67812eacd7
lockmgr locks. This commit should be functionally equivalent to the old semantics. That is, all buffer locking is done with LK_EXCLUSIVE requests. Changes to take advantage of LK_SHARED and LK_RECURSIVE will be done in future commits.
561 lines
14 KiB
C
561 lines
14 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* $Id: kern_shutdown.c,v 1.52 1999/05/12 22:30:46 peter Exp $
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*/
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#include "opt_ddb.h"
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#include "opt_hw_wdog.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/buf.h>
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#include <sys/reboot.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/conf.h>
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#include <sys/sysproto.h>
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#include <machine/pcb.h>
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#include <machine/clock.h>
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#include <machine/cons.h>
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#include <machine/md_var.h>
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#ifdef SMP
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#include <machine/smp.h> /* smp_active, cpuid */
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#endif
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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 DDB
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#ifdef DDB_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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#endif
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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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/*
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* callout list for things to do a shutdown
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*/
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typedef struct shutdown_list_element {
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LIST_ENTRY(shutdown_list_element) links;
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bootlist_fn function;
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void *arg;
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int priority;
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} *sle_p;
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/*
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* There are three shutdown lists. Some things need to be shut down
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* earlier than others.
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*/
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LIST_HEAD(shutdown_list, shutdown_list_element);
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static struct shutdown_list shutdown_lists[SHUTDOWN_FINAL + 1];
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static void boot __P((int)) __dead2;
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static void dumpsys __P((void));
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#ifndef _SYS_SYSPROTO_H_
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struct reboot_args {
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int opt;
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};
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#endif
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/* ARGSUSED */
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/*
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* The system call that results in a reboot
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*/
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int
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reboot(p, uap)
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struct proc *p;
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struct reboot_args *uap;
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{
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int error;
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if ((error = suser(p)))
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return (error);
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boot(uap->opt);
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return (0);
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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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void
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shutdown_nice()
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{
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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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psignal(initproc, SIGINT);
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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 struct pcb dumppcb;
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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(howto)
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int howto;
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{
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sle_p ep;
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#ifdef SMP
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if (smp_active) {
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printf("boot() called on cpu#%d\n", cpuid);
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}
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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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LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_PRE_SYNC], links)
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(*ep->function)(howto, ep->arg);
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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;
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waittime = 0;
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printf("\nsyncing disks... ");
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sync(&proc0, 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 = 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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break;
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printf("%d ", nbusy);
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sync(&proc0, NULL);
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DELAY(50000 * iter);
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}
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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 == NODEV)
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CIRCLEQ_REMOVE(&mountlist,
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bp->b_vp->v_mount, mnt_list);
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else
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nbusy++;
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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\n");
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#ifdef SHOW_BUSYBUFS
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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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printf(
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"%d: dev:%08lx, flags:%08lx, blkno:%ld, lblkno:%ld\n",
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nbusy, (u_long)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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}
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}
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DELAY(5000000); /* 5 seconds */
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#endif
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} else {
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printf("done\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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/*
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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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LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_POST_SYNC], links)
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(*ep->function)(howto, ep->arg);
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splhigh();
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if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) {
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savectx(&dumppcb);
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#ifdef __i386__
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dumppcb.pcb_cr3 = rcr3();
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#endif
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dumpsys();
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}
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/* Now that we're going to really halt the system... */
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LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_FINAL], links)
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(*ep->function)(howto, ep->arg);
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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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} else if (howto & RB_DUMP) {
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/* System Paniced */
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if (PANIC_REBOOT_WAIT_TIME != 0) {
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if (PANIC_REBOOT_WAIT_TIME != -1) {
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int loop;
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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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goto die;
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}
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} else { /* zero time specified - reboot NOW */
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goto die;
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}
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printf("--> Press a key on the console to reboot <--\n");
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cngetc();
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}
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die:
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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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for(;;) ;
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/* NOTREACHED */
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}
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/*
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* Magic number for savecore
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*
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* exported (symorder) and used at least by savecore(8)
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*
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*/
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static u_long const dumpmag = 0x8fca0101UL;
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static int dumpsize = 0; /* also for savecore */
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static int dodump = 1;
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SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW,
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&dodump, 0, "Do coredump on kernel panic");
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/* ARGSUSED */
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static void dump_conf __P((void *dummy));
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static void
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dump_conf(dummy)
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void *dummy;
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{
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cpu_dumpconf();
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}
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SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
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/*
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* Doadump comes here after turning off memory management and
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* getting on the dump stack, either when called above, or by
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* the auto-restart code.
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*/
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static void
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dumpsys(void)
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{
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if (!dodump)
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return;
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if (dumpdev == NODEV)
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return;
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if (!(bdevsw(dumpdev)))
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return;
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if (!(bdevsw(dumpdev)->d_dump))
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return;
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dumpsize = Maxmem;
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printf("\ndumping to dev (%d,%d), offset %ld\n",
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major(dumpdev), minor(dumpdev), dumplo);
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printf("dump ");
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switch ((*bdevsw(dumpdev)->d_dump)(dumpdev)) {
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case ENXIO:
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printf("device bad\n");
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break;
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case EFAULT:
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printf("device not ready\n");
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break;
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case EINVAL:
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printf("area improper\n");
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break;
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case EIO:
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printf("i/o error\n");
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break;
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case EINTR:
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printf("aborted from console\n");
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break;
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default:
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printf("succeeded\n");
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break;
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}
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}
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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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void
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panic(const char *fmt, ...)
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{
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int bootopt;
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va_list ap;
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static char buf[256];
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bootopt = RB_AUTOBOOT | RB_DUMP;
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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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va_start(ap, fmt);
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(void)vsnprintf(buf, sizeof(buf), fmt, ap);
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if (panicstr == fmt)
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panicstr = buf;
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va_end(ap);
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printf("panic: %s\n", buf);
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#ifdef SMP
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/* three seperate prints in case of an unmapped page and trap */
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printf("mp_lock = %08x; ", mp_lock);
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printf("cpuid = %d; ", cpuid);
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printf("lapic.id = %08x\n", lapic.id);
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#endif
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#if defined(DDB)
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if (debugger_on_panic)
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Debugger ("panic");
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#endif
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boot(bootopt);
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}
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/*
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* Three routines to handle adding/deleting items on the
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* shutdown callout lists
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*
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* at_shutdown():
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* Take the arguments given and put them onto the shutdown callout list.
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* However first make sure that it's not already there.
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* returns 0 on success.
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*/
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int
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at_shutdown(bootlist_fn function, void *arg, int queue)
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{
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return(at_shutdown_pri(function, arg, queue, SHUTDOWN_PRI_DEFAULT));
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}
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/*
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* at_shutdown_pri():
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* Take the arguments given and put them onto the shutdown callout list
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* with the given execution priority.
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* returns 0 on success.
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*/
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int
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at_shutdown_pri(bootlist_fn function, void *arg, int queue, int pri)
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{
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sle_p op, ep, ip;
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if (queue < SHUTDOWN_PRE_SYNC
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|| queue > SHUTDOWN_FINAL) {
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printf("at_shutdown: bad exit callout queue %d specified\n",
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queue);
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return (EINVAL);
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}
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if (rm_at_shutdown(function, arg))
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printf("at_shutdown: exit callout entry was already present\n");
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ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT);
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if (ep == NULL)
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return (ENOMEM);
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ep->function = function;
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ep->arg = arg;
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ep->priority = pri;
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/* Sort into list of items on this queue */
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ip = LIST_FIRST(&shutdown_lists[queue]);
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if (ip == NULL) {
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LIST_INSERT_HEAD(&shutdown_lists[queue], ep, links);
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} else {
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for (; ip != NULL; op = ip, ip = LIST_NEXT(ip, links)) {
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if (ep->priority < ip->priority) {
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LIST_INSERT_BEFORE(ip, ep, links);
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ep = NULL;
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break;
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}
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}
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if (ep != NULL)
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LIST_INSERT_AFTER(op, ep, links);
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}
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return (0);
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}
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/*
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* Scan the exit callout lists for the given items and remove them.
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* Returns the number of items removed.
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*/
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int
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rm_at_shutdown(bootlist_fn function, void *arg)
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{
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sle_p ep;
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int count;
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int queue;
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count = 0;
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for (queue = SHUTDOWN_PRE_SYNC; queue < SHUTDOWN_FINAL; queue++) {
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LIST_FOREACH(ep, &shutdown_lists[queue], links) {
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if ((ep->function == function) && (ep->arg == arg)) {
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LIST_REMOVE(ep, links);
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free(ep, M_TEMP);
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count++;
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}
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}
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}
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return (count);
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}
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/*
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|
* Support for poweroff delay.
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|
*/
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static int poweroff_delay = 0;
|
|
SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
|
|
&poweroff_delay, 0, "");
|
|
|
|
static void poweroff_wait(int howto, void *unused)
|
|
{
|
|
if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
|
|
return;
|
|
DELAY(poweroff_delay * 1000);
|
|
}
|
|
|
|
/*
|
|
* XXX OK? This implies I know SHUTDOWN_PRI_LAST > SHUTDOWN_PRI_FIRST
|
|
*/
|
|
static void poweroff_conf(void *unused)
|
|
{
|
|
at_shutdown_pri(poweroff_wait, NULL, SHUTDOWN_FINAL, SHUTDOWN_PRI_FIRST);
|
|
}
|
|
|
|
SYSINIT(poweroff_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, poweroff_conf, NULL)
|