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SubjectRe: [PATCH, RFC] Standardize shutdown of the system from enviroment control modules
On Thu, Aug 11, 2005 at 07:37:17PM +0200, Christoph Hellwig wrote:
> On Tue, Aug 09, 2005 at 11:10:03PM +0200, Christoph Hellwig wrote:
> > Currently snsc_event for Altix systems sends SIGPWR to init (and abuses
> > tasklist_lock..) while the sbus drivers call execve for /sbin/shutdown
> > (which is also ugly, it should at least use call_usermodehelper)
> > With normal sysvinit both will end up the same, but I suspect the
> > shutdown variant, maybe with a sysctl to chose the exact path to call
> > would be cleaner. What do you guys think about adding a common function
> > to do this. Could you test such a patch for me?
>
> Okay, here's such a patch, I've also switched the SN and the two sbus
> drivers over.

ping?

>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
>
> Index: linux-2.6/drivers/char/snsc_event.c
> ===================================================================
> --- linux-2.6.orig/drivers/char/snsc_event.c 2005-08-11 16:45:55.000000000 +0200
> +++ linux-2.6/drivers/char/snsc_event.c 2005-08-11 19:03:59.000000000 +0200
> @@ -195,24 +195,7 @@
> severity = scdrv_event_severity(code);
>
> if ((code & EV_CLASS_MASK) == EV_CLASS_PWRD_NOTIFY) {
> - struct task_struct *p;
> -
> - /* give a SIGPWR signal to init proc */
> -
> - /* first find init's task */
> - read_lock(&tasklist_lock);
> - for_each_process(p) {
> - if (p->pid == 1)
> - break;
> - }
> - if (p) { /* we found init's task */
> - printk(KERN_EMERG "Power off indication received. Initiating power fail sequence...\n");
> - force_sig(SIGPWR, p);
> - } else { /* failed to find init's task - just give message(s) */
> - printk(KERN_WARNING "Failed to find init proc to handle power off!\n");
> - printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
> - }
> - read_unlock(&tasklist_lock);
> + envctrl_do_shutdown();
> } else {
> /* print to system log */
> printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
> Index: linux-2.6/drivers/sbus/char/bbc_envctrl.c
> ===================================================================
> --- linux-2.6.orig/drivers/sbus/char/bbc_envctrl.c 2005-08-11 16:45:59.000000000 +0200
> +++ linux-2.6/drivers/sbus/char/bbc_envctrl.c 2005-08-11 19:01:44.000000000 +0200
> @@ -4,13 +4,12 @@
> * Copyright (C) 2001 David S. Miller (davem@redhat.com)
> */
>
> -#define __KERNEL_SYSCALLS__
> -
> #include <linux/kernel.h>
> #include <linux/kthread.h>
> #include <linux/sched.h>
> #include <linux/slab.h>
> #include <linux/delay.h>
> +#include <linux/envctrl.h>
> #include <asm/oplib.h>
> #include <asm/ebus.h>
> static int errno;
> @@ -176,8 +175,6 @@
> static void do_envctrl_shutdown(struct bbc_cpu_temperature *tp)
> {
> static int shutting_down = 0;
> - static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
> - char *argv[] = { "/sbin/shutdown", "-h", "now", NULL };
> char *type = "???";
> s8 val = -1;
>
> @@ -201,8 +198,8 @@
> printk(KERN_CRIT "kenvctrld: Shutting down the system now.\n");
>
> shutting_down = 1;
> - if (execve("/sbin/shutdown", argv, envp) < 0)
> - printk(KERN_CRIT "envctrl: shutdown execution failed\n");
> +
> + envctrl_do_shutdown();
> }
>
> #define WARN_INTERVAL (30 * HZ)
> Index: linux-2.6/drivers/sbus/char/envctrl.c
> ===================================================================
> --- linux-2.6.orig/drivers/sbus/char/envctrl.c 2005-08-11 16:45:59.000000000 +0200
> +++ linux-2.6/drivers/sbus/char/envctrl.c 2005-08-11 19:01:57.000000000 +0200
> @@ -19,8 +19,6 @@
> * Daniele Bellucci <bellucda@tiscali.it>
> */
>
> -#define __KERNEL_SYSCALLS__
> -
> #include <linux/config.h>
> #include <linux/module.h>
> #include <linux/sched.h>
> @@ -33,6 +31,7 @@
> #include <linux/mm.h>
> #include <linux/slab.h>
> #include <linux/kernel.h>
> +#include <linux/envctrl.h>
>
> #include <asm/ebus.h>
> #include <asm/uaccess.h>
> @@ -975,25 +974,6 @@
> return NULL;
> }
>
> -static void envctrl_do_shutdown(void)
> -{
> - static int inprog = 0;
> - static char *envp[] = {
> - "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
> - char *argv[] = {
> - "/sbin/shutdown", "-h", "now", NULL };
> -
> - if (inprog != 0)
> - return;
> -
> - inprog = 1;
> - printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n");
> - if (0 > execve("/sbin/shutdown", argv, envp)) {
> - printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n");
> - inprog = 0; /* unlikely to succeed, but we could try again */
> - }
> -}
> -
> static struct task_struct *kenvctrld_task;
>
> static int kenvctrld(void *__unused)
> Index: linux-2.6/include/linux/envctrl.h
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/include/linux/envctrl.h 2005-08-11 18:58:41.000000000 +0200
> @@ -0,0 +1,6 @@
> +#ifndef _LINUX_ENVCTRL_H
> +#define _LINUX_ENVCTRL_H
> +
> +extern int envctrl_do_shutdown(void);
> +
> +#endif /* _LINUX_ENVCTRL_H */
> Index: linux-2.6/kernel/Makefile
> ===================================================================
> --- linux-2.6.orig/kernel/Makefile 2005-08-11 16:46:07.000000000 +0200
> +++ linux-2.6/kernel/Makefile 2005-08-11 18:57:57.000000000 +0200
> @@ -7,7 +7,7 @@
> sysctl.o capability.o ptrace.o timer.o user.o \
> signal.o sys.o kmod.o workqueue.o pid.o \
> rcupdate.o intermodule.o extable.o params.o posix-timers.o \
> - kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o
> + kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o envctrl.o
>
> obj-$(CONFIG_FUTEX) += futex.o
> obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
> Index: linux-2.6/kernel/envctrl.c
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/kernel/envctrl.c 2005-08-11 19:04:19.000000000 +0200
> @@ -0,0 +1,46 @@
> +/*
> + * Copyright (C) 2001 David S. Miller.
> + * Copyright (C) 2005 Christoph Hellwig.
> + * Released under GPL v2.
> + *
> + * Common code to shutdown the system when overheating.
> + */
> +
> +#include <linux/envctrl.h>
> +#include <linux/kernel.h>
> +#include <linux/kmod.h>
> +
> +static char *envp[] = {
> + "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL
> +};
> +
> +static char *argv[] = {
> + "/sbin/shutdown", "-h", "now", NULL
> +};
> +
> +/*
> + * envctrl_do_shutdown - shut the system down when overheating
> + *
> + * Common routine to be called from all enviromental monitoring
> + * drivers when a fatal overheating is detected.
> + *
> + * Returns 0 if /sbin/shutdown has been called sucessfully, 1 if
> + * this routine has been called already but the kernel is still
> + * running or a negative error value if executing the shutdown
> + * command failed.
> + */
> +int envctrl_do_shutdown(void)
> +{
> + static int shutting_down = 0;
> + int error;
> +
> + if (shutting_down)
> + return 1;
> + shutting_down = 1;
> +
> + printk(KERN_CRIT "envctrl: WARNING: Shutting down the system now.\n");
> + error = call_usermodehelper("/sbin/shutdown", argv, envp, 0);
> + if (error)
> + printk(KERN_CRIT "envctrl: WARNING: system shutdown failed!\n");
> + return error;
> +}
---end quoted text---
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