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: stable/7/sys/kern/kern_shutdown.c 213935 2010-10-16 20:01:41Z avg $");
   39 
   40 #include "opt_ddb.h"
   41 #include "opt_kdb.h"
   42 #include "opt_mac.h"
   43 #include "opt_panic.h"
   44 #include "opt_show_busybufs.h"
   45 #include "opt_sched.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/bio.h>
   50 #include <sys/buf.h>
   51 #include <sys/conf.h>
   52 #include <sys/cons.h>
   53 #include <sys/eventhandler.h>
   54 #include <sys/kdb.h>
   55 #include <sys/kernel.h>
   56 #include <sys/kthread.h>
   57 #include <sys/malloc.h>
   58 #include <sys/mount.h>
   59 #include <sys/priv.h>
   60 #include <sys/proc.h>
   61 #include <sys/reboot.h>
   62 #include <sys/resourcevar.h>
   63 #include <sys/sched.h>
   64 #include <sys/smp.h>            /* smp_active */
   65 #include <sys/sysctl.h>
   66 #include <sys/sysproto.h>
   67 
   68 #include <ddb/ddb.h>
   69 
   70 #include <machine/cpu.h>
   71 #include <machine/pcb.h>
   72 #include <machine/smp.h>
   73 
   74 #include <security/mac/mac_framework.h>
   75 
   76 #include <vm/vm.h>
   77 #include <vm/vm_object.h>
   78 #include <vm/vm_page.h>
   79 #include <vm/vm_pager.h>
   80 #include <vm/swap_pager.h>
   81 
   82 #include <sys/signalvar.h>
   83 
   84 #ifndef PANIC_REBOOT_WAIT_TIME
   85 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   86 #endif
   87 
   88 /*
   89  * Note that stdarg.h and the ANSI style va_start macro is used for both
   90  * ANSI and traditional C compilers.
   91  */
   92 #include <machine/stdarg.h>
   93 
   94 #ifdef KDB
   95 #ifdef KDB_UNATTENDED
   96 int debugger_on_panic = 0;
   97 #else
   98 int debugger_on_panic = 1;
   99 #endif
  100 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  101         &debugger_on_panic, 0, "Run debugger on kernel panic");
  102 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
  103 
  104 #ifdef KDB_TRACE
  105 static int trace_on_panic = 1;
  106 #else
  107 static int trace_on_panic = 0;
  108 #endif
  109 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  110         &trace_on_panic, 0, "Print stack trace on kernel panic");
  111 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic);
  112 #endif /* KDB */
  113 
  114 static int sync_on_panic = 0;
  115 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  116         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  117 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic);
  118 
  119 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  120 
  121 /*
  122  * Variable panicstr contains argument to first call to panic; used as flag
  123  * to indicate that the kernel has already called panic.
  124  */
  125 const char *panicstr;
  126 
  127 int dumping;                            /* system is dumping */
  128 int rebooting;                          /* system is rebooting */
  129 static struct dumperinfo dumper;        /* our selected dumper */
  130 
  131 /* Context information for dump-debuggers. */
  132 static struct pcb dumppcb;              /* Registers. */
  133 static lwpid_t dumptid;                 /* Thread ID. */
  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 
  146         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  147             SHUTDOWN_PRI_FIRST);
  148         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  149             SHUTDOWN_PRI_LAST + 100);
  150         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  151             SHUTDOWN_PRI_LAST + 100);
  152         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  153             SHUTDOWN_PRI_LAST + 200);
  154 }
  155 
  156 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
  157 
  158 /*
  159  * The system call that results in a reboot.
  160  */
  161 /* ARGSUSED */
  162 int
  163 reboot(struct thread *td, struct reboot_args *uap)
  164 {
  165         int error;
  166 
  167         error = 0;
  168 #ifdef MAC
  169         error = mac_check_system_reboot(td->td_ucred, uap->opt);
  170 #endif
  171         if (error == 0)
  172                 error = priv_check(td, PRIV_REBOOT);
  173         if (error == 0) {
  174                 mtx_lock(&Giant);
  175                 boot(uap->opt);
  176                 mtx_unlock(&Giant);
  177         }
  178         return (error);
  179 }
  180 
  181 /*
  182  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  183  */
  184 static int shutdown_howto = 0;
  185 
  186 void
  187 shutdown_nice(int howto)
  188 {
  189 
  190         shutdown_howto = howto;
  191 
  192         /* Send a signal to init(8) and have it shutdown the world */
  193         if (initproc != NULL) {
  194                 PROC_LOCK(initproc);
  195                 psignal(initproc, SIGINT);
  196                 PROC_UNLOCK(initproc);
  197         } else {
  198                 /* No init(8) running, so simply reboot */
  199                 boot(RB_NOSYNC);
  200         }
  201         return;
  202 }
  203 static int      waittime = -1;
  204 
  205 static void
  206 print_uptime(void)
  207 {
  208         int f;
  209         struct timespec ts;
  210 
  211         getnanouptime(&ts);
  212         printf("Uptime: ");
  213         f = 0;
  214         if (ts.tv_sec >= 86400) {
  215                 printf("%ldd", (long)ts.tv_sec / 86400);
  216                 ts.tv_sec %= 86400;
  217                 f = 1;
  218         }
  219         if (f || ts.tv_sec >= 3600) {
  220                 printf("%ldh", (long)ts.tv_sec / 3600);
  221                 ts.tv_sec %= 3600;
  222                 f = 1;
  223         }
  224         if (f || ts.tv_sec >= 60) {
  225                 printf("%ldm", (long)ts.tv_sec / 60);
  226                 ts.tv_sec %= 60;
  227                 f = 1;
  228         }
  229         printf("%lds\n", (long)ts.tv_sec);
  230 }
  231 
  232 static void
  233 doadump(void)
  234 {
  235 
  236         /*
  237          * Sometimes people have to call this from the kernel debugger. 
  238          * (if 'panic' can not dump)
  239          * Give them a clue as to why they can't dump.
  240          */
  241         if (dumper.dumper == NULL) {
  242                 printf("Cannot dump. No dump device defined.\n");
  243                 return;
  244         }
  245 
  246         savectx(&dumppcb);
  247         dumptid = curthread->td_tid;
  248         dumping++;
  249 #ifdef DDB
  250         if (textdump_pending)
  251                 textdump_dumpsys(&dumper);
  252         else
  253 #endif
  254                 dumpsys(&dumper);
  255         dumping--;
  256 }
  257 
  258 static int
  259 isbufbusy(struct buf *bp)
  260 {
  261         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  262             BUF_REFCNT(bp) > 0) ||
  263             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  264                 return (1);
  265         return (0);
  266 }
  267 
  268 /*
  269  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  270  */
  271 static void
  272 boot(int howto)
  273 {
  274         static int first_buf_printf = 1;
  275 
  276 #if defined(SMP)
  277         /*
  278          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  279          * systems don't shutdown properly (i.e., ACPI power off) if we
  280          * run on another processor.
  281          */
  282         thread_lock(curthread);
  283         sched_bind(curthread, 0);
  284         thread_unlock(curthread);
  285         KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
  286 #endif
  287         /* We're in the process of rebooting. */
  288         rebooting = 1;
  289 
  290         /* collect extra flags that shutdown_nice might have set */
  291         howto |= shutdown_howto;
  292 
  293         /* We are out of the debugger now. */
  294         kdb_active = 0;
  295 
  296         /*
  297          * Do any callouts that should be done BEFORE syncing the filesystems.
  298          */
  299         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  300 
  301         /* 
  302          * Now sync filesystems
  303          */
  304         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  305                 register struct buf *bp;
  306                 int iter, nbusy, pbusy;
  307 #ifndef PREEMPTION
  308                 int subiter;
  309 #endif
  310 
  311                 waittime = 0;
  312 
  313                 sync(curthread, NULL);
  314 
  315                 /*
  316                  * With soft updates, some buffers that are
  317                  * written will be remarked as dirty until other
  318                  * buffers are written.
  319                  */
  320                 for (iter = pbusy = 0; iter < 20; iter++) {
  321                         nbusy = 0;
  322                         for (bp = &buf[nbuf]; --bp >= buf; )
  323                                 if (isbufbusy(bp))
  324                                         nbusy++;
  325                         if (nbusy == 0) {
  326                                 if (first_buf_printf)
  327                                         printf("All buffers synced.");
  328                                 break;
  329                         }
  330                         if (first_buf_printf) {
  331                                 printf("Syncing disks, buffers remaining... ");
  332                                 first_buf_printf = 0;
  333                         }
  334                         printf("%d ", nbusy);
  335                         if (nbusy < pbusy)
  336                                 iter = 0;
  337                         pbusy = nbusy;
  338                         sync(curthread, NULL);
  339 
  340 #ifdef PREEMPTION
  341                         /*
  342                          * Drop Giant and spin for a while to allow
  343                          * interrupt threads to run.
  344                          */
  345                         DROP_GIANT();
  346                         DELAY(50000 * iter);
  347                         PICKUP_GIANT();
  348 #else
  349                         /*
  350                          * Drop Giant and context switch several times to
  351                          * allow interrupt threads to run.
  352                          */
  353                         DROP_GIANT();
  354                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  355                                 thread_lock(curthread);
  356                                 mi_switch(SW_VOL, NULL);
  357                                 thread_unlock(curthread);
  358                                 DELAY(1000);
  359                         }
  360                         PICKUP_GIANT();
  361 #endif
  362                 }
  363                 printf("\n");
  364                 /*
  365                  * Count only busy local buffers to prevent forcing 
  366                  * a fsck if we're just a client of a wedged NFS server
  367                  */
  368                 nbusy = 0;
  369                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  370                         if (isbufbusy(bp)) {
  371 #if 0
  372 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  373                                 if (bp->b_dev == NULL) {
  374                                         TAILQ_REMOVE(&mountlist,
  375                                             bp->b_vp->v_mount, mnt_list);
  376                                         continue;
  377                                 }
  378 #endif
  379                                 nbusy++;
  380 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  381                                 printf(
  382                             "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
  383                                     nbusy, bp->b_bufobj,
  384                                     bp->b_flags, (long)bp->b_blkno,
  385                                     (long)bp->b_lblkno);
  386 #endif
  387                         }
  388                 }
  389                 if (nbusy) {
  390                         /*
  391                          * Failed to sync all blocks. Indicate this and don't
  392                          * unmount filesystems (thus forcing an fsck on reboot).
  393                          */
  394                         printf("Giving up on %d buffers\n", nbusy);
  395                         DELAY(5000000); /* 5 seconds */
  396                 } else {
  397                         if (!first_buf_printf)
  398                                 printf("Final sync complete\n");
  399                         /*
  400                          * Unmount filesystems
  401                          */
  402                         if (panicstr == 0)
  403                                 vfs_unmountall();
  404                 }
  405                 swapoff_all();
  406                 DELAY(100000);          /* wait for console output to finish */
  407         }
  408 
  409         print_uptime();
  410 
  411         /*
  412          * Ok, now do things that assume all filesystem activity has
  413          * been completed.
  414          */
  415         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  416 
  417         /* XXX This doesn't disable interrupts any more.  Reconsider? */
  418         splhigh();
  419 
  420         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  421                 doadump();
  422 
  423         /* Now that we're going to really halt the system... */
  424         EVENTHANDLER_INVOKE(shutdown_final, howto);
  425 
  426         for(;;) ;       /* safety against shutdown_reset not working */
  427         /* NOTREACHED */
  428 }
  429 
  430 /*
  431  * If the shutdown was a clean halt, behave accordingly.
  432  */
  433 static void
  434 shutdown_halt(void *junk, int howto)
  435 {
  436 
  437         if (howto & RB_HALT) {
  438                 printf("\n");
  439                 printf("The operating system has halted.\n");
  440                 printf("Please press any key to reboot.\n\n");
  441                 switch (cngetc()) {
  442                 case -1:                /* No console, just die */
  443                         cpu_halt();
  444                         /* NOTREACHED */
  445                 default:
  446                         howto &= ~RB_HALT;
  447                         break;
  448                 }
  449         }
  450 }
  451 
  452 /*
  453  * Check to see if the system paniced, pause and then reboot
  454  * according to the specified delay.
  455  */
  456 static void
  457 shutdown_panic(void *junk, int howto)
  458 {
  459         int loop;
  460 
  461         if (howto & RB_DUMP) {
  462                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  463                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  464                                 printf("Automatic reboot in %d seconds - "
  465                                        "press a key on the console to abort\n",
  466                                         PANIC_REBOOT_WAIT_TIME);
  467                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  468                                      loop > 0; --loop) {
  469                                         DELAY(1000 * 100); /* 1/10th second */
  470                                         /* Did user type a key? */
  471                                         if (cncheckc() != -1)
  472                                                 break;
  473                                 }
  474                                 if (!loop)
  475                                         return;
  476                         }
  477                 } else { /* zero time specified - reboot NOW */
  478                         return;
  479                 }
  480                 printf("--> Press a key on the console to reboot,\n");
  481                 printf("--> or switch off the system now.\n");
  482                 cngetc();
  483         }
  484 }
  485 
  486 /*
  487  * Everything done, now reset
  488  */
  489 static void
  490 shutdown_reset(void *junk, int howto)
  491 {
  492 
  493         printf("Rebooting...\n");
  494         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  495         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  496         cpu_reset();
  497         /* NOTREACHED */ /* assuming reset worked */
  498 }
  499 
  500 /*
  501  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  502  * and then reboots.  If we are called twice, then we avoid trying to sync
  503  * the disks as this often leads to recursive panics.
  504  */
  505 void
  506 panic(const char *fmt, ...)
  507 {
  508 #ifdef SMP
  509         static volatile u_int panic_cpu = NOCPU;
  510 #endif
  511         struct thread *td = curthread;
  512         int bootopt, newpanic;
  513         va_list ap;
  514         static char buf[256];
  515 
  516         critical_enter();
  517 #ifdef SMP
  518         /*
  519          * We don't want multiple CPU's to panic at the same time, so we
  520          * use panic_cpu as a simple spinlock.  We have to keep checking
  521          * panic_cpu if we are spinning in case the panic on the first
  522          * CPU is canceled.
  523          */
  524         if (panic_cpu != PCPU_GET(cpuid))
  525                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  526                     PCPU_GET(cpuid)) == 0)
  527                         while (panic_cpu != NOCPU)
  528                                 ; /* nothing */
  529 #endif
  530 
  531         bootopt = RB_AUTOBOOT | RB_DUMP;
  532         newpanic = 0;
  533         if (panicstr)
  534                 bootopt |= RB_NOSYNC;
  535         else {
  536                 panicstr = fmt;
  537                 newpanic = 1;
  538         }
  539 
  540         va_start(ap, fmt);
  541         if (newpanic) {
  542                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  543                 panicstr = buf;
  544                 printf("panic: %s\n", buf);
  545         } else {
  546                 printf("panic: ");
  547                 vprintf(fmt, ap);
  548                 printf("\n");
  549         }
  550         va_end(ap);
  551 #ifdef SMP
  552         printf("cpuid = %d\n", PCPU_GET(cpuid));
  553 #endif
  554 
  555 #ifdef KDB
  556         if (newpanic && trace_on_panic)
  557                 kdb_backtrace();
  558         if (debugger_on_panic)
  559                 kdb_enter_why(KDB_WHY_PANIC, "panic");
  560 #ifdef RESTARTABLE_PANICS
  561         /* See if the user aborted the panic, in which case we continue. */
  562         if (panicstr == NULL) {
  563 #ifdef SMP
  564                 atomic_store_rel_int(&panic_cpu, NOCPU);
  565 #endif
  566                 return;
  567         }
  568 #endif
  569 #endif
  570         /*thread_lock(td); */
  571         td->td_flags |= TDF_INPANIC;
  572         /* thread_unlock(td); */
  573         if (!sync_on_panic)
  574                 bootopt |= RB_NOSYNC;
  575         critical_exit();
  576         boot(bootopt);
  577 }
  578 
  579 /*
  580  * Support for poweroff delay.
  581  */
  582 #ifndef POWEROFF_DELAY
  583 # define POWEROFF_DELAY 5000
  584 #endif
  585 static int poweroff_delay = POWEROFF_DELAY;
  586 
  587 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  588         &poweroff_delay, 0, "");
  589 
  590 static void
  591 poweroff_wait(void *junk, int howto)
  592 {
  593 
  594         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  595                 return;
  596         DELAY(poweroff_delay * 1000);
  597 }
  598 
  599 /*
  600  * Some system processes (e.g. syncer) need to be stopped at appropriate
  601  * points in their main loops prior to a system shutdown, so that they
  602  * won't interfere with the shutdown process (e.g. by holding a disk buf
  603  * to cause sync to fail).  For each of these system processes, register
  604  * shutdown_kproc() as a handler for one of shutdown events.
  605  */
  606 static int kproc_shutdown_wait = 60;
  607 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  608     &kproc_shutdown_wait, 0, "");
  609 
  610 void
  611 kproc_shutdown(void *arg, int howto)
  612 {
  613         struct proc *p;
  614         char procname[MAXCOMLEN + 1];
  615         int error;
  616 
  617         if (panicstr)
  618                 return;
  619 
  620         p = (struct proc *)arg;
  621         strlcpy(procname, p->p_comm, sizeof(procname));
  622         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  623             kproc_shutdown_wait, procname);
  624         error = kthread_suspend(p, kproc_shutdown_wait * hz);
  625 
  626         if (error == EWOULDBLOCK)
  627                 printf("timed out\n");
  628         else
  629                 printf("done\n");
  630 }
  631 
  632 /* Registration of dumpers */
  633 int
  634 set_dumper(struct dumperinfo *di)
  635 {
  636 
  637         if (di == NULL) {
  638                 bzero(&dumper, sizeof dumper);
  639                 return (0);
  640         }
  641         if (dumper.dumper != NULL)
  642                 return (EBUSY);
  643         dumper = *di;
  644         return (0);
  645 }
  646 
  647 /* Call dumper with bounds checking. */
  648 int
  649 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
  650     off_t offset, size_t length)
  651 {
  652 
  653         if (length != 0 && (offset < di->mediaoffset ||
  654             offset - di->mediaoffset + length > di->mediasize)) {
  655                 printf("Attempt to write outside dump device boundaries.\n");
  656                 return (ENXIO);
  657         }
  658         return (di->dumper(di->priv, virtual, physical, offset, length));
  659 }
  660 
  661 #if defined(__powerpc__)
  662 void
  663 dumpsys(struct dumperinfo *di __unused)
  664 {
  665 
  666         printf("Kernel dumps not implemented on this architecture\n");
  667 }
  668 #endif

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