kern_shutdown.c revision 228424
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: head/sys/kern/kern_shutdown.c 228424 2011-12-11 21:02:01Z 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 129static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 130 "Shutdown environment"); 131 132#ifndef DIAGNOSTIC 133static int show_busybufs; 134#else 135static int show_busybufs = 1; 136#endif 137SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 138 &show_busybufs, 0, ""); 139 140/* 141 * Variable panicstr contains argument to first call to panic; used as flag 142 * to indicate that the kernel has already called panic. 143 */ 144const char *panicstr; 145 146int stop_scheduler; /* system stopped CPUs for panic */ 147int dumping; /* system is dumping */ 148int rebooting; /* system is rebooting */ 149static struct dumperinfo dumper; /* our selected dumper */ 150 151/* Context information for dump-debuggers. */ 152static struct pcb dumppcb; /* Registers. */ 153static lwpid_t dumptid; /* Thread ID. */ 154 155static void poweroff_wait(void *, int); 156static void shutdown_halt(void *junk, int howto); 157static void shutdown_panic(void *junk, int howto); 158static void shutdown_reset(void *junk, int howto); 159 160/* register various local shutdown events */ 161static void 162shutdown_conf(void *unused) 163{ 164 165 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 166 SHUTDOWN_PRI_FIRST); 167 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 168 SHUTDOWN_PRI_LAST + 100); 169 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 170 SHUTDOWN_PRI_LAST + 100); 171 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 172 SHUTDOWN_PRI_LAST + 200); 173} 174 175SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 176 177/* 178 * The system call that results in a reboot. 179 */ 180/* ARGSUSED */ 181int 182sys_reboot(struct thread *td, struct reboot_args *uap) 183{ 184 int error; 185 186 error = 0; 187#ifdef MAC 188 error = mac_system_check_reboot(td->td_ucred, uap->opt); 189#endif 190 if (error == 0) 191 error = priv_check(td, PRIV_REBOOT); 192 if (error == 0) { 193 mtx_lock(&Giant); 194 kern_reboot(uap->opt); 195 mtx_unlock(&Giant); 196 } 197 return (error); 198} 199 200/* 201 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 202 */ 203static int shutdown_howto = 0; 204 205void 206shutdown_nice(int howto) 207{ 208 209 shutdown_howto = howto; 210 211 /* Send a signal to init(8) and have it shutdown the world */ 212 if (initproc != NULL) { 213 PROC_LOCK(initproc); 214 kern_psignal(initproc, SIGINT); 215 PROC_UNLOCK(initproc); 216 } else { 217 /* No init(8) running, so simply reboot */ 218 kern_reboot(RB_NOSYNC); 219 } 220 return; 221} 222static int waittime = -1; 223 224static void 225print_uptime(void) 226{ 227 int f; 228 struct timespec ts; 229 230 getnanouptime(&ts); 231 printf("Uptime: "); 232 f = 0; 233 if (ts.tv_sec >= 86400) { 234 printf("%ldd", (long)ts.tv_sec / 86400); 235 ts.tv_sec %= 86400; 236 f = 1; 237 } 238 if (f || ts.tv_sec >= 3600) { 239 printf("%ldh", (long)ts.tv_sec / 3600); 240 ts.tv_sec %= 3600; 241 f = 1; 242 } 243 if (f || ts.tv_sec >= 60) { 244 printf("%ldm", (long)ts.tv_sec / 60); 245 ts.tv_sec %= 60; 246 f = 1; 247 } 248 printf("%lds\n", (long)ts.tv_sec); 249} 250 251int 252doadump(boolean_t textdump) 253{ 254 boolean_t coredump; 255 256 if (dumping) 257 return (EBUSY); 258 if (dumper.dumper == NULL) 259 return (ENXIO); 260 261 savectx(&dumppcb); 262 dumptid = curthread->td_tid; 263 dumping++; 264 265 coredump = TRUE; 266#ifdef DDB 267 if (textdump && textdump_pending) { 268 coredump = FALSE; 269 textdump_dumpsys(&dumper); 270 } 271#endif 272 if (coredump) 273 dumpsys(&dumper); 274 275 dumping--; 276 return (0); 277} 278 279static int 280isbufbusy(struct buf *bp) 281{ 282 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 283 BUF_ISLOCKED(bp)) || 284 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 285 return (1); 286 return (0); 287} 288 289/* 290 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 291 */ 292void 293kern_reboot(int howto) 294{ 295 static int first_buf_printf = 1; 296 297#if defined(SMP) 298 /* 299 * Bind us to CPU 0 so that all shutdown code runs there. Some 300 * systems don't shutdown properly (i.e., ACPI power off) if we 301 * run on another processor. 302 */ 303 if (!SCHEDULER_STOPPED()) { 304 thread_lock(curthread); 305 sched_bind(curthread, 0); 306 thread_unlock(curthread); 307 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 308 } 309#endif 310 /* We're in the process of rebooting. */ 311 rebooting = 1; 312 313 /* collect extra flags that shutdown_nice might have set */ 314 howto |= shutdown_howto; 315 316 /* We are out of the debugger now. */ 317 kdb_active = 0; 318 319 /* 320 * Do any callouts that should be done BEFORE syncing the filesystems. 321 */ 322 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 323 324 /* 325 * Now sync filesystems 326 */ 327 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 328 register struct buf *bp; 329 int iter, nbusy, pbusy; 330#ifndef PREEMPTION 331 int subiter; 332#endif 333 334 waittime = 0; 335 336#ifdef SW_WATCHDOG 337 wdog_kern_pat(WD_LASTVAL); 338#endif 339 sys_sync(curthread, NULL); 340 341 /* 342 * With soft updates, some buffers that are 343 * written will be remarked as dirty until other 344 * buffers are written. 345 */ 346 for (iter = pbusy = 0; iter < 20; iter++) { 347 nbusy = 0; 348 for (bp = &buf[nbuf]; --bp >= buf; ) 349 if (isbufbusy(bp)) 350 nbusy++; 351 if (nbusy == 0) { 352 if (first_buf_printf) 353 printf("All buffers synced."); 354 break; 355 } 356 if (first_buf_printf) { 357 printf("Syncing disks, buffers remaining... "); 358 first_buf_printf = 0; 359 } 360 printf("%d ", nbusy); 361 if (nbusy < pbusy) 362 iter = 0; 363 pbusy = nbusy; 364#ifdef SW_WATCHDOG 365 wdog_kern_pat(WD_LASTVAL); 366#endif 367 sys_sync(curthread, NULL); 368 369#ifdef PREEMPTION 370 /* 371 * Drop Giant and spin for a while to allow 372 * interrupt threads to run. 373 */ 374 DROP_GIANT(); 375 DELAY(50000 * iter); 376 PICKUP_GIANT(); 377#else 378 /* 379 * Drop Giant and context switch several times to 380 * allow interrupt threads to run. 381 */ 382 DROP_GIANT(); 383 for (subiter = 0; subiter < 50 * iter; subiter++) { 384 thread_lock(curthread); 385 mi_switch(SW_VOL, NULL); 386 thread_unlock(curthread); 387 DELAY(1000); 388 } 389 PICKUP_GIANT(); 390#endif 391 } 392 printf("\n"); 393 /* 394 * Count only busy local buffers to prevent forcing 395 * a fsck if we're just a client of a wedged NFS server 396 */ 397 nbusy = 0; 398 for (bp = &buf[nbuf]; --bp >= buf; ) { 399 if (isbufbusy(bp)) { 400#if 0 401/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 402 if (bp->b_dev == NULL) { 403 TAILQ_REMOVE(&mountlist, 404 bp->b_vp->v_mount, mnt_list); 405 continue; 406 } 407#endif 408 nbusy++; 409 if (show_busybufs > 0) { 410 printf( 411 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:", 412 nbusy, bp, bp->b_vp, bp->b_flags, 413 (intmax_t)bp->b_blkno, 414 (intmax_t)bp->b_lblkno); 415 BUF_LOCKPRINTINFO(bp); 416 if (show_busybufs > 1) 417 vn_printf(bp->b_vp, 418 "vnode content: "); 419 } 420 } 421 } 422 if (nbusy) { 423 /* 424 * Failed to sync all blocks. Indicate this and don't 425 * unmount filesystems (thus forcing an fsck on reboot). 426 */ 427 printf("Giving up on %d buffers\n", nbusy); 428 DELAY(5000000); /* 5 seconds */ 429 } else { 430 if (!first_buf_printf) 431 printf("Final sync complete\n"); 432 /* 433 * Unmount filesystems 434 */ 435 if (panicstr == 0) 436 vfs_unmountall(); 437 } 438 swapoff_all(); 439 DELAY(100000); /* wait for console output to finish */ 440 } 441 442 print_uptime(); 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 stop_scheduler = 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 printf("panic: %s\n", buf); 615 } else { 616 printf("panic: "); 617 vprintf(fmt, ap); 618 printf("\n"); 619 } 620 va_end(ap); 621#ifdef SMP 622 printf("cpuid = %d\n", PCPU_GET(cpuid)); 623#endif 624 625#ifdef KDB 626 if (newpanic && trace_on_panic) 627 kdb_backtrace(); 628 if (debugger_on_panic) 629 kdb_enter(KDB_WHY_PANIC, "panic"); 630#endif 631 /*thread_lock(td); */ 632 td->td_flags |= TDF_INPANIC; 633 /* thread_unlock(td); */ 634 if (!sync_on_panic) 635 bootopt |= RB_NOSYNC; 636 if (!stop_scheduler_on_panic) 637 critical_exit(); 638 kern_reboot(bootopt); 639} 640 641/* 642 * Support for poweroff delay. 643 * 644 * Please note that setting this delay too short might power off your machine 645 * before the write cache on your hard disk has been flushed, leading to 646 * soft-updates inconsistencies. 647 */ 648#ifndef POWEROFF_DELAY 649# define POWEROFF_DELAY 5000 650#endif 651static int poweroff_delay = POWEROFF_DELAY; 652 653SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 654 &poweroff_delay, 0, ""); 655 656static void 657poweroff_wait(void *junk, int howto) 658{ 659 660 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 661 return; 662 DELAY(poweroff_delay * 1000); 663} 664 665/* 666 * Some system processes (e.g. syncer) need to be stopped at appropriate 667 * points in their main loops prior to a system shutdown, so that they 668 * won't interfere with the shutdown process (e.g. by holding a disk buf 669 * to cause sync to fail). For each of these system processes, register 670 * shutdown_kproc() as a handler for one of shutdown events. 671 */ 672static int kproc_shutdown_wait = 60; 673SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 674 &kproc_shutdown_wait, 0, ""); 675 676void 677kproc_shutdown(void *arg, int howto) 678{ 679 struct proc *p; 680 int error; 681 682 if (panicstr) 683 return; 684 685 p = (struct proc *)arg; 686 printf("Waiting (max %d seconds) for system process `%s' to stop...", 687 kproc_shutdown_wait, p->p_comm); 688 error = kproc_suspend(p, kproc_shutdown_wait * hz); 689 690 if (error == EWOULDBLOCK) 691 printf("timed out\n"); 692 else 693 printf("done\n"); 694} 695 696void 697kthread_shutdown(void *arg, int howto) 698{ 699 struct thread *td; 700 int error; 701 702 if (panicstr) 703 return; 704 705 td = (struct thread *)arg; 706 printf("Waiting (max %d seconds) for system thread `%s' to stop...", 707 kproc_shutdown_wait, td->td_name); 708 error = kthread_suspend(td, kproc_shutdown_wait * hz); 709 710 if (error == EWOULDBLOCK) 711 printf("timed out\n"); 712 else 713 printf("done\n"); 714} 715 716/* Registration of dumpers */ 717int 718set_dumper(struct dumperinfo *di) 719{ 720 721 if (di == NULL) { 722 bzero(&dumper, sizeof dumper); 723 return (0); 724 } 725 if (dumper.dumper != NULL) 726 return (EBUSY); 727 dumper = *di; 728 return (0); 729} 730 731/* Call dumper with bounds checking. */ 732int 733dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 734 off_t offset, size_t length) 735{ 736 737 if (length != 0 && (offset < di->mediaoffset || 738 offset - di->mediaoffset + length > di->mediasize)) { 739 printf("Attempt to write outside dump device boundaries.\n" 740 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", 741 (intmax_t)offset, (intmax_t)di->mediaoffset, 742 (uintmax_t)length, (intmax_t)di->mediasize); 743 return (ENOSPC); 744 } 745 return (di->dumper(di->priv, virtual, physical, offset, length)); 746} 747 748void 749mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 750 uint64_t dumplen, uint32_t blksz) 751{ 752 753 bzero(kdh, sizeof(*kdh)); 754 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 755 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 756 kdh->version = htod32(KERNELDUMPVERSION); 757 kdh->architectureversion = htod32(archver); 758 kdh->dumplength = htod64(dumplen); 759 kdh->dumptime = htod64(time_second); 760 kdh->blocksize = htod32(blksz); 761 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 762 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 763 if (panicstr != NULL) 764 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 765 kdh->parity = kerneldump_parity(kdh); 766} 767