Add common orderly_poweroff()
Various pieces of code around the kernel want to be able to trigger an orderly poweroff. This pulls them together into a single implementation. By default the poweroff command is /sbin/poweroff, but it can be set via sysctl: kernel/poweroff_cmd. This is split at whitespace, so it can include command-line arguments. This patch replaces four other instances of invoking either "poweroff" or "shutdown -h now": two sbus drivers, and acpi thermal management. sparc64 has its own "powerd"; still need to determine whether it should be replaced by orderly_poweroff(). Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Acked-by: Len Brown <lenb@kernel.org> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Andi Kleen <ak@suse.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David S. Miller <davem@davemloft.net>
This commit is contained in:
committed by
Jeremy Fitzhardinge
parent
0ab4dc9227
commit
10a0a8d4e3
58
kernel/sys.c
58
kernel/sys.c
@ -2286,3 +2286,61 @@ asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep,
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}
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return err ? -EFAULT : 0;
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}
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char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
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static void argv_cleanup(char **argv, char **envp)
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{
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argv_free(argv);
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}
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/**
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* orderly_poweroff - Trigger an orderly system poweroff
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* @force: force poweroff if command execution fails
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*
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* This may be called from any context to trigger a system shutdown.
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* If the orderly shutdown fails, it will force an immediate shutdown.
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*/
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int orderly_poweroff(bool force)
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{
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int argc;
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char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc);
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static char *envp[] = {
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"HOME=/",
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"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
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NULL
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};
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int ret = -ENOMEM;
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struct subprocess_info *info;
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if (argv == NULL) {
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printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n",
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__func__, poweroff_cmd);
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goto out;
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}
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info = call_usermodehelper_setup(argv[0], argv, envp);
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if (info == NULL) {
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argv_free(argv);
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goto out;
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}
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call_usermodehelper_setcleanup(info, argv_cleanup);
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ret = call_usermodehelper_exec(info, -1);
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out:
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if (ret && force) {
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printk(KERN_WARNING "Failed to start orderly shutdown: "
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"forcing the issue\n");
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/* I guess this should try to kick off some daemon to
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sync and poweroff asap. Or not even bother syncing
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if we're doing an emergency shutdown? */
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emergency_sync();
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kernel_power_off();
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(orderly_poweroff);
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@ -46,6 +46,7 @@
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#include <linux/syscalls.h>
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#include <linux/nfs_fs.h>
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#include <linux/acpi.h>
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#include <linux/reboot.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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@ -705,6 +706,15 @@ static ctl_table kern_table[] = {
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.proc_handler = &proc_dointvec,
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},
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#endif
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "poweroff_cmd",
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.data = &poweroff_cmd,
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.maxlen = POWEROFF_CMD_PATH_LEN,
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.mode = 0644,
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.proc_handler = &proc_dostring,
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.strategy = &sysctl_string,
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},
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{ .ctl_name = 0 }
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};
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