a3c257601f
label if the dump device overflaps the label (which is a slight misconfiguration). Dump routines don't use dscheck(), so the normal write protection of the label doesn't help. Reduced some nearby overflow bugs. In disk_dumpcheck(), there was (fatal but fail-safe) overflow on i386's with 4GB of memory, at least if Maxmem was the top page (can this happen?). The fix assumes that the sector size divides PAGE_SIZE (dump routines already assume this). In setdumpdev(), the corresponding overflow occurred with only about 2GB of memory on all machines with 32-bit ints. This allowed setdumpdev() to succeed when it shouldn't have, but then disk_dumpcheck() failed safe later. Except in old versions of FreeBSD like RELENG_3 where there is no disk_dumpcheck(). PR: 28164 (label clobbering part) MFC after: 1 week
653 lines
16 KiB
C
653 lines
16 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 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
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "opt_ddb.h"
|
|
#include "opt_hw_wdog.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/disklabel.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.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/pcb.h>
|
|
#include <machine/md_var.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 DDB
|
|
#ifdef DDB_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");
|
|
#endif
|
|
|
|
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 void boot(int) __dead2;
|
|
static void dumpsys(void);
|
|
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)
|
|
|
|
/* ARGSUSED */
|
|
|
|
/*
|
|
* The system call that results in a reboot
|
|
*/
|
|
int
|
|
reboot(struct proc *p, struct reboot_args *uap)
|
|
{
|
|
int error;
|
|
|
|
if ((error = suser(p)))
|
|
return (error);
|
|
|
|
boot(uap->opt);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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 struct pcb dumppcb;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
#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;
|
|
int subiter;
|
|
|
|
waittime = 0;
|
|
printf("\nsyncing disks... ");
|
|
|
|
sync(&proc0, 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(&proc0, NULL);
|
|
if (curproc != NULL) {
|
|
DROP_GIANT_NOSWITCH();
|
|
for (subiter = 0; subiter < 50 * iter; subiter++) {
|
|
mtx_lock_spin(&sched_lock);
|
|
setrunqueue(curproc);
|
|
curproc->p_stats->p_ru.ru_nvcsw++;
|
|
mi_switch(); /* Allow interrupt threads to run */
|
|
mtx_unlock_spin(&sched_lock);
|
|
DELAY(1000);
|
|
}
|
|
PICKUP_GIANT();
|
|
} else
|
|
DELAY(50000 * iter);
|
|
}
|
|
printf("\n");
|
|
/*
|
|
* 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 == NODEV) {
|
|
TAILQ_REMOVE(&mountlist,
|
|
bp->b_vp->v_mount, mnt_list);
|
|
continue;
|
|
}
|
|
nbusy++;
|
|
#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
|
|
printf(
|
|
"%d: dev:%s, flags:%08lx, 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)
|
|
dumpsys();
|
|
|
|
/* 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");
|
|
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 */
|
|
}
|
|
|
|
/*
|
|
* Magic number for savecore
|
|
*
|
|
* exported (symorder) and used at least by savecore(8)
|
|
*
|
|
*/
|
|
static u_long const dumpmag = 0x8fca0101UL;
|
|
|
|
static int dumpsize = 0; /* also for savecore */
|
|
|
|
static int dodump = 1;
|
|
|
|
SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
|
|
"Try to perform coredump on kernel panic");
|
|
|
|
static int
|
|
setdumpdev(dev_t dev)
|
|
{
|
|
int psize;
|
|
long newdumplo;
|
|
|
|
if (dev == NODEV) {
|
|
dumpdev = dev;
|
|
return (0);
|
|
}
|
|
if (devsw(dev) == NULL)
|
|
return (ENXIO); /* XXX is this right? */
|
|
if (devsw(dev)->d_psize == NULL)
|
|
return (ENXIO); /* XXX should be ENODEV ? */
|
|
psize = devsw(dev)->d_psize(dev);
|
|
if (psize == -1)
|
|
return (ENXIO); /* XXX should be ENODEV ? */
|
|
/*
|
|
* XXX should clean up checking in dumpsys() to be more like this.
|
|
*/
|
|
newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
|
|
if (newdumplo <= LABELSECTOR)
|
|
return (ENOSPC);
|
|
dumpdev = dev;
|
|
dumplo = newdumplo;
|
|
return (0);
|
|
}
|
|
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
dump_conf(void *dummy)
|
|
{
|
|
if (setdumpdev(dumpdev) != 0)
|
|
dumpdev = NODEV;
|
|
}
|
|
|
|
SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
|
|
|
|
static int
|
|
sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
udev_t ndumpdev;
|
|
|
|
ndumpdev = dev2udev(dumpdev);
|
|
error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
|
|
if (error == 0 && req->newptr != NULL)
|
|
error = setdumpdev(udev2dev(ndumpdev, 0));
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
|
|
0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
|
|
|
|
/*
|
|
* Doadump comes here after turning off memory management and
|
|
* getting on the dump stack, either when called above, or by
|
|
* the auto-restart code.
|
|
*/
|
|
static void
|
|
dumpsys(void)
|
|
{
|
|
int error;
|
|
|
|
savectx(&dumppcb);
|
|
if (dumping++) {
|
|
printf("Dump already in progress, bailing...\n");
|
|
return;
|
|
}
|
|
if (!dodump)
|
|
return;
|
|
if (dumpdev == NODEV)
|
|
return;
|
|
if (!(devsw(dumpdev)))
|
|
return;
|
|
if (!(devsw(dumpdev)->d_dump))
|
|
return;
|
|
dumpsize = Maxmem;
|
|
printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
|
|
printf("dump ");
|
|
error = (*devsw(dumpdev)->d_dump)(dumpdev);
|
|
if (error == 0) {
|
|
printf("succeeded\n");
|
|
return;
|
|
}
|
|
printf("failed, reason: ");
|
|
switch (error) {
|
|
case ENODEV:
|
|
printf("device doesn't support a dump routine\n");
|
|
break;
|
|
|
|
case ENXIO:
|
|
printf("device bad\n");
|
|
break;
|
|
|
|
case EFAULT:
|
|
printf("device not ready\n");
|
|
break;
|
|
|
|
case EINVAL:
|
|
printf("area improper\n");
|
|
break;
|
|
|
|
case EIO:
|
|
printf("i/o error\n");
|
|
break;
|
|
|
|
case EINTR:
|
|
printf("aborted from console\n");
|
|
break;
|
|
|
|
default:
|
|
printf("unknown, error = %d\n", error);
|
|
break;
|
|
}
|
|
}
|
|
|
|
int
|
|
dumpstatus(vm_offset_t addr, long count)
|
|
{
|
|
int c;
|
|
|
|
if (addr % (1024 * 1024) == 0) {
|
|
#ifdef HW_WDOG
|
|
if (wdog_tickler)
|
|
(*wdog_tickler)();
|
|
#endif
|
|
printf("%ld ", count / (1024 * 1024));
|
|
}
|
|
|
|
if ((c = cncheckc()) == 0x03)
|
|
return -1;
|
|
else if (c != -1)
|
|
printf("[CTRL-C to abort] ");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#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.
|
|
*/
|
|
void
|
|
panic(const char *fmt, ...)
|
|
{
|
|
int bootopt;
|
|
va_list ap;
|
|
static char buf[256];
|
|
|
|
#ifdef SMP
|
|
/* Only 1 CPU can panic at a time */
|
|
if (panic_cpu != PCPU_GET(cpuid) &&
|
|
atomic_cmpset_int(&panic_cpu, NOCPU, PCPU_GET(cpuid)) == 0) {
|
|
for (;;)
|
|
; /* nothing */
|
|
}
|
|
#endif
|
|
|
|
bootopt = RB_AUTOBOOT | RB_DUMP;
|
|
if (panicstr)
|
|
bootopt |= RB_NOSYNC;
|
|
else
|
|
panicstr = fmt;
|
|
|
|
va_start(ap, fmt);
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
if (panicstr == fmt)
|
|
panicstr = buf;
|
|
va_end(ap);
|
|
printf("panic: %s\n", buf);
|
|
#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);
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(DDB)
|
|
if (debugger_on_panic)
|
|
Debugger ("panic");
|
|
#endif
|
|
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");
|
|
}
|