kern_shutdown.c revision 235404
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/9/sys/kern/kern_shutdown.c 235404 2012-05-13 17:01:32Z avg $"); 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 101int debugger_on_panic = 0; 102#else 103int debugger_on_panic = 1; 104#endif 105SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 106 &debugger_on_panic, 0, "Run debugger on kernel panic"); 107TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic); 108 109#ifdef KDB_TRACE 110static int trace_on_panic = 1; 111#else 112static int trace_on_panic = 0; 113#endif 114SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 115 &trace_on_panic, 0, "Print stack trace on kernel panic"); 116TUNABLE_INT("debug.trace_on_panic", &trace_on_panic); 117#endif /* KDB */ 118 119static int sync_on_panic = 0; 120SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 121 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 122TUNABLE_INT("kern.sync_on_panic", &sync_on_panic); 123 124static int stop_scheduler_on_panic = 0; 125SYSCTL_INT(_kern, OID_AUTO, stop_scheduler_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 126 &stop_scheduler_on_panic, 0, "stop scheduler upon entering panic"); 127TUNABLE_INT("kern.stop_scheduler_on_panic", &stop_scheduler_on_panic); 128 129SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 130 131#ifndef DIAGNOSTIC 132static int show_busybufs; 133#else 134static int show_busybufs = 1; 135#endif 136SYSCTL_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 */ 143const char *panicstr; 144 145int stop_scheduler; /* system stopped CPUs for panic */ 146int dumping; /* system is dumping */ 147int rebooting; /* system is rebooting */ 148static struct dumperinfo dumper; /* our selected dumper */ 149 150/* Context information for dump-debuggers. */ 151static struct pcb dumppcb; /* Registers. */ 152static lwpid_t dumptid; /* Thread ID. */ 153 154static void poweroff_wait(void *, int); 155static void shutdown_halt(void *junk, int howto); 156static void shutdown_panic(void *junk, int howto); 157static void shutdown_reset(void *junk, int howto); 158 159/* register various local shutdown events */ 160static void 161shutdown_conf(void *unused) 162{ 163 164 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 165 SHUTDOWN_PRI_FIRST); 166 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 167 SHUTDOWN_PRI_LAST + 100); 168 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 169 SHUTDOWN_PRI_LAST + 100); 170 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 171 SHUTDOWN_PRI_LAST + 200); 172} 173 174SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 175 176/* 177 * The system call that results in a reboot. 178 */ 179/* ARGSUSED */ 180int 181sys_reboot(struct thread *td, struct reboot_args *uap) 182{ 183 int error; 184 185 error = 0; 186#ifdef MAC 187 error = mac_system_check_reboot(td->td_ucred, uap->opt); 188#endif 189 if (error == 0) 190 error = priv_check(td, PRIV_REBOOT); 191 if (error == 0) { 192 mtx_lock(&Giant); 193 kern_reboot(uap->opt); 194 mtx_unlock(&Giant); 195 } 196 return (error); 197} 198 199/* 200 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 201 */ 202static int shutdown_howto = 0; 203 204void 205shutdown_nice(int howto) 206{ 207 208 shutdown_howto = howto; 209 210 /* Send a signal to init(8) and have it shutdown the world */ 211 if (initproc != NULL) { 212 PROC_LOCK(initproc); 213 kern_psignal(initproc, SIGINT); 214 PROC_UNLOCK(initproc); 215 } else { 216 /* No init(8) running, so simply reboot */ 217 kern_reboot(RB_NOSYNC); 218 } 219 return; 220} 221static int waittime = -1; 222 223static void 224print_uptime(void) 225{ 226 int f; 227 struct timespec ts; 228 229 getnanouptime(&ts); 230 printf("Uptime: "); 231 f = 0; 232 if (ts.tv_sec >= 86400) { 233 printf("%ldd", (long)ts.tv_sec / 86400); 234 ts.tv_sec %= 86400; 235 f = 1; 236 } 237 if (f || ts.tv_sec >= 3600) { 238 printf("%ldh", (long)ts.tv_sec / 3600); 239 ts.tv_sec %= 3600; 240 f = 1; 241 } 242 if (f || ts.tv_sec >= 60) { 243 printf("%ldm", (long)ts.tv_sec / 60); 244 ts.tv_sec %= 60; 245 f = 1; 246 } 247 printf("%lds\n", (long)ts.tv_sec); 248} 249 250int 251doadump(boolean_t textdump) 252{ 253 boolean_t coredump; 254 255 if (dumping) 256 return (EBUSY); 257 if (dumper.dumper == NULL) 258 return (ENXIO); 259 260 savectx(&dumppcb); 261 dumptid = curthread->td_tid; 262 dumping++; 263 264 coredump = TRUE; 265#ifdef DDB 266 if (textdump && textdump_pending) { 267 coredump = FALSE; 268 textdump_dumpsys(&dumper); 269 } 270#endif 271 if (coredump) 272 dumpsys(&dumper); 273 274 dumping--; 275 return (0); 276} 277 278static int 279isbufbusy(struct buf *bp) 280{ 281 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 282 BUF_ISLOCKED(bp)) || 283 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 284 return (1); 285 return (0); 286} 287 288/* 289 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 290 */ 291void 292kern_reboot(int howto) 293{ 294 static int first_buf_printf = 1; 295 296#if defined(SMP) 297 /* 298 * Bind us to CPU 0 so that all shutdown code runs there. Some 299 * systems don't shutdown properly (i.e., ACPI power off) if we 300 * run on another processor. 301 */ 302 if (!SCHEDULER_STOPPED()) { 303 thread_lock(curthread); 304 sched_bind(curthread, 0); 305 thread_unlock(curthread); 306 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 307 } 308#endif 309 /* We're in the process of rebooting. */ 310 rebooting = 1; 311 312 /* collect extra flags that shutdown_nice might have set */ 313 howto |= shutdown_howto; 314 315 /* We are out of the debugger now. */ 316 kdb_active = 0; 317 318 /* 319 * Do any callouts that should be done BEFORE syncing the filesystems. 320 */ 321 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 322 323 /* 324 * Now sync filesystems 325 */ 326 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 327 register struct buf *bp; 328 int iter, nbusy, pbusy; 329#ifndef PREEMPTION 330 int subiter; 331#endif 332 333 waittime = 0; 334 335#ifdef SW_WATCHDOG 336 wdog_kern_pat(WD_LASTVAL); 337#endif 338 sys_sync(curthread, NULL); 339 340 /* 341 * With soft updates, some buffers that are 342 * written will be remarked as dirty until other 343 * buffers are written. 344 */ 345 for (iter = pbusy = 0; iter < 20; iter++) { 346 nbusy = 0; 347 for (bp = &buf[nbuf]; --bp >= buf; ) 348 if (isbufbusy(bp)) 349 nbusy++; 350 if (nbusy == 0) { 351 if (first_buf_printf) 352 printf("All buffers synced."); 353 break; 354 } 355 if (first_buf_printf) { 356 printf("Syncing disks, buffers remaining... "); 357 first_buf_printf = 0; 358 } 359 printf("%d ", nbusy); 360 if (nbusy < pbusy) 361 iter = 0; 362 pbusy = nbusy; 363#ifdef SW_WATCHDOG 364 wdog_kern_pat(WD_LASTVAL); 365#endif 366 sys_sync(curthread, NULL); 367 368#ifdef PREEMPTION 369 /* 370 * Drop Giant and spin for a while to allow 371 * interrupt threads to run. 372 */ 373 DROP_GIANT(); 374 DELAY(50000 * iter); 375 PICKUP_GIANT(); 376#else 377 /* 378 * Drop Giant and context switch several times to 379 * allow interrupt threads to run. 380 */ 381 DROP_GIANT(); 382 for (subiter = 0; subiter < 50 * iter; subiter++) { 383 thread_lock(curthread); 384 mi_switch(SW_VOL, NULL); 385 thread_unlock(curthread); 386 DELAY(1000); 387 } 388 PICKUP_GIANT(); 389#endif 390 } 391 printf("\n"); 392 /* 393 * Count only busy local buffers to prevent forcing 394 * a fsck if we're just a client of a wedged NFS server 395 */ 396 nbusy = 0; 397 for (bp = &buf[nbuf]; --bp >= buf; ) { 398 if (isbufbusy(bp)) { 399#if 0 400/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 401 if (bp->b_dev == NULL) { 402 TAILQ_REMOVE(&mountlist, 403 bp->b_vp->v_mount, mnt_list); 404 continue; 405 } 406#endif 407 nbusy++; 408 if (show_busybufs > 0) { 409 printf( 410 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:", 411 nbusy, bp, bp->b_vp, bp->b_flags, 412 (intmax_t)bp->b_blkno, 413 (intmax_t)bp->b_lblkno); 414 BUF_LOCKPRINTINFO(bp); 415 if (show_busybufs > 1) 416 vn_printf(bp->b_vp, 417 "vnode content: "); 418 } 419 } 420 } 421 if (nbusy) { 422 /* 423 * Failed to sync all blocks. Indicate this and don't 424 * unmount filesystems (thus forcing an fsck on reboot). 425 */ 426 printf("Giving up on %d buffers\n", nbusy); 427 DELAY(5000000); /* 5 seconds */ 428 } else { 429 if (!first_buf_printf) 430 printf("Final sync complete\n"); 431 /* 432 * Unmount filesystems 433 */ 434 if (panicstr == 0) 435 vfs_unmountall(); 436 } 437 swapoff_all(); 438 DELAY(100000); /* wait for console output to finish */ 439 } 440 441 print_uptime(); 442 443 /* 444 * Ok, now do things that assume all filesystem activity has 445 * been completed. 446 */ 447 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 448 449 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 450 doadump(TRUE); 451 452 /* Now that we're going to really halt the system... */ 453 EVENTHANDLER_INVOKE(shutdown_final, howto); 454 455 for(;;) ; /* safety against shutdown_reset not working */ 456 /* NOTREACHED */ 457} 458 459/* 460 * If the shutdown was a clean halt, behave accordingly. 461 */ 462static void 463shutdown_halt(void *junk, int howto) 464{ 465 466 if (howto & RB_HALT) { 467 printf("\n"); 468 printf("The operating system has halted.\n"); 469 printf("Please press any key to reboot.\n\n"); 470 switch (cngetc()) { 471 case -1: /* No console, just die */ 472 cpu_halt(); 473 /* NOTREACHED */ 474 default: 475 howto &= ~RB_HALT; 476 break; 477 } 478 } 479} 480 481/* 482 * Check to see if the system paniced, pause and then reboot 483 * according to the specified delay. 484 */ 485static void 486shutdown_panic(void *junk, int howto) 487{ 488 int loop; 489 490 if (howto & RB_DUMP) { 491 if (PANIC_REBOOT_WAIT_TIME != 0) { 492 if (PANIC_REBOOT_WAIT_TIME != -1) { 493 printf("Automatic reboot in %d seconds - " 494 "press a key on the console to abort\n", 495 PANIC_REBOOT_WAIT_TIME); 496 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 497 loop > 0; --loop) { 498 DELAY(1000 * 100); /* 1/10th second */ 499 /* Did user type a key? */ 500 if (cncheckc() != -1) 501 break; 502 } 503 if (!loop) 504 return; 505 } 506 } else { /* zero time specified - reboot NOW */ 507 return; 508 } 509 printf("--> Press a key on the console to reboot,\n"); 510 printf("--> or switch off the system now.\n"); 511 cngetc(); 512 } 513} 514 515/* 516 * Everything done, now reset 517 */ 518static void 519shutdown_reset(void *junk, int howto) 520{ 521 522 printf("Rebooting...\n"); 523 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 524 525 /* 526 * Acquiring smp_ipi_mtx here has a double effect: 527 * - it disables interrupts avoiding CPU0 preemption 528 * by fast handlers (thus deadlocking against other CPUs) 529 * - it avoids deadlocks against smp_rendezvous() or, more 530 * generally, threads busy-waiting, with this spinlock held, 531 * and waiting for responses by threads on other CPUs 532 * (ie. smp_tlb_shootdown()). 533 * 534 * For the !SMP case it just needs to handle the former problem. 535 */ 536#ifdef SMP 537 mtx_lock_spin(&smp_ipi_mtx); 538#else 539 spinlock_enter(); 540#endif 541 542 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 543 cpu_reset(); 544 /* NOTREACHED */ /* assuming reset worked */ 545} 546 547/* 548 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 549 * and then reboots. If we are called twice, then we avoid trying to sync 550 * the disks as this often leads to recursive panics. 551 */ 552void 553panic(const char *fmt, ...) 554{ 555#ifdef SMP 556 static volatile u_int panic_cpu = NOCPU; 557 cpuset_t other_cpus; 558#endif 559 struct thread *td = curthread; 560 int bootopt, newpanic; 561 va_list ap; 562 static char buf[256]; 563 564 if (stop_scheduler_on_panic) 565 spinlock_enter(); 566 else 567 critical_enter(); 568 569#ifdef SMP 570 /* 571 * We don't want multiple CPU's to panic at the same time, so we 572 * use panic_cpu as a simple spinlock. We have to keep checking 573 * panic_cpu if we are spinning in case the panic on the first 574 * CPU is canceled. 575 */ 576 if (panic_cpu != PCPU_GET(cpuid)) 577 while (atomic_cmpset_int(&panic_cpu, NOCPU, 578 PCPU_GET(cpuid)) == 0) 579 while (panic_cpu != NOCPU) 580 ; /* nothing */ 581 582 if (stop_scheduler_on_panic) { 583 if (panicstr == NULL && !kdb_active) { 584 other_cpus = all_cpus; 585 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 586 stop_cpus_hard(other_cpus); 587 } 588 589 /* 590 * We set stop_scheduler here and not in the block above, 591 * because we want to ensure that if panic has been called and 592 * stop_scheduler_on_panic is true, then stop_scheduler will 593 * always be set. Even if panic has been entered from kdb. 594 */ 595 stop_scheduler = 1; 596 } 597#endif 598 599 bootopt = RB_AUTOBOOT; 600 newpanic = 0; 601 if (panicstr) 602 bootopt |= RB_NOSYNC; 603 else { 604 bootopt |= RB_DUMP; 605 panicstr = fmt; 606 newpanic = 1; 607 } 608 609 va_start(ap, fmt); 610 if (newpanic) { 611 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 612 panicstr = buf; 613 printf("panic: %s\n", buf); 614 } else { 615 printf("panic: "); 616 vprintf(fmt, ap); 617 printf("\n"); 618 } 619 va_end(ap); 620#ifdef SMP 621 printf("cpuid = %d\n", PCPU_GET(cpuid)); 622#endif 623 624#ifdef KDB 625 if (newpanic && trace_on_panic) 626 kdb_backtrace(); 627 if (debugger_on_panic) 628 kdb_enter(KDB_WHY_PANIC, "panic"); 629#endif 630 /*thread_lock(td); */ 631 td->td_flags |= TDF_INPANIC; 632 /* thread_unlock(td); */ 633 if (!sync_on_panic) 634 bootopt |= RB_NOSYNC; 635 if (!stop_scheduler_on_panic) 636 critical_exit(); 637 kern_reboot(bootopt); 638} 639 640/* 641 * Support for poweroff delay. 642 * 643 * Please note that setting this delay too short might power off your machine 644 * before the write cache on your hard disk has been flushed, leading to 645 * soft-updates inconsistencies. 646 */ 647#ifndef POWEROFF_DELAY 648# define POWEROFF_DELAY 5000 649#endif 650static int poweroff_delay = POWEROFF_DELAY; 651 652SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 653 &poweroff_delay, 0, ""); 654 655static void 656poweroff_wait(void *junk, int howto) 657{ 658 659 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 660 return; 661 DELAY(poweroff_delay * 1000); 662} 663 664/* 665 * Some system processes (e.g. syncer) need to be stopped at appropriate 666 * points in their main loops prior to a system shutdown, so that they 667 * won't interfere with the shutdown process (e.g. by holding a disk buf 668 * to cause sync to fail). For each of these system processes, register 669 * shutdown_kproc() as a handler for one of shutdown events. 670 */ 671static int kproc_shutdown_wait = 60; 672SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 673 &kproc_shutdown_wait, 0, ""); 674 675void 676kproc_shutdown(void *arg, int howto) 677{ 678 struct proc *p; 679 int error; 680 681 if (panicstr) 682 return; 683 684 p = (struct proc *)arg; 685 printf("Waiting (max %d seconds) for system process `%s' to stop...", 686 kproc_shutdown_wait, p->p_comm); 687 error = kproc_suspend(p, kproc_shutdown_wait * hz); 688 689 if (error == EWOULDBLOCK) 690 printf("timed out\n"); 691 else 692 printf("done\n"); 693} 694 695void 696kthread_shutdown(void *arg, int howto) 697{ 698 struct thread *td; 699 int error; 700 701 if (panicstr) 702 return; 703 704 td = (struct thread *)arg; 705 printf("Waiting (max %d seconds) for system thread `%s' to stop...", 706 kproc_shutdown_wait, td->td_name); 707 error = kthread_suspend(td, kproc_shutdown_wait * hz); 708 709 if (error == EWOULDBLOCK) 710 printf("timed out\n"); 711 else 712 printf("done\n"); 713} 714 715/* Registration of dumpers */ 716int 717set_dumper(struct dumperinfo *di) 718{ 719 720 if (di == NULL) { 721 bzero(&dumper, sizeof dumper); 722 return (0); 723 } 724 if (dumper.dumper != NULL) 725 return (EBUSY); 726 dumper = *di; 727 return (0); 728} 729 730/* Call dumper with bounds checking. */ 731int 732dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 733 off_t offset, size_t length) 734{ 735 736 if (length != 0 && (offset < di->mediaoffset || 737 offset - di->mediaoffset + length > di->mediasize)) { 738 printf("Attempt to write outside dump device boundaries.\n" 739 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", 740 (intmax_t)offset, (intmax_t)di->mediaoffset, 741 (uintmax_t)length, (intmax_t)di->mediasize); 742 return (ENOSPC); 743 } 744 return (di->dumper(di->priv, virtual, physical, offset, length)); 745} 746 747void 748mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 749 uint64_t dumplen, uint32_t blksz) 750{ 751 752 bzero(kdh, sizeof(*kdh)); 753 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 754 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 755 kdh->version = htod32(KERNELDUMPVERSION); 756 kdh->architectureversion = htod32(archver); 757 kdh->dumplength = htod64(dumplen); 758 kdh->dumptime = htod64(time_second); 759 kdh->blocksize = htod32(blksz); 760 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 761 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 762 if (panicstr != NULL) 763 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 764 kdh->parity = kerneldump_parity(kdh); 765} 766