[RFC][PATCH 2/2] PM/Hibernate: Rename disk.c to hibernate.c

["Rafael J. Wysocki" <rjw@sisk.pl>]

From: Rafael J. Wysocki <rjw@sisk.pl>

Change the name of kernel/power/disk.c to kernel/power/hibernate.c
in analogy with the file names introduced by the changes that
separated the suspend to RAM and standby funtionality from the
common PM functions.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 kernel/power/Makefile    |    2 
 kernel/power/disk.c      |  955 -----------------------------------------------
 kernel/power/hibernate.c |  955 +++++++++++++++++++++++++++++++++++++++++++++++
 kernel/power/power.h     |    4 
 4 files changed, 958 insertions(+), 958 deletions(-)

Index: linux-2.6/kernel/power/power.h
===================================================================
--- linux-2.6.orig/kernel/power/power.h
+++ linux-2.6/kernel/power/power.h
@@ -45,7 +45,7 @@ static inline char *check_image_kernel(s
  */
 #define SPARE_PAGES	((1024 * 1024) >> PAGE_SHIFT)
 
-/* kernel/power/disk.c */
+/* kernel/power/hibernate.c */
 extern int hibernation_snapshot(int platform_mode);
 extern int hibernation_restore(int platform_mode);
 extern int hibernation_platform_enter(void);
@@ -147,7 +147,7 @@ extern int swsusp_swap_in_use(void);
  */
 #define SF_PLATFORM_MODE	1
 
-/* kernel/power/disk.c */
+/* kernel/power/hibernate.c */
 extern int swsusp_check(void);
 extern void swsusp_free(void);
 extern int swsusp_read(unsigned int *flags_p);
Index: linux-2.6/kernel/power/Makefile
===================================================================
--- linux-2.6.orig/kernel/power/Makefile
+++ linux-2.6/kernel/power/Makefile
@@ -8,6 +8,6 @@ obj-$(CONFIG_PM_SLEEP)		+= console.o
 obj-$(CONFIG_FREEZER)		+= process.o
 obj-$(CONFIG_SUSPEND)		+= suspend.o
 obj-$(CONFIG_PM_TEST_SUSPEND)	+= suspend-test.o
-obj-$(CONFIG_HIBERNATION)	+= swsusp.o disk.o snapshot.o swap.o user.o
+obj-$(CONFIG_HIBERNATION)	+= swsusp.o hibernate.o snapshot.o swap.o user.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)	+= poweroff.o
Index: linux-2.6/kernel/power/disk.c
===================================================================
--- linux-2.6.orig/kernel/power/disk.c
+++ /dev/null
@@ -1,955 +0,0 @@
-/*
- * kernel/power/disk.c - Suspend-to-disk support.
- *
- * Copyright (c) 2003 Patrick Mochel
- * Copyright (c) 2003 Open Source Development Lab
- * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
- *
- * This file is released under the GPLv2.
- *
- */
-
-#include <linux/suspend.h>
-#include <linux/syscalls.h>
-#include <linux/reboot.h>
-#include <linux/string.h>
-#include <linux/device.h>
-#include <linux/kmod.h>
-#include <linux/delay.h>
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/pm.h>
-#include <linux/console.h>
-#include <linux/cpu.h>
-#include <linux/freezer.h>
-#include <scsi/scsi_scan.h>
-#include <asm/suspend.h>
-
-#include "power.h"
-
-
-static int noresume = 0;
-static char resume_file[256] = CONFIG_PM_STD_PARTITION;
-dev_t swsusp_resume_device;
-sector_t swsusp_resume_block;
-
-enum {
-	HIBERNATION_INVALID,
-	HIBERNATION_PLATFORM,
-	HIBERNATION_TEST,
-	HIBERNATION_TESTPROC,
-	HIBERNATION_SHUTDOWN,
-	HIBERNATION_REBOOT,
-	/* keep last */
-	__HIBERNATION_AFTER_LAST
-};
-#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
-#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
-
-static int hibernation_mode = HIBERNATION_SHUTDOWN;
-
-static struct platform_hibernation_ops *hibernation_ops;
-
-/**
- * hibernation_set_ops - set the global hibernate operations
- * @ops: the hibernation operations to use in subsequent hibernation transitions
- */
-
-void hibernation_set_ops(struct platform_hibernation_ops *ops)
-{
-	if (ops && !(ops->begin && ops->end &&  ops->pre_snapshot
-	    && ops->prepare && ops->finish && ops->enter && ops->pre_restore
-	    && ops->restore_cleanup)) {
-		WARN_ON(1);
-		return;
-	}
-	mutex_lock(&pm_mutex);
-	hibernation_ops = ops;
-	if (ops)
-		hibernation_mode = HIBERNATION_PLATFORM;
-	else if (hibernation_mode == HIBERNATION_PLATFORM)
-		hibernation_mode = HIBERNATION_SHUTDOWN;
-
-	mutex_unlock(&pm_mutex);
-}
-
-static bool entering_platform_hibernation;
-
-bool system_entering_hibernation(void)
-{
-	return entering_platform_hibernation;
-}
-EXPORT_SYMBOL(system_entering_hibernation);
-
-#ifdef CONFIG_PM_DEBUG
-static void hibernation_debug_sleep(void)
-{
-	printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
-	mdelay(5000);
-}
-
-static int hibernation_testmode(int mode)
-{
-	if (hibernation_mode == mode) {
-		hibernation_debug_sleep();
-		return 1;
-	}
-	return 0;
-}
-
-static int hibernation_test(int level)
-{
-	if (pm_test_level == level) {
-		hibernation_debug_sleep();
-		return 1;
-	}
-	return 0;
-}
-#else /* !CONFIG_PM_DEBUG */
-static int hibernation_testmode(int mode) { return 0; }
-static int hibernation_test(int level) { return 0; }
-#endif /* !CONFIG_PM_DEBUG */
-
-/**
- *	platform_begin - tell the platform driver that we're starting
- *	hibernation
- */
-
-static int platform_begin(int platform_mode)
-{
-	return (platform_mode && hibernation_ops) ?
-		hibernation_ops->begin() : 0;
-}
-
-/**
- *	platform_end - tell the platform driver that we've entered the
- *	working state
- */
-
-static void platform_end(int platform_mode)
-{
-	if (platform_mode && hibernation_ops)
-		hibernation_ops->end();
-}
-
-/**
- *	platform_pre_snapshot - prepare the machine for hibernation using the
- *	platform driver if so configured and return an error code if it fails
- */
-
-static int platform_pre_snapshot(int platform_mode)
-{
-	return (platform_mode && hibernation_ops) ?
-		hibernation_ops->pre_snapshot() : 0;
-}
-
-/**
- *	platform_leave - prepare the machine for switching to the normal mode
- *	of operation using the platform driver (called with interrupts disabled)
- */
-
-static void platform_leave(int platform_mode)
-{
-	if (platform_mode && hibernation_ops)
-		hibernation_ops->leave();
-}
-
-/**
- *	platform_finish - switch the machine to the normal mode of operation
- *	using the platform driver (must be called after platform_prepare())
- */
-
-static void platform_finish(int platform_mode)
-{
-	if (platform_mode && hibernation_ops)
-		hibernation_ops->finish();
-}
-
-/**
- *	platform_pre_restore - prepare the platform for the restoration from a
- *	hibernation image.  If the restore fails after this function has been
- *	called, platform_restore_cleanup() must be called.
- */
-
-static int platform_pre_restore(int platform_mode)
-{
-	return (platform_mode && hibernation_ops) ?
-		hibernation_ops->pre_restore() : 0;
-}
-
-/**
- *	platform_restore_cleanup - switch the platform to the normal mode of
- *	operation after a failing restore.  If platform_pre_restore() has been
- *	called before the failing restore, this function must be called too,
- *	regardless of the result of platform_pre_restore().
- */
-
-static void platform_restore_cleanup(int platform_mode)
-{
-	if (platform_mode && hibernation_ops)
-		hibernation_ops->restore_cleanup();
-}
-
-/**
- *	platform_recover - recover the platform from a failure to suspend
- *	devices.
- */
-
-static void platform_recover(int platform_mode)
-{
-	if (platform_mode && hibernation_ops && hibernation_ops->recover)
-		hibernation_ops->recover();
-}
-
-/**
- *	create_image - freeze devices that need to be frozen with interrupts
- *	off, create the hibernation image and thaw those devices.  Control
- *	reappears in this routine after a restore.
- */
-
-static int create_image(int platform_mode)
-{
-	int error;
-
-	error = arch_prepare_suspend();
-	if (error)
-		return error;
-
-	/* At this point, dpm_suspend_start() has been called, but *not*
-	 * dpm_suspend_noirq(). We *must* call dpm_suspend_noirq() now.
-	 * Otherwise, drivers for some devices (e.g. interrupt controllers)
-	 * become desynchronized with the actual state of the hardware
-	 * at resume time, and evil weirdness ensues.
-	 */
-	error = dpm_suspend_noirq(PMSG_FREEZE);
-	if (error) {
-		printk(KERN_ERR "PM: Some devices failed to power down, "
-			"aborting hibernation\n");
-		return error;
-	}
-
-	error = platform_pre_snapshot(platform_mode);
-	if (error || hibernation_test(TEST_PLATFORM))
-		goto Platform_finish;
-
-	error = disable_nonboot_cpus();
-	if (error || hibernation_test(TEST_CPUS)
-	    || hibernation_testmode(HIBERNATION_TEST))
-		goto Enable_cpus;
-
-	local_irq_disable();
-
-	error = sysdev_suspend(PMSG_FREEZE);
-	if (error) {
-		printk(KERN_ERR "PM: Some system devices failed to power down, "
-			"aborting hibernation\n");
-		goto Enable_irqs;
-	}
-
-	if (hibernation_test(TEST_CORE))
-		goto Power_up;
-
-	in_suspend = 1;
-	save_processor_state();
-	error = swsusp_arch_suspend();
-	if (error)
-		printk(KERN_ERR "PM: Error %d creating hibernation image\n",
-			error);
-	/* Restore control flow magically appears here */
-	restore_processor_state();
-	if (!in_suspend)
-		platform_leave(platform_mode);
-
- Power_up:
-	sysdev_resume();
-	/* NOTE:  dpm_resume_noirq() is just a resume() for devices
-	 * that suspended with irqs off ... no overall powerup.
-	 */
-
- Enable_irqs:
-	local_irq_enable();
-
- Enable_cpus:
-	enable_nonboot_cpus();
-
- Platform_finish:
-	platform_finish(platform_mode);
-
-	dpm_resume_noirq(in_suspend ?
-		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
-
-	return error;
-}
-
-/**
- *	hibernation_snapshot - quiesce devices and create the hibernation
- *	snapshot image.
- *	@platform_mode - if set, use the platform driver, if available, to
- *			 prepare the platform firmware for the power transition.
- *
- *	Must be called with pm_mutex held
- */
-
-int hibernation_snapshot(int platform_mode)
-{
-	int error;
-
-	error = platform_begin(platform_mode);
-	if (error)
-		return error;
-
-	/* Free memory before shutting down devices. */
-	error = swsusp_shrink_memory();
-	if (error)
-		goto Close;
-
-	suspend_console();
-	error = dpm_suspend_start(PMSG_FREEZE);
-	if (error)
-		goto Recover_platform;
-
-	if (hibernation_test(TEST_DEVICES))
-		goto Recover_platform;
-
-	error = create_image(platform_mode);
-	/* Control returns here after successful restore */
-
- Resume_devices:
-	dpm_resume_end(in_suspend ?
-		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
-	resume_console();
- Close:
-	platform_end(platform_mode);
-	return error;
-
- Recover_platform:
-	platform_recover(platform_mode);
-	goto Resume_devices;
-}
-
-/**
- *	resume_target_kernel - prepare devices that need to be suspended with
- *	interrupts off, restore the contents of highmem that have not been
- *	restored yet from the image and run the low level code that will restore
- *	the remaining contents of memory and switch to the just restored target
- *	kernel.
- */
-
-static int resume_target_kernel(bool platform_mode)
-{
-	int error;
-
-	error = dpm_suspend_noirq(PMSG_QUIESCE);
-	if (error) {
-		printk(KERN_ERR "PM: Some devices failed to power down, "
-			"aborting resume\n");
-		return error;
-	}
-
-	error = platform_pre_restore(platform_mode);
-	if (error)
-		goto Cleanup;
-
-	error = disable_nonboot_cpus();
-	if (error)
-		goto Enable_cpus;
-
-	local_irq_disable();
-
-	error = sysdev_suspend(PMSG_QUIESCE);
-	if (error)
-		goto Enable_irqs;
-
-	/* We'll ignore saved state, but this gets preempt count (etc) right */
-	save_processor_state();
-	error = restore_highmem();
-	if (!error) {
-		error = swsusp_arch_resume();
-		/*
-		 * The code below is only ever reached in case of a failure.
-		 * Otherwise execution continues at place where
-		 * swsusp_arch_suspend() was called
-		 */
-		BUG_ON(!error);
-		/* This call to restore_highmem() undos the previous one */
-		restore_highmem();
-	}
-	/*
-	 * The only reason why swsusp_arch_resume() can fail is memory being
-	 * very tight, so we have to free it as soon as we can to avoid
-	 * subsequent failures
-	 */
-	swsusp_free();
-	restore_processor_state();
-	touch_softlockup_watchdog();
-
-	sysdev_resume();
-
- Enable_irqs:
-	local_irq_enable();
-
- Enable_cpus:
-	enable_nonboot_cpus();
-
- Cleanup:
-	platform_restore_cleanup(platform_mode);
-
-	dpm_resume_noirq(PMSG_RECOVER);
-
-	return error;
-}
-
-/**
- *	hibernation_restore - quiesce devices and restore the hibernation
- *	snapshot image.  If successful, control returns in hibernation_snaphot()
- *	@platform_mode - if set, use the platform driver, if available, to
- *			 prepare the platform firmware for the transition.
- *
- *	Must be called with pm_mutex held
- */
-
-int hibernation_restore(int platform_mode)
-{
-	int error;
-
-	pm_prepare_console();
-	suspend_console();
-	error = dpm_suspend_start(PMSG_QUIESCE);
-	if (!error) {
-		error = resume_target_kernel(platform_mode);
-		dpm_resume_end(PMSG_RECOVER);
-	}
-	resume_console();
-	pm_restore_console();
-	return error;
-}
-
-/**
- *	hibernation_platform_enter - enter the hibernation state using the
- *	platform driver (if available)
- */
-
-int hibernation_platform_enter(void)
-{
-	int error;
-
-	if (!hibernation_ops)
-		return -ENOSYS;
-
-	/*
-	 * We have cancelled the power transition by running
-	 * hibernation_ops->finish() before saving the image, so we should let
-	 * the firmware know that we're going to enter the sleep state after all
-	 */
-	error = hibernation_ops->begin();
-	if (error)
-		goto Close;
-
-	entering_platform_hibernation = true;
-	suspend_console();
-	error = dpm_suspend_start(PMSG_HIBERNATE);
-	if (error) {
-		if (hibernation_ops->recover)
-			hibernation_ops->recover();
-		goto Resume_devices;
-	}
-
-	error = dpm_suspend_noirq(PMSG_HIBERNATE);
-	if (error)
-		goto Resume_devices;
-
-	error = hibernation_ops->prepare();
-	if (error)
-		goto Platofrm_finish;
-
-	error = disable_nonboot_cpus();
-	if (error)
-		goto Platofrm_finish;
-
-	local_irq_disable();
-	sysdev_suspend(PMSG_HIBERNATE);
-	hibernation_ops->enter();
-	/* We should never get here */
-	while (1);
-
-	/*
-	 * We don't need to reenable the nonboot CPUs or resume consoles, since
-	 * the system is going to be halted anyway.
-	 */
- Platofrm_finish:
-	hibernation_ops->finish();
-
-	dpm_suspend_noirq(PMSG_RESTORE);
-
- Resume_devices:
-	entering_platform_hibernation = false;
-	dpm_resume_end(PMSG_RESTORE);
-	resume_console();
-
- Close:
-	hibernation_ops->end();
-
-	return error;
-}
-
-/**
- *	power_down - Shut the machine down for hibernation.
- *
- *	Use the platform driver, if configured so; otherwise try
- *	to power off or reboot.
- */
-
-static void power_down(void)
-{
-	switch (hibernation_mode) {
-	case HIBERNATION_TEST:
-	case HIBERNATION_TESTPROC:
-		break;
-	case HIBERNATION_REBOOT:
-		kernel_restart(NULL);
-		break;
-	case HIBERNATION_PLATFORM:
-		hibernation_platform_enter();
-	case HIBERNATION_SHUTDOWN:
-		kernel_power_off();
-		break;
-	}
-	kernel_halt();
-	/*
-	 * Valid image is on the disk, if we continue we risk serious data
-	 * corruption after resume.
-	 */
-	printk(KERN_CRIT "PM: Please power down manually\n");
-	while(1);
-}
-
-static int prepare_processes(void)
-{
-	int error = 0;
-
-	if (freeze_processes()) {
-		error = -EBUSY;
-		thaw_processes();
-	}
-	return error;
-}
-
-/**
- *	hibernate - The granpappy of the built-in hibernation management
- */
-
-int hibernate(void)
-{
-	int error;
-
-	mutex_lock(&pm_mutex);
-	/* The snapshot device should not be opened while we're running */
-	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
-		error = -EBUSY;
-		goto Unlock;
-	}
-
-	pm_prepare_console();
-	error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
-	if (error)
-		goto Exit;
-
-	error = usermodehelper_disable();
-	if (error)
-		goto Exit;
-
-	/* Allocate memory management structures */
-	error = create_basic_memory_bitmaps();
-	if (error)
-		goto Exit;
-
-	printk(KERN_INFO "PM: Syncing filesystems ... ");
-	sys_sync();
-	printk("done.\n");
-
-	error = prepare_processes();
-	if (error)
-		goto Finish;
-
-	if (hibernation_test(TEST_FREEZER))
-		goto Thaw;
-
-	if (hibernation_testmode(HIBERNATION_TESTPROC))
-		goto Thaw;
-
-	error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
-	if (in_suspend && !error) {
-		unsigned int flags = 0;
-
-		if (hibernation_mode == HIBERNATION_PLATFORM)
-			flags |= SF_PLATFORM_MODE;
-		pr_debug("PM: writing image.\n");
-		error = swsusp_write(flags);
-		swsusp_free();
-		if (!error)
-			power_down();
-	} else {
-		pr_debug("PM: Image restored successfully.\n");
-		swsusp_free();
-	}
- Thaw:
-	thaw_processes();
- Finish:
-	free_basic_memory_bitmaps();
-	usermodehelper_enable();
- Exit:
-	pm_notifier_call_chain(PM_POST_HIBERNATION);
-	pm_restore_console();
-	atomic_inc(&snapshot_device_available);
- Unlock:
-	mutex_unlock(&pm_mutex);
-	return error;
-}
-
-
-/**
- *	software_resume - Resume from a saved image.
- *
- *	Called as a late_initcall (so all devices are discovered and
- *	initialized), we call swsusp to see if we have a saved image or not.
- *	If so, we quiesce devices, the restore the saved image. We will
- *	return above (in hibernate() ) if everything goes well.
- *	Otherwise, we fail gracefully and return to the normally
- *	scheduled program.
- *
- */
-
-static int software_resume(void)
-{
-	int error;
-	unsigned int flags;
-
-	/*
-	 * If the user said "noresume".. bail out early.
-	 */
-	if (noresume)
-		return 0;
-
-	/*
-	 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
-	 * is configured into the kernel. Since the regular hibernate
-	 * trigger path is via sysfs which takes a buffer mutex before
-	 * calling hibernate functions (which take pm_mutex) this can
-	 * cause lockdep to complain about a possible ABBA deadlock
-	 * which cannot happen since we're in the boot code here and
-	 * sysfs can't be invoked yet. Therefore, we use a subclass
-	 * here to avoid lockdep complaining.
-	 */
-	mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
-
-	if (swsusp_resume_device)
-		goto Check_image;
-
-	if (!strlen(resume_file)) {
-		error = -ENOENT;
-		goto Unlock;
-	}
-
-	pr_debug("PM: Checking image partition %s\n", resume_file);
-
-	/* Check if the device is there */
-	swsusp_resume_device = name_to_dev_t(resume_file);
-	if (!swsusp_resume_device) {
-		/*
-		 * Some device discovery might still be in progress; we need
-		 * to wait for this to finish.
-		 */
-		wait_for_device_probe();
-		/*
-		 * We can't depend on SCSI devices being available after loading
-		 * one of their modules until scsi_complete_async_scans() is
-		 * called and the resume device usually is a SCSI one.
-		 */
-		scsi_complete_async_scans();
-
-		swsusp_resume_device = name_to_dev_t(resume_file);
-		if (!swsusp_resume_device) {
-			error = -ENODEV;
-			goto Unlock;
-		}
-	}
-
- Check_image:
-	pr_debug("PM: Resume from partition %d:%d\n",
-		MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
-
-	pr_debug("PM: Checking hibernation image.\n");
-	error = swsusp_check();
-	if (error)
-		goto Unlock;
-
-	/* The snapshot device should not be opened while we're running */
-	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
-		error = -EBUSY;
-		goto Unlock;
-	}
-
-	pm_prepare_console();
-	error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
-	if (error)
-		goto Finish;
-
-	error = usermodehelper_disable();
-	if (error)
-		goto Finish;
-
-	error = create_basic_memory_bitmaps();
-	if (error)
-		goto Finish;
-
-	pr_debug("PM: Preparing processes for restore.\n");
-	error = prepare_processes();
-	if (error) {
-		swsusp_close(FMODE_READ);
-		goto Done;
-	}
-
-	pr_debug("PM: Reading hibernation image.\n");
-
-	error = swsusp_read(&flags);
-	if (!error)
-		hibernation_restore(flags & SF_PLATFORM_MODE);
-
-	printk(KERN_ERR "PM: Restore failed, recovering.\n");
-	swsusp_free();
-	thaw_processes();
- Done:
-	free_basic_memory_bitmaps();
-	usermodehelper_enable();
- Finish:
-	pm_notifier_call_chain(PM_POST_RESTORE);
-	pm_restore_console();
-	atomic_inc(&snapshot_device_available);
-	/* For success case, the suspend path will release the lock */
- Unlock:
-	mutex_unlock(&pm_mutex);
-	pr_debug("PM: Resume from disk failed.\n");
-	return error;
-}
-
-late_initcall(software_resume);
-
-
-static const char * const hibernation_modes[] = {
-	[HIBERNATION_PLATFORM]	= "platform",
-	[HIBERNATION_SHUTDOWN]	= "shutdown",
-	[HIBERNATION_REBOOT]	= "reboot",
-	[HIBERNATION_TEST]	= "test",
-	[HIBERNATION_TESTPROC]	= "testproc",
-};
-
-/**
- *	disk - Control hibernation mode
- *
- *	Suspend-to-disk can be handled in several ways. We have a few options
- *	for putting the system to sleep - using the platform driver (e.g. ACPI
- *	or other hibernation_ops), powering off the system or rebooting the
- *	system (for testing) as well as the two test modes.
- *
- *	The system can support 'platform', and that is known a priori (and
- *	encoded by the presence of hibernation_ops). However, the user may
- *	choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
- *	test modes, 'test' or 'testproc'.
- *
- *	show() will display what the mode is currently set to.
- *	store() will accept one of
- *
- *	'platform'
- *	'shutdown'
- *	'reboot'
- *	'test'
- *	'testproc'
- *
- *	It will only change to 'platform' if the system
- *	supports it (as determined by having hibernation_ops).
- */
-
-static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
-			 char *buf)
-{
-	int i;
-	char *start = buf;
-
-	for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
-		if (!hibernation_modes[i])
-			continue;
-		switch (i) {
-		case HIBERNATION_SHUTDOWN:
-		case HIBERNATION_REBOOT:
-		case HIBERNATION_TEST:
-		case HIBERNATION_TESTPROC:
-			break;
-		case HIBERNATION_PLATFORM:
-			if (hibernation_ops)
-				break;
-			/* not a valid mode, continue with loop */
-			continue;
-		}
-		if (i == hibernation_mode)
-			buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
-		else
-			buf += sprintf(buf, "%s ", hibernation_modes[i]);
-	}
-	buf += sprintf(buf, "\n");
-	return buf-start;
-}
-
-
-static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
-			  const char *buf, size_t n)
-{
-	int error = 0;
-	int i;
-	int len;
-	char *p;
-	int mode = HIBERNATION_INVALID;
-
-	p = memchr(buf, '\n', n);
-	len = p ? p - buf : n;
-
-	mutex_lock(&pm_mutex);
-	for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
-		if (len == strlen(hibernation_modes[i])
-		    && !strncmp(buf, hibernation_modes[i], len)) {
-			mode = i;
-			break;
-		}
-	}
-	if (mode != HIBERNATION_INVALID) {
-		switch (mode) {
-		case HIBERNATION_SHUTDOWN:
-		case HIBERNATION_REBOOT:
-		case HIBERNATION_TEST:
-		case HIBERNATION_TESTPROC:
-			hibernation_mode = mode;
-			break;
-		case HIBERNATION_PLATFORM:
-			if (hibernation_ops)
-				hibernation_mode = mode;
-			else
-				error = -EINVAL;
-		}
-	} else
-		error = -EINVAL;
-
-	if (!error)
-		pr_debug("PM: Hibernation mode set to '%s'\n",
-			 hibernation_modes[mode]);
-	mutex_unlock(&pm_mutex);
-	return error ? error : n;
-}
-
-power_attr(disk);
-
-static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
-			   char *buf)
-{
-	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
-		       MINOR(swsusp_resume_device));
-}
-
-static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
-			    const char *buf, size_t n)
-{
-	unsigned int maj, min;
-	dev_t res;
-	int ret = -EINVAL;
-
-	if (sscanf(buf, "%u:%u", &maj, &min) != 2)
-		goto out;
-
-	res = MKDEV(maj,min);
-	if (maj != MAJOR(res) || min != MINOR(res))
-		goto out;
-
-	mutex_lock(&pm_mutex);
-	swsusp_resume_device = res;
-	mutex_unlock(&pm_mutex);
-	printk(KERN_INFO "PM: Starting manual resume from disk\n");
-	noresume = 0;
-	software_resume();
-	ret = n;
- out:
-	return ret;
-}
-
-power_attr(resume);
-
-static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
-			       char *buf)
-{
-	return sprintf(buf, "%lu\n", image_size);
-}
-
-static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
-				const char *buf, size_t n)
-{
-	unsigned long size;
-
-	if (sscanf(buf, "%lu", &size) == 1) {
-		image_size = size;
-		return n;
-	}
-
-	return -EINVAL;
-}
-
-power_attr(image_size);
-
-static struct attribute * g[] = {
-	&disk_attr.attr,
-	&resume_attr.attr,
-	&image_size_attr.attr,
-	NULL,
-};
-
-
-static struct attribute_group attr_group = {
-	.attrs = g,
-};
-
-
-static int __init pm_disk_init(void)
-{
-	return sysfs_create_group(power_kobj, &attr_group);
-}
-
-core_initcall(pm_disk_init);
-
-
-static int __init resume_setup(char *str)
-{
-	if (noresume)
-		return 1;
-
-	strncpy( resume_file, str, 255 );
-	return 1;
-}
-
-static int __init resume_offset_setup(char *str)
-{
-	unsigned long long offset;
-
-	if (noresume)
-		return 1;
-
-	if (sscanf(str, "%llu", &offset) == 1)
-		swsusp_resume_block = offset;
-
-	return 1;
-}
-
-static int __init noresume_setup(char *str)
-{
-	noresume = 1;
-	return 1;
-}
-
-__setup("noresume", noresume_setup);
-__setup("resume_offset=", resume_offset_setup);
-__setup("resume=", resume_setup);
Index: linux-2.6/kernel/power/hibernate.c
===================================================================
--- /dev/null
+++ linux-2.6/kernel/power/hibernate.c
@@ -0,0 +1,955 @@
+/*
+ * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
+ *
+ * Copyright (c) 2003 Patrick Mochel
+ * Copyright (c) 2003 Open Source Development Lab
+ * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/suspend.h>
+#include <linux/syscalls.h>
+#include <linux/reboot.h>
+#include <linux/string.h>
+#include <linux/device.h>
+#include <linux/kmod.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/pm.h>
+#include <linux/console.h>
+#include <linux/cpu.h>
+#include <linux/freezer.h>
+#include <scsi/scsi_scan.h>
+#include <asm/suspend.h>
+
+#include "power.h"
+
+
+static int noresume = 0;
+static char resume_file[256] = CONFIG_PM_STD_PARTITION;
+dev_t swsusp_resume_device;
+sector_t swsusp_resume_block;
+
+enum {
+	HIBERNATION_INVALID,
+	HIBERNATION_PLATFORM,
+	HIBERNATION_TEST,
+	HIBERNATION_TESTPROC,
+	HIBERNATION_SHUTDOWN,
+	HIBERNATION_REBOOT,
+	/* keep last */
+	__HIBERNATION_AFTER_LAST
+};
+#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
+#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
+
+static int hibernation_mode = HIBERNATION_SHUTDOWN;
+
+static struct platform_hibernation_ops *hibernation_ops;
+
+/**
+ * hibernation_set_ops - set the global hibernate operations
+ * @ops: the hibernation operations to use in subsequent hibernation transitions
+ */
+
+void hibernation_set_ops(struct platform_hibernation_ops *ops)
+{
+	if (ops && !(ops->begin && ops->end &&  ops->pre_snapshot
+	    && ops->prepare && ops->finish && ops->enter && ops->pre_restore
+	    && ops->restore_cleanup)) {
+		WARN_ON(1);
+		return;
+	}
+	mutex_lock(&pm_mutex);
+	hibernation_ops = ops;
+	if (ops)
+		hibernation_mode = HIBERNATION_PLATFORM;
+	else if (hibernation_mode == HIBERNATION_PLATFORM)
+		hibernation_mode = HIBERNATION_SHUTDOWN;
+
+	mutex_unlock(&pm_mutex);
+}
+
+static bool entering_platform_hibernation;
+
+bool system_entering_hibernation(void)
+{
+	return entering_platform_hibernation;
+}
+EXPORT_SYMBOL(system_entering_hibernation);
+
+#ifdef CONFIG_PM_DEBUG
+static void hibernation_debug_sleep(void)
+{
+	printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
+	mdelay(5000);
+}
+
+static int hibernation_testmode(int mode)
+{
+	if (hibernation_mode == mode) {
+		hibernation_debug_sleep();
+		return 1;
+	}
+	return 0;
+}
+
+static int hibernation_test(int level)
+{
+	if (pm_test_level == level) {
+		hibernation_debug_sleep();
+		return 1;
+	}
+	return 0;
+}
+#else /* !CONFIG_PM_DEBUG */
+static int hibernation_testmode(int mode) { return 0; }
+static int hibernation_test(int level) { return 0; }
+#endif /* !CONFIG_PM_DEBUG */
+
+/**
+ *	platform_begin - tell the platform driver that we're starting
+ *	hibernation
+ */
+
+static int platform_begin(int platform_mode)
+{
+	return (platform_mode && hibernation_ops) ?
+		hibernation_ops->begin() : 0;
+}
+
+/**
+ *	platform_end - tell the platform driver that we've entered the
+ *	working state
+ */
+
+static void platform_end(int platform_mode)
+{
+	if (platform_mode && hibernation_ops)
+		hibernation_ops->end();
+}
+
+/**
+ *	platform_pre_snapshot - prepare the machine for hibernation using the
+ *	platform driver if so configured and return an error code if it fails
+ */
+
+static int platform_pre_snapshot(int platform_mode)
+{
+	return (platform_mode && hibernation_ops) ?
+		hibernation_ops->pre_snapshot() : 0;
+}
+
+/**
+ *	platform_leave - prepare the machine for switching to the normal mode
+ *	of operation using the platform driver (called with interrupts disabled)
+ */
+
+static void platform_leave(int platform_mode)
+{
+	if (platform_mode && hibernation_ops)
+		hibernation_ops->leave();
+}
+
+/**
+ *	platform_finish - switch the machine to the normal mode of operation
+ *	using the platform driver (must be called after platform_prepare())
+ */
+
+static void platform_finish(int platform_mode)
+{
+	if (platform_mode && hibernation_ops)
+		hibernation_ops->finish();
+}
+
+/**
+ *	platform_pre_restore - prepare the platform for the restoration from a
+ *	hibernation image.  If the restore fails after this function has been
+ *	called, platform_restore_cleanup() must be called.
+ */
+
+static int platform_pre_restore(int platform_mode)
+{
+	return (platform_mode && hibernation_ops) ?
+		hibernation_ops->pre_restore() : 0;
+}
+
+/**
+ *	platform_restore_cleanup - switch the platform to the normal mode of
+ *	operation after a failing restore.  If platform_pre_restore() has been
+ *	called before the failing restore, this function must be called too,
+ *	regardless of the result of platform_pre_restore().
+ */
+
+static void platform_restore_cleanup(int platform_mode)
+{
+	if (platform_mode && hibernation_ops)
+		hibernation_ops->restore_cleanup();
+}
+
+/**
+ *	platform_recover - recover the platform from a failure to suspend
+ *	devices.
+ */
+
+static void platform_recover(int platform_mode)
+{
+	if (platform_mode && hibernation_ops && hibernation_ops->recover)
+		hibernation_ops->recover();
+}
+
+/**
+ *	create_image - freeze devices that need to be frozen with interrupts
+ *	off, create the hibernation image and thaw those devices.  Control
+ *	reappears in this routine after a restore.
+ */
+
+static int create_image(int platform_mode)
+{
+	int error;
+
+	error = arch_prepare_suspend();
+	if (error)
+		return error;
+
+	/* At this point, dpm_suspend_start() has been called, but *not*
+	 * dpm_suspend_noirq(). We *must* call dpm_suspend_noirq() now.
+	 * Otherwise, drivers for some devices (e.g. interrupt controllers)
+	 * become desynchronized with the actual state of the hardware
+	 * at resume time, and evil weirdness ensues.
+	 */
+	error = dpm_suspend_noirq(PMSG_FREEZE);
+	if (error) {
+		printk(KERN_ERR "PM: Some devices failed to power down, "
+			"aborting hibernation\n");
+		return error;
+	}
+
+	error = platform_pre_snapshot(platform_mode);
+	if (error || hibernation_test(TEST_PLATFORM))
+		goto Platform_finish;
+
+	error = disable_nonboot_cpus();
+	if (error || hibernation_test(TEST_CPUS)
+	    || hibernation_testmode(HIBERNATION_TEST))
+		goto Enable_cpus;
+
+	local_irq_disable();
+
+	error = sysdev_suspend(PMSG_FREEZE);
+	if (error) {
+		printk(KERN_ERR "PM: Some system devices failed to power down, "
+			"aborting hibernation\n");
+		goto Enable_irqs;
+	}
+
+	if (hibernation_test(TEST_CORE))
+		goto Power_up;
+
+	in_suspend = 1;
+	save_processor_state();
+	error = swsusp_arch_suspend();
+	if (error)
+		printk(KERN_ERR "PM: Error %d creating hibernation image\n",
+			error);
+	/* Restore control flow magically appears here */
+	restore_processor_state();
+	if (!in_suspend)
+		platform_leave(platform_mode);
+
+ Power_up:
+	sysdev_resume();
+	/* NOTE:  dpm_resume_noirq() is just a resume() for devices
+	 * that suspended with irqs off ... no overall powerup.
+	 */
+
+ Enable_irqs:
+	local_irq_enable();
+
+ Enable_cpus:
+	enable_nonboot_cpus();
+
+ Platform_finish:
+	platform_finish(platform_mode);
+
+	dpm_resume_noirq(in_suspend ?
+		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+
+	return error;
+}
+
+/**
+ *	hibernation_snapshot - quiesce devices and create the hibernation
+ *	snapshot image.
+ *	@platform_mode - if set, use the platform driver, if available, to
+ *			 prepare the platform firmware for the power transition.
+ *
+ *	Must be called with pm_mutex held
+ */
+
+int hibernation_snapshot(int platform_mode)
+{
+	int error;
+
+	error = platform_begin(platform_mode);
+	if (error)
+		return error;
+
+	/* Free memory before shutting down devices. */
+	error = swsusp_shrink_memory();
+	if (error)
+		goto Close;
+
+	suspend_console();
+	error = dpm_suspend_start(PMSG_FREEZE);
+	if (error)
+		goto Recover_platform;
+
+	if (hibernation_test(TEST_DEVICES))
+		goto Recover_platform;
+
+	error = create_image(platform_mode);
+	/* Control returns here after successful restore */
+
+ Resume_devices:
+	dpm_resume_end(in_suspend ?
+		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+	resume_console();
+ Close:
+	platform_end(platform_mode);
+	return error;
+
+ Recover_platform:
+	platform_recover(platform_mode);
+	goto Resume_devices;
+}
+
+/**
+ *	resume_target_kernel - prepare devices that need to be suspended with
+ *	interrupts off, restore the contents of highmem that have not been
+ *	restored yet from the image and run the low level code that will restore
+ *	the remaining contents of memory and switch to the just restored target
+ *	kernel.
+ */
+
+static int resume_target_kernel(bool platform_mode)
+{
+	int error;
+
+	error = dpm_suspend_noirq(PMSG_QUIESCE);
+	if (error) {
+		printk(KERN_ERR "PM: Some devices failed to power down, "
+			"aborting resume\n");
+		return error;
+	}
+
+	error = platform_pre_restore(platform_mode);
+	if (error)
+		goto Cleanup;
+
+	error = disable_nonboot_cpus();
+	if (error)
+		goto Enable_cpus;
+
+	local_irq_disable();
+
+	error = sysdev_suspend(PMSG_QUIESCE);
+	if (error)
+		goto Enable_irqs;
+
+	/* We'll ignore saved state, but this gets preempt count (etc) right */
+	save_processor_state();
+	error = restore_highmem();
+	if (!error) {
+		error = swsusp_arch_resume();
+		/*
+		 * The code below is only ever reached in case of a failure.
+		 * Otherwise execution continues at place where
+		 * swsusp_arch_suspend() was called
+		 */
+		BUG_ON(!error);
+		/* This call to restore_highmem() undos the previous one */
+		restore_highmem();
+	}
+	/*
+	 * The only reason why swsusp_arch_resume() can fail is memory being
+	 * very tight, so we have to free it as soon as we can to avoid
+	 * subsequent failures
+	 */
+	swsusp_free();
+	restore_processor_state();
+	touch_softlockup_watchdog();
+
+	sysdev_resume();
+
+ Enable_irqs:
+	local_irq_enable();
+
+ Enable_cpus:
+	enable_nonboot_cpus();
+
+ Cleanup:
+	platform_restore_cleanup(platform_mode);
+
+	dpm_resume_noirq(PMSG_RECOVER);
+
+	return error;
+}
+
+/**
+ *	hibernation_restore - quiesce devices and restore the hibernation
+ *	snapshot image.  If successful, control returns in hibernation_snaphot()
+ *	@platform_mode - if set, use the platform driver, if available, to
+ *			 prepare the platform firmware for the transition.
+ *
+ *	Must be called with pm_mutex held
+ */
+
+int hibernation_restore(int platform_mode)
+{
+	int error;
+
+	pm_prepare_console();
+	suspend_console();
+	error = dpm_suspend_start(PMSG_QUIESCE);
+	if (!error) {
+		error = resume_target_kernel(platform_mode);
+		dpm_resume_end(PMSG_RECOVER);
+	}
+	resume_console();
+	pm_restore_console();
+	return error;
+}
+
+/**
+ *	hibernation_platform_enter - enter the hibernation state using the
+ *	platform driver (if available)
+ */
+
+int hibernation_platform_enter(void)
+{
+	int error;
+
+	if (!hibernation_ops)
+		return -ENOSYS;
+
+	/*
+	 * We have cancelled the power transition by running
+	 * hibernation_ops->finish() before saving the image, so we should let
+	 * the firmware know that we're going to enter the sleep state after all
+	 */
+	error = hibernation_ops->begin();
+	if (error)
+		goto Close;
+
+	entering_platform_hibernation = true;
+	suspend_console();
+	error = dpm_suspend_start(PMSG_HIBERNATE);
+	if (error) {
+		if (hibernation_ops->recover)
+			hibernation_ops->recover();
+		goto Resume_devices;
+	}
+
+	error = dpm_suspend_noirq(PMSG_HIBERNATE);
+	if (error)
+		goto Resume_devices;
+
+	error = hibernation_ops->prepare();
+	if (error)
+		goto Platofrm_finish;
+
+	error = disable_nonboot_cpus();
+	if (error)
+		goto Platofrm_finish;
+
+	local_irq_disable();
+	sysdev_suspend(PMSG_HIBERNATE);
+	hibernation_ops->enter();
+	/* We should never get here */
+	while (1);
+
+	/*
+	 * We don't need to reenable the nonboot CPUs or resume consoles, since
+	 * the system is going to be halted anyway.
+	 */
+ Platofrm_finish:
+	hibernation_ops->finish();
+
+	dpm_suspend_noirq(PMSG_RESTORE);
+
+ Resume_devices:
+	entering_platform_hibernation = false;
+	dpm_resume_end(PMSG_RESTORE);
+	resume_console();
+
+ Close:
+	hibernation_ops->end();
+
+	return error;
+}
+
+/**
+ *	power_down - Shut the machine down for hibernation.
+ *
+ *	Use the platform driver, if configured so; otherwise try
+ *	to power off or reboot.
+ */
+
+static void power_down(void)
+{
+	switch (hibernation_mode) {
+	case HIBERNATION_TEST:
+	case HIBERNATION_TESTPROC:
+		break;
+	case HIBERNATION_REBOOT:
+		kernel_restart(NULL);
+		break;
+	case HIBERNATION_PLATFORM:
+		hibernation_platform_enter();
+	case HIBERNATION_SHUTDOWN:
+		kernel_power_off();
+		break;
+	}
+	kernel_halt();
+	/*
+	 * Valid image is on the disk, if we continue we risk serious data
+	 * corruption after resume.
+	 */
+	printk(KERN_CRIT "PM: Please power down manually\n");
+	while(1);
+}
+
+static int prepare_processes(void)
+{
+	int error = 0;
+
+	if (freeze_processes()) {
+		error = -EBUSY;
+		thaw_processes();
+	}
+	return error;
+}
+
+/**
+ *	hibernate - The granpappy of the built-in hibernation management
+ */
+
+int hibernate(void)
+{
+	int error;
+
+	mutex_lock(&pm_mutex);
+	/* The snapshot device should not be opened while we're running */
+	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
+		error = -EBUSY;
+		goto Unlock;
+	}
+
+	pm_prepare_console();
+	error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
+	if (error)
+		goto Exit;
+
+	error = usermodehelper_disable();
+	if (error)
+		goto Exit;
+
+	/* Allocate memory management structures */
+	error = create_basic_memory_bitmaps();
+	if (error)
+		goto Exit;
+
+	printk(KERN_INFO "PM: Syncing filesystems ... ");
+	sys_sync();
+	printk("done.\n");
+
+	error = prepare_processes();
+	if (error)
+		goto Finish;
+
+	if (hibernation_test(TEST_FREEZER))
+		goto Thaw;
+
+	if (hibernation_testmode(HIBERNATION_TESTPROC))
+		goto Thaw;
+
+	error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
+	if (in_suspend && !error) {
+		unsigned int flags = 0;
+
+		if (hibernation_mode == HIBERNATION_PLATFORM)
+			flags |= SF_PLATFORM_MODE;
+		pr_debug("PM: writing image.\n");
+		error = swsusp_write(flags);
+		swsusp_free();
+		if (!error)
+			power_down();
+	} else {
+		pr_debug("PM: Image restored successfully.\n");
+		swsusp_free();
+	}
+ Thaw:
+	thaw_processes();
+ Finish:
+	free_basic_memory_bitmaps();
+	usermodehelper_enable();
+ Exit:
+	pm_notifier_call_chain(PM_POST_HIBERNATION);
+	pm_restore_console();
+	atomic_inc(&snapshot_device_available);
+ Unlock:
+	mutex_unlock(&pm_mutex);
+	return error;
+}
+
+
+/**
+ *	software_resume - Resume from a saved image.
+ *
+ *	Called as a late_initcall (so all devices are discovered and
+ *	initialized), we call swsusp to see if we have a saved image or not.
+ *	If so, we quiesce devices, the restore the saved image. We will
+ *	return above (in hibernate() ) if everything goes well.
+ *	Otherwise, we fail gracefully and return to the normally
+ *	scheduled program.
+ *
+ */
+
+static int software_resume(void)
+{
+	int error;
+	unsigned int flags;
+
+	/*
+	 * If the user said "noresume".. bail out early.
+	 */
+	if (noresume)
+		return 0;
+
+	/*
+	 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
+	 * is configured into the kernel. Since the regular hibernate
+	 * trigger path is via sysfs which takes a buffer mutex before
+	 * calling hibernate functions (which take pm_mutex) this can
+	 * cause lockdep to complain about a possible ABBA deadlock
+	 * which cannot happen since we're in the boot code here and
+	 * sysfs can't be invoked yet. Therefore, we use a subclass
+	 * here to avoid lockdep complaining.
+	 */
+	mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
+
+	if (swsusp_resume_device)
+		goto Check_image;
+
+	if (!strlen(resume_file)) {
+		error = -ENOENT;
+		goto Unlock;
+	}
+
+	pr_debug("PM: Checking image partition %s\n", resume_file);
+
+	/* Check if the device is there */
+	swsusp_resume_device = name_to_dev_t(resume_file);
+	if (!swsusp_resume_device) {
+		/*
+		 * Some device discovery might still be in progress; we need
+		 * to wait for this to finish.
+		 */
+		wait_for_device_probe();
+		/*
+		 * We can't depend on SCSI devices being available after loading
+		 * one of their modules until scsi_complete_async_scans() is
+		 * called and the resume device usually is a SCSI one.
+		 */
+		scsi_complete_async_scans();
+
+		swsusp_resume_device = name_to_dev_t(resume_file);
+		if (!swsusp_resume_device) {
+			error = -ENODEV;
+			goto Unlock;
+		}
+	}
+
+ Check_image:
+	pr_debug("PM: Resume from partition %d:%d\n",
+		MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
+
+	pr_debug("PM: Checking hibernation image.\n");
+	error = swsusp_check();
+	if (error)
+		goto Unlock;
+
+	/* The snapshot device should not be opened while we're running */
+	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
+		error = -EBUSY;
+		goto Unlock;
+	}
+
+	pm_prepare_console();
+	error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
+	if (error)
+		goto Finish;
+
+	error = usermodehelper_disable();
+	if (error)
+		goto Finish;
+
+	error = create_basic_memory_bitmaps();
+	if (error)
+		goto Finish;
+
+	pr_debug("PM: Preparing processes for restore.\n");
+	error = prepare_processes();
+	if (error) {
+		swsusp_close(FMODE_READ);
+		goto Done;
+	}
+
+	pr_debug("PM: Reading hibernation image.\n");
+
+	error = swsusp_read(&flags);
+	if (!error)
+		hibernation_restore(flags & SF_PLATFORM_MODE);
+
+	printk(KERN_ERR "PM: Restore failed, recovering.\n");
+	swsusp_free();
+	thaw_processes();
+ Done:
+	free_basic_memory_bitmaps();
+	usermodehelper_enable();
+ Finish:
+	pm_notifier_call_chain(PM_POST_RESTORE);
+	pm_restore_console();
+	atomic_inc(&snapshot_device_available);
+	/* For success case, the suspend path will release the lock */
+ Unlock:
+	mutex_unlock(&pm_mutex);
+	pr_debug("PM: Resume from disk failed.\n");
+	return error;
+}
+
+late_initcall(software_resume);
+
+
+static const char * const hibernation_modes[] = {
+	[HIBERNATION_PLATFORM]	= "platform",
+	[HIBERNATION_SHUTDOWN]	= "shutdown",
+	[HIBERNATION_REBOOT]	= "reboot",
+	[HIBERNATION_TEST]	= "test",
+	[HIBERNATION_TESTPROC]	= "testproc",
+};
+
+/**
+ *	disk - Control hibernation mode
+ *
+ *	Suspend-to-disk can be handled in several ways. We have a few options
+ *	for putting the system to sleep - using the platform driver (e.g. ACPI
+ *	or other hibernation_ops), powering off the system or rebooting the
+ *	system (for testing) as well as the two test modes.
+ *
+ *	The system can support 'platform', and that is known a priori (and
+ *	encoded by the presence of hibernation_ops). However, the user may
+ *	choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
+ *	test modes, 'test' or 'testproc'.
+ *
+ *	show() will display what the mode is currently set to.
+ *	store() will accept one of
+ *
+ *	'platform'
+ *	'shutdown'
+ *	'reboot'
+ *	'test'
+ *	'testproc'
+ *
+ *	It will only change to 'platform' if the system
+ *	supports it (as determined by having hibernation_ops).
+ */
+
+static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
+			 char *buf)
+{
+	int i;
+	char *start = buf;
+
+	for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
+		if (!hibernation_modes[i])
+			continue;
+		switch (i) {
+		case HIBERNATION_SHUTDOWN:
+		case HIBERNATION_REBOOT:
+		case HIBERNATION_TEST:
+		case HIBERNATION_TESTPROC:
+			break;
+		case HIBERNATION_PLATFORM:
+			if (hibernation_ops)
+				break;
+			/* not a valid mode, continue with loop */
+			continue;
+		}
+		if (i == hibernation_mode)
+			buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
+		else
+			buf += sprintf(buf, "%s ", hibernation_modes[i]);
+	}
+	buf += sprintf(buf, "\n");
+	return buf-start;
+}
+
+
+static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
+			  const char *buf, size_t n)
+{
+	int error = 0;
+	int i;
+	int len;
+	char *p;
+	int mode = HIBERNATION_INVALID;
+
+	p = memchr(buf, '\n', n);
+	len = p ? p - buf : n;
+
+	mutex_lock(&pm_mutex);
+	for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
+		if (len == strlen(hibernation_modes[i])
+		    && !strncmp(buf, hibernation_modes[i], len)) {
+			mode = i;
+			break;
+		}
+	}
+	if (mode != HIBERNATION_INVALID) {
+		switch (mode) {
+		case HIBERNATION_SHUTDOWN:
+		case HIBERNATION_REBOOT:
+		case HIBERNATION_TEST:
+		case HIBERNATION_TESTPROC:
+			hibernation_mode = mode;
+			break;
+		case HIBERNATION_PLATFORM:
+			if (hibernation_ops)
+				hibernation_mode = mode;
+			else
+				error = -EINVAL;
+		}
+	} else
+		error = -EINVAL;
+
+	if (!error)
+		pr_debug("PM: Hibernation mode set to '%s'\n",
+			 hibernation_modes[mode]);
+	mutex_unlock(&pm_mutex);
+	return error ? error : n;
+}
+
+power_attr(disk);
+
+static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
+			   char *buf)
+{
+	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
+		       MINOR(swsusp_resume_device));
+}
+
+static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
+			    const char *buf, size_t n)
+{
+	unsigned int maj, min;
+	dev_t res;
+	int ret = -EINVAL;
+
+	if (sscanf(buf, "%u:%u", &maj, &min) != 2)
+		goto out;
+
+	res = MKDEV(maj,min);
+	if (maj != MAJOR(res) || min != MINOR(res))
+		goto out;
+
+	mutex_lock(&pm_mutex);
+	swsusp_resume_device = res;
+	mutex_unlock(&pm_mutex);
+	printk(KERN_INFO "PM: Starting manual resume from disk\n");
+	noresume = 0;
+	software_resume();
+	ret = n;
+ out:
+	return ret;
+}
+
+power_attr(resume);
+
+static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
+			       char *buf)
+{
+	return sprintf(buf, "%lu\n", image_size);
+}
+
+static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
+				const char *buf, size_t n)
+{
+	unsigned long size;
+
+	if (sscanf(buf, "%lu", &size) == 1) {
+		image_size = size;
+		return n;
+	}
+
+	return -EINVAL;
+}
+
+power_attr(image_size);
+
+static struct attribute * g[] = {
+	&disk_attr.attr,
+	&resume_attr.attr,
+	&image_size_attr.attr,
+	NULL,
+};
+
+
+static struct attribute_group attr_group = {
+	.attrs = g,
+};
+
+
+static int __init pm_disk_init(void)
+{
+	return sysfs_create_group(power_kobj, &attr_group);
+}
+
+core_initcall(pm_disk_init);
+
+
+static int __init resume_setup(char *str)
+{
+	if (noresume)
+		return 1;
+
+	strncpy( resume_file, str, 255 );
+	return 1;
+}
+
+static int __init resume_offset_setup(char *str)
+{
+	unsigned long long offset;
+
+	if (noresume)
+		return 1;
+
+	if (sscanf(str, "%llu", &offset) == 1)
+		swsusp_resume_block = offset;
+
+	return 1;
+}
+
+static int __init noresume_setup(char *str)
+{
+	noresume = 1;
+	return 1;
+}
+
+__setup("noresume", noresume_setup);
+__setup("resume_offset=", resume_offset_setup);
+__setup("resume=", resume_setup);