diff options
Diffstat (limited to 'sys/kern/kern_shutdown.c')
| -rw-r--r-- | sys/kern/kern_shutdown.c | 893 |
1 files changed, 893 insertions, 0 deletions
diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c new file mode 100644 index 0000000..b120263 --- /dev/null +++ b/sys/kern/kern_shutdown.c @@ -0,0 +1,893 @@ +/*- + * Copyright (c) 1986, 1988, 1991, 1993 + * The Regents of the University of California. All rights reserved. + * (c) UNIX System Laboratories, Inc. + * All or some portions of this file are derived from material licensed + * to the University of California by American Telephone and Telegraph + * Co. or Unix System Laboratories, Inc. and are reproduced herein with + * the permission of UNIX System Laboratories, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_ddb.h" +#include "opt_kdb.h" +#include "opt_panic.h" +#include "opt_sched.h" +#include "opt_watchdog.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bio.h> +#include <sys/buf.h> +#include <sys/conf.h> +#include <sys/cons.h> +#include <sys/eventhandler.h> +#include <sys/jail.h> +#include <sys/kdb.h> +#include <sys/kernel.h> +#include <sys/kerneldump.h> +#include <sys/kthread.h> +#include <sys/ktr.h> +#include <sys/malloc.h> +#include <sys/mount.h> +#include <sys/priv.h> +#include <sys/proc.h> +#include <sys/reboot.h> +#include <sys/resourcevar.h> +#include <sys/rwlock.h> +#include <sys/sched.h> +#include <sys/smp.h> +#include <sys/sysctl.h> +#include <sys/sysproto.h> +#include <sys/vnode.h> +#include <sys/watchdog.h> + +#include <ddb/ddb.h> + +#include <machine/cpu.h> +#include <machine/pcb.h> +#include <machine/smp.h> + +#include <security/mac/mac_framework.h> + +#include <vm/vm.h> +#include <vm/vm_object.h> +#include <vm/vm_page.h> +#include <vm/vm_pager.h> +#include <vm/swap_pager.h> + +#include <sys/signalvar.h> + +#ifndef PANIC_REBOOT_WAIT_TIME +#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ +#endif + +/* + * Note that stdarg.h and the ANSI style va_start macro is used for both + * ANSI and traditional C compilers. + */ +#include <machine/stdarg.h> + +#ifdef KDB +#ifdef KDB_UNATTENDED +int debugger_on_panic = 0; +#else +int debugger_on_panic = 1; +#endif +SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, + CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN, + &debugger_on_panic, 0, "Run debugger on kernel panic"); +TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic); + +#ifdef KDB_TRACE +static int trace_on_panic = 1; +#else +static int trace_on_panic = 0; +#endif +SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, + CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN, + &trace_on_panic, 0, "Print stack trace on kernel panic"); +TUNABLE_INT("debug.trace_on_panic", &trace_on_panic); +#endif /* KDB */ + +static int sync_on_panic = 0; +SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN, + &sync_on_panic, 0, "Do a sync before rebooting from a panic"); +TUNABLE_INT("kern.sync_on_panic", &sync_on_panic); + +static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, + "Shutdown environment"); + +#ifndef DIAGNOSTIC +static int show_busybufs; +#else +static int show_busybufs = 1; +#endif +SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, + &show_busybufs, 0, ""); + +/* + * Variable panicstr contains argument to first call to panic; used as flag + * to indicate that the kernel has already called panic. + */ +const char *panicstr; + +int dumping; /* system is dumping */ +int rebooting; /* system is rebooting */ +static struct dumperinfo dumper; /* our selected dumper */ + +/* Context information for dump-debuggers. */ +static struct pcb dumppcb; /* Registers. */ +lwpid_t dumptid; /* Thread ID. */ + +static void poweroff_wait(void *, int); +static void shutdown_halt(void *junk, int howto); +static void shutdown_panic(void *junk, int howto); +static void shutdown_reset(void *junk, int howto); +static void vpanic(const char *fmt, va_list ap) __dead2; + +/* register various local shutdown events */ +static void +shutdown_conf(void *unused) +{ + + EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, + SHUTDOWN_PRI_FIRST); + EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, + SHUTDOWN_PRI_LAST + 100); + EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, + SHUTDOWN_PRI_LAST + 100); + EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, + SHUTDOWN_PRI_LAST + 200); +} + +SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); + +/* + * The system call that results in a reboot. + */ +/* ARGSUSED */ +int +sys_reboot(struct thread *td, struct reboot_args *uap) +{ + int error; + + error = 0; +#ifdef MAC + error = mac_system_check_reboot(td->td_ucred, uap->opt); +#endif + if (error == 0) + error = priv_check(td, PRIV_REBOOT); + if (error == 0) { + mtx_lock(&Giant); + kern_reboot(uap->opt); + mtx_unlock(&Giant); + } + return (error); +} + +/* + * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC + */ +static int shutdown_howto = 0; + +void +shutdown_nice(int howto) +{ + + shutdown_howto = howto; + + /* Send a signal to init(8) and have it shutdown the world */ + if (initproc != NULL) { + PROC_LOCK(initproc); + kern_psignal(initproc, SIGINT); + PROC_UNLOCK(initproc); + } else { + /* No init(8) running, so simply reboot */ + kern_reboot(RB_NOSYNC); + } + return; +} +static int waittime = -1; + +static void +print_uptime(void) +{ + int f; + struct timespec ts; + + getnanouptime(&ts); + printf("Uptime: "); + f = 0; + if (ts.tv_sec >= 86400) { + printf("%ldd", (long)ts.tv_sec / 86400); + ts.tv_sec %= 86400; + f = 1; + } + if (f || ts.tv_sec >= 3600) { + printf("%ldh", (long)ts.tv_sec / 3600); + ts.tv_sec %= 3600; + f = 1; + } + if (f || ts.tv_sec >= 60) { + printf("%ldm", (long)ts.tv_sec / 60); + ts.tv_sec %= 60; + f = 1; + } + printf("%lds\n", (long)ts.tv_sec); +} + +int +doadump(boolean_t textdump) +{ + boolean_t coredump; + + if (dumping) + return (EBUSY); + if (dumper.dumper == NULL) + return (ENXIO); + + savectx(&dumppcb); + dumptid = curthread->td_tid; + dumping++; + + coredump = TRUE; +#ifdef DDB + if (textdump && textdump_pending) { + coredump = FALSE; + textdump_dumpsys(&dumper); + } +#endif + if (coredump) + dumpsys(&dumper); + + dumping--; + return (0); +} + +static int +isbufbusy(struct buf *bp) +{ + if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && + BUF_ISLOCKED(bp)) || + ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) + return (1); + return (0); +} + +/* + * Shutdown the system cleanly to prepare for reboot, halt, or power off. + */ +void +kern_reboot(int howto) +{ + static int first_buf_printf = 1; + +#if defined(SMP) + /* + * Bind us to CPU 0 so that all shutdown code runs there. Some + * systems don't shutdown properly (i.e., ACPI power off) if we + * run on another processor. + */ + if (!SCHEDULER_STOPPED()) { + thread_lock(curthread); + sched_bind(curthread, 0); + thread_unlock(curthread); + KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); + } +#endif + /* We're in the process of rebooting. */ + rebooting = 1; + + /* collect extra flags that shutdown_nice might have set */ + howto |= shutdown_howto; + + /* We are out of the debugger now. */ + kdb_active = 0; + + /* + * Do any callouts that should be done BEFORE syncing the filesystems. + */ + EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); + + /* + * Now sync filesystems + */ + if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { + register struct buf *bp; + int iter, nbusy, pbusy; +#ifndef PREEMPTION + int subiter; +#endif + + waittime = 0; + + wdog_kern_pat(WD_LASTVAL); + sys_sync(curthread, NULL); + + /* + * With soft updates, some buffers that are + * written will be remarked as dirty until other + * buffers are written. + */ + for (iter = pbusy = 0; iter < 20; iter++) { + nbusy = 0; + for (bp = &buf[nbuf]; --bp >= buf; ) + if (isbufbusy(bp)) + nbusy++; + if (nbusy == 0) { + if (first_buf_printf) + printf("All buffers synced."); + break; + } + if (first_buf_printf) { + printf("Syncing disks, buffers remaining... "); + first_buf_printf = 0; + } + printf("%d ", nbusy); + if (nbusy < pbusy) + iter = 0; + pbusy = nbusy; + + wdog_kern_pat(WD_LASTVAL); + sys_sync(curthread, NULL); + +#ifdef PREEMPTION + /* + * Drop Giant and spin for a while to allow + * interrupt threads to run. + */ + DROP_GIANT(); + DELAY(50000 * iter); + PICKUP_GIANT(); +#else + /* + * Drop Giant and context switch several times to + * allow interrupt threads to run. + */ + DROP_GIANT(); + for (subiter = 0; subiter < 50 * iter; subiter++) { + thread_lock(curthread); + mi_switch(SW_VOL, NULL); + thread_unlock(curthread); + DELAY(1000); + } + PICKUP_GIANT(); +#endif + } + printf("\n"); + /* + * Count only busy local buffers to prevent forcing + * a fsck if we're just a client of a wedged NFS server + */ + nbusy = 0; + for (bp = &buf[nbuf]; --bp >= buf; ) { + if (isbufbusy(bp)) { +#if 0 +/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ + if (bp->b_dev == NULL) { + TAILQ_REMOVE(&mountlist, + bp->b_vp->v_mount, mnt_list); + continue; + } +#endif + nbusy++; + if (show_busybufs > 0) { + printf( + "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:", + nbusy, bp, bp->b_vp, bp->b_flags, + (intmax_t)bp->b_blkno, + (intmax_t)bp->b_lblkno); + BUF_LOCKPRINTINFO(bp); + if (show_busybufs > 1) + vn_printf(bp->b_vp, + "vnode content: "); + } + } + } + if (nbusy) { + /* + * Failed to sync all blocks. Indicate this and don't + * unmount filesystems (thus forcing an fsck on reboot). + */ + printf("Giving up on %d buffers\n", nbusy); + DELAY(5000000); /* 5 seconds */ + } else { + if (!first_buf_printf) + printf("Final sync complete\n"); + /* + * Unmount filesystems + */ + if (panicstr == 0) + vfs_unmountall(); + } + swapoff_all(); + DELAY(100000); /* wait for console output to finish */ + } + + print_uptime(); + + cngrab(); + + /* + * Ok, now do things that assume all filesystem activity has + * been completed. + */ + EVENTHANDLER_INVOKE(shutdown_post_sync, howto); + + if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) + doadump(TRUE); + + /* Now that we're going to really halt the system... */ + EVENTHANDLER_INVOKE(shutdown_final, howto); + + for(;;) ; /* safety against shutdown_reset not working */ + /* NOTREACHED */ +} + +/* + * If the shutdown was a clean halt, behave accordingly. + */ +static void +shutdown_halt(void *junk, int howto) +{ + + if (howto & RB_HALT) { + printf("\n"); + printf("The operating system has halted.\n"); + printf("Please press any key to reboot.\n\n"); + switch (cngetc()) { + case -1: /* No console, just die */ + cpu_halt(); + /* NOTREACHED */ + default: + howto &= ~RB_HALT; + break; + } + } +} + +/* + * Check to see if the system paniced, pause and then reboot + * according to the specified delay. + */ +static void +shutdown_panic(void *junk, int howto) +{ + int loop; + + if (howto & RB_DUMP) { + if (PANIC_REBOOT_WAIT_TIME != 0) { + if (PANIC_REBOOT_WAIT_TIME != -1) { + printf("Automatic reboot in %d seconds - " + "press a key on the console to abort\n", + PANIC_REBOOT_WAIT_TIME); + for (loop = PANIC_REBOOT_WAIT_TIME * 10; + loop > 0; --loop) { + DELAY(1000 * 100); /* 1/10th second */ + /* Did user type a key? */ + if (cncheckc() != -1) + break; + } + if (!loop) + return; + } + } else { /* zero time specified - reboot NOW */ + return; + } + printf("--> Press a key on the console to reboot,\n"); + printf("--> or switch off the system now.\n"); + cngetc(); + } +} + +/* + * Everything done, now reset + */ +static void +shutdown_reset(void *junk, int howto) +{ + + printf("Rebooting...\n"); + DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ + + /* + * Acquiring smp_ipi_mtx here has a double effect: + * - it disables interrupts avoiding CPU0 preemption + * by fast handlers (thus deadlocking against other CPUs) + * - it avoids deadlocks against smp_rendezvous() or, more + * generally, threads busy-waiting, with this spinlock held, + * and waiting for responses by threads on other CPUs + * (ie. smp_tlb_shootdown()). + * + * For the !SMP case it just needs to handle the former problem. + */ +#ifdef SMP + mtx_lock_spin(&smp_ipi_mtx); +#else + spinlock_enter(); +#endif + + /* cpu_boot(howto); */ /* doesn't do anything at the moment */ + cpu_reset(); + /* NOTREACHED */ /* assuming reset worked */ +} + +#if defined(WITNESS) || defined(INVARIANTS) +static int kassert_warn_only = 0; +#ifdef KDB +static int kassert_do_kdb = 0; +#endif +#ifdef KTR +static int kassert_do_ktr = 0; +#endif +static int kassert_do_log = 1; +static int kassert_log_pps_limit = 4; +static int kassert_log_mute_at = 0; +static int kassert_log_panic_at = 0; +static int kassert_warnings = 0; + +SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options"); + +SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RW | CTLFLAG_TUN, + &kassert_warn_only, 0, + "KASSERT triggers a panic (1) or just a warning (0)"); +TUNABLE_INT("debug.kassert.warn_only", &kassert_warn_only); + +#ifdef KDB +SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RW | CTLFLAG_TUN, + &kassert_do_kdb, 0, "KASSERT will enter the debugger"); +TUNABLE_INT("debug.kassert.do_kdb", &kassert_do_kdb); +#endif + +#ifdef KTR +SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RW | CTLFLAG_TUN, + &kassert_do_ktr, 0, + "KASSERT does a KTR, set this to the KTRMASK you want"); +TUNABLE_INT("debug.kassert.do_ktr", &kassert_do_ktr); +#endif + +SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RW | CTLFLAG_TUN, + &kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)"); +TUNABLE_INT("debug.kassert.do_log", &kassert_do_log); + +SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RW | CTLFLAG_TUN, + &kassert_warnings, 0, "number of KASSERTs that have been triggered"); +TUNABLE_INT("debug.kassert.warnings", &kassert_warnings); + +SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RW | CTLFLAG_TUN, + &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic"); +TUNABLE_INT("debug.kassert.log_panic_at", &kassert_log_panic_at); + +SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RW | CTLFLAG_TUN, + &kassert_log_pps_limit, 0, "limit number of log messages per second"); +TUNABLE_INT("debug.kassert.log_pps_limit", &kassert_log_pps_limit); + +SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RW | CTLFLAG_TUN, + &kassert_log_mute_at, 0, "max number of KASSERTS to log"); +TUNABLE_INT("debug.kassert.log_mute_at", &kassert_log_mute_at); + +static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS); + +SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert, + CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0, + kassert_sysctl_kassert, "I", "set to trigger a test kassert"); + +static int +kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS) +{ + int error, i; + + error = sysctl_wire_old_buffer(req, sizeof(int)); + if (error == 0) { + i = 0; + error = sysctl_handle_int(oidp, &i, 0, req); + } + if (error != 0 || req->newptr == NULL) + return (error); + KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i)); + return (0); +} + +/* + * Called by KASSERT, this decides if we will panic + * or if we will log via printf and/or ktr. + */ +void +kassert_panic(const char *fmt, ...) +{ + static char buf[256]; + va_list ap; + + va_start(ap, fmt); + (void)vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + + /* + * panic if we're not just warning, or if we've exceeded + * kassert_log_panic_at warnings. + */ + if (!kassert_warn_only || + (kassert_log_panic_at > 0 && + kassert_warnings >= kassert_log_panic_at)) { + va_start(ap, fmt); + vpanic(fmt, ap); + /* NORETURN */ + } +#ifdef KTR + if (kassert_do_ktr) + CTR0(ktr_mask, buf); +#endif /* KTR */ + /* + * log if we've not yet met the mute limit. + */ + if (kassert_do_log && + (kassert_log_mute_at == 0 || + kassert_warnings < kassert_log_mute_at)) { + static struct timeval lasterr; + static int curerr; + + if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) { + printf("KASSERT failed: %s\n", buf); + kdb_backtrace(); + } + } +#ifdef KDB + if (kassert_do_kdb) { + kdb_enter(KDB_WHY_KASSERT, buf); + } +#endif + atomic_add_int(&kassert_warnings, 1); +} +#endif + +/* + * Panic is called on unresolvable fatal errors. It prints "panic: mesg", + * and then reboots. If we are called twice, then we avoid trying to sync + * the disks as this often leads to recursive panics. + */ +void +panic(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vpanic(fmt, ap); +} + +static void +vpanic(const char *fmt, va_list ap) +{ +#ifdef SMP + cpuset_t other_cpus; +#endif + struct thread *td = curthread; + int bootopt, newpanic; + static char buf[256]; + + spinlock_enter(); + +#ifdef SMP + /* + * stop_cpus_hard(other_cpus) should prevent multiple CPUs from + * concurrently entering panic. Only the winner will proceed + * further. + */ + if (panicstr == NULL && !kdb_active) { + other_cpus = all_cpus; + CPU_CLR(PCPU_GET(cpuid), &other_cpus); + stop_cpus_hard(other_cpus); + } + + /* + * We set stop_scheduler here and not in the block above, + * because we want to ensure that if panic has been called and + * stop_scheduler_on_panic is true, then stop_scheduler will + * always be set. Even if panic has been entered from kdb. + */ + td->td_stopsched = 1; +#endif + + bootopt = RB_AUTOBOOT; + newpanic = 0; + if (panicstr) + bootopt |= RB_NOSYNC; + else { + bootopt |= RB_DUMP; + panicstr = fmt; + newpanic = 1; + } + + if (newpanic) { + (void)vsnprintf(buf, sizeof(buf), fmt, ap); + panicstr = buf; + cngrab(); + printf("panic: %s\n", buf); + } else { + printf("panic: "); + vprintf(fmt, ap); + printf("\n"); + } +#ifdef SMP + printf("cpuid = %d\n", PCPU_GET(cpuid)); +#endif + +#ifdef KDB + if (newpanic && trace_on_panic) + kdb_backtrace(); + if (debugger_on_panic) + kdb_enter(KDB_WHY_PANIC, "panic"); +#endif + /*thread_lock(td); */ + td->td_flags |= TDF_INPANIC; + /* thread_unlock(td); */ + if (!sync_on_panic) + bootopt |= RB_NOSYNC; + kern_reboot(bootopt); +} + +/* + * Support for poweroff delay. + * + * Please note that setting this delay too short might power off your machine + * before the write cache on your hard disk has been flushed, leading to + * soft-updates inconsistencies. + */ +#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, "Delay before poweroff to write disk caches (msec)"); + +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, "Max wait time (sec) to stop for each process"); + +void +kproc_shutdown(void *arg, int howto) +{ + struct proc *p; + int error; + + if (panicstr) + return; + + p = (struct proc *)arg; + printf("Waiting (max %d seconds) for system process `%s' to stop...", + kproc_shutdown_wait, p->p_comm); + error = kproc_suspend(p, kproc_shutdown_wait * hz); + + if (error == EWOULDBLOCK) + printf("timed out\n"); + else + printf("done\n"); +} + +void +kthread_shutdown(void *arg, int howto) +{ + struct thread *td; + int error; + + if (panicstr) + return; + + td = (struct thread *)arg; + printf("Waiting (max %d seconds) for system thread `%s' to stop...", + kproc_shutdown_wait, td->td_name); + error = kthread_suspend(td, kproc_shutdown_wait * hz); + + if (error == EWOULDBLOCK) + printf("timed out\n"); + else + printf("done\n"); +} + +static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)]; +SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD, + dumpdevname, 0, "Device for kernel dumps"); + +/* Registration of dumpers */ +int +set_dumper(struct dumperinfo *di, const char *devname) +{ + size_t wantcopy; + + if (di == NULL) { + bzero(&dumper, sizeof dumper); + dumpdevname[0] = '\0'; + return (0); + } + if (dumper.dumper != NULL) + return (EBUSY); + dumper = *di; + wantcopy = strlcpy(dumpdevname, devname, sizeof(dumpdevname)); + if (wantcopy >= sizeof(dumpdevname)) { + printf("set_dumper: device name truncated from '%s' -> '%s'\n", + devname, dumpdevname); + } + return (0); +} + +/* Call dumper with bounds checking. */ +int +dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, + off_t offset, size_t length) +{ + + if (length != 0 && (offset < di->mediaoffset || + offset - di->mediaoffset + length > di->mediasize)) { + printf("Attempt to write outside dump device boundaries.\n" + "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", + (intmax_t)offset, (intmax_t)di->mediaoffset, + (uintmax_t)length, (intmax_t)di->mediasize); + return (ENOSPC); + } + return (di->dumper(di->priv, virtual, physical, offset, length)); +} + +void +mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, + uint64_t dumplen, uint32_t blksz) +{ + + bzero(kdh, sizeof(*kdh)); + strncpy(kdh->magic, magic, sizeof(kdh->magic)); + strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); + kdh->version = htod32(KERNELDUMPVERSION); + kdh->architectureversion = htod32(archver); + kdh->dumplength = htod64(dumplen); + kdh->dumptime = htod64(time_second); + kdh->blocksize = htod32(blksz); + strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); + strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); + if (panicstr != NULL) + strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); + kdh->parity = kerneldump_parity(kdh); +} |
