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l com"> */ #include <linux/config.h> #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/tty.h> #include <linux/mount.h> #include <linux/kdev_t.h> #include <linux/major.h> #include <linux/reboot.h> #include <linux/sysrq.h> #include <linux/kbd_kern.h> #include <linux/quotaops.h> #include <linux/smp_lock.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/suspend.h> #include <linux/writeback.h> #include <linux/buffer_head.h> /* for fsync_bdev() */ #include <linux/swap.h> #include <linux/spinlock.h> #include <linux/vt_kern.h> #include <linux/workqueue.h> #include <linux/kexec.h> #include <asm/ptrace.h> /* Whether we react on sysrq keys or just ignore them */ int sysrq_enabled = 1; static void sysrq_handle_loglevel(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { int i; i = key - '0'; console_loglevel = 7; printk("Loglevel set to %d\n", i); console_loglevel = i; } static struct sysrq_key_op sysrq_loglevel_op = { .handler = sysrq_handle_loglevel, .help_msg = "loglevel0-8", .action_msg = "Changing Loglevel", .enable_mask = SYSRQ_ENABLE_LOG, }; #ifdef CONFIG_VT static void sysrq_handle_SAK(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { if (tty) do_SAK(tty); reset_vc(vc_cons[fg_console].d); } static struct sysrq_key_op sysrq_SAK_op = { .handler = sysrq_handle_SAK, .help_msg = "saK", .action_msg = "SAK", .enable_mask = SYSRQ_ENABLE_KEYBOARD, }; #else #define sysrq_SAK_op (*(struct sysrq_key_op *)0) #endif #ifdef CONFIG_VT static void sysrq_handle_unraw(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { struct kbd_struct *kbd = &kbd_table[fg_console]; if (kbd) kbd->kbdmode = VC_XLATE; } static struct sysrq_key_op sysrq_unraw_op = { .handler = sysrq_handle_unraw, .help_msg = "unRaw", .action_msg = "Keyboard mode set to XLATE", .enable_mask = SYSRQ_ENABLE_KEYBOARD, }; #else #define sysrq_unraw_op (*(struct sysrq_key_op *)0) #endif /* CONFIG_VT */ #ifdef CONFIG_KEXEC static void sysrq_handle_crashdump(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { crash_kexec(pt_regs); } static struct sysrq_key_op sysrq_crashdump_op = { .handler = sysrq_handle_crashdump, .help_msg = "Crashdump", .action_msg = "Trigger a crashdump", .enable_mask = SYSRQ_ENABLE_DUMP, }; #else #define sysrq_crashdump_op (*(struct sysrq_key_op *)0) #endif static void sysrq_handle_reboot(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { local_irq_enable(); emergency_restart(); } static struct sysrq_key_op sysrq_reboot_op = { .handler = sysrq_handle_reboot, .help_msg = "reBoot", .action_msg = "Resetting", .enable_mask = SYSRQ_ENABLE_BOOT, }; static void sysrq_handle_sync(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { emergency_sync(); } static struct sysrq_key_op sysrq_sync_op = { .handler = sysrq_handle_sync, .help_msg = "Sync", .action_msg = "Emergency Sync", .enable_mask = SYSRQ_ENABLE_SYNC, }; static void sysrq_handle_mountro(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { emergency_remount(); } static struct sysrq_key_op sysrq_mountro_op = { .handler = sysrq_handle_mountro, .help_msg = "Unmount", .action_msg = "Emergency Remount R/O", .enable_mask = SYSRQ_ENABLE_REMOUNT, }; #ifdef CONFIG_DEBUG_MUTEXES static void sysrq_handle_showlocks(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { mutex_debug_show_all_locks(); } static struct sysrq_key_op sysrq_showlocks_op = { .handler = sysrq_handle_showlocks, .help_msg = "show-all-locks(D)", .action_msg = "Show Locks Held", }; #else #define sysrq_showlocks_op (*(struct sysrq_key_op *)0) #endif static void sysrq_handle_showregs(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { if (pt_regs) show_regs(pt_regs); } static struct sysrq_key_op sysrq_showregs_op = { .handler = sysrq_handle_showregs, .help_msg = "showPc", .action_msg = "Show Regs", .enable_mask = SYSRQ_ENABLE_DUMP, }; static void sysrq_handle_showstate(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { show_state(); } static struct sysrq_key_op sysrq_showstate_op = { .handler = sysrq_handle_showstate, .help_msg = "showTasks", .action_msg = "Show State", .enable_mask = SYSRQ_ENABLE_DUMP, }; static void sysrq_handle_showmem(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { show_mem(); } static struct sysrq_key_op sysrq_showmem_op = { .handler = sysrq_handle_showmem, .help_msg = "showMem", .action_msg = "Show Memory", .enable_mask = SYSRQ_ENABLE_DUMP, }; /* * Signal sysrq helper function. Sends a signal to all user processes. */ static void send_sig_all(int sig) { struct task_struct *p; for_each_process(p) { if (p->mm && p->pid != 1) /* Not swapper, init nor kernel thread */ force_sig(sig, p); } } static void sysrq_handle_term(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { send_sig_all(SIGTERM); console_loglevel = 8; } static struct sysrq_key_op sysrq_term_op = { .handler = sysrq_handle_term, .help_msg = "tErm", .action_msg = "Terminate All Tasks", .enable_mask = SYSRQ_ENABLE_SIGNAL, }; static void moom_callback(void *ignored) { out_of_memory(&NODE_DATA(0)->node_zonelists[ZONE_NORMAL], GFP_KERNEL, 0); } static DECLARE_WORK(moom_work, moom_callback, NULL); static void sysrq_handle_moom(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { schedule_work(&moom_work); } static struct sysrq_key_op sysrq_moom_op = { .handler = sysrq_handle_moom, .help_msg = "Full", .action_msg = "Manual OOM execution", }; static void sysrq_handle_kill(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { send_sig_all(SIGKILL); console_loglevel = 8; } static struct sysrq_key_op sysrq_kill_op = { .handler = sysrq_handle_kill, .help_msg = "kIll", .action_msg = "Kill All Tasks", .enable_mask = SYSRQ_ENABLE_SIGNAL, }; static void sysrq_handle_unrt(int key, struct pt_regs *pt_regs, struct tty_struct *tty) { normalize_rt_tasks(); } static struct sysrq_key_op sysrq_unrt_op = { .handler = sysrq_handle_unrt, .help_msg = "Nice", .action_msg = "Nice All RT Tasks", .enable_mask = SYSRQ_ENABLE_RTNICE, }; /* Key Operations table and lock */ static DEFINE_SPINLOCK(sysrq_key_table_lock); static struct sysrq_key_op *sysrq_key_table[36] = { &sysrq_loglevel_op, /* 0 */ &sysrq_loglevel_op, /* 1 */ &sysrq_loglevel_op, /* 2 */ &sysrq_loglevel_op, /* 3 */ &sysrq_loglevel_op, /* 4 */ &sysrq_loglevel_op, /* 5 */ &sysrq_loglevel_op, /* 6 */ &sysrq_loglevel_op, /* 7 */ &sysrq_loglevel_op, /* 8 */ &sysrq_loglevel_op, /* 9 */ /* * Don't use for system provided sysrqs, it is handled specially on * sparc and will never arrive */ NULL, /* a */ &sysrq_reboot_op, /* b */ &sysrq_crashdump_op, /* c */ &sysrq_showlocks_op, /* d */ &sysrq_term_op, /* e */ &sysrq_moom_op, /* f */ NULL, /* g */ NULL, /* h */ &sysrq_kill_op, /* i */ NULL, /* j */ &sysrq_SAK_op, /* k */ NULL, /* l */ &sysrq_showmem_op, /* m */ &sysrq_unrt_op, /* n */ /* This will often be registered as 'Off' at init time */ NULL, /* o */ &sysrq_showregs_op, /* p */ NULL, /* q */ &sysrq_unraw_op, /* r */ &sysrq_sync_op, /* s */ &sysrq_showstate_op, /* t */ &sysrq_mountro_op, /* u */ /* May be assigned at init time by SMP VOYAGER */ NULL, /* v */ NULL, /* w */ NULL, /* x */ NULL, /* y */ NULL /* z */ }; /* key2index calculation, -1 on invalid index */ static int sysrq_key_table_key2index(int key) { int retval; if ((key >= '0') && (key <= '9')) retval = key - '0'; else if ((key >= 'a') && (key <= 'z')) retval = key + 10 - 'a'; else retval = -1; return retval; } /* * get and put functions for the table, exposed to modules. */ struct sysrq_key_op *__sysrq_get_key_op(int key) { struct sysrq_key_op *op_p = NULL; int i; i = sysrq_key_table_key2index(key); if (i != -1) op_p = sysrq_key_table[i]; return op_p; } static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p) { int i = sysrq_key_table_key2index(key); if (i != -1) sysrq_key_table[i] = op_p; } /* * This is the non-locking version of handle_sysrq. It must/can only be called * by sysrq key handlers, as they are inside of the lock */ void __handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty, int check_mask) { struct sysrq_key_op *op_p; int orig_log_level; int i; unsigned long flags; spin_lock_irqsave(&sysrq_key_table_lock, flags); orig_log_level = console_loglevel; console_loglevel = 7; printk(KERN_INFO "SysRq : "); op_p = __sysrq_get_key_op(key); if (op_p) { /* * Should we check for enabled operations (/proc/sysrq-trigger * should not) and is the invoked operation enabled? */ if (!check_mask || sysrq_enabled == 1 || (sysrq_enabled & op_p->enable_mask)) {