  549         static volatile u_int panic_cpu = NOCPU;
  550 #endif
  551         struct thread *td = curthread;
  552         int bootopt, newpanic;
  553         va_list ap;
  554         static char buf[256];
  555 
  556         if (stop_scheduler_on_panic)
  557                 spinlock_enter();
  558         else
  559                 critical_enter();
  560 
  561 #ifdef SMP
  562         /*
  563          * We don't want multiple CPU's to panic at the same time, so we
  564          * use panic_cpu as a simple spinlock.  We have to keep checking
  565          * panic_cpu if we are spinning in case the panic on the first
  566          * CPU is canceled.
  567          */
  568         if (panic_cpu != PCPU_GET(cpuid))
  569                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  570                     PCPU_GET(cpuid)) == 0)
  571                         while (panic_cpu != NOCPU)
  572                                 ; /* nothing */
  573 
  574         if (stop_scheduler_on_panic) {
  575                 if (panicstr == NULL && !kdb_active)
  576                         stop_cpus_hard(PCPU_GET(other_cpus));
  577 
  578                 /*
  579                  * We set stop_scheduler here and not in the block above,
  580                  * because we want to ensure that if panic has been called and
  581                  * stop_scheduler_on_panic is true, then stop_scheduler will
  582                  * always be set.  Even if panic has been entered from kdb.
  583                  */
  584                 td->td_stopsched = 1;
  585         }
  586 #endif
  587 
  588         bootopt = RB_AUTOBOOT | RB_DUMP;
  589         newpanic = 0;
  590         if (panicstr)
  591                 bootopt |= RB_NOSYNC;
  592         else {
  593                 panicstr = fmt;
  594                 newpanic = 1;
  595         }
  596 
  597         va_start(ap, fmt);
  598         if (newpanic) {
  599                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  600                 panicstr = buf;
  601                 printf("panic: %s\n", buf);
  602         } else {
  603                 printf("panic: ");
  604                 vprintf(fmt, ap);
  605                 printf("\n");
  606         }
  607         va_end(ap);
  608 #ifdef SMP
  609         printf("cpuid = %d\n", PCPU_GET(cpuid));
  610 #endif
  611 
  612 #ifdef KDB
  613         if (newpanic && trace_on_panic)
  614                 kdb_backtrace();
  615         if (debugger_on_panic)
  616                 kdb_enter(KDB_WHY_PANIC, "panic");
  617 #ifdef RESTARTABLE_PANICS
  618         /* See if the user aborted the panic, in which case we continue. */
  619         if (panicstr == NULL) {
  620 #ifdef SMP
  621                 atomic_store_rel_int(&panic_cpu, NOCPU);
  622 #endif
  623                 return;
  624         }
  625 #endif
  626 #endif
  627         /*thread_lock(td); */
  628         td->td_flags |= TDF_INPANIC;
  629         /* thread_unlock(td); */
  630         if (!sync_on_panic)
  631                 bootopt |= RB_NOSYNC;
  632         if (!stop_scheduler_on_panic)
  633                 critical_exit();
  634         boot(bootopt);
  635 }
  636 
  637 /*
  638  * Support for poweroff delay.
  639  */
  640 #ifndef POWEROFF_DELAY
  641 # define POWEROFF_DELAY 5000
  642 #endif
  643 static int poweroff_delay = POWEROFF_DELAY;
  644 
  645 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  646         &poweroff_delay, 0, "");
  647 
  648 static void
  649 poweroff_wait(void *junk, int howto)
  650 {
  651 
  652         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  653                 return;
  654         DELAY(poweroff_delay * 1000);
  655 }
  656 
  657 /*
  658  * Some system processes (e.g. syncer) need to be stopped at appropriate
  659  * points in their main loops prior to a system shutdown, so that they
  660  * won't interfere with the shutdown process (e.g. by holding a disk buf
  661  * to cause sync to fail).  For each of these system processes, register
  662  * shutdown_kproc() as a handler for one of shutdown events.
  663  */
  664 static int kproc_shutdown_wait = 60;
  665 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  666     &kproc_shutdown_wait, 0, "");
  667 
  668 void
  669 kproc_shutdown(void *arg, int howto)
  670 {
  671         struct proc *p;
  672         char procname[MAXCOMLEN + 1];
  673         int error;
  674 
  675         if (panicstr)
  676                 return;
  677 
  678         p = (struct proc *)arg;
  679         strlcpy(procname, p->p_comm, sizeof(procname));
  680         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  681             kproc_shutdown_wait, procname);
  682         error = kproc_suspend(p, kproc_shutdown_wait * hz);
  683 
  684         if (error == EWOULDBLOCK)
  685                 printf("timed out\n");
  686         else
  687                 printf("done\n");
  688 }
  689 
  690 void
  691 kthread_shutdown(void *arg, int howto)
  692 {
  693         struct thread *td;
  694         char procname[MAXCOMLEN + 1];
  695         int error;
  696 
  697         if (panicstr)
  698                 return;
  699 
  700         td = (struct thread *)arg;
  701         strlcpy(procname, td->td_name, sizeof(procname));
  702         printf("Waiting (max %d seconds) for system thread `%s' to stop...",
  703             kproc_shutdown_wait, procname);
  704         error = kthread_suspend(td, kproc_shutdown_wait * hz);
  705 
  706         if (error == EWOULDBLOCK)
  707                 printf("timed out\n");
  708         else
  709                 printf("done\n");
  710 }
  711 
  712 /* Registration of dumpers */
  713 int
  714 set_dumper(struct dumperinfo *di)
  715 {
  716 
  717         if (di == NULL) {
  718                 bzero(&dumper, sizeof dumper);
  719                 return (0);
  720         }
  721         if (dumper.dumper != NULL)
  722                 return (EBUSY);
  723         dumper = *di;
  724         return (0);
  725 }
  726 
  727 /* Call dumper with bounds checking. */
  728 int
  729 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
  730     off_t offset, size_t length)
  731 {
  732 
  733         if (length != 0 && (offset < di->mediaoffset ||
  734             offset - di->mediaoffset + length > di->mediasize)) {
  735                 printf("Attempt to write outside dump device boundaries.\n"
  736             "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
  737                     (intmax_t)offset, (intmax_t)di->mediaoffset,
  738                     (uintmax_t)length, (intmax_t)di->mediasize);
  739                 return (ENOSPC);
  740         }
  741         return (di->dumper(di->priv, virtual, physical, offset, length));
  742 }
  743 
  744 void
  745 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
  746     uint64_t dumplen, uint32_t blksz)
  747 {
  748 
  749         bzero(kdh, sizeof(*kdh));
  750         strncpy(kdh->magic, magic, sizeof(kdh->magic));
  751         strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
  752         kdh->version = htod32(KERNELDUMPVERSION);
  753         kdh->architectureversion = htod32(archver);
  754         kdh->dumplength = htod64(dumplen);
  755         kdh->dumptime = htod64(time_second);
  756         kdh->blocksize = htod32(blksz);
  757         strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
  758         strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
  759         if (panicstr != NULL)
  760                 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
  761         kdh->parity = kerneldump_parity(kdh);
  762 }
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_shutdown.c

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