Commit 1f4f5a22 authored by Siddharth Aggarwal's avatar Siddharth Aggarwal
Browse files

Code works for checkpointing active filesystem on s1

parent 92c4ec59
This diff is collapsed.
/*-
* 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: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $
*/
#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/eventhandler.h>
#include <sys/buf.h>
#include <sys/disklabel.h>
#include <sys/reboot.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/conf.h>
#include <sys/sysproto.h>
#include <sys/cons.h>
#include <machine/pcb.h>
#include <machine/clock.h>
#include <machine/md_var.h>
#include <machine/smp.h> /* smp_active, cpuid */
#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 __P((int)) __dead2;
static void dumpsys __P((void));
static int setdumpdev __P((dev_t dev));
static void poweroff_wait __P((void *, int));
static void print_uptime __P((void));
static void shutdown_halt __P((void *junk, int howto));
static void shutdown_panic __P((void *junk, int howto));
static void shutdown_reset __P((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(p, uap)
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) {
psignal(initproc, SIGINT);
} else {
/* No init(8) running, so simply reboot */
boot(RB_NOSYNC);
}
return;
}
static int waittime = -1;
static struct pcb dumppcb;
static void
print_uptime()
{
int f;
struct timespec ts;
getnanouptime(&ts);
printf("Uptime: ");
f = 0;
if (ts.tv_sec >= 86400) {
printf("%ldd", ts.tv_sec / 86400);
ts.tv_sec %= 86400;
f = 1;
}
if (f || ts.tv_sec >= 3600) {
printf("%ldh", ts.tv_sec / 3600);
ts.tv_sec %= 3600;
f = 1;
}
if (f || ts.tv_sec >= 60) {
printf("%ldm", ts.tv_sec / 60);
ts.tv_sec %= 60;
f = 1;
}
printf("%lds\n", ts.tv_sec);
}
void (*shdrebootp)(void);
int checkpt_flag = 0;
void sync_before_checkpoint (void)
{
register struct buf *bp;
int iter, nbusy, pbusy;
waittime = 0;
printf("\nsyncing disks... ");
checkpt_flag = 1;
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;
if (iter > 5 && bioops.io_sync)
(*bioops.io_sync)(NULL);
sync(&proc0, NULL);
DELAY(50000 * iter);
}
/*
* 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 (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);
printf ("Will force fsck on reboot\n");
DELAY(5000000); /* 5 seconds */
}
checkpt_flag = 0;
wakeup ((caddr_t)&checkpt_flag);
/*printf ("Returning from sync_before_checkpoint\n");
DELAY(1000000);*/
}
/*
* 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(howto)
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", cpuid);
}
#endif
/*
* Do any callouts that should be done BEFORE syncing the filesystems.
*/
EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
/*
* Now sync filesystems
*/
/*printf ("cold = %d, howto = %d, waittime = %d\n", cold, howto, waittime);
if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {*/
if (1) {
register struct buf *bp;
int iter, nbusy, pbusy;
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;
if (iter > 5 && bioops.io_sync)
(*bioops.io_sync)(NULL);
sync(&proc0, NULL);
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(
"%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
bp, 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 ("failed to sync all blocks. Will fsck on reboot\n");
printf("giving up on %d buffers\n", nbusy);
DELAY(5000000); /* 5 seconds */
} else {
printf("done\n");
/*
* Unmount filesystems
*/
if (panicstr == 0)
{
DELAY(10000000);
printf ("Copying blocks\n");
(*shdrebootp)();
printf ("Done!\n");
DELAY(10000000);
printf ("Unmounting filesystems...");
vfs_unmountall();
printf ("Done!\n");
}
}
DELAY(100000); /* wait for console output to finish */
}
print_uptime();
/*DELAY(10000000);
(*shdrebootp)();*/
DELAY(10000000);
/*
* 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");
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 */
}
/*
* 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)
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 __P((void *dummy));
static void
dump_conf(dummy)
void *dummy;
{
char *path;
dev_t dev;
path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
dev = getdiskbyname(path);
if (dev != NODEV)
dumpdev = dev;
}
free(path, M_TEMP);
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;
}
}