The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_shutdown.c

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    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_kdb.h"
   41 #include "opt_hw_wdog.h"
   42 #include "opt_mac.h"
   43 #include "opt_panic.h"
   44 #include "opt_show_busybufs.h"
   45 #include "opt_sched.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/bio.h>
   50 #include <sys/buf.h>
   51 #include <sys/conf.h>
   52 #include <sys/cons.h>
   53 #include <sys/eventhandler.h>
   54 #include <sys/kdb.h>
   55 #include <sys/kernel.h>
   56 #include <sys/kthread.h>
   57 #include <sys/mac.h>
   58 #include <sys/malloc.h>
   59 #include <sys/mount.h>
   60 #include <sys/proc.h>
   61 #include <sys/reboot.h>
   62 #include <sys/resourcevar.h>
   63 #include <sys/sched.h>
   64 #include <sys/smp.h>            /* smp_active */
   65 #include <sys/sysctl.h>
   66 #include <sys/sysproto.h>
   67 #include <sys/vnode.h>
   68 
   69 #include <machine/cpu.h>
   70 #include <machine/pcb.h>
   71 #include <machine/smp.h>
   72 
   73 #include <sys/signalvar.h>
   74 
   75 #ifndef PANIC_REBOOT_WAIT_TIME
   76 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   77 #endif
   78 
   79 /*
   80  * Note that stdarg.h and the ANSI style va_start macro is used for both
   81  * ANSI and traditional C compilers.
   82  */
   83 #include <machine/stdarg.h>
   84 
   85 #ifdef KDB
   86 #ifdef KDB_UNATTENDED
   87 int debugger_on_panic = 0;
   88 #else
   89 int debugger_on_panic = 1;
   90 #endif
   91 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
   92         &debugger_on_panic, 0, "Run debugger on kernel panic");
   93 
   94 #ifdef KDB_TRACE
   95 int trace_on_panic = 1;
   96 #else
   97 int trace_on_panic = 0;
   98 #endif
   99 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
  100         &trace_on_panic, 0, "Print stack trace on kernel panic");
  101 #endif /* KDB */
  102 
  103 int sync_on_panic = 0;
  104 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  105         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  106 
  107 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  108 
  109 #ifdef  HW_WDOG
  110 /*
  111  * If there is a hardware watchdog, point this at the function needed to
  112  * hold it off.
  113  * It's needed when the kernel needs to do some lengthy operations.
  114  * e.g. in wd.c when dumping core.. It's most annoying to have
  115  * your precious core-dump only half written because the wdog kicked in.
  116  */
  117 watchdog_tickle_fn wdog_tickler = NULL;
  118 #endif  /* HW_WDOG */
  119 
  120 /*
  121  * Variable panicstr contains argument to first call to panic; used as flag
  122  * to indicate that the kernel has already called panic.
  123  */
  124 const char *panicstr;
  125 
  126 int dumping;                            /* system is dumping */
  127 static struct dumperinfo dumper;        /* our selected dumper */
  128 
  129 /* Context information for dump-debuggers. */
  130 static struct pcb dumppcb;              /* Registers. */
  131 static lwpid_t dumptid;                 /* Thread ID. */
  132 
  133 static void boot(int) __dead2;
  134 static void poweroff_wait(void *, int);
  135 static void shutdown_halt(void *junk, int howto);
  136 static void shutdown_panic(void *junk, int howto);
  137 static void shutdown_reset(void *junk, int howto);
  138 
  139 /* register various local shutdown events */
  140 static void
  141 shutdown_conf(void *unused)
  142 {
  143 
  144         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  145             SHUTDOWN_PRI_FIRST);
  146         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  147             SHUTDOWN_PRI_LAST + 100);
  148         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  149             SHUTDOWN_PRI_LAST + 100);
  150         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  151             SHUTDOWN_PRI_LAST + 200);
  152 }
  153 
  154 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
  155 
  156 /*
  157  * The system call that results in a reboot
  158  *
  159  * MPSAFE
  160  */
  161 /* ARGSUSED */
  162 int
  163 reboot(struct thread *td, struct reboot_args *uap)
  164 {
  165         int error;
  166 
  167         error = 0;
  168 #ifdef MAC
  169         error = mac_check_system_reboot(td->td_ucred, uap->opt);
  170 #endif
  171         if (error == 0)
  172                 error = suser(td);
  173         if (error == 0) {
  174                 mtx_lock(&Giant);
  175                 boot(uap->opt);
  176                 mtx_unlock(&Giant);
  177         }
  178         return (error);
  179 }
  180 
  181 /*
  182  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  183  */
  184 static int shutdown_howto = 0;
  185 
  186 void
  187 shutdown_nice(int howto)
  188 {
  189 
  190         shutdown_howto = howto;
  191 
  192         /* Send a signal to init(8) and have it shutdown the world */
  193         if (initproc != NULL) {
  194                 PROC_LOCK(initproc);
  195                 psignal(initproc, SIGINT);
  196                 PROC_UNLOCK(initproc);
  197         } else {
  198                 /* No init(8) running, so simply reboot */
  199                 boot(RB_NOSYNC);
  200         }
  201         return;
  202 }
  203 static int      waittime = -1;
  204 
  205 static void
  206 print_uptime(void)
  207 {
  208         int f;
  209         struct timespec ts;
  210 
  211         getnanouptime(&ts);
  212         printf("Uptime: ");
  213         f = 0;
  214         if (ts.tv_sec >= 86400) {
  215                 printf("%ldd", (long)ts.tv_sec / 86400);
  216                 ts.tv_sec %= 86400;
  217                 f = 1;
  218         }
  219         if (f || ts.tv_sec >= 3600) {
  220                 printf("%ldh", (long)ts.tv_sec / 3600);
  221                 ts.tv_sec %= 3600;
  222                 f = 1;
  223         }
  224         if (f || ts.tv_sec >= 60) {
  225                 printf("%ldm", (long)ts.tv_sec / 60);
  226                 ts.tv_sec %= 60;
  227                 f = 1;
  228         }
  229         printf("%lds\n", (long)ts.tv_sec);
  230 }
  231 
  232 static void
  233 doadump(void)
  234 {
  235 
  236         /*
  237          * Sometimes people have to call this from the kernel debugger. 
  238          * (if 'panic' can not dump)
  239          * Give them a clue as to why they can't dump.
  240          */
  241         if (dumper.dumper == NULL) {
  242                 printf("Cannot dump. No dump device defined.\n");
  243                 return;
  244         }
  245 
  246         savectx(&dumppcb);
  247         dumptid = curthread->td_tid;
  248         dumping++;
  249         dumpsys(&dumper);
  250 }
  251 
  252 static int
  253 isbufbusy(struct buf *bp)
  254 {
  255         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  256             BUF_REFCNT(bp) > 0) ||
  257             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  258                 return (1);
  259         return (0);
  260 }
  261 
  262 /*
  263  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  264  */
  265 static void
  266 boot(int howto)
  267 {
  268         static int first_buf_printf = 1;
  269 
  270 #if defined(SMP)
  271         /*
  272          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  273          * systems don't shutdown properly (i.e., ACPI power off) if we
  274          * run on another processor.
  275          */
  276         mtx_lock_spin(&sched_lock);
  277         sched_bind(curthread, 0);
  278         mtx_unlock_spin(&sched_lock);
  279 #endif
  280 
  281         /* collect extra flags that shutdown_nice might have set */
  282         howto |= shutdown_howto;
  283 
  284         /* We are out of the debugger now. */
  285         kdb_active = 0;
  286 
  287 #ifdef SMP
  288         if (smp_active)
  289                 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
  290 #endif
  291         /*
  292          * Do any callouts that should be done BEFORE syncing the filesystems.
  293          */
  294         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  295 
  296         /* 
  297          * Now sync filesystems
  298          */
  299         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  300                 register struct buf *bp;
  301                 int iter, nbusy, pbusy;
  302 #ifndef PREEMPTION
  303                 int subiter;
  304 #endif
  305 
  306                 waittime = 0;
  307 
  308                 sync(&thread0, NULL);
  309 
  310                 /*
  311                  * With soft updates, some buffers that are
  312                  * written will be remarked as dirty until other
  313                  * buffers are written.
  314                  */
  315                 for (iter = pbusy = 0; iter < 20; iter++) {
  316                         nbusy = 0;
  317                         for (bp = &buf[nbuf]; --bp >= buf; )
  318                                 if (isbufbusy(bp))
  319                                         nbusy++;
  320                         if (nbusy == 0) {
  321                                 if (first_buf_printf)
  322                                         printf("No buffers busy after final sync");
  323                                 break;
  324                         }
  325                         if (first_buf_printf) {
  326                                 printf("Syncing disks, buffers remaining... ");
  327                                 first_buf_printf = 0;
  328                         }
  329                         printf("%d ", nbusy);
  330                         if (nbusy < pbusy)
  331                                 iter = 0;
  332                         pbusy = nbusy;
  333                         sync(&thread0, NULL);
  334 
  335 #ifdef PREEMPTION
  336                         /*
  337                          * Drop Giant and spin for a while to allow
  338                          * interrupt threads to run.
  339                          */
  340                         DROP_GIANT();
  341                         DELAY(50000 * iter);
  342                         PICKUP_GIANT();
  343 #else
  344                         /*
  345                          * Drop Giant and context switch several times to
  346                          * allow interrupt threads to run.
  347                          */
  348                         DROP_GIANT();
  349                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  350                                 mtx_lock_spin(&sched_lock);
  351                                 mi_switch(SW_VOL, NULL);
  352                                 mtx_unlock_spin(&sched_lock);
  353                                 DELAY(1000);
  354                         }
  355                         PICKUP_GIANT();
  356 #endif
  357                 }
  358                 printf("\n");
  359                 /*
  360                  * Count only busy local buffers to prevent forcing 
  361                  * a fsck if we're just a client of a wedged NFS server
  362                  */
  363                 nbusy = 0;
  364                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  365                         if (isbufbusy(bp)) {
  366                                 if (bp->b_dev == NULL) {
  367                                         TAILQ_REMOVE(&mountlist,
  368                                             bp->b_vp->v_mount, mnt_list);
  369                                         continue;
  370                                 }
  371                                 nbusy++;
  372 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  373                                 printf(
  374                             "%d: dev:%s, flags:%0x, blkno:%ld, lblkno:%ld\n",
  375                                     nbusy, devtoname(bp->b_dev),
  376                                     bp->b_flags, (long)bp->b_blkno,
  377                                     (long)bp->b_lblkno);
  378 #endif
  379                         }
  380                 }
  381                 if (nbusy) {
  382                         /*
  383                          * Failed to sync all blocks. Indicate this and don't
  384                          * unmount filesystems (thus forcing an fsck on reboot).
  385                          */
  386                         printf("Giving up on %d buffers\n", nbusy);
  387                         DELAY(5000000); /* 5 seconds */
  388                 } else {
  389                         if (!first_buf_printf)
  390                                 printf("Final sync complete\n");
  391                         /*
  392                          * Unmount filesystems
  393                          */
  394                         if (panicstr == 0)
  395                                 vfs_unmountall();
  396                 }
  397                 DELAY(100000);          /* wait for console output to finish */
  398         }
  399 
  400         print_uptime();
  401 
  402         /*
  403          * Ok, now do things that assume all filesystem activity has
  404          * been completed.
  405          */
  406         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  407 
  408         /* XXX This doesn't disable interrupts any more.  Reconsider? */
  409         splhigh();
  410 
  411         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  412                 doadump();
  413 
  414         /* Now that we're going to really halt the system... */
  415         EVENTHANDLER_INVOKE(shutdown_final, howto);
  416 
  417         for(;;) ;       /* safety against shutdown_reset not working */
  418         /* NOTREACHED */
  419 }
  420 
  421 /*
  422  * If the shutdown was a clean halt, behave accordingly.
  423  */
  424 static void
  425 shutdown_halt(void *junk, int howto)
  426 {
  427 
  428         if (howto & RB_HALT) {
  429                 printf("\n");
  430                 printf("The operating system has halted.\n");
  431                 printf("Please press any key to reboot.\n\n");
  432                 switch (cngetc()) {
  433                 case -1:                /* No console, just die */
  434                         cpu_halt();
  435                         /* NOTREACHED */
  436                 default:
  437                         howto &= ~RB_HALT;
  438                         break;
  439                 }
  440         }
  441 }
  442 
  443 /*
  444  * Check to see if the system paniced, pause and then reboot
  445  * according to the specified delay.
  446  */
  447 static void
  448 shutdown_panic(void *junk, int howto)
  449 {
  450         int loop;
  451 
  452         if (howto & RB_DUMP) {
  453                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  454                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  455                                 printf("Automatic reboot in %d seconds - "
  456                                        "press a key on the console to abort\n",
  457                                         PANIC_REBOOT_WAIT_TIME);
  458                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  459                                      loop > 0; --loop) {
  460                                         DELAY(1000 * 100); /* 1/10th second */
  461                                         /* Did user type a key? */
  462                                         if (cncheckc() != -1)
  463                                                 break;
  464                                 }
  465                                 if (!loop)
  466                                         return;
  467                         }
  468                 } else { /* zero time specified - reboot NOW */
  469                         return;
  470                 }
  471                 printf("--> Press a key on the console to reboot,\n");
  472                 printf("--> or switch off the system now.\n");
  473                 cngetc();
  474         }
  475 }
  476 
  477 /*
  478  * Everything done, now reset
  479  */
  480 static void
  481 shutdown_reset(void *junk, int howto)
  482 {
  483 
  484         printf("Rebooting...\n");
  485         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  486         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  487         cpu_reset();
  488         /* NOTREACHED */ /* assuming reset worked */
  489 }
  490 
  491 #ifdef SMP
  492 static u_int panic_cpu = NOCPU;
  493 #endif
  494 
  495 /*
  496  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  497  * and then reboots.  If we are called twice, then we avoid trying to sync
  498  * the disks as this often leads to recursive panics.
  499  *
  500  * MPSAFE
  501  */
  502 void
  503 panic(const char *fmt, ...)
  504 {
  505         struct thread *td = curthread;
  506         int bootopt, newpanic;
  507         va_list ap;
  508         static char buf[256];
  509 
  510 #ifdef SMP
  511         /*
  512          * We don't want multiple CPU's to panic at the same time, so we
  513          * use panic_cpu as a simple spinlock.  We have to keep checking
  514          * panic_cpu if we are spinning in case the panic on the first
  515          * CPU is canceled.
  516          */
  517         if (panic_cpu != PCPU_GET(cpuid))
  518                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  519                     PCPU_GET(cpuid)) == 0)
  520                         while (panic_cpu != NOCPU)
  521                                 ; /* nothing */
  522 #endif
  523 
  524         bootopt = RB_AUTOBOOT | RB_DUMP;
  525         newpanic = 0;
  526         if (panicstr)
  527                 bootopt |= RB_NOSYNC;
  528         else {
  529                 panicstr = fmt;
  530                 newpanic = 1;
  531         }
  532 
  533         va_start(ap, fmt);
  534         if (newpanic) {
  535                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  536                 panicstr = buf;
  537                 printf("panic: %s\n", buf);
  538         } else {
  539                 printf("panic: ");
  540                 vprintf(fmt, ap);
  541                 printf("\n");
  542         }
  543         va_end(ap);
  544 #ifdef SMP
  545         printf("cpuid = %d\n", PCPU_GET(cpuid));
  546 #endif
  547 
  548 #ifdef KDB
  549         if (newpanic && trace_on_panic)
  550                 kdb_backtrace();
  551         if (debugger_on_panic)
  552                 kdb_enter("panic");
  553 #ifdef RESTARTABLE_PANICS
  554         /* See if the user aborted the panic, in which case we continue. */
  555         if (panicstr == NULL) {
  556 #ifdef SMP
  557                 atomic_store_rel_int(&panic_cpu, NOCPU);
  558 #endif
  559                 return;
  560         }
  561 #endif
  562 #endif
  563         mtx_lock_spin(&sched_lock);
  564         td->td_flags |= TDF_INPANIC;
  565         mtx_unlock_spin(&sched_lock);
  566         if (!sync_on_panic)
  567                 bootopt |= RB_NOSYNC;
  568         boot(bootopt);
  569 }
  570 
  571 /*
  572  * Support for poweroff delay.
  573  */
  574 #ifndef POWEROFF_DELAY
  575 # define POWEROFF_DELAY 5000
  576 #endif
  577 static int poweroff_delay = POWEROFF_DELAY;
  578 
  579 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  580         &poweroff_delay, 0, "");
  581 
  582 static void
  583 poweroff_wait(void *junk, int howto)
  584 {
  585 
  586         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  587                 return;
  588         DELAY(poweroff_delay * 1000);
  589 }
  590 
  591 /*
  592  * Some system processes (e.g. syncer) need to be stopped at appropriate
  593  * points in their main loops prior to a system shutdown, so that they
  594  * won't interfere with the shutdown process (e.g. by holding a disk buf
  595  * to cause sync to fail).  For each of these system processes, register
  596  * shutdown_kproc() as a handler for one of shutdown events.
  597  */
  598 static int kproc_shutdown_wait = 60;
  599 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  600     &kproc_shutdown_wait, 0, "");
  601 
  602 void
  603 kproc_shutdown(void *arg, int howto)
  604 {
  605         struct proc *p;
  606         char procname[MAXCOMLEN + 1];
  607         int error;
  608 
  609         if (panicstr)
  610                 return;
  611 
  612         p = (struct proc *)arg;
  613         strlcpy(procname, p->p_comm, sizeof(procname));
  614         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  615             kproc_shutdown_wait, procname);
  616         error = kthread_suspend(p, kproc_shutdown_wait * hz);
  617 
  618         if (error == EWOULDBLOCK)
  619                 printf("timed out\n");
  620         else
  621                 printf("done\n");
  622 }
  623 
  624 /* Registration of dumpers */
  625 int
  626 set_dumper(struct dumperinfo *di)
  627 {
  628 
  629         if (di == NULL) {
  630                 bzero(&dumper, sizeof dumper);
  631                 return (0);
  632         }
  633         if (dumper.dumper != NULL)
  634                 return (EBUSY);
  635         dumper = *di;
  636         return (0);
  637 }
  638 
  639 #if defined(__powerpc__)
  640 void
  641 dumpsys(struct dumperinfo *di __unused)
  642 {
  643 
  644         printf("Kernel dumps not implemented on this architecture\n");
  645 }
  646 #endif

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