1 /*-
2 * Copyright (c) 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/9.1/sys/kern/kern_shutdown.c 237979 2012-07-02 08:21:15Z obrien $");
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,
104 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN,
105 &debugger_on_panic, 0, "Run debugger on kernel panic");
106 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
107
108 #ifdef KDB_TRACE
109 static int trace_on_panic = 1;
110 #else
111 static int trace_on_panic = 0;
112 #endif
113 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic,
114 CTLFLAG_RW | CTLFLAG_SECURE | 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 static int stop_scheduler_on_panic = 1;
125 SYSCTL_INT(_kern, OID_AUTO, stop_scheduler_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
126 &stop_scheduler_on_panic, 0, "stop scheduler upon entering panic");
127 TUNABLE_INT("kern.stop_scheduler_on_panic", &stop_scheduler_on_panic);
128
129 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
130
131 #ifndef DIAGNOSTIC
132 static int show_busybufs;
133 #else
134 static int show_busybufs = 1;
135 #endif
136 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
137 &show_busybufs, 0, "");
138
139 /*
140 * Variable panicstr contains argument to first call to panic; used as flag
141 * to indicate that the kernel has already called panic.
142 */
143 const char *panicstr;
144
145 int dumping; /* system is dumping */
146 int rebooting; /* system is rebooting */
147 static struct dumperinfo dumper; /* our selected dumper */
148
149 /* Context information for dump-debuggers. */
150 static struct pcb dumppcb; /* Registers. */
151 static lwpid_t dumptid; /* Thread ID. */
152
153 static void poweroff_wait(void *, int);
154 static void shutdown_halt(void *junk, int howto);
155 static void shutdown_panic(void *junk, int howto);
156 static void shutdown_reset(void *junk, int howto);
157
158 /* register various local shutdown events */
159 static void
160 shutdown_conf(void *unused)
161 {
162
163 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
164 SHUTDOWN_PRI_FIRST);
165 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
166 SHUTDOWN_PRI_LAST + 100);
167 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
168 SHUTDOWN_PRI_LAST + 100);
169 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
170 SHUTDOWN_PRI_LAST + 200);
171 }
172
173 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
174
175 /*
176 * The system call that results in a reboot.
177 */
178 /* ARGSUSED */
179 int
180 sys_reboot(struct thread *td, struct reboot_args *uap)
181 {
182 int error;
183
184 error = 0;
185 #ifdef MAC
186 error = mac_system_check_reboot(td->td_ucred, uap->opt);
187 #endif
188 if (error == 0)
189 error = priv_check(td, PRIV_REBOOT);
190 if (error == 0) {
191 mtx_lock(&Giant);
192 kern_reboot(uap->opt);
193 mtx_unlock(&Giant);
194 }
195 return (error);
196 }
197
198 /*
199 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
200 */
201 static int shutdown_howto = 0;
202
203 void
204 shutdown_nice(int howto)
205 {
206
207 shutdown_howto = howto;
208
209 /* Send a signal to init(8) and have it shutdown the world */
210 if (initproc != NULL) {
211 PROC_LOCK(initproc);
212 kern_psignal(initproc, SIGINT);
213 PROC_UNLOCK(initproc);
214 } else {
215 /* No init(8) running, so simply reboot */
216 kern_reboot(RB_NOSYNC);
217 }
218 return;
219 }
220 static int waittime = -1;
221
222 static void
223 print_uptime(void)
224 {
225 int f;
226 struct timespec ts;
227
228 getnanouptime(&ts);
229 printf("Uptime: ");
230 f = 0;
231 if (ts.tv_sec >= 86400) {
232 printf("%ldd", (long)ts.tv_sec / 86400);
233 ts.tv_sec %= 86400;
234 f = 1;
235 }
236 if (f || ts.tv_sec >= 3600) {
237 printf("%ldh", (long)ts.tv_sec / 3600);
238 ts.tv_sec %= 3600;
239 f = 1;
240 }
241 if (f || ts.tv_sec >= 60) {
242 printf("%ldm", (long)ts.tv_sec / 60);
243 ts.tv_sec %= 60;
244 f = 1;
245 }
246 printf("%lds\n", (long)ts.tv_sec);
247 }
248
249 int
250 doadump(boolean_t textdump)
251 {
252 boolean_t coredump;
253
254 if (dumping)
255 return (EBUSY);
256 if (dumper.dumper == NULL)
257 return (ENXIO);
258
259 savectx(&dumppcb);
260 dumptid = curthread->td_tid;
261 dumping++;
262
263 coredump = TRUE;
264 #ifdef DDB
265 if (textdump && textdump_pending) {
266 coredump = FALSE;
267 textdump_dumpsys(&dumper);
268 }
269 #endif
270 if (coredump)
271 dumpsys(&dumper);
272
273 dumping--;
274 return (0);
275 }
276
277 static int
278 isbufbusy(struct buf *bp)
279 {
280 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
281 BUF_ISLOCKED(bp)) ||
282 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
283 return (1);
284 return (0);
285 }
286
287 /*
288 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
289 */
290 void
291 kern_reboot(int howto)
292 {
293 static int first_buf_printf = 1;
294
295 #if defined(SMP)
296 /*
297 * Bind us to CPU 0 so that all shutdown code runs there. Some
298 * systems don't shutdown properly (i.e., ACPI power off) if we
299 * run on another processor.
300 */
301 if (!SCHEDULER_STOPPED()) {
302 thread_lock(curthread);
303 sched_bind(curthread, 0);
304 thread_unlock(curthread);
305 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
306 }
307 #endif
308 /* We're in the process of rebooting. */
309 rebooting = 1;
310
311 /* collect extra flags that shutdown_nice might have set */
312 howto |= shutdown_howto;
313
314 /* We are out of the debugger now. */
315 kdb_active = 0;
316
317 /*
318 * Do any callouts that should be done BEFORE syncing the filesystems.
319 */
320 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
321
322 /*
323 * Now sync filesystems
324 */
325 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
326 register struct buf *bp;
327 int iter, nbusy, pbusy;
328 #ifndef PREEMPTION
329 int subiter;
330 #endif
331
332 waittime = 0;
333
334 wdog_kern_pat(WD_LASTVAL);
335 sys_sync(curthread, NULL);
336
337 /*
338 * With soft updates, some buffers that are
339 * written will be remarked as dirty until other
340 * buffers are written.
341 */
342 for (iter = pbusy = 0; iter < 20; iter++) {
343 nbusy = 0;
344 for (bp = &buf[nbuf]; --bp >= buf; )
345 if (isbufbusy(bp))
346 nbusy++;
347 if (nbusy == 0) {
348 if (first_buf_printf)
349 printf("All buffers synced.");
350 break;
351 }
352 if (first_buf_printf) {
353 printf("Syncing disks, buffers remaining... ");
354 first_buf_printf = 0;
355 }
356 printf("%d ", nbusy);
357 if (nbusy < pbusy)
358 iter = 0;
359 pbusy = nbusy;
360
361 wdog_kern_pat(WD_LASTVAL);
362 sys_sync(curthread, NULL);
363
364 #ifdef PREEMPTION
365 /*
366 * Drop Giant and spin for a while to allow
367 * interrupt threads to run.
368 */
369 DROP_GIANT();
370 DELAY(50000 * iter);
371 PICKUP_GIANT();
372 #else
373 /*
374 * Drop Giant and context switch several times to
375 * allow interrupt threads to run.
376 */
377 DROP_GIANT();
378 for (subiter = 0; subiter < 50 * iter; subiter++) {
379 thread_lock(curthread);
380 mi_switch(SW_VOL, NULL);
381 thread_unlock(curthread);
382 DELAY(1000);
383 }
384 PICKUP_GIANT();
385 #endif
386 }
387 printf("\n");
388 /*
389 * Count only busy local buffers to prevent forcing
390 * a fsck if we're just a client of a wedged NFS server
391 */
392 nbusy = 0;
393 for (bp = &buf[nbuf]; --bp >= buf; ) {
394 if (isbufbusy(bp)) {
395 #if 0
396 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
397 if (bp->b_dev == NULL) {
398 TAILQ_REMOVE(&mountlist,
399 bp->b_vp->v_mount, mnt_list);
400 continue;
401 }
402 #endif
403 nbusy++;
404 if (show_busybufs > 0) {
405 printf(
406 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:",
407 nbusy, bp, bp->b_vp, bp->b_flags,
408 (intmax_t)bp->b_blkno,
409 (intmax_t)bp->b_lblkno);
410 BUF_LOCKPRINTINFO(bp);
411 if (show_busybufs > 1)
412 vn_printf(bp->b_vp,
413 "vnode content: ");
414 }
415 }
416 }
417 if (nbusy) {
418 /*
419 * Failed to sync all blocks. Indicate this and don't
420 * unmount filesystems (thus forcing an fsck on reboot).
421 */
422 printf("Giving up on %d buffers\n", nbusy);
423 DELAY(5000000); /* 5 seconds */
424 } else {
425 if (!first_buf_printf)
426 printf("Final sync complete\n");
427 /*
428 * Unmount filesystems
429 */
430 if (panicstr == 0)
431 vfs_unmountall();
432 }
433 swapoff_all();
434 DELAY(100000); /* wait for console output to finish */
435 }
436
437 print_uptime();
438
439 cngrab();
440
441 /*
442 * Ok, now do things that assume all filesystem activity has
443 * been completed.
444 */
445 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
446
447 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
448 doadump(TRUE);
449
450 /* Now that we're going to really halt the system... */
451 EVENTHANDLER_INVOKE(shutdown_final, howto);
452
453 for(;;) ; /* safety against shutdown_reset not working */
454 /* NOTREACHED */
455 }
456
457 /*
458 * If the shutdown was a clean halt, behave accordingly.
459 */
460 static void
461 shutdown_halt(void *junk, int howto)
462 {
463
464 if (howto & RB_HALT) {
465 printf("\n");
466 printf("The operating system has halted.\n");
467 printf("Please press any key to reboot.\n\n");
468 switch (cngetc()) {
469 case -1: /* No console, just die */
470 cpu_halt();
471 /* NOTREACHED */
472 default:
473 howto &= ~RB_HALT;
474 break;
475 }
476 }
477 }
478
479 /*
480 * Check to see if the system paniced, pause and then reboot
481 * according to the specified delay.
482 */
483 static void
484 shutdown_panic(void *junk, int howto)
485 {
486 int loop;
487
488 if (howto & RB_DUMP) {
489 if (PANIC_REBOOT_WAIT_TIME != 0) {
490 if (PANIC_REBOOT_WAIT_TIME != -1) {
491 printf("Automatic reboot in %d seconds - "
492 "press a key on the console to abort\n",
493 PANIC_REBOOT_WAIT_TIME);
494 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
495 loop > 0; --loop) {
496 DELAY(1000 * 100); /* 1/10th second */
497 /* Did user type a key? */
498 if (cncheckc() != -1)
499 break;
500 }
501 if (!loop)
502 return;
503 }
504 } else { /* zero time specified - reboot NOW */
505 return;
506 }
507 printf("--> Press a key on the console to reboot,\n");
508 printf("--> or switch off the system now.\n");
509 cngetc();
510 }
511 }
512
513 /*
514 * Everything done, now reset
515 */
516 static void
517 shutdown_reset(void *junk, int howto)
518 {
519
520 printf("Rebooting...\n");
521 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
522
523 /*
524 * Acquiring smp_ipi_mtx here has a double effect:
525 * - it disables interrupts avoiding CPU0 preemption
526 * by fast handlers (thus deadlocking against other CPUs)
527 * - it avoids deadlocks against smp_rendezvous() or, more
528 * generally, threads busy-waiting, with this spinlock held,
529 * and waiting for responses by threads on other CPUs
530 * (ie. smp_tlb_shootdown()).
531 *
532 * For the !SMP case it just needs to handle the former problem.
533 */
534 #ifdef SMP
535 mtx_lock_spin(&smp_ipi_mtx);
536 #else
537 spinlock_enter();
538 #endif
539
540 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
541 cpu_reset();
542 /* NOTREACHED */ /* assuming reset worked */
543 }
544
545 /*
546 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
547 * and then reboots. If we are called twice, then we avoid trying to sync
548 * the disks as this often leads to recursive panics.
549 */
550 void
551 panic(const char *fmt, ...)
552 {
553 #ifdef SMP
554 static volatile u_int panic_cpu = NOCPU;
555 cpuset_t other_cpus;
556 #endif
557 struct thread *td = curthread;
558 int bootopt, newpanic;
559 va_list ap;
560 static char buf[256];
561
562 if (stop_scheduler_on_panic)
563 spinlock_enter();
564 else
565 critical_enter();
566
567 #ifdef SMP
568 /*
569 * We don't want multiple CPU's to panic at the same time, so we
570 * use panic_cpu as a simple spinlock. We have to keep checking
571 * panic_cpu if we are spinning in case the panic on the first
572 * CPU is canceled.
573 */
574 if (panic_cpu != PCPU_GET(cpuid))
575 while (atomic_cmpset_int(&panic_cpu, NOCPU,
576 PCPU_GET(cpuid)) == 0)
577 while (panic_cpu != NOCPU)
578 ; /* nothing */
579
580 if (stop_scheduler_on_panic) {
581 if (panicstr == NULL && !kdb_active) {
582 other_cpus = all_cpus;
583 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
584 stop_cpus_hard(other_cpus);
585 }
586
587 /*
588 * We set stop_scheduler here and not in the block above,
589 * because we want to ensure that if panic has been called and
590 * stop_scheduler_on_panic is true, then stop_scheduler will
591 * always be set. Even if panic has been entered from kdb.
592 */
593 td->td_stopsched = 1;
594 }
595 #endif
596
597 bootopt = RB_AUTOBOOT;
598 newpanic = 0;
599 if (panicstr)
600 bootopt |= RB_NOSYNC;
601 else {
602 bootopt |= RB_DUMP;
603 panicstr = fmt;
604 newpanic = 1;
605 }
606
607 va_start(ap, fmt);
608 if (newpanic) {
609 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
610 panicstr = buf;
611 cngrab();
612 printf("panic: %s\n", buf);
613 } else {
614 printf("panic: ");
615 vprintf(fmt, ap);
616 printf("\n");
617 }
618 va_end(ap);
619 #ifdef SMP
620 printf("cpuid = %d\n", PCPU_GET(cpuid));
621 #endif
622
623 #ifdef KDB
624 if (newpanic && trace_on_panic)
625 kdb_backtrace();
626 if (debugger_on_panic)
627 kdb_enter(KDB_WHY_PANIC, "panic");
628 #endif
629 /*thread_lock(td); */
630 td->td_flags |= TDF_INPANIC;
631 /* thread_unlock(td); */
632 if (!sync_on_panic)
633 bootopt |= RB_NOSYNC;
634 if (!stop_scheduler_on_panic)
635 critical_exit();
636 kern_reboot(bootopt);
637 }
638
639 /*
640 * Support for poweroff delay.
641 *
642 * Please note that setting this delay too short might power off your machine
643 * before the write cache on your hard disk has been flushed, leading to
644 * soft-updates inconsistencies.
645 */
646 #ifndef POWEROFF_DELAY
647 # define POWEROFF_DELAY 5000
648 #endif
649 static int poweroff_delay = POWEROFF_DELAY;
650
651 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
652 &poweroff_delay, 0, "");
653
654 static void
655 poweroff_wait(void *junk, int howto)
656 {
657
658 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
659 return;
660 DELAY(poweroff_delay * 1000);
661 }
662
663 /*
664 * Some system processes (e.g. syncer) need to be stopped at appropriate
665 * points in their main loops prior to a system shutdown, so that they
666 * won't interfere with the shutdown process (e.g. by holding a disk buf
667 * to cause sync to fail). For each of these system processes, register
668 * shutdown_kproc() as a handler for one of shutdown events.
669 */
670 static int kproc_shutdown_wait = 60;
671 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
672 &kproc_shutdown_wait, 0, "");
673
674 void
675 kproc_shutdown(void *arg, int howto)
676 {
677 struct proc *p;
678 int error;
679
680 if (panicstr)
681 return;
682
683 p = (struct proc *)arg;
684 printf("Waiting (max %d seconds) for system process `%s' to stop...",
685 kproc_shutdown_wait, p->p_comm);
686 error = kproc_suspend(p, kproc_shutdown_wait * hz);
687
688 if (error == EWOULDBLOCK)
689 printf("timed out\n");
690 else
691 printf("done\n");
692 }
693
694 void
695 kthread_shutdown(void *arg, int howto)
696 {
697 struct thread *td;
698 int error;
699
700 if (panicstr)
701 return;
702
703 td = (struct thread *)arg;
704 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
705 kproc_shutdown_wait, td->td_name);
706 error = kthread_suspend(td, kproc_shutdown_wait * hz);
707
708 if (error == EWOULDBLOCK)
709 printf("timed out\n");
710 else
711 printf("done\n");
712 }
713
714 /* Registration of dumpers */
715 int
716 set_dumper(struct dumperinfo *di)
717 {
718
719 if (di == NULL) {
720 bzero(&dumper, sizeof dumper);
721 return (0);
722 }
723 if (dumper.dumper != NULL)
724 return (EBUSY);
725 dumper = *di;
726 return (0);
727 }
728
729 /* Call dumper with bounds checking. */
730 int
731 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
732 off_t offset, size_t length)
733 {
734
735 if (length != 0 && (offset < di->mediaoffset ||
736 offset - di->mediaoffset + length > di->mediasize)) {
737 printf("Attempt to write outside dump device boundaries.\n"
738 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
739 (intmax_t)offset, (intmax_t)di->mediaoffset,
740 (uintmax_t)length, (intmax_t)di->mediasize);
741 return (ENOSPC);
742 }
743 return (di->dumper(di->priv, virtual, physical, offset, length));
744 }
745
746 void
747 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
748 uint64_t dumplen, uint32_t blksz)
749 {
750
751 bzero(kdh, sizeof(*kdh));
752 strncpy(kdh->magic, magic, sizeof(kdh->magic));
753 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
754 kdh->version = htod32(KERNELDUMPVERSION);
755 kdh->architectureversion = htod32(archver);
756 kdh->dumplength = htod64(dumplen);
757 kdh->dumptime = htod64(time_second);
758 kdh->blocksize = htod32(blksz);
759 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
760 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
761 if (panicstr != NULL)
762 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
763 kdh->parity = kerneldump_parity(kdh);
764 }
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