8916adb1c9
line as the announcement. Someone should probably update the "buffers remaining" message since we now no longer should have any buffers remaining at that point.
618 lines
15 KiB
C
618 lines
15 KiB
C
/*-
|
|
* Copyright (c) 1986, 1988, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_kdb.h"
|
|
#include "opt_hw_wdog.h"
|
|
#include "opt_mac.h"
|
|
#include "opt_panic.h"
|
|
#include "opt_show_busybufs.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/cons.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/kdb.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/mac.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/smp.h> /* smp_active */
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/pcb.h>
|
|
#include <machine/smp.h>
|
|
|
|
#include <sys/signalvar.h>
|
|
|
|
#ifndef PANIC_REBOOT_WAIT_TIME
|
|
#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
|
|
#endif
|
|
|
|
/*
|
|
* Note that stdarg.h and the ANSI style va_start macro is used for both
|
|
* ANSI and traditional C compilers.
|
|
*/
|
|
#include <machine/stdarg.h>
|
|
|
|
#ifdef KDB
|
|
#ifdef KDB_UNATTENDED
|
|
int debugger_on_panic = 0;
|
|
#else
|
|
int debugger_on_panic = 1;
|
|
#endif
|
|
SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
|
|
&debugger_on_panic, 0, "Run debugger on kernel panic");
|
|
|
|
#ifdef KDB_TRACE
|
|
int trace_on_panic = 1;
|
|
#else
|
|
int trace_on_panic = 0;
|
|
#endif
|
|
SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
|
|
&trace_on_panic, 0, "Print stack trace on kernel panic");
|
|
#endif /* KDB */
|
|
|
|
int sync_on_panic = 1;
|
|
SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
|
|
&sync_on_panic, 0, "Do a sync before rebooting from a panic");
|
|
|
|
SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
|
|
|
|
#ifdef HW_WDOG
|
|
/*
|
|
* If there is a hardware watchdog, point this at the function needed to
|
|
* hold it off.
|
|
* It's needed when the kernel needs to do some lengthy operations.
|
|
* e.g. in wd.c when dumping core.. It's most annoying to have
|
|
* your precious core-dump only half written because the wdog kicked in.
|
|
*/
|
|
watchdog_tickle_fn wdog_tickler = NULL;
|
|
#endif /* HW_WDOG */
|
|
|
|
/*
|
|
* Variable panicstr contains argument to first call to panic; used as flag
|
|
* to indicate that the kernel has already called panic.
|
|
*/
|
|
const char *panicstr;
|
|
|
|
int dumping; /* system is dumping */
|
|
static struct dumperinfo dumper; /* our selected dumper */
|
|
|
|
/* Context information for dump-debuggers. */
|
|
static struct pcb dumppcb; /* Registers. */
|
|
static lwpid_t dumptid; /* Thread ID. */
|
|
|
|
static void boot(int) __dead2;
|
|
static void poweroff_wait(void *, int);
|
|
static void shutdown_halt(void *junk, int howto);
|
|
static void shutdown_panic(void *junk, int howto);
|
|
static void shutdown_reset(void *junk, int howto);
|
|
|
|
/* register various local shutdown events */
|
|
static void
|
|
shutdown_conf(void *unused)
|
|
{
|
|
|
|
EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
|
|
SHUTDOWN_PRI_FIRST);
|
|
EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
|
|
SHUTDOWN_PRI_LAST + 100);
|
|
EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
|
|
SHUTDOWN_PRI_LAST + 100);
|
|
EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
|
|
SHUTDOWN_PRI_LAST + 200);
|
|
}
|
|
|
|
SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
|
|
|
|
/*
|
|
* The system call that results in a reboot
|
|
*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
reboot(struct thread *td, struct reboot_args *uap)
|
|
{
|
|
int error;
|
|
|
|
error = 0;
|
|
#ifdef MAC
|
|
error = mac_check_system_reboot(td->td_ucred, uap->opt);
|
|
#endif
|
|
if (error == 0)
|
|
error = suser(td);
|
|
if (error == 0) {
|
|
mtx_lock(&Giant);
|
|
boot(uap->opt);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
|
|
*/
|
|
static int shutdown_howto = 0;
|
|
|
|
void
|
|
shutdown_nice(int howto)
|
|
{
|
|
|
|
shutdown_howto = howto;
|
|
|
|
/* Send a signal to init(8) and have it shutdown the world */
|
|
if (initproc != NULL) {
|
|
PROC_LOCK(initproc);
|
|
psignal(initproc, SIGINT);
|
|
PROC_UNLOCK(initproc);
|
|
} else {
|
|
/* No init(8) running, so simply reboot */
|
|
boot(RB_NOSYNC);
|
|
}
|
|
return;
|
|
}
|
|
static int waittime = -1;
|
|
|
|
static void
|
|
print_uptime(void)
|
|
{
|
|
int f;
|
|
struct timespec ts;
|
|
|
|
getnanouptime(&ts);
|
|
printf("Uptime: ");
|
|
f = 0;
|
|
if (ts.tv_sec >= 86400) {
|
|
printf("%ldd", (long)ts.tv_sec / 86400);
|
|
ts.tv_sec %= 86400;
|
|
f = 1;
|
|
}
|
|
if (f || ts.tv_sec >= 3600) {
|
|
printf("%ldh", (long)ts.tv_sec / 3600);
|
|
ts.tv_sec %= 3600;
|
|
f = 1;
|
|
}
|
|
if (f || ts.tv_sec >= 60) {
|
|
printf("%ldm", (long)ts.tv_sec / 60);
|
|
ts.tv_sec %= 60;
|
|
f = 1;
|
|
}
|
|
printf("%lds\n", (long)ts.tv_sec);
|
|
}
|
|
|
|
static void
|
|
doadump(void)
|
|
{
|
|
|
|
savectx(&dumppcb);
|
|
dumptid = curthread->td_tid;
|
|
dumping++;
|
|
dumpsys(&dumper);
|
|
}
|
|
|
|
/*
|
|
* Go through the rigmarole of shutting down..
|
|
* this used to be in machdep.c but I'll be dammned if I could see
|
|
* anything machine dependant in it.
|
|
*/
|
|
static void
|
|
boot(int howto)
|
|
{
|
|
|
|
/* collect extra flags that shutdown_nice might have set */
|
|
howto |= shutdown_howto;
|
|
|
|
/* We are out of the debugger now. */
|
|
kdb_active = 0;
|
|
|
|
#ifdef SMP
|
|
if (smp_active)
|
|
printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
|
|
#endif
|
|
/*
|
|
* Do any callouts that should be done BEFORE syncing the filesystems.
|
|
*/
|
|
EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
|
|
|
|
/*
|
|
* Now sync filesystems
|
|
*/
|
|
if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
|
|
register struct buf *bp;
|
|
int iter, nbusy, pbusy;
|
|
#ifndef PREEMPTION
|
|
int subiter;
|
|
#endif
|
|
|
|
waittime = 0;
|
|
printf("syncing disks, buffers remaining... ");
|
|
|
|
sync(&thread0, NULL);
|
|
|
|
/*
|
|
* With soft updates, some buffers that are
|
|
* written will be remarked as dirty until other
|
|
* buffers are written.
|
|
*/
|
|
for (iter = pbusy = 0; iter < 20; iter++) {
|
|
nbusy = 0;
|
|
for (bp = &buf[nbuf]; --bp >= buf; ) {
|
|
if ((bp->b_flags & B_INVAL) == 0 &&
|
|
BUF_REFCNT(bp) > 0) {
|
|
nbusy++;
|
|
} else if ((bp->b_flags & (B_DELWRI | B_INVAL))
|
|
== B_DELWRI) {
|
|
/* bawrite(bp);*/
|
|
nbusy++;
|
|
}
|
|
}
|
|
if (nbusy == 0)
|
|
break;
|
|
printf("%d ", nbusy);
|
|
if (nbusy < pbusy)
|
|
iter = 0;
|
|
pbusy = nbusy;
|
|
sync(&thread0, NULL);
|
|
|
|
#ifdef PREEMPTION
|
|
/*
|
|
* Drop Giant and spin for a while to allow
|
|
* interrupt threads to run.
|
|
*/
|
|
DROP_GIANT();
|
|
DELAY(50000 * iter);
|
|
PICKUP_GIANT();
|
|
#else
|
|
/*
|
|
* Drop Giant and context switch several times to
|
|
* allow interrupt threads to run.
|
|
*/
|
|
DROP_GIANT();
|
|
for (subiter = 0; subiter < 50 * iter; subiter++) {
|
|
mtx_lock_spin(&sched_lock);
|
|
mi_switch(SW_VOL, NULL);
|
|
mtx_unlock_spin(&sched_lock);
|
|
DELAY(1000);
|
|
}
|
|
PICKUP_GIANT();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Count only busy local buffers to prevent forcing
|
|
* a fsck if we're just a client of a wedged NFS server
|
|
*/
|
|
nbusy = 0;
|
|
for (bp = &buf[nbuf]; --bp >= buf; ) {
|
|
if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
|
|
((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
|
|
if (bp->b_dev == NULL) {
|
|
TAILQ_REMOVE(&mountlist,
|
|
bp->b_vp->v_mount, mnt_list);
|
|
continue;
|
|
}
|
|
nbusy++;
|
|
#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
|
|
printf(
|
|
"%d: dev:%s, flags:%0x, blkno:%ld, lblkno:%ld\n",
|
|
nbusy, devtoname(bp->b_dev),
|
|
bp->b_flags, (long)bp->b_blkno,
|
|
(long)bp->b_lblkno);
|
|
#endif
|
|
}
|
|
}
|
|
if (nbusy) {
|
|
/*
|
|
* Failed to sync all blocks. Indicate this and don't
|
|
* unmount filesystems (thus forcing an fsck on reboot).
|
|
*/
|
|
printf("giving up on %d buffers\n", nbusy);
|
|
DELAY(5000000); /* 5 seconds */
|
|
} else {
|
|
printf("done\n");
|
|
/*
|
|
* Unmount filesystems
|
|
*/
|
|
if (panicstr == 0)
|
|
vfs_unmountall();
|
|
}
|
|
DELAY(100000); /* wait for console output to finish */
|
|
}
|
|
|
|
print_uptime();
|
|
|
|
/*
|
|
* Ok, now do things that assume all filesystem activity has
|
|
* been completed.
|
|
*/
|
|
EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
|
|
splhigh();
|
|
if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP &&
|
|
!cold && dumper.dumper != NULL && !dumping)
|
|
doadump();
|
|
|
|
/* Now that we're going to really halt the system... */
|
|
EVENTHANDLER_INVOKE(shutdown_final, howto);
|
|
|
|
for(;;) ; /* safety against shutdown_reset not working */
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* If the shutdown was a clean halt, behave accordingly.
|
|
*/
|
|
static void
|
|
shutdown_halt(void *junk, int howto)
|
|
{
|
|
|
|
if (howto & RB_HALT) {
|
|
printf("\n");
|
|
printf("The operating system has halted.\n");
|
|
printf("Please press any key to reboot.\n\n");
|
|
switch (cngetc()) {
|
|
case -1: /* No console, just die */
|
|
cpu_halt();
|
|
/* NOTREACHED */
|
|
default:
|
|
howto &= ~RB_HALT;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check to see if the system paniced, pause and then reboot
|
|
* according to the specified delay.
|
|
*/
|
|
static void
|
|
shutdown_panic(void *junk, int howto)
|
|
{
|
|
int loop;
|
|
|
|
if (howto & RB_DUMP) {
|
|
if (PANIC_REBOOT_WAIT_TIME != 0) {
|
|
if (PANIC_REBOOT_WAIT_TIME != -1) {
|
|
printf("Automatic reboot in %d seconds - "
|
|
"press a key on the console to abort\n",
|
|
PANIC_REBOOT_WAIT_TIME);
|
|
for (loop = PANIC_REBOOT_WAIT_TIME * 10;
|
|
loop > 0; --loop) {
|
|
DELAY(1000 * 100); /* 1/10th second */
|
|
/* Did user type a key? */
|
|
if (cncheckc() != -1)
|
|
break;
|
|
}
|
|
if (!loop)
|
|
return;
|
|
}
|
|
} else { /* zero time specified - reboot NOW */
|
|
return;
|
|
}
|
|
printf("--> Press a key on the console to reboot,\n");
|
|
printf("--> or switch off the system now.\n");
|
|
cngetc();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Everything done, now reset
|
|
*/
|
|
static void
|
|
shutdown_reset(void *junk, int howto)
|
|
{
|
|
|
|
printf("Rebooting...\n");
|
|
DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
|
|
/* cpu_boot(howto); */ /* doesn't do anything at the moment */
|
|
cpu_reset();
|
|
/* NOTREACHED */ /* assuming reset worked */
|
|
}
|
|
|
|
#ifdef SMP
|
|
static u_int panic_cpu = NOCPU;
|
|
#endif
|
|
|
|
/*
|
|
* Panic is called on unresolvable fatal errors. It prints "panic: mesg",
|
|
* and then reboots. If we are called twice, then we avoid trying to sync
|
|
* the disks as this often leads to recursive panics.
|
|
*
|
|
* MPSAFE
|
|
*/
|
|
void
|
|
panic(const char *fmt, ...)
|
|
{
|
|
struct thread *td = curthread;
|
|
int bootopt, newpanic;
|
|
va_list ap;
|
|
static char buf[256];
|
|
|
|
#ifdef SMP
|
|
/*
|
|
* We don't want multiple CPU's to panic at the same time, so we
|
|
* use panic_cpu as a simple spinlock. We have to keep checking
|
|
* panic_cpu if we are spinning in case the panic on the first
|
|
* CPU is canceled.
|
|
*/
|
|
if (panic_cpu != PCPU_GET(cpuid))
|
|
while (atomic_cmpset_int(&panic_cpu, NOCPU,
|
|
PCPU_GET(cpuid)) == 0)
|
|
while (panic_cpu != NOCPU)
|
|
; /* nothing */
|
|
#endif
|
|
|
|
bootopt = RB_AUTOBOOT | RB_DUMP;
|
|
newpanic = 0;
|
|
if (panicstr)
|
|
bootopt |= RB_NOSYNC;
|
|
else {
|
|
panicstr = fmt;
|
|
newpanic = 1;
|
|
}
|
|
|
|
va_start(ap, fmt);
|
|
if (newpanic) {
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
panicstr = buf;
|
|
printf("panic: %s\n", buf);
|
|
} else {
|
|
printf("panic: ");
|
|
vprintf(fmt, ap);
|
|
printf("\n");
|
|
}
|
|
va_end(ap);
|
|
#ifdef SMP
|
|
/* two separate prints in case of an unmapped page and trap */
|
|
printf("cpuid = %d; ", PCPU_GET(cpuid));
|
|
#ifdef APIC_IO
|
|
printf("lapic.id = %08x\n", lapic.id);
|
|
#else
|
|
printf("\n");
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef KDB
|
|
if (newpanic && trace_on_panic)
|
|
kdb_backtrace();
|
|
if (debugger_on_panic)
|
|
kdb_enter("panic");
|
|
#ifdef RESTARTABLE_PANICS
|
|
/* See if the user aborted the panic, in which case we continue. */
|
|
if (panicstr == NULL) {
|
|
#ifdef SMP
|
|
atomic_store_rel_int(&panic_cpu, NOCPU);
|
|
#endif
|
|
return;
|
|
}
|
|
#endif
|
|
#endif
|
|
mtx_lock_spin(&sched_lock);
|
|
td->td_flags |= TDF_INPANIC;
|
|
mtx_unlock_spin(&sched_lock);
|
|
if (!sync_on_panic)
|
|
bootopt |= RB_NOSYNC;
|
|
boot(bootopt);
|
|
}
|
|
|
|
/*
|
|
* Support for poweroff delay.
|
|
*/
|
|
#ifndef POWEROFF_DELAY
|
|
# define POWEROFF_DELAY 5000
|
|
#endif
|
|
static int poweroff_delay = POWEROFF_DELAY;
|
|
|
|
SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
|
|
&poweroff_delay, 0, "");
|
|
|
|
static void
|
|
poweroff_wait(void *junk, int howto)
|
|
{
|
|
|
|
if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
|
|
return;
|
|
DELAY(poweroff_delay * 1000);
|
|
}
|
|
|
|
/*
|
|
* Some system processes (e.g. syncer) need to be stopped at appropriate
|
|
* points in their main loops prior to a system shutdown, so that they
|
|
* won't interfere with the shutdown process (e.g. by holding a disk buf
|
|
* to cause sync to fail). For each of these system processes, register
|
|
* shutdown_kproc() as a handler for one of shutdown events.
|
|
*/
|
|
static int kproc_shutdown_wait = 60;
|
|
SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
|
|
&kproc_shutdown_wait, 0, "");
|
|
|
|
void
|
|
kproc_shutdown(void *arg, int howto)
|
|
{
|
|
struct proc *p;
|
|
int error;
|
|
|
|
if (panicstr)
|
|
return;
|
|
|
|
p = (struct proc *)arg;
|
|
printf("Waiting (max %d seconds) for system process `%s' to stop...",
|
|
kproc_shutdown_wait, p->p_comm);
|
|
error = kthread_suspend(p, kproc_shutdown_wait * hz);
|
|
|
|
if (error == EWOULDBLOCK)
|
|
printf("timed out\n");
|
|
else
|
|
printf("stopped\n");
|
|
}
|
|
|
|
/* Registration of dumpers */
|
|
int
|
|
set_dumper(struct dumperinfo *di)
|
|
{
|
|
|
|
if (di == NULL) {
|
|
bzero(&dumper, sizeof dumper);
|
|
return (0);
|
|
}
|
|
if (dumper.dumper != NULL)
|
|
return (EBUSY);
|
|
dumper = *di;
|
|
return (0);
|
|
}
|
|
|
|
#if defined(__powerpc__)
|
|
void
|
|
dumpsys(struct dumperinfo *di __unused)
|
|
{
|
|
|
|
printf("Kernel dumps not implemented on this architecture\n");
|
|
}
|
|
#endif
|