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