reboot: move shutdown/reboot related functions to kernel/reboot.c
This patch is preparatory. It moves reboot related syscall, etc functions from kernel/sys.c to kernel/reboot.c. Signed-off-by: Robin Holt <holt@sgi.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Russ Anderson <rja@sgi.com> Cc: Robin Holt <holt@sgi.com> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Robin Holt
Linus Torvalds
Родитель
0efbee7089
Коммит
15d94b8256
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@ -9,7 +9,7 @@ obj-y = fork.o exec_domain.o panic.o printk.o \
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rcupdate.o extable.o params.o posix-timers.o \
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kthread.o wait.o sys_ni.o posix-cpu-timers.o mutex.o \
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hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
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notifier.o ksysfs.o cred.o \
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notifier.o ksysfs.o cred.o reboot.o \
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async.o range.o groups.o lglock.o smpboot.o
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ifdef CONFIG_FUNCTION_TRACER
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@ -0,0 +1,346 @@
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/*
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* linux/kernel/reboot.c
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*
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* Copyright (C) 2013 Linus Torvalds
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*/
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#include <linux/export.h>
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#include <linux/kexec.h>
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#include <linux/kmod.h>
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#include <linux/kmsg_dump.h>
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#include <linux/reboot.h>
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#include <linux/suspend.h>
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#include <linux/syscalls.h>
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#include <linux/syscore_ops.h>
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#include <linux/uaccess.h>
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/*
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* this indicates whether you can reboot with ctrl-alt-del: the default is yes
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*/
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int C_A_D = 1;
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struct pid *cad_pid;
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EXPORT_SYMBOL(cad_pid);
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/*
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* If set, this is used for preparing the system to power off.
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*/
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void (*pm_power_off_prepare)(void);
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/**
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* emergency_restart - reboot the system
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*
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* Without shutting down any hardware or taking any locks
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* reboot the system. This is called when we know we are in
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* trouble so this is our best effort to reboot. This is
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* safe to call in interrupt context.
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*/
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void emergency_restart(void)
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{
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kmsg_dump(KMSG_DUMP_EMERG);
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machine_emergency_restart();
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}
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EXPORT_SYMBOL_GPL(emergency_restart);
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void kernel_restart_prepare(char *cmd)
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{
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blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
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system_state = SYSTEM_RESTART;
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usermodehelper_disable();
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device_shutdown();
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}
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/**
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* register_reboot_notifier - Register function to be called at reboot time
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* @nb: Info about notifier function to be called
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*
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* Registers a function with the list of functions
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* to be called at reboot time.
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*
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* Currently always returns zero, as blocking_notifier_chain_register()
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* always returns zero.
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*/
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int register_reboot_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&reboot_notifier_list, nb);
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}
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EXPORT_SYMBOL(register_reboot_notifier);
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/**
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* unregister_reboot_notifier - Unregister previously registered reboot notifier
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* @nb: Hook to be unregistered
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*
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* Unregisters a previously registered reboot
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* notifier function.
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*
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* Returns zero on success, or %-ENOENT on failure.
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*/
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int unregister_reboot_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
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}
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EXPORT_SYMBOL(unregister_reboot_notifier);
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static void migrate_to_reboot_cpu(void)
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{
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/* The boot cpu is always logical cpu 0 */
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int cpu = 0;
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cpu_hotplug_disable();
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/* Make certain the cpu I'm about to reboot on is online */
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if (!cpu_online(cpu))
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cpu = cpumask_first(cpu_online_mask);
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/* Prevent races with other tasks migrating this task */
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current->flags |= PF_NO_SETAFFINITY;
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/* Make certain I only run on the appropriate processor */
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set_cpus_allowed_ptr(current, cpumask_of(cpu));
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}
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/**
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* kernel_restart - reboot the system
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* @cmd: pointer to buffer containing command to execute for restart
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* or %NULL
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*
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* Shutdown everything and perform a clean reboot.
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* This is not safe to call in interrupt context.
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*/
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void kernel_restart(char *cmd)
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{
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kernel_restart_prepare(cmd);
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migrate_to_reboot_cpu();
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syscore_shutdown();
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if (!cmd)
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printk(KERN_EMERG "Restarting system.\n");
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else
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printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
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kmsg_dump(KMSG_DUMP_RESTART);
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machine_restart(cmd);
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}
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EXPORT_SYMBOL_GPL(kernel_restart);
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static void kernel_shutdown_prepare(enum system_states state)
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{
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blocking_notifier_call_chain(&reboot_notifier_list,
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(state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
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system_state = state;
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usermodehelper_disable();
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device_shutdown();
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}
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/**
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* kernel_halt - halt the system
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*
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* Shutdown everything and perform a clean system halt.
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*/
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void kernel_halt(void)
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{
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kernel_shutdown_prepare(SYSTEM_HALT);
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migrate_to_reboot_cpu();
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syscore_shutdown();
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printk(KERN_EMERG "System halted.\n");
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kmsg_dump(KMSG_DUMP_HALT);
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machine_halt();
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}
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EXPORT_SYMBOL_GPL(kernel_halt);
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/**
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* kernel_power_off - power_off the system
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*
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* Shutdown everything and perform a clean system power_off.
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*/
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void kernel_power_off(void)
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{
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kernel_shutdown_prepare(SYSTEM_POWER_OFF);
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if (pm_power_off_prepare)
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pm_power_off_prepare();
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migrate_to_reboot_cpu();
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syscore_shutdown();
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printk(KERN_EMERG "Power down.\n");
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kmsg_dump(KMSG_DUMP_POWEROFF);
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machine_power_off();
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}
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EXPORT_SYMBOL_GPL(kernel_power_off);
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static DEFINE_MUTEX(reboot_mutex);
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/*
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* Reboot system call: for obvious reasons only root may call it,
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* and even root needs to set up some magic numbers in the registers
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* so that some mistake won't make this reboot the whole machine.
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* You can also set the meaning of the ctrl-alt-del-key here.
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*
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* reboot doesn't sync: do that yourself before calling this.
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*/
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SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
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void __user *, arg)
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{
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struct pid_namespace *pid_ns = task_active_pid_ns(current);
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char buffer[256];
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int ret = 0;
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/* We only trust the superuser with rebooting the system. */
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if (!ns_capable(pid_ns->user_ns, CAP_SYS_BOOT))
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return -EPERM;
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/* For safety, we require "magic" arguments. */
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if (magic1 != LINUX_REBOOT_MAGIC1 ||
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(magic2 != LINUX_REBOOT_MAGIC2 &&
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magic2 != LINUX_REBOOT_MAGIC2A &&
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magic2 != LINUX_REBOOT_MAGIC2B &&
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magic2 != LINUX_REBOOT_MAGIC2C))
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return -EINVAL;
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/*
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* If pid namespaces are enabled and the current task is in a child
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* pid_namespace, the command is handled by reboot_pid_ns() which will
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* call do_exit().
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*/
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ret = reboot_pid_ns(pid_ns, cmd);
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if (ret)
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return ret;
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/* Instead of trying to make the power_off code look like
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* halt when pm_power_off is not set do it the easy way.
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*/
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if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
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cmd = LINUX_REBOOT_CMD_HALT;
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mutex_lock(&reboot_mutex);
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switch (cmd) {
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case LINUX_REBOOT_CMD_RESTART:
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kernel_restart(NULL);
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break;
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case LINUX_REBOOT_CMD_CAD_ON:
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C_A_D = 1;
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break;
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case LINUX_REBOOT_CMD_CAD_OFF:
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C_A_D = 0;
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break;
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case LINUX_REBOOT_CMD_HALT:
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kernel_halt();
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do_exit(0);
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panic("cannot halt");
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case LINUX_REBOOT_CMD_POWER_OFF:
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kernel_power_off();
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do_exit(0);
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break;
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case LINUX_REBOOT_CMD_RESTART2:
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if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) {
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ret = -EFAULT;
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break;
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}
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buffer[sizeof(buffer) - 1] = '\0';
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kernel_restart(buffer);
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break;
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#ifdef CONFIG_KEXEC
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case LINUX_REBOOT_CMD_KEXEC:
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ret = kernel_kexec();
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break;
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#endif
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#ifdef CONFIG_HIBERNATION
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case LINUX_REBOOT_CMD_SW_SUSPEND:
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ret = hibernate();
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break;
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#endif
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default:
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ret = -EINVAL;
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break;
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}
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mutex_unlock(&reboot_mutex);
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return ret;
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}
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static void deferred_cad(struct work_struct *dummy)
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{
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kernel_restart(NULL);
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}
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/*
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* This function gets called by ctrl-alt-del - ie the keyboard interrupt.
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* As it's called within an interrupt, it may NOT sync: the only choice
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* is whether to reboot at once, or just ignore the ctrl-alt-del.
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*/
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void ctrl_alt_del(void)
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{
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static DECLARE_WORK(cad_work, deferred_cad);
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if (C_A_D)
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schedule_work(&cad_work);
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else
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kill_cad_pid(SIGINT, 1);
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}
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char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
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static int __orderly_poweroff(bool force)
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{
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char **argv;
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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;
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argv = argv_split(GFP_KERNEL, poweroff_cmd, NULL);
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if (argv) {
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ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
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argv_free(argv);
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} else {
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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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ret = -ENOMEM;
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}
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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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/*
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* I guess this should try to kick off some daemon to sync and
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* poweroff asap. Or not even bother syncing if we're doing an
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* emergency shutdown?
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*/
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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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static bool poweroff_force;
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static void poweroff_work_func(struct work_struct *work)
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{
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__orderly_poweroff(poweroff_force);
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}
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static DECLARE_WORK(poweroff_work, poweroff_work_func);
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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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if (force) /* do not override the pending "true" */
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poweroff_force = true;
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schedule_work(&poweroff_work);
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return 0;
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}
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EXPORT_SYMBOL_GPL(orderly_poweroff);
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331
kernel/sys.c
331
kernel/sys.c
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@ -115,20 +115,6 @@ int fs_overflowgid = DEFAULT_FS_OVERFLOWUID;
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EXPORT_SYMBOL(fs_overflowuid);
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EXPORT_SYMBOL(fs_overflowgid);
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/*
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* this indicates whether you can reboot with ctrl-alt-del: the default is yes
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*/
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int C_A_D = 1;
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struct pid *cad_pid;
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EXPORT_SYMBOL(cad_pid);
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/*
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* If set, this is used for preparing the system to power off.
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*/
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void (*pm_power_off_prepare)(void);
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/*
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* Returns true if current's euid is same as p's uid or euid,
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* or has CAP_SYS_NICE to p's user_ns.
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@ -308,261 +294,6 @@ out_unlock:
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return retval;
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}
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/**
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* emergency_restart - reboot the system
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*
|
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* Without shutting down any hardware or taking any locks
|
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* reboot the system. This is called when we know we are in
|
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* trouble so this is our best effort to reboot. This is
|
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* safe to call in interrupt context.
|
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*/
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void emergency_restart(void)
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{
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kmsg_dump(KMSG_DUMP_EMERG);
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machine_emergency_restart();
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}
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EXPORT_SYMBOL_GPL(emergency_restart);
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void kernel_restart_prepare(char *cmd)
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{
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blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
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system_state = SYSTEM_RESTART;
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usermodehelper_disable();
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device_shutdown();
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}
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/**
|
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* register_reboot_notifier - Register function to be called at reboot time
|
||||
* @nb: Info about notifier function to be called
|
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*
|
||||
* Registers a function with the list of functions
|
||||
* to be called at reboot time.
|
||||
*
|
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* Currently always returns zero, as blocking_notifier_chain_register()
|
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* always returns zero.
|
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*/
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int register_reboot_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&reboot_notifier_list, nb);
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}
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EXPORT_SYMBOL(register_reboot_notifier);
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/**
|
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* unregister_reboot_notifier - Unregister previously registered reboot notifier
|
||||
* @nb: Hook to be unregistered
|
||||
*
|
||||
* Unregisters a previously registered reboot
|
||||
* notifier function.
|
||||
*
|
||||
* Returns zero on success, or %-ENOENT on failure.
|
||||
*/
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int unregister_reboot_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
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}
|
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EXPORT_SYMBOL(unregister_reboot_notifier);
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|
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static void migrate_to_reboot_cpu(void)
|
||||
{
|
||||
/* The boot cpu is always logical cpu 0 */
|
||||
int cpu = 0;
|
||||
|
||||
cpu_hotplug_disable();
|
||||
|
||||
/* Make certain the cpu I'm about to reboot on is online */
|
||||
if (!cpu_online(cpu))
|
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cpu = cpumask_first(cpu_online_mask);
|
||||
|
||||
/* Prevent races with other tasks migrating this task */
|
||||
current->flags |= PF_NO_SETAFFINITY;
|
||||
|
||||
/* Make certain I only run on the appropriate processor */
|
||||
set_cpus_allowed_ptr(current, cpumask_of(cpu));
|
||||
}
|
||||
|
||||
/**
|
||||
* kernel_restart - reboot the system
|
||||
* @cmd: pointer to buffer containing command to execute for restart
|
||||
* or %NULL
|
||||
*
|
||||
* Shutdown everything and perform a clean reboot.
|
||||
* This is not safe to call in interrupt context.
|
||||
*/
|
||||
void kernel_restart(char *cmd)
|
||||
{
|
||||
kernel_restart_prepare(cmd);
|
||||
migrate_to_reboot_cpu();
|
||||
syscore_shutdown();
|
||||
if (!cmd)
|
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printk(KERN_EMERG "Restarting system.\n");
|
||||
else
|
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printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
|
||||
kmsg_dump(KMSG_DUMP_RESTART);
|
||||
machine_restart(cmd);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kernel_restart);
|
||||
|
||||
static void kernel_shutdown_prepare(enum system_states state)
|
||||
{
|
||||
blocking_notifier_call_chain(&reboot_notifier_list,
|
||||
(state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
|
||||
system_state = state;
|
||||
usermodehelper_disable();
|
||||
device_shutdown();
|
||||
}
|
||||
/**
|
||||
* kernel_halt - halt the system
|
||||
*
|
||||
* Shutdown everything and perform a clean system halt.
|
||||
*/
|
||||
void kernel_halt(void)
|
||||
{
|
||||
kernel_shutdown_prepare(SYSTEM_HALT);
|
||||
migrate_to_reboot_cpu();
|
||||
syscore_shutdown();
|
||||
printk(KERN_EMERG "System halted.\n");
|
||||
kmsg_dump(KMSG_DUMP_HALT);
|
||||
machine_halt();
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(kernel_halt);
|
||||
|
||||
/**
|
||||
* kernel_power_off - power_off the system
|
||||
*
|
||||
* Shutdown everything and perform a clean system power_off.
|
||||
*/
|
||||
void kernel_power_off(void)
|
||||
{
|
||||
kernel_shutdown_prepare(SYSTEM_POWER_OFF);
|
||||
if (pm_power_off_prepare)
|
||||
pm_power_off_prepare();
|
||||
migrate_to_reboot_cpu();
|
||||
syscore_shutdown();
|
||||
printk(KERN_EMERG "Power down.\n");
|
||||
kmsg_dump(KMSG_DUMP_POWEROFF);
|
||||
machine_power_off();
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kernel_power_off);
|
||||
|
||||
static DEFINE_MUTEX(reboot_mutex);
|
||||
|
||||
/*
|
||||
* Reboot system call: for obvious reasons only root may call it,
|
||||
* and even root needs to set up some magic numbers in the registers
|
||||
* so that some mistake won't make this reboot the whole machine.
|
||||
* You can also set the meaning of the ctrl-alt-del-key here.
|
||||
*
|
||||
* reboot doesn't sync: do that yourself before calling this.
|
||||
*/
|
||||
SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
|
||||
void __user *, arg)
|
||||
{
|
||||
struct pid_namespace *pid_ns = task_active_pid_ns(current);
|
||||
char buffer[256];
|
||||
int ret = 0;
|
||||
|
||||
/* We only trust the superuser with rebooting the system. */
|
||||
if (!ns_capable(pid_ns->user_ns, CAP_SYS_BOOT))
|
||||
return -EPERM;
|
||||
|
||||
/* For safety, we require "magic" arguments. */
|
||||
if (magic1 != LINUX_REBOOT_MAGIC1 ||
|
||||
(magic2 != LINUX_REBOOT_MAGIC2 &&
|
||||
magic2 != LINUX_REBOOT_MAGIC2A &&
|
||||
magic2 != LINUX_REBOOT_MAGIC2B &&
|
||||
magic2 != LINUX_REBOOT_MAGIC2C))
|
||||
return -EINVAL;
|
||||
|
||||
/*
|
||||
* If pid namespaces are enabled and the current task is in a child
|
||||
* pid_namespace, the command is handled by reboot_pid_ns() which will
|
||||
* call do_exit().
|
||||
*/
|
||||
ret = reboot_pid_ns(pid_ns, cmd);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Instead of trying to make the power_off code look like
|
||||
* halt when pm_power_off is not set do it the easy way.
|
||||
*/
|
||||
if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
|
||||
cmd = LINUX_REBOOT_CMD_HALT;
|
||||
|
||||
mutex_lock(&reboot_mutex);
|
||||
switch (cmd) {
|
||||
case LINUX_REBOOT_CMD_RESTART:
|
||||
kernel_restart(NULL);
|
||||
break;
|
||||
|
||||
case LINUX_REBOOT_CMD_CAD_ON:
|
||||
C_A_D = 1;
|
||||
break;
|
||||
|
||||
case LINUX_REBOOT_CMD_CAD_OFF:
|
||||
C_A_D = 0;
|
||||
break;
|
||||
|
||||
case LINUX_REBOOT_CMD_HALT:
|
||||
kernel_halt();
|
||||
do_exit(0);
|
||||
panic("cannot halt.\n");
|
||||
|
||||
case LINUX_REBOOT_CMD_POWER_OFF:
|
||||
kernel_power_off();
|
||||
do_exit(0);
|
||||
break;
|
||||
|
||||
case LINUX_REBOOT_CMD_RESTART2:
|
||||
if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) {
|
||||
ret = -EFAULT;
|
||||
break;
|
||||
}
|
||||
buffer[sizeof(buffer) - 1] = '\0';
|
||||
|
||||
kernel_restart(buffer);
|
||||
break;
|
||||
|
||||
#ifdef CONFIG_KEXEC
|
||||
case LINUX_REBOOT_CMD_KEXEC:
|
||||
ret = kernel_kexec();
|
||||
break;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_HIBERNATION
|
||||
case LINUX_REBOOT_CMD_SW_SUSPEND:
|
||||
ret = hibernate();
|
||||
break;
|
||||
#endif
|
||||
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
mutex_unlock(&reboot_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void deferred_cad(struct work_struct *dummy)
|
||||
{
|
||||
kernel_restart(NULL);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function gets called by ctrl-alt-del - ie the keyboard interrupt.
|
||||
* As it's called within an interrupt, it may NOT sync: the only choice
|
||||
* is whether to reboot at once, or just ignore the ctrl-alt-del.
|
||||
*/
|
||||
void ctrl_alt_del(void)
|
||||
{
|
||||
static DECLARE_WORK(cad_work, deferred_cad);
|
||||
|
||||
if (C_A_D)
|
||||
schedule_work(&cad_work);
|
||||
else
|
||||
kill_cad_pid(SIGINT, 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Unprivileged users may change the real gid to the effective gid
|
||||
* or vice versa. (BSD-style)
|
||||
|
|
@ -2287,68 +2018,6 @@ SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep,
|
|||
return err ? -EFAULT : 0;
|
||||
}
|
||||
|
||||
char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
|
||||
|
||||
static int __orderly_poweroff(bool force)
|
||||
{
|
||||
char **argv;
|
||||
static char *envp[] = {
|
||||
"HOME=/",
|
||||
"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
|
||||
NULL
|
||||
};
|
||||
int ret;
|
||||
|
||||
argv = argv_split(GFP_KERNEL, poweroff_cmd, NULL);
|
||||
if (argv) {
|
||||
ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
|
||||
argv_free(argv);
|
||||
} else {
|
||||
printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n",
|
||||
__func__, poweroff_cmd);
|
||||
ret = -ENOMEM;
|
||||
}
|
||||
|
||||
if (ret && force) {
|
||||
printk(KERN_WARNING "Failed to start orderly shutdown: "
|
||||
"forcing the issue\n");
|
||||
/*
|
||||
* I guess this should try to kick off some daemon to sync and
|
||||
* poweroff asap. Or not even bother syncing if we're doing an
|
||||
* emergency shutdown?
|
||||
*/
|
||||
emergency_sync();
|
||||
kernel_power_off();
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static bool poweroff_force;
|
||||
|
||||
static void poweroff_work_func(struct work_struct *work)
|
||||
{
|
||||
__orderly_poweroff(poweroff_force);
|
||||
}
|
||||
|
||||
static DECLARE_WORK(poweroff_work, poweroff_work_func);
|
||||
|
||||
/**
|
||||
* orderly_poweroff - Trigger an orderly system poweroff
|
||||
* @force: force poweroff if command execution fails
|
||||
*
|
||||
* This may be called from any context to trigger a system shutdown.
|
||||
* If the orderly shutdown fails, it will force an immediate shutdown.
|
||||
*/
|
||||
int orderly_poweroff(bool force)
|
||||
{
|
||||
if (force) /* do not override the pending "true" */
|
||||
poweroff_force = true;
|
||||
schedule_work(&poweroff_work);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(orderly_poweroff);
|
||||
|
||||
/**
|
||||
* do_sysinfo - fill in sysinfo struct
|
||||
* @info: pointer to buffer to fill
|
||||
|
|
|
|||
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