b6915bdbe5
Don't count busy buffers before the initial call to sync() and don't skip the initial sync() if no busy buffers were called. Always call sync() at least once if syncing is requested. This defers the "Syncing disks, buffers remaining..." message until after the initial sync() call and the first count of busy buffers. This backs out changes in kern_shutdown 1.162. Print a different message when there are no busy buffers after the initial sync(), which is now the expected situation. Print an additional message when syncing has completed successfully in the unusual situation where the work of syncing was done by boot(). Uppercase one message to make it consistent with all of the other kernel shutdown messages. Discussed with: bde (in a much earlier form, prior to 1.162) Reviewed by: njl (in an earlier form)
637 lines
15 KiB
C
637 lines
15 KiB
C
/*-
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* Copyright (c) 1986, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_kdb.h"
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#include "opt_hw_wdog.h"
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#include "opt_mac.h"
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#include "opt_panic.h"
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#include "opt_show_busybufs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/eventhandler.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/resourcevar.h>
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#include <sys/smp.h> /* smp_active */
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#include <sys/sysctl.h>
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#include <sys/sysproto.h>
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#include <sys/vnode.h>
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#include <machine/cpu.h>
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#include <machine/pcb.h>
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#include <machine/smp.h>
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#include <sys/signalvar.h>
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#ifndef PANIC_REBOOT_WAIT_TIME
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#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
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#endif
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/*
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* Note that stdarg.h and the ANSI style va_start macro is used for both
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* ANSI and traditional C compilers.
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*/
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#include <machine/stdarg.h>
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#ifdef KDB
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#ifdef KDB_UNATTENDED
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int debugger_on_panic = 0;
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#else
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int debugger_on_panic = 1;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
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&debugger_on_panic, 0, "Run debugger on kernel panic");
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#ifdef KDB_TRACE
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int trace_on_panic = 1;
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#else
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int trace_on_panic = 0;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
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&trace_on_panic, 0, "Print stack trace on kernel panic");
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#endif /* KDB */
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int sync_on_panic = 0;
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SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
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&sync_on_panic, 0, "Do a sync before rebooting from a panic");
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SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
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#ifdef HW_WDOG
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/*
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* If there is a hardware watchdog, point this at the function needed to
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* hold it off.
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* It's needed when the kernel needs to do some lengthy operations.
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* e.g. in wd.c when dumping core.. It's most annoying to have
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* your precious core-dump only half written because the wdog kicked in.
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*/
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watchdog_tickle_fn wdog_tickler = NULL;
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#endif /* HW_WDOG */
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/*
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* Variable panicstr contains argument to first call to panic; used as flag
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* to indicate that the kernel has already called panic.
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*/
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const char *panicstr;
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int dumping; /* system is dumping */
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static struct dumperinfo dumper; /* our selected dumper */
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/* Context information for dump-debuggers. */
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static struct pcb dumppcb; /* Registers. */
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static lwpid_t dumptid; /* Thread ID. */
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static void boot(int) __dead2;
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static void poweroff_wait(void *, int);
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static void shutdown_halt(void *junk, int howto);
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static void shutdown_panic(void *junk, int howto);
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static void shutdown_reset(void *junk, int howto);
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/* register various local shutdown events */
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static void
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shutdown_conf(void *unused)
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{
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EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
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SHUTDOWN_PRI_FIRST);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
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SHUTDOWN_PRI_LAST + 100);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
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SHUTDOWN_PRI_LAST + 100);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
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SHUTDOWN_PRI_LAST + 200);
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}
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SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
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/*
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* The system call that results in a reboot
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*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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reboot(struct thread *td, struct reboot_args *uap)
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{
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int error;
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error = 0;
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#ifdef MAC
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error = mac_check_system_reboot(td->td_ucred, uap->opt);
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#endif
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if (error == 0)
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error = suser(td);
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if (error == 0) {
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mtx_lock(&Giant);
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boot(uap->opt);
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mtx_unlock(&Giant);
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}
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return (error);
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}
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/*
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* Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
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*/
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static int shutdown_howto = 0;
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void
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shutdown_nice(int howto)
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{
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shutdown_howto = howto;
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/* Send a signal to init(8) and have it shutdown the world */
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if (initproc != NULL) {
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PROC_LOCK(initproc);
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psignal(initproc, SIGINT);
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PROC_UNLOCK(initproc);
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} else {
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/* No init(8) running, so simply reboot */
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boot(RB_NOSYNC);
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}
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return;
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}
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static int waittime = -1;
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static void
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print_uptime(void)
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{
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int f;
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struct timespec ts;
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getnanouptime(&ts);
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printf("Uptime: ");
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f = 0;
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if (ts.tv_sec >= 86400) {
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printf("%ldd", (long)ts.tv_sec / 86400);
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ts.tv_sec %= 86400;
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f = 1;
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}
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if (f || ts.tv_sec >= 3600) {
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printf("%ldh", (long)ts.tv_sec / 3600);
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ts.tv_sec %= 3600;
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f = 1;
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}
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if (f || ts.tv_sec >= 60) {
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printf("%ldm", (long)ts.tv_sec / 60);
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ts.tv_sec %= 60;
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f = 1;
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}
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printf("%lds\n", (long)ts.tv_sec);
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}
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static void
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doadump(void)
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{
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/*
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* Sometimes people have to call this from the kernel debugger.
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* (if 'panic' can not dump)
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* Give them a clue as to why they can't dump.
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*/
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if (dumper.dumper == NULL) {
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printf("Cannot dump. No dump device defined.\n");
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return;
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}
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savectx(&dumppcb);
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dumptid = curthread->td_tid;
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dumping++;
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dumpsys(&dumper);
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}
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/*
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* Go through the rigmarole of shutting down..
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* this used to be in machdep.c but I'll be dammned if I could see
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* anything machine dependant in it.
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*/
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static void
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boot(int howto)
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{
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static int first_buf_printf = 1;
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/* collect extra flags that shutdown_nice might have set */
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howto |= shutdown_howto;
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/* We are out of the debugger now. */
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kdb_active = 0;
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#ifdef SMP
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if (smp_active)
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printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
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#endif
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/*
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* Do any callouts that should be done BEFORE syncing the filesystems.
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*/
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EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
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/*
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* Now sync filesystems
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*/
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if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
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register struct buf *bp;
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int iter, nbusy, pbusy;
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#ifndef PREEMPTION
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int subiter;
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#endif
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waittime = 0;
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sync(&thread0, NULL);
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/*
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* With soft updates, some buffers that are
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* written will be remarked as dirty until other
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* buffers are written.
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*/
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for (iter = pbusy = 0; iter < 20; iter++) {
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if ((bp->b_flags & B_INVAL) == 0 &&
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BUF_REFCNT(bp) > 0) {
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nbusy++;
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} else if ((bp->b_flags & (B_DELWRI | B_INVAL))
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== B_DELWRI) {
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/* bawrite(bp);*/
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nbusy++;
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}
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}
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if (nbusy == 0) {
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if (first_buf_printf)
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printf("No buffers busy after final sync");
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break;
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}
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if (first_buf_printf) {
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printf("Syncing disks, buffers remaining... ");
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first_buf_printf = 0;
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}
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printf("%d ", nbusy);
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if (nbusy < pbusy)
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iter = 0;
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pbusy = nbusy;
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sync(&thread0, NULL);
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#ifdef PREEMPTION
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/*
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* Drop Giant and spin for a while to allow
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* interrupt threads to run.
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*/
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DROP_GIANT();
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DELAY(50000 * iter);
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PICKUP_GIANT();
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#else
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/*
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* Drop Giant and context switch several times to
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* allow interrupt threads to run.
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*/
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DROP_GIANT();
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for (subiter = 0; subiter < 50 * iter; subiter++) {
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mtx_lock_spin(&sched_lock);
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mi_switch(SW_VOL, NULL);
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mtx_unlock_spin(&sched_lock);
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DELAY(1000);
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}
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PICKUP_GIANT();
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#endif
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}
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printf("\n");
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/*
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* Count only busy local buffers to prevent forcing
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* a fsck if we're just a client of a wedged NFS server
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*/
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
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((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
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if (bp->b_dev == NULL) {
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TAILQ_REMOVE(&mountlist,
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bp->b_vp->v_mount, mnt_list);
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continue;
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}
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nbusy++;
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#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
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printf(
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"%d: dev:%s, flags:%0x, blkno:%ld, lblkno:%ld\n",
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nbusy, devtoname(bp->b_dev),
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bp->b_flags, (long)bp->b_blkno,
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(long)bp->b_lblkno);
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#endif
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}
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}
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if (nbusy) {
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/*
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* Failed to sync all blocks. Indicate this and don't
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* unmount filesystems (thus forcing an fsck on reboot).
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*/
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printf("Giving up on %d buffers\n", nbusy);
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DELAY(5000000); /* 5 seconds */
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} else {
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if (!first_buf_printf)
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printf("Final sync complete\n");
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/*
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* Unmount filesystems
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*/
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if (panicstr == 0)
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vfs_unmountall();
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}
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DELAY(100000); /* wait for console output to finish */
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}
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print_uptime();
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/*
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* Ok, now do things that assume all filesystem activity has
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* been completed.
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*/
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EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
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splhigh();
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if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
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doadump();
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/* Now that we're going to really halt the system... */
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EVENTHANDLER_INVOKE(shutdown_final, howto);
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for(;;) ; /* safety against shutdown_reset not working */
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/* NOTREACHED */
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}
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/*
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* If the shutdown was a clean halt, behave accordingly.
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*/
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static void
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shutdown_halt(void *junk, int howto)
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{
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if (howto & RB_HALT) {
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printf("\n");
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printf("The operating system has halted.\n");
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printf("Please press any key to reboot.\n\n");
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switch (cngetc()) {
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case -1: /* No console, just die */
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cpu_halt();
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/* NOTREACHED */
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default:
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howto &= ~RB_HALT;
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break;
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}
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}
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}
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/*
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* Check to see if the system paniced, pause and then reboot
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* according to the specified delay.
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*/
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static void
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shutdown_panic(void *junk, int howto)
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{
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int loop;
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if (howto & RB_DUMP) {
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if (PANIC_REBOOT_WAIT_TIME != 0) {
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if (PANIC_REBOOT_WAIT_TIME != -1) {
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printf("Automatic reboot in %d seconds - "
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"press a key on the console to abort\n",
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PANIC_REBOOT_WAIT_TIME);
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for (loop = PANIC_REBOOT_WAIT_TIME * 10;
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loop > 0; --loop) {
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DELAY(1000 * 100); /* 1/10th second */
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/* Did user type a key? */
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if (cncheckc() != -1)
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break;
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}
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if (!loop)
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return;
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}
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} else { /* zero time specified - reboot NOW */
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return;
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}
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printf("--> Press a key on the console to reboot,\n");
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printf("--> or switch off the system now.\n");
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cngetc();
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}
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}
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/*
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* Everything done, now reset
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*/
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static void
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shutdown_reset(void *junk, int howto)
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{
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printf("Rebooting...\n");
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DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
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/* cpu_boot(howto); */ /* doesn't do anything at the moment */
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cpu_reset();
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/* NOTREACHED */ /* assuming reset worked */
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}
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#ifdef SMP
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static u_int panic_cpu = NOCPU;
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#endif
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/*
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* Panic is called on unresolvable fatal errors. It prints "panic: mesg",
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* and then reboots. If we are called twice, then we avoid trying to sync
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* the disks as this often leads to recursive panics.
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*
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* MPSAFE
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*/
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void
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panic(const char *fmt, ...)
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{
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struct thread *td = curthread;
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int bootopt, newpanic;
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va_list ap;
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static char buf[256];
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#ifdef SMP
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/*
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* We don't want multiple CPU's to panic at the same time, so we
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* use panic_cpu as a simple spinlock. We have to keep checking
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* panic_cpu if we are spinning in case the panic on the first
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* CPU is canceled.
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*/
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if (panic_cpu != PCPU_GET(cpuid))
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while (atomic_cmpset_int(&panic_cpu, NOCPU,
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PCPU_GET(cpuid)) == 0)
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while (panic_cpu != NOCPU)
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; /* nothing */
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#endif
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bootopt = RB_AUTOBOOT | RB_DUMP;
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newpanic = 0;
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if (panicstr)
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bootopt |= RB_NOSYNC;
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else {
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panicstr = fmt;
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newpanic = 1;
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}
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va_start(ap, fmt);
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if (newpanic) {
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(void)vsnprintf(buf, sizeof(buf), fmt, ap);
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panicstr = buf;
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printf("panic: %s\n", buf);
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} else {
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printf("panic: ");
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vprintf(fmt, ap);
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|
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;
|
|
char procname[MAXCOMLEN + 1];
|
|
int error;
|
|
|
|
if (panicstr)
|
|
return;
|
|
|
|
p = (struct proc *)arg;
|
|
strlcpy(procname, p->p_comm, sizeof(procname));
|
|
printf("Waiting (max %d seconds) for system process `%s' to stop...",
|
|
kproc_shutdown_wait, procname);
|
|
error = kthread_suspend(p, kproc_shutdown_wait * hz);
|
|
|
|
if (error == EWOULDBLOCK)
|
|
printf("timed out\n");
|
|
else
|
|
printf("done\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
|