1/*-
2 * Copyright (c) 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
35 */
36
37#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 1986, 1988, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
35 */
36
37#include <sys/cdefs.h>
|
38__FBSDID("$FreeBSD: head/sys/kern/kern_shutdown.c 130164 2004-06-06 21:26:49Z phk $");
| 38__FBSDID("$FreeBSD: head/sys/kern/kern_shutdown.c 130640 2004-06-17 17:16:53Z phk $");
|
39
40#include "opt_ddb.h"
41#include "opt_ddb_trace.h"
42#include "opt_ddb_unattended.h"
43#include "opt_hw_wdog.h"
44#include "opt_mac.h"
45#include "opt_panic.h"
46#include "opt_show_busybufs.h"
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/bio.h>
51#include <sys/buf.h>
52#include <sys/conf.h>
53#include <sys/cons.h>
54#include <sys/eventhandler.h>
55#include <sys/kernel.h>
56#include <sys/kthread.h>
57#include <sys/mac.h>
58#include <sys/malloc.h>
59#include <sys/mount.h>
60#include <sys/proc.h>
61#include <sys/reboot.h>
62#include <sys/resourcevar.h>
63#include <sys/smp.h> /* smp_active */
64#include <sys/sysctl.h>
65#include <sys/sysproto.h>
66#include <sys/vnode.h>
67
68#include <machine/cpu.h>
69#include <machine/pcb.h>
70#include <machine/smp.h>
71
72#include <sys/signalvar.h>
73#ifdef DDB
74#include <ddb/ddb.h>
75#endif
76
77#ifndef PANIC_REBOOT_WAIT_TIME
78#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
79#endif
80
81/*
82 * Note that stdarg.h and the ANSI style va_start macro is used for both
83 * ANSI and traditional C compilers.
84 */
85#include <machine/stdarg.h>
86
87#ifdef DDB
88#ifdef DDB_UNATTENDED
89int debugger_on_panic = 0;
90#else
91int debugger_on_panic = 1;
92#endif
93SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
94 &debugger_on_panic, 0, "Run debugger on kernel panic");
95
96#ifdef DDB_TRACE
97int trace_on_panic = 1;
98#else
99int trace_on_panic = 0;
100#endif
101SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
102 &trace_on_panic, 0, "Print stack trace on kernel panic");
103#endif
104
105int sync_on_panic = 1;
106SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
107 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
108
109SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
110
111#ifdef HW_WDOG
112/*
113 * If there is a hardware watchdog, point this at the function needed to
114 * hold it off.
115 * It's needed when the kernel needs to do some lengthy operations.
116 * e.g. in wd.c when dumping core.. It's most annoying to have
117 * your precious core-dump only half written because the wdog kicked in.
118 */
119watchdog_tickle_fn wdog_tickler = NULL;
120#endif /* HW_WDOG */
121
122/*
123 * Variable panicstr contains argument to first call to panic; used as flag
124 * to indicate that the kernel has already called panic.
125 */
126const char *panicstr;
127
128int dumping; /* system is dumping */
129static struct dumperinfo dumper; /* our selected dumper */
130static struct pcb dumppcb; /* "You Are Here" sign for dump-debuggers */
131
132static void boot(int) __dead2;
133static void poweroff_wait(void *, int);
134static void shutdown_halt(void *junk, int howto);
135static void shutdown_panic(void *junk, int howto);
136static void shutdown_reset(void *junk, int howto);
137
138/* register various local shutdown events */
139static void
140shutdown_conf(void *unused)
141{
142
143 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
144 SHUTDOWN_PRI_FIRST);
145 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
146 SHUTDOWN_PRI_LAST + 100);
147 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
148 SHUTDOWN_PRI_LAST + 100);
149 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
150 SHUTDOWN_PRI_LAST + 200);
151}
152
153SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
154
155/*
156 * The system call that results in a reboot
157 *
158 * MPSAFE
159 */
160/* ARGSUSED */
161int
162reboot(struct thread *td, struct reboot_args *uap)
163{
164 int error;
165
166 error = 0;
167#ifdef MAC
168 error = mac_check_system_reboot(td->td_ucred, uap->opt);
169#endif
170 if (error == 0)
171 error = suser(td);
172 if (error == 0) {
173 mtx_lock(&Giant);
174 boot(uap->opt);
175 mtx_unlock(&Giant);
176 }
177 return (error);
178}
179
180/*
181 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
182 */
183static int shutdown_howto = 0;
184
185void
186shutdown_nice(int howto)
187{
188
189 shutdown_howto = howto;
190
191 /* Send a signal to init(8) and have it shutdown the world */
192 if (initproc != NULL) {
193 PROC_LOCK(initproc);
194 psignal(initproc, SIGINT);
195 PROC_UNLOCK(initproc);
196 } else {
197 /* No init(8) running, so simply reboot */
198 boot(RB_NOSYNC);
199 }
200 return;
201}
202static int waittime = -1;
203
204static void
205print_uptime(void)
206{
207 int f;
208 struct timespec ts;
209
210 getnanouptime(&ts);
211 printf("Uptime: ");
212 f = 0;
213 if (ts.tv_sec >= 86400) {
214 printf("%ldd", (long)ts.tv_sec / 86400);
215 ts.tv_sec %= 86400;
216 f = 1;
217 }
218 if (f || ts.tv_sec >= 3600) {
219 printf("%ldh", (long)ts.tv_sec / 3600);
220 ts.tv_sec %= 3600;
221 f = 1;
222 }
223 if (f || ts.tv_sec >= 60) {
224 printf("%ldm", (long)ts.tv_sec / 60);
225 ts.tv_sec %= 60;
226 f = 1;
227 }
228 printf("%lds\n", (long)ts.tv_sec);
229}
230
231static void
232doadump(void)
233{
234
235 savectx(&dumppcb);
236 dumping++;
237 dumpsys(&dumper);
238}
239
240/*
241 * Go through the rigmarole of shutting down..
242 * this used to be in machdep.c but I'll be dammned if I could see
243 * anything machine dependant in it.
244 */
245static void
246boot(int howto)
247{
248
249 /* collect extra flags that shutdown_nice might have set */
250 howto |= shutdown_howto;
251
252#ifdef DDB
253 /* We are out of the debugger now. */
254 db_active = 0;
255#endif
256
257#ifdef SMP
258 if (smp_active)
259 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
260#endif
261 /*
262 * Do any callouts that should be done BEFORE syncing the filesystems.
263 */
264 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
265
266 /*
267 * Now sync filesystems
268 */
269 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
270 register struct buf *bp;
271 int iter, nbusy, pbusy;
272 int subiter;
273
274 waittime = 0;
275 printf("\nsyncing disks, buffers remaining... ");
276
277 sync(&thread0, NULL);
278
279 /*
280 * With soft updates, some buffers that are
281 * written will be remarked as dirty until other
282 * buffers are written.
283 */
284 for (iter = pbusy = 0; iter < 20; iter++) {
285 nbusy = 0;
286 for (bp = &buf[nbuf]; --bp >= buf; ) {
287 if ((bp->b_flags & B_INVAL) == 0 &&
288 BUF_REFCNT(bp) > 0) {
289 nbusy++;
290 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
291 == B_DELWRI) {
292 /* bawrite(bp);*/
293 nbusy++;
294 }
295 }
296 if (nbusy == 0)
297 break;
298 printf("%d ", nbusy);
299 if (nbusy < pbusy)
300 iter = 0;
301 pbusy = nbusy;
302 sync(&thread0, NULL);
303 if (curthread != NULL) {
304 DROP_GIANT();
305 for (subiter = 0; subiter < 50 * iter; subiter++) {
306 mtx_lock_spin(&sched_lock);
307 /*
308 * Allow interrupt threads to run
309 */
310 mi_switch(SW_VOL);
311 mtx_unlock_spin(&sched_lock);
312 DELAY(1000);
313 }
314 PICKUP_GIANT();
315 } else
316 DELAY(50000 * iter);
317 }
318 printf("\n");
319 /*
320 * Count only busy local buffers to prevent forcing
321 * a fsck if we're just a client of a wedged NFS server
322 */
323 nbusy = 0;
324 for (bp = &buf[nbuf]; --bp >= buf; ) {
325 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
326 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
| 39
40#include "opt_ddb.h"
41#include "opt_ddb_trace.h"
42#include "opt_ddb_unattended.h"
43#include "opt_hw_wdog.h"
44#include "opt_mac.h"
45#include "opt_panic.h"
46#include "opt_show_busybufs.h"
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/bio.h>
51#include <sys/buf.h>
52#include <sys/conf.h>
53#include <sys/cons.h>
54#include <sys/eventhandler.h>
55#include <sys/kernel.h>
56#include <sys/kthread.h>
57#include <sys/mac.h>
58#include <sys/malloc.h>
59#include <sys/mount.h>
60#include <sys/proc.h>
61#include <sys/reboot.h>
62#include <sys/resourcevar.h>
63#include <sys/smp.h> /* smp_active */
64#include <sys/sysctl.h>
65#include <sys/sysproto.h>
66#include <sys/vnode.h>
67
68#include <machine/cpu.h>
69#include <machine/pcb.h>
70#include <machine/smp.h>
71
72#include <sys/signalvar.h>
73#ifdef DDB
74#include <ddb/ddb.h>
75#endif
76
77#ifndef PANIC_REBOOT_WAIT_TIME
78#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
79#endif
80
81/*
82 * Note that stdarg.h and the ANSI style va_start macro is used for both
83 * ANSI and traditional C compilers.
84 */
85#include <machine/stdarg.h>
86
87#ifdef DDB
88#ifdef DDB_UNATTENDED
89int debugger_on_panic = 0;
90#else
91int debugger_on_panic = 1;
92#endif
93SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
94 &debugger_on_panic, 0, "Run debugger on kernel panic");
95
96#ifdef DDB_TRACE
97int trace_on_panic = 1;
98#else
99int trace_on_panic = 0;
100#endif
101SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
102 &trace_on_panic, 0, "Print stack trace on kernel panic");
103#endif
104
105int sync_on_panic = 1;
106SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
107 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
108
109SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
110
111#ifdef HW_WDOG
112/*
113 * If there is a hardware watchdog, point this at the function needed to
114 * hold it off.
115 * It's needed when the kernel needs to do some lengthy operations.
116 * e.g. in wd.c when dumping core.. It's most annoying to have
117 * your precious core-dump only half written because the wdog kicked in.
118 */
119watchdog_tickle_fn wdog_tickler = NULL;
120#endif /* HW_WDOG */
121
122/*
123 * Variable panicstr contains argument to first call to panic; used as flag
124 * to indicate that the kernel has already called panic.
125 */
126const char *panicstr;
127
128int dumping; /* system is dumping */
129static struct dumperinfo dumper; /* our selected dumper */
130static struct pcb dumppcb; /* "You Are Here" sign for dump-debuggers */
131
132static void boot(int) __dead2;
133static void poweroff_wait(void *, int);
134static void shutdown_halt(void *junk, int howto);
135static void shutdown_panic(void *junk, int howto);
136static void shutdown_reset(void *junk, int howto);
137
138/* register various local shutdown events */
139static void
140shutdown_conf(void *unused)
141{
142
143 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
144 SHUTDOWN_PRI_FIRST);
145 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
146 SHUTDOWN_PRI_LAST + 100);
147 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
148 SHUTDOWN_PRI_LAST + 100);
149 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
150 SHUTDOWN_PRI_LAST + 200);
151}
152
153SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
154
155/*
156 * The system call that results in a reboot
157 *
158 * MPSAFE
159 */
160/* ARGSUSED */
161int
162reboot(struct thread *td, struct reboot_args *uap)
163{
164 int error;
165
166 error = 0;
167#ifdef MAC
168 error = mac_check_system_reboot(td->td_ucred, uap->opt);
169#endif
170 if (error == 0)
171 error = suser(td);
172 if (error == 0) {
173 mtx_lock(&Giant);
174 boot(uap->opt);
175 mtx_unlock(&Giant);
176 }
177 return (error);
178}
179
180/*
181 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
182 */
183static int shutdown_howto = 0;
184
185void
186shutdown_nice(int howto)
187{
188
189 shutdown_howto = howto;
190
191 /* Send a signal to init(8) and have it shutdown the world */
192 if (initproc != NULL) {
193 PROC_LOCK(initproc);
194 psignal(initproc, SIGINT);
195 PROC_UNLOCK(initproc);
196 } else {
197 /* No init(8) running, so simply reboot */
198 boot(RB_NOSYNC);
199 }
200 return;
201}
202static int waittime = -1;
203
204static void
205print_uptime(void)
206{
207 int f;
208 struct timespec ts;
209
210 getnanouptime(&ts);
211 printf("Uptime: ");
212 f = 0;
213 if (ts.tv_sec >= 86400) {
214 printf("%ldd", (long)ts.tv_sec / 86400);
215 ts.tv_sec %= 86400;
216 f = 1;
217 }
218 if (f || ts.tv_sec >= 3600) {
219 printf("%ldh", (long)ts.tv_sec / 3600);
220 ts.tv_sec %= 3600;
221 f = 1;
222 }
223 if (f || ts.tv_sec >= 60) {
224 printf("%ldm", (long)ts.tv_sec / 60);
225 ts.tv_sec %= 60;
226 f = 1;
227 }
228 printf("%lds\n", (long)ts.tv_sec);
229}
230
231static void
232doadump(void)
233{
234
235 savectx(&dumppcb);
236 dumping++;
237 dumpsys(&dumper);
238}
239
240/*
241 * Go through the rigmarole of shutting down..
242 * this used to be in machdep.c but I'll be dammned if I could see
243 * anything machine dependant in it.
244 */
245static void
246boot(int howto)
247{
248
249 /* collect extra flags that shutdown_nice might have set */
250 howto |= shutdown_howto;
251
252#ifdef DDB
253 /* We are out of the debugger now. */
254 db_active = 0;
255#endif
256
257#ifdef SMP
258 if (smp_active)
259 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
260#endif
261 /*
262 * Do any callouts that should be done BEFORE syncing the filesystems.
263 */
264 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
265
266 /*
267 * Now sync filesystems
268 */
269 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
270 register struct buf *bp;
271 int iter, nbusy, pbusy;
272 int subiter;
273
274 waittime = 0;
275 printf("\nsyncing disks, buffers remaining... ");
276
277 sync(&thread0, NULL);
278
279 /*
280 * With soft updates, some buffers that are
281 * written will be remarked as dirty until other
282 * buffers are written.
283 */
284 for (iter = pbusy = 0; iter < 20; iter++) {
285 nbusy = 0;
286 for (bp = &buf[nbuf]; --bp >= buf; ) {
287 if ((bp->b_flags & B_INVAL) == 0 &&
288 BUF_REFCNT(bp) > 0) {
289 nbusy++;
290 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
291 == B_DELWRI) {
292 /* bawrite(bp);*/
293 nbusy++;
294 }
295 }
296 if (nbusy == 0)
297 break;
298 printf("%d ", nbusy);
299 if (nbusy < pbusy)
300 iter = 0;
301 pbusy = nbusy;
302 sync(&thread0, NULL);
303 if (curthread != NULL) {
304 DROP_GIANT();
305 for (subiter = 0; subiter < 50 * iter; subiter++) {
306 mtx_lock_spin(&sched_lock);
307 /*
308 * Allow interrupt threads to run
309 */
310 mi_switch(SW_VOL);
311 mtx_unlock_spin(&sched_lock);
312 DELAY(1000);
313 }
314 PICKUP_GIANT();
315 } else
316 DELAY(50000 * iter);
317 }
318 printf("\n");
319 /*
320 * Count only busy local buffers to prevent forcing
321 * a fsck if we're just a client of a wedged NFS server
322 */
323 nbusy = 0;
324 for (bp = &buf[nbuf]; --bp >= buf; ) {
325 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
326 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
|
327 if (bp->b_dev == NODEV) {
| 327 if (bp->b_dev == NULL) {
|
328 TAILQ_REMOVE(&mountlist,
329 bp->b_vp->v_mount, mnt_list);
330 continue;
331 }
332 nbusy++;
333#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
334 printf(
335 "%d: dev:%s, flags:%0x, blkno:%ld, lblkno:%ld\n",
336 nbusy, devtoname(bp->b_dev),
337 bp->b_flags, (long)bp->b_blkno,
338 (long)bp->b_lblkno);
339#endif
340 }
341 }
342 if (nbusy) {
343 /*
344 * Failed to sync all blocks. Indicate this and don't
345 * unmount filesystems (thus forcing an fsck on reboot).
346 */
347 printf("giving up on %d buffers\n", nbusy);
348 DELAY(5000000); /* 5 seconds */
349 } else {
350 printf("done\n");
351 /*
352 * Unmount filesystems
353 */
354 if (panicstr == 0)
355 vfs_unmountall();
356 }
357 DELAY(100000); /* wait for console output to finish */
358 }
359
360 print_uptime();
361
362 /*
363 * Ok, now do things that assume all filesystem activity has
364 * been completed.
365 */
366 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
367 splhigh();
368 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP &&
369 !cold && dumper.dumper != NULL && !dumping)
370 doadump();
371
372 /* Now that we're going to really halt the system... */
373 EVENTHANDLER_INVOKE(shutdown_final, howto);
374
375 for(;;) ; /* safety against shutdown_reset not working */
376 /* NOTREACHED */
377}
378
379/*
380 * If the shutdown was a clean halt, behave accordingly.
381 */
382static void
383shutdown_halt(void *junk, int howto)
384{
385
386 if (howto & RB_HALT) {
387 printf("\n");
388 printf("The operating system has halted.\n");
389 printf("Please press any key to reboot.\n\n");
390 switch (cngetc()) {
391 case -1: /* No console, just die */
392 cpu_halt();
393 /* NOTREACHED */
394 default:
395 howto &= ~RB_HALT;
396 break;
397 }
398 }
399}
400
401/*
402 * Check to see if the system paniced, pause and then reboot
403 * according to the specified delay.
404 */
405static void
406shutdown_panic(void *junk, int howto)
407{
408 int loop;
409
410 if (howto & RB_DUMP) {
411 if (PANIC_REBOOT_WAIT_TIME != 0) {
412 if (PANIC_REBOOT_WAIT_TIME != -1) {
413 printf("Automatic reboot in %d seconds - "
414 "press a key on the console to abort\n",
415 PANIC_REBOOT_WAIT_TIME);
416 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
417 loop > 0; --loop) {
418 DELAY(1000 * 100); /* 1/10th second */
419 /* Did user type a key? */
420 if (cncheckc() != -1)
421 break;
422 }
423 if (!loop)
424 return;
425 }
426 } else { /* zero time specified - reboot NOW */
427 return;
428 }
429 printf("--> Press a key on the console to reboot,\n");
430 printf("--> or switch off the system now.\n");
431 cngetc();
432 }
433}
434
435/*
436 * Everything done, now reset
437 */
438static void
439shutdown_reset(void *junk, int howto)
440{
441
442 printf("Rebooting...\n");
443 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
444 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
445 cpu_reset();
446 /* NOTREACHED */ /* assuming reset worked */
447}
448
449/*
450 * Print a backtrace if we can.
451 */
452
453void
454backtrace(void)
455{
456
457#ifdef DDB
458 printf("Stack backtrace:\n");
459 db_print_backtrace();
460#else
461 printf("Sorry, need DDB option to print backtrace");
462#endif
463}
464
465#ifdef SMP
466static u_int panic_cpu = NOCPU;
467#endif
468
469/*
470 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
471 * and then reboots. If we are called twice, then we avoid trying to sync
472 * the disks as this often leads to recursive panics.
473 *
474 * MPSAFE
475 */
476void
477panic(const char *fmt, ...)
478{
479 struct thread *td = curthread;
480 int bootopt, newpanic;
481 va_list ap;
482 static char buf[256];
483
484#ifdef SMP
485 /*
486 * We don't want multiple CPU's to panic at the same time, so we
487 * use panic_cpu as a simple spinlock. We have to keep checking
488 * panic_cpu if we are spinning in case the panic on the first
489 * CPU is canceled.
490 */
491 if (panic_cpu != PCPU_GET(cpuid))
492 while (atomic_cmpset_int(&panic_cpu, NOCPU,
493 PCPU_GET(cpuid)) == 0)
494 while (panic_cpu != NOCPU)
495 ; /* nothing */
496#endif
497
498 bootopt = RB_AUTOBOOT | RB_DUMP;
499 newpanic = 0;
500 if (panicstr)
501 bootopt |= RB_NOSYNC;
502 else {
503 panicstr = fmt;
504 newpanic = 1;
505 }
506
507 va_start(ap, fmt);
508 if (newpanic) {
509 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
510 panicstr = buf;
511 printf("panic: %s\n", buf);
512 } else {
513 printf("panic: ");
514 vprintf(fmt, ap);
515 printf("\n");
516 }
517 va_end(ap);
518#ifdef SMP
519 /* two separate prints in case of an unmapped page and trap */
520 printf("cpuid = %d; ", PCPU_GET(cpuid));
521#ifdef APIC_IO
522 printf("lapic.id = %08x\n", lapic.id);
523#else
524 printf("\n");
525#endif
526#endif
527
528#if defined(DDB)
529 if (newpanic && trace_on_panic)
530 backtrace();
531 if (debugger_on_panic)
532 Debugger ("panic");
533#ifdef RESTARTABLE_PANICS
534 /* See if the user aborted the panic, in which case we continue. */
535 if (panicstr == NULL) {
536#ifdef SMP
537 atomic_store_rel_int(&panic_cpu, NOCPU);
538#endif
539 return;
540 }
541#endif
542#endif
543 mtx_lock_spin(&sched_lock);
544 td->td_flags |= TDF_INPANIC;
545 mtx_unlock_spin(&sched_lock);
546 if (!sync_on_panic)
547 bootopt |= RB_NOSYNC;
548 boot(bootopt);
549}
550
551/*
552 * Support for poweroff delay.
553 */
554#ifndef POWEROFF_DELAY
555# define POWEROFF_DELAY 5000
556#endif
557static int poweroff_delay = POWEROFF_DELAY;
558
559SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
560 &poweroff_delay, 0, "");
561
562static void
563poweroff_wait(void *junk, int howto)
564{
565
566 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
567 return;
568 DELAY(poweroff_delay * 1000);
569}
570
571/*
572 * Some system processes (e.g. syncer) need to be stopped at appropriate
573 * points in their main loops prior to a system shutdown, so that they
574 * won't interfere with the shutdown process (e.g. by holding a disk buf
575 * to cause sync to fail). For each of these system processes, register
576 * shutdown_kproc() as a handler for one of shutdown events.
577 */
578static int kproc_shutdown_wait = 60;
579SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
580 &kproc_shutdown_wait, 0, "");
581
582void
583kproc_shutdown(void *arg, int howto)
584{
585 struct proc *p;
586 int error;
587
588 if (panicstr)
589 return;
590
591 p = (struct proc *)arg;
592 printf("Waiting (max %d seconds) for system process `%s' to stop...",
593 kproc_shutdown_wait, p->p_comm);
594 error = kthread_suspend(p, kproc_shutdown_wait * hz);
595
596 if (error == EWOULDBLOCK)
597 printf("timed out\n");
598 else
599 printf("stopped\n");
600}
601
602/* Registration of dumpers */
603int
604set_dumper(struct dumperinfo *di)
605{
606
607 if (di == NULL) {
608 bzero(&dumper, sizeof dumper);
609 return (0);
610 }
611 if (dumper.dumper != NULL)
612 return (EBUSY);
613 dumper = *di;
614 return (0);
615}
616
617#if defined(__powerpc__)
618void
619dumpsys(struct dumperinfo *di __unused)
620{
621
622 printf("Kernel dumps not implemented on this architecture\n");
623}
624#endif
| 328 TAILQ_REMOVE(&mountlist,
329 bp->b_vp->v_mount, mnt_list);
330 continue;
331 }
332 nbusy++;
333#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
334 printf(
335 "%d: dev:%s, flags:%0x, blkno:%ld, lblkno:%ld\n",
336 nbusy, devtoname(bp->b_dev),
337 bp->b_flags, (long)bp->b_blkno,
338 (long)bp->b_lblkno);
339#endif
340 }
341 }
342 if (nbusy) {
343 /*
344 * Failed to sync all blocks. Indicate this and don't
345 * unmount filesystems (thus forcing an fsck on reboot).
346 */
347 printf("giving up on %d buffers\n", nbusy);
348 DELAY(5000000); /* 5 seconds */
349 } else {
350 printf("done\n");
351 /*
352 * Unmount filesystems
353 */
354 if (panicstr == 0)
355 vfs_unmountall();
356 }
357 DELAY(100000); /* wait for console output to finish */
358 }
359
360 print_uptime();
361
362 /*
363 * Ok, now do things that assume all filesystem activity has
364 * been completed.
365 */
366 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
367 splhigh();
368 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP &&
369 !cold && dumper.dumper != NULL && !dumping)
370 doadump();
371
372 /* Now that we're going to really halt the system... */
373 EVENTHANDLER_INVOKE(shutdown_final, howto);
374
375 for(;;) ; /* safety against shutdown_reset not working */
376 /* NOTREACHED */
377}
378
379/*
380 * If the shutdown was a clean halt, behave accordingly.
381 */
382static void
383shutdown_halt(void *junk, int howto)
384{
385
386 if (howto & RB_HALT) {
387 printf("\n");
388 printf("The operating system has halted.\n");
389 printf("Please press any key to reboot.\n\n");
390 switch (cngetc()) {
391 case -1: /* No console, just die */
392 cpu_halt();
393 /* NOTREACHED */
394 default:
395 howto &= ~RB_HALT;
396 break;
397 }
398 }
399}
400
401/*
402 * Check to see if the system paniced, pause and then reboot
403 * according to the specified delay.
404 */
405static void
406shutdown_panic(void *junk, int howto)
407{
408 int loop;
409
410 if (howto & RB_DUMP) {
411 if (PANIC_REBOOT_WAIT_TIME != 0) {
412 if (PANIC_REBOOT_WAIT_TIME != -1) {
413 printf("Automatic reboot in %d seconds - "
414 "press a key on the console to abort\n",
415 PANIC_REBOOT_WAIT_TIME);
416 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
417 loop > 0; --loop) {
418 DELAY(1000 * 100); /* 1/10th second */
419 /* Did user type a key? */
420 if (cncheckc() != -1)
421 break;
422 }
423 if (!loop)
424 return;
425 }
426 } else { /* zero time specified - reboot NOW */
427 return;
428 }
429 printf("--> Press a key on the console to reboot,\n");
430 printf("--> or switch off the system now.\n");
431 cngetc();
432 }
433}
434
435/*
436 * Everything done, now reset
437 */
438static void
439shutdown_reset(void *junk, int howto)
440{
441
442 printf("Rebooting...\n");
443 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
444 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
445 cpu_reset();
446 /* NOTREACHED */ /* assuming reset worked */
447}
448
449/*
450 * Print a backtrace if we can.
451 */
452
453void
454backtrace(void)
455{
456
457#ifdef DDB
458 printf("Stack backtrace:\n");
459 db_print_backtrace();
460#else
461 printf("Sorry, need DDB option to print backtrace");
462#endif
463}
464
465#ifdef SMP
466static u_int panic_cpu = NOCPU;
467#endif
468
469/*
470 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
471 * and then reboots. If we are called twice, then we avoid trying to sync
472 * the disks as this often leads to recursive panics.
473 *
474 * MPSAFE
475 */
476void
477panic(const char *fmt, ...)
478{
479 struct thread *td = curthread;
480 int bootopt, newpanic;
481 va_list ap;
482 static char buf[256];
483
484#ifdef SMP
485 /*
486 * We don't want multiple CPU's to panic at the same time, so we
487 * use panic_cpu as a simple spinlock. We have to keep checking
488 * panic_cpu if we are spinning in case the panic on the first
489 * CPU is canceled.
490 */
491 if (panic_cpu != PCPU_GET(cpuid))
492 while (atomic_cmpset_int(&panic_cpu, NOCPU,
493 PCPU_GET(cpuid)) == 0)
494 while (panic_cpu != NOCPU)
495 ; /* nothing */
496#endif
497
498 bootopt = RB_AUTOBOOT | RB_DUMP;
499 newpanic = 0;
500 if (panicstr)
501 bootopt |= RB_NOSYNC;
502 else {
503 panicstr = fmt;
504 newpanic = 1;
505 }
506
507 va_start(ap, fmt);
508 if (newpanic) {
509 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
510 panicstr = buf;
511 printf("panic: %s\n", buf);
512 } else {
513 printf("panic: ");
514 vprintf(fmt, ap);
515 printf("\n");
516 }
517 va_end(ap);
518#ifdef SMP
519 /* two separate prints in case of an unmapped page and trap */
520 printf("cpuid = %d; ", PCPU_GET(cpuid));
521#ifdef APIC_IO
522 printf("lapic.id = %08x\n", lapic.id);
523#else
524 printf("\n");
525#endif
526#endif
527
528#if defined(DDB)
529 if (newpanic && trace_on_panic)
530 backtrace();
531 if (debugger_on_panic)
532 Debugger ("panic");
533#ifdef RESTARTABLE_PANICS
534 /* See if the user aborted the panic, in which case we continue. */
535 if (panicstr == NULL) {
536#ifdef SMP
537 atomic_store_rel_int(&panic_cpu, NOCPU);
538#endif
539 return;
540 }
541#endif
542#endif
543 mtx_lock_spin(&sched_lock);
544 td->td_flags |= TDF_INPANIC;
545 mtx_unlock_spin(&sched_lock);
546 if (!sync_on_panic)
547 bootopt |= RB_NOSYNC;
548 boot(bootopt);
549}
550
551/*
552 * Support for poweroff delay.
553 */
554#ifndef POWEROFF_DELAY
555# define POWEROFF_DELAY 5000
556#endif
557static int poweroff_delay = POWEROFF_DELAY;
558
559SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
560 &poweroff_delay, 0, "");
561
562static void
563poweroff_wait(void *junk, int howto)
564{
565
566 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
567 return;
568 DELAY(poweroff_delay * 1000);
569}
570
571/*
572 * Some system processes (e.g. syncer) need to be stopped at appropriate
573 * points in their main loops prior to a system shutdown, so that they
574 * won't interfere with the shutdown process (e.g. by holding a disk buf
575 * to cause sync to fail). For each of these system processes, register
576 * shutdown_kproc() as a handler for one of shutdown events.
577 */
578static int kproc_shutdown_wait = 60;
579SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
580 &kproc_shutdown_wait, 0, "");
581
582void
583kproc_shutdown(void *arg, int howto)
584{
585 struct proc *p;
586 int error;
587
588 if (panicstr)
589 return;
590
591 p = (struct proc *)arg;
592 printf("Waiting (max %d seconds) for system process `%s' to stop...",
593 kproc_shutdown_wait, p->p_comm);
594 error = kthread_suspend(p, kproc_shutdown_wait * hz);
595
596 if (error == EWOULDBLOCK)
597 printf("timed out\n");
598 else
599 printf("stopped\n");
600}
601
602/* Registration of dumpers */
603int
604set_dumper(struct dumperinfo *di)
605{
606
607 if (di == NULL) {
608 bzero(&dumper, sizeof dumper);
609 return (0);
610 }
611 if (dumper.dumper != NULL)
612 return (EBUSY);
613 dumper = *di;
614 return (0);
615}
616
617#if defined(__powerpc__)
618void
619dumpsys(struct dumperinfo *di __unused)
620{
621
622 printf("Kernel dumps not implemented on this architecture\n");
623}
624#endif
|