kern_shutdown.c revision 235480
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 235480 2012-05-15 17:21:46Z 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 = 1; 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 dumping; /* system is dumping */ 146int rebooting; /* system is rebooting */ 147static struct dumperinfo dumper; /* our selected dumper */ 148 149/* Context information for dump-debuggers. */ 150static struct pcb dumppcb; /* Registers. */ 151static lwpid_t dumptid; /* Thread ID. */ 152 153static void poweroff_wait(void *, int); 154static void shutdown_halt(void *junk, int howto); 155static void shutdown_panic(void *junk, int howto); 156static void shutdown_reset(void *junk, int howto); 157 158/* register various local shutdown events */ 159static void 160shutdown_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 173SYSINIT(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 */ 179int 180sys_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 */ 201static int shutdown_howto = 0; 202 203void 204shutdown_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} 220static int waittime = -1; 221 222static void 223print_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 249int 250doadump(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 277static int 278isbufbusy(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 */ 290void 291kern_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#ifdef SW_WATCHDOG 335 wdog_kern_pat(WD_LASTVAL); 336#endif 337 sys_sync(curthread, NULL); 338 339 /* 340 * With soft updates, some buffers that are 341 * written will be remarked as dirty until other 342 * buffers are written. 343 */ 344 for (iter = pbusy = 0; iter < 20; iter++) { 345 nbusy = 0; 346 for (bp = &buf[nbuf]; --bp >= buf; ) 347 if (isbufbusy(bp)) 348 nbusy++; 349 if (nbusy == 0) { 350 if (first_buf_printf) 351 printf("All buffers synced."); 352 break; 353 } 354 if (first_buf_printf) { 355 printf("Syncing disks, buffers remaining... "); 356 first_buf_printf = 0; 357 } 358 printf("%d ", nbusy); 359 if (nbusy < pbusy) 360 iter = 0; 361 pbusy = nbusy; 362#ifdef SW_WATCHDOG 363 wdog_kern_pat(WD_LASTVAL); 364#endif 365 sys_sync(curthread, NULL); 366 367#ifdef PREEMPTION 368 /* 369 * Drop Giant and spin for a while to allow 370 * interrupt threads to run. 371 */ 372 DROP_GIANT(); 373 DELAY(50000 * iter); 374 PICKUP_GIANT(); 375#else 376 /* 377 * Drop Giant and context switch several times to 378 * allow interrupt threads to run. 379 */ 380 DROP_GIANT(); 381 for (subiter = 0; subiter < 50 * iter; subiter++) { 382 thread_lock(curthread); 383 mi_switch(SW_VOL, NULL); 384 thread_unlock(curthread); 385 DELAY(1000); 386 } 387 PICKUP_GIANT(); 388#endif 389 } 390 printf("\n"); 391 /* 392 * Count only busy local buffers to prevent forcing 393 * a fsck if we're just a client of a wedged NFS server 394 */ 395 nbusy = 0; 396 for (bp = &buf[nbuf]; --bp >= buf; ) { 397 if (isbufbusy(bp)) { 398#if 0 399/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 400 if (bp->b_dev == NULL) { 401 TAILQ_REMOVE(&mountlist, 402 bp->b_vp->v_mount, mnt_list); 403 continue; 404 } 405#endif 406 nbusy++; 407 if (show_busybufs > 0) { 408 printf( 409 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:", 410 nbusy, bp, bp->b_vp, bp->b_flags, 411 (intmax_t)bp->b_blkno, 412 (intmax_t)bp->b_lblkno); 413 BUF_LOCKPRINTINFO(bp); 414 if (show_busybufs > 1) 415 vn_printf(bp->b_vp, 416 "vnode content: "); 417 } 418 } 419 } 420 if (nbusy) { 421 /* 422 * Failed to sync all blocks. Indicate this and don't 423 * unmount filesystems (thus forcing an fsck on reboot). 424 */ 425 printf("Giving up on %d buffers\n", nbusy); 426 DELAY(5000000); /* 5 seconds */ 427 } else { 428 if (!first_buf_printf) 429 printf("Final sync complete\n"); 430 /* 431 * Unmount filesystems 432 */ 433 if (panicstr == 0) 434 vfs_unmountall(); 435 } 436 swapoff_all(); 437 DELAY(100000); /* wait for console output to finish */ 438 } 439 440 print_uptime(); 441 442 cngrab(); 443 444 /* 445 * Ok, now do things that assume all filesystem activity has 446 * been completed. 447 */ 448 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 449 450 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 451 doadump(TRUE); 452 453 /* Now that we're going to really halt the system... */ 454 EVENTHANDLER_INVOKE(shutdown_final, howto); 455 456 for(;;) ; /* safety against shutdown_reset not working */ 457 /* NOTREACHED */ 458} 459 460/* 461 * If the shutdown was a clean halt, behave accordingly. 462 */ 463static void 464shutdown_halt(void *junk, int howto) 465{ 466 467 if (howto & RB_HALT) { 468 printf("\n"); 469 printf("The operating system has halted.\n"); 470 printf("Please press any key to reboot.\n\n"); 471 switch (cngetc()) { 472 case -1: /* No console, just die */ 473 cpu_halt(); 474 /* NOTREACHED */ 475 default: 476 howto &= ~RB_HALT; 477 break; 478 } 479 } 480} 481 482/* 483 * Check to see if the system paniced, pause and then reboot 484 * according to the specified delay. 485 */ 486static void 487shutdown_panic(void *junk, int howto) 488{ 489 int loop; 490 491 if (howto & RB_DUMP) { 492 if (PANIC_REBOOT_WAIT_TIME != 0) { 493 if (PANIC_REBOOT_WAIT_TIME != -1) { 494 printf("Automatic reboot in %d seconds - " 495 "press a key on the console to abort\n", 496 PANIC_REBOOT_WAIT_TIME); 497 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 498 loop > 0; --loop) { 499 DELAY(1000 * 100); /* 1/10th second */ 500 /* Did user type a key? */ 501 if (cncheckc() != -1) 502 break; 503 } 504 if (!loop) 505 return; 506 } 507 } else { /* zero time specified - reboot NOW */ 508 return; 509 } 510 printf("--> Press a key on the console to reboot,\n"); 511 printf("--> or switch off the system now.\n"); 512 cngetc(); 513 } 514} 515 516/* 517 * Everything done, now reset 518 */ 519static void 520shutdown_reset(void *junk, int howto) 521{ 522 523 printf("Rebooting...\n"); 524 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 525 526 /* 527 * Acquiring smp_ipi_mtx here has a double effect: 528 * - it disables interrupts avoiding CPU0 preemption 529 * by fast handlers (thus deadlocking against other CPUs) 530 * - it avoids deadlocks against smp_rendezvous() or, more 531 * generally, threads busy-waiting, with this spinlock held, 532 * and waiting for responses by threads on other CPUs 533 * (ie. smp_tlb_shootdown()). 534 * 535 * For the !SMP case it just needs to handle the former problem. 536 */ 537#ifdef SMP 538 mtx_lock_spin(&smp_ipi_mtx); 539#else 540 spinlock_enter(); 541#endif 542 543 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 544 cpu_reset(); 545 /* NOTREACHED */ /* assuming reset worked */ 546} 547 548/* 549 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 550 * and then reboots. If we are called twice, then we avoid trying to sync 551 * the disks as this often leads to recursive panics. 552 */ 553void 554panic(const char *fmt, ...) 555{ 556#ifdef SMP 557 static volatile u_int panic_cpu = NOCPU; 558 cpuset_t other_cpus; 559#endif 560 struct thread *td = curthread; 561 int bootopt, newpanic; 562 va_list ap; 563 static char buf[256]; 564 565 if (stop_scheduler_on_panic) 566 spinlock_enter(); 567 else 568 critical_enter(); 569 570#ifdef SMP 571 /* 572 * We don't want multiple CPU's to panic at the same time, so we 573 * use panic_cpu as a simple spinlock. We have to keep checking 574 * panic_cpu if we are spinning in case the panic on the first 575 * CPU is canceled. 576 */ 577 if (panic_cpu != PCPU_GET(cpuid)) 578 while (atomic_cmpset_int(&panic_cpu, NOCPU, 579 PCPU_GET(cpuid)) == 0) 580 while (panic_cpu != NOCPU) 581 ; /* nothing */ 582 583 if (stop_scheduler_on_panic) { 584 if (panicstr == NULL && !kdb_active) { 585 other_cpus = all_cpus; 586 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 587 stop_cpus_hard(other_cpus); 588 } 589 590 /* 591 * We set stop_scheduler here and not in the block above, 592 * because we want to ensure that if panic has been called and 593 * stop_scheduler_on_panic is true, then stop_scheduler will 594 * always be set. Even if panic has been entered from kdb. 595 */ 596 td->td_stopsched = 1; 597 } 598#endif 599 600 bootopt = RB_AUTOBOOT; 601 newpanic = 0; 602 if (panicstr) 603 bootopt |= RB_NOSYNC; 604 else { 605 bootopt |= RB_DUMP; 606 panicstr = fmt; 607 newpanic = 1; 608 } 609 610 va_start(ap, fmt); 611 if (newpanic) { 612 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 613 panicstr = buf; 614 cngrab(); 615 printf("panic: %s\n", buf); 616 } else { 617 printf("panic: "); 618 vprintf(fmt, ap); 619 printf("\n"); 620 } 621 va_end(ap); 622#ifdef SMP 623 printf("cpuid = %d\n", PCPU_GET(cpuid)); 624#endif 625 626#ifdef KDB 627 if (newpanic && trace_on_panic) 628 kdb_backtrace(); 629 if (debugger_on_panic) 630 kdb_enter(KDB_WHY_PANIC, "panic"); 631#endif 632 /*thread_lock(td); */ 633 td->td_flags |= TDF_INPANIC; 634 /* thread_unlock(td); */ 635 if (!sync_on_panic) 636 bootopt |= RB_NOSYNC; 637 if (!stop_scheduler_on_panic) 638 critical_exit(); 639 kern_reboot(bootopt); 640} 641 642/* 643 * Support for poweroff delay. 644 * 645 * Please note that setting this delay too short might power off your machine 646 * before the write cache on your hard disk has been flushed, leading to 647 * soft-updates inconsistencies. 648 */ 649#ifndef POWEROFF_DELAY 650# define POWEROFF_DELAY 5000 651#endif 652static int poweroff_delay = POWEROFF_DELAY; 653 654SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 655 &poweroff_delay, 0, ""); 656 657static void 658poweroff_wait(void *junk, int howto) 659{ 660 661 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 662 return; 663 DELAY(poweroff_delay * 1000); 664} 665 666/* 667 * Some system processes (e.g. syncer) need to be stopped at appropriate 668 * points in their main loops prior to a system shutdown, so that they 669 * won't interfere with the shutdown process (e.g. by holding a disk buf 670 * to cause sync to fail). For each of these system processes, register 671 * shutdown_kproc() as a handler for one of shutdown events. 672 */ 673static int kproc_shutdown_wait = 60; 674SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 675 &kproc_shutdown_wait, 0, ""); 676 677void 678kproc_shutdown(void *arg, int howto) 679{ 680 struct proc *p; 681 int error; 682 683 if (panicstr) 684 return; 685 686 p = (struct proc *)arg; 687 printf("Waiting (max %d seconds) for system process `%s' to stop...", 688 kproc_shutdown_wait, p->p_comm); 689 error = kproc_suspend(p, kproc_shutdown_wait * hz); 690 691 if (error == EWOULDBLOCK) 692 printf("timed out\n"); 693 else 694 printf("done\n"); 695} 696 697void 698kthread_shutdown(void *arg, int howto) 699{ 700 struct thread *td; 701 int error; 702 703 if (panicstr) 704 return; 705 706 td = (struct thread *)arg; 707 printf("Waiting (max %d seconds) for system thread `%s' to stop...", 708 kproc_shutdown_wait, td->td_name); 709 error = kthread_suspend(td, kproc_shutdown_wait * hz); 710 711 if (error == EWOULDBLOCK) 712 printf("timed out\n"); 713 else 714 printf("done\n"); 715} 716 717/* Registration of dumpers */ 718int 719set_dumper(struct dumperinfo *di) 720{ 721 722 if (di == NULL) { 723 bzero(&dumper, sizeof dumper); 724 return (0); 725 } 726 if (dumper.dumper != NULL) 727 return (EBUSY); 728 dumper = *di; 729 return (0); 730} 731 732/* Call dumper with bounds checking. */ 733int 734dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 735 off_t offset, size_t length) 736{ 737 738 if (length != 0 && (offset < di->mediaoffset || 739 offset - di->mediaoffset + length > di->mediasize)) { 740 printf("Attempt to write outside dump device boundaries.\n" 741 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", 742 (intmax_t)offset, (intmax_t)di->mediaoffset, 743 (uintmax_t)length, (intmax_t)di->mediasize); 744 return (ENOSPC); 745 } 746 return (di->dumper(di->priv, virtual, physical, offset, length)); 747} 748 749void 750mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 751 uint64_t dumplen, uint32_t blksz) 752{ 753 754 bzero(kdh, sizeof(*kdh)); 755 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 756 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 757 kdh->version = htod32(KERNELDUMPVERSION); 758 kdh->architectureversion = htod32(archver); 759 kdh->dumplength = htod64(dumplen); 760 kdh->dumptime = htod64(time_second); 761 kdh->blocksize = htod32(blksz); 762 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 763 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 764 if (panicstr != NULL) 765 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 766 kdh->parity = kerneldump_parity(kdh); 767} 768