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 #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 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 130 "Shutdown environment"); 131 132 #ifndef DIAGNOSTIC 133 static int show_busybufs; 134 #else 135 static int show_busybufs = 1; 136 #endif 137 SYSCTL_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 */ 144 const char *panicstr; 145 146 int dumping; /* system is dumping */ 147 int rebooting; /* system is rebooting */ 148 static struct dumperinfo dumper; /* our selected dumper */ 149 150 /* Context information for dump-debuggers. */ 151 static struct pcb dumppcb; /* Registers. */ 152 lwpid_t dumptid; /* Thread ID. */ 153 154 static void poweroff_wait(void *, int); 155 static void shutdown_halt(void *junk, int howto); 156 static void shutdown_panic(void *junk, int howto); 157 static void shutdown_reset(void *junk, int howto); 158 159 /* register various local shutdown events */ 160 static void 161 shutdown_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 } 173 174 SYSINIT(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 */ 180 int 181 sys_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 */ 202 static int shutdown_howto = 0; 203 204 void 205 shutdown_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 } 221 static int waittime = -1; 222 223 static void 224 print_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 } 249 250 int 251 doadump(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 } 277 278 static int 279 isbufbusy(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 */ 291 void 292 kern_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 wdog_kern_pat(WD_LASTVAL); 336 sys_sync(curthread, NULL); 337 338 /* 339 * With soft updates, some buffers that are 340 * written will be remarked as dirty until other 341 * buffers are written. 342 */ 343 for (iter = pbusy = 0; iter < 20; iter++) { 344 nbusy = 0; 345 for (bp = &buf[nbuf]; --bp >= buf; ) 346 if (isbufbusy(bp)) 347 nbusy++; 348 if (nbusy == 0) { 349 if (first_buf_printf) 350 printf("All buffers synced."); 351 break; 352 } 353 if (first_buf_printf) { 354 printf("Syncing disks, buffers remaining... "); 355 first_buf_printf = 0; 356 } 357 printf("%d ", nbusy); 358 if (nbusy < pbusy) 359 iter = 0; 360 pbusy = nbusy; 361 362 wdog_kern_pat(WD_LASTVAL); 363 sys_sync(curthread, NULL); 364 365 #ifdef PREEMPTION 366 /* 367 * Drop Giant and spin for a while to allow 368 * interrupt threads to run. 369 */ 370 DROP_GIANT(); 371 DELAY(50000 * iter); 372 PICKUP_GIANT(); 373 #else 374 /* 375 * Drop Giant and context switch several times to 376 * allow interrupt threads to run. 377 */ 378 DROP_GIANT(); 379 for (subiter = 0; subiter < 50 * iter; subiter++) { 380 thread_lock(curthread); 381 mi_switch(SW_VOL, NULL); 382 thread_unlock(curthread); 383 DELAY(1000); 384 } 385 PICKUP_GIANT(); 386 #endif 387 } 388 printf("\n"); 389 /* 390 * Count only busy local buffers to prevent forcing 391 * a fsck if we're just a client of a wedged NFS server 392 */ 393 nbusy = 0; 394 for (bp = &buf[nbuf]; --bp >= buf; ) { 395 if (isbufbusy(bp)) { 396 #if 0 397 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 398 if (bp->b_dev == NULL) { 399 TAILQ_REMOVE(&mountlist, 400 bp->b_vp->v_mount, mnt_list); 401 continue; 402 } 403 #endif 404 nbusy++; 405 if (show_busybufs > 0) { 406 printf( 407 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:", 408 nbusy, bp, bp->b_vp, bp->b_flags, 409 (intmax_t)bp->b_blkno, 410 (intmax_t)bp->b_lblkno); 411 BUF_LOCKPRINTINFO(bp); 412 if (show_busybufs > 1) 413 vn_printf(bp->b_vp, 414 "vnode content: "); 415 } 416 } 417 } 418 if (nbusy) { 419 /* 420 * Failed to sync all blocks. Indicate this and don't 421 * unmount filesystems (thus forcing an fsck on reboot). 422 */ 423 printf("Giving up on %d buffers\n", nbusy); 424 DELAY(5000000); /* 5 seconds */ 425 } else { 426 if (!first_buf_printf) 427 printf("Final sync complete\n"); 428 /* 429 * Unmount filesystems 430 */ 431 if (panicstr == 0) 432 vfs_unmountall(); 433 } 434 swapoff_all(); 435 DELAY(100000); /* wait for console output to finish */ 436 } 437 438 print_uptime(); 439 440 cngrab(); 441 442 /* 443 * Ok, now do things that assume all filesystem activity has 444 * been completed. 445 */ 446 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 447 448 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 449 doadump(TRUE); 450 451 /* Now that we're going to really halt the system... */ 452 EVENTHANDLER_INVOKE(shutdown_final, howto); 453 454 for(;;) ; /* safety against shutdown_reset not working */ 455 /* NOTREACHED */ 456 } 457 458 /* 459 * If the shutdown was a clean halt, behave accordingly. 460 */ 461 static void 462 shutdown_halt(void *junk, int howto) 463 { 464 465 if (howto & RB_HALT) { 466 printf("\n"); 467 printf("The operating system has halted.\n"); 468 printf("Please press any key to reboot.\n\n"); 469 switch (cngetc()) { 470 case -1: /* No console, just die */ 471 cpu_halt(); 472 /* NOTREACHED */ 473 default: 474 howto &= ~RB_HALT; 475 break; 476 } 477 } 478 } 479 480 /* 481 * Check to see if the system paniced, pause and then reboot 482 * according to the specified delay. 483 */ 484 static void 485 shutdown_panic(void *junk, int howto) 486 { 487 int loop; 488 489 if (howto & RB_DUMP) { 490 if (PANIC_REBOOT_WAIT_TIME != 0) { 491 if (PANIC_REBOOT_WAIT_TIME != -1) { 492 printf("Automatic reboot in %d seconds - " 493 "press a key on the console to abort\n", 494 PANIC_REBOOT_WAIT_TIME); 495 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 496 loop > 0; --loop) { 497 DELAY(1000 * 100); /* 1/10th second */ 498 /* Did user type a key? */ 499 if (cncheckc() != -1) 500 break; 501 } 502 if (!loop) 503 return; 504 } 505 } else { /* zero time specified - reboot NOW */ 506 return; 507 } 508 printf("--> Press a key on the console to reboot,\n"); 509 printf("--> or switch off the system now.\n"); 510 cngetc(); 511 } 512 } 513 514 /* 515 * Everything done, now reset 516 */ 517 static void 518 shutdown_reset(void *junk, int howto) 519 { 520 521 printf("Rebooting...\n"); 522 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 523 524 /* 525 * Acquiring smp_ipi_mtx here has a double effect: 526 * - it disables interrupts avoiding CPU0 preemption 527 * by fast handlers (thus deadlocking against other CPUs) 528 * - it avoids deadlocks against smp_rendezvous() or, more 529 * generally, threads busy-waiting, with this spinlock held, 530 * and waiting for responses by threads on other CPUs 531 * (ie. smp_tlb_shootdown()). 532 * 533 * For the !SMP case it just needs to handle the former problem. 534 */ 535 #ifdef SMP 536 mtx_lock_spin(&smp_ipi_mtx); 537 #else 538 spinlock_enter(); 539 #endif 540 541 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 542 cpu_reset(); 543 /* NOTREACHED */ /* assuming reset worked */ 544 } 545 546 /* 547 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 548 * and then reboots. If we are called twice, then we avoid trying to sync 549 * the disks as this often leads to recursive panics. 550 */ 551 void 552 panic(const char *fmt, ...) 553 { 554 #ifdef SMP 555 static volatile u_int panic_cpu = NOCPU; 556 cpuset_t other_cpus; 557 #endif 558 struct thread *td = curthread; 559 int bootopt, newpanic; 560 va_list ap; 561 static char buf[256]; 562 563 if (stop_scheduler_on_panic) 564 spinlock_enter(); 565 else 566 critical_enter(); 567 568 #ifdef SMP 569 /* 570 * We don't want multiple CPU's to panic at the same time, so we 571 * use panic_cpu as a simple spinlock. We have to keep checking 572 * panic_cpu if we are spinning in case the panic on the first 573 * CPU is canceled. 574 */ 575 if (panic_cpu != PCPU_GET(cpuid)) 576 while (atomic_cmpset_int(&panic_cpu, NOCPU, 577 PCPU_GET(cpuid)) == 0) 578 while (panic_cpu != NOCPU) 579 ; /* nothing */ 580 581 if (stop_scheduler_on_panic) { 582 if (panicstr == NULL && !kdb_active) { 583 other_cpus = all_cpus; 584 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 585 stop_cpus_hard(other_cpus); 586 } 587 588 /* 589 * We set stop_scheduler here and not in the block above, 590 * because we want to ensure that if panic has been called and 591 * stop_scheduler_on_panic is true, then stop_scheduler will 592 * always be set. Even if panic has been entered from kdb. 593 */ 594 td->td_stopsched = 1; 595 } 596 #endif 597 598 bootopt = RB_AUTOBOOT; 599 newpanic = 0; 600 if (panicstr) 601 bootopt |= RB_NOSYNC; 602 else { 603 bootopt |= RB_DUMP; 604 panicstr = fmt; 605 newpanic = 1; 606 } 607 608 va_start(ap, fmt); 609 if (newpanic) { 610 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 611 panicstr = buf; 612 cngrab(); 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 650 static int poweroff_delay = POWEROFF_DELAY; 651 652 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 653 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)"); 654 655 static void 656 poweroff_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 */ 671 static int kproc_shutdown_wait = 60; 672 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 673 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process"); 674 675 void 676 kproc_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 } 694 695 void 696 kthread_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 */ 716 int 717 set_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. */ 731 int 732 dump_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 } 746 747 void 748 mkdumpheader(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