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.
Signed-off-by: Christoph Hellwig <[email protected]>
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 ([email protected])
*/
-#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 <[email protected]>
*/
-#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;
+}
-
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