[net-next-2.6.git] / kernel / power / user.c

/*
 * linux/kernel/power/user.c
 *
 * This file provides the user space interface for software suspend/resume.
 *
 * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
 *
 * 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/miscdevice.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/pm.h>
#include <linux/fs.h>
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>
#include <scsi/scsi_scan.h>

#include <asm/uaccess.h>

#include "power.h"

/*
 * NOTE: The SNAPSHOT_SET_SWAP_FILE and SNAPSHOT_PMOPS ioctls are obsolete and
 * will be removed in the future.  They are only preserved here for
 * compatibility with existing userland utilities.
 */
#define SNAPSHOT_SET_SWAP_FILE	_IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
#define SNAPSHOT_PMOPS		_IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)

#define PMOPS_PREPARE	1
#define PMOPS_ENTER	2
#define PMOPS_FINISH	3

/*
 * NOTE: The following ioctl definitions are wrong and have been replaced with
 * correct ones.  They are only preserved here for compatibility with existing
 * userland utilities and will be removed in the future.
 */
#define SNAPSHOT_ATOMIC_SNAPSHOT	_IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
#define SNAPSHOT_SET_IMAGE_SIZE		_IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
#define SNAPSHOT_AVAIL_SWAP		_IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
#define SNAPSHOT_GET_SWAP_PAGE		_IOR(SNAPSHOT_IOC_MAGIC, 8, void *)


#define SNAPSHOT_MINOR	231

static struct snapshot_data {
	struct snapshot_handle handle;
	int swap;
	int mode;
	char frozen;
	char ready;
	char platform_support;
} snapshot_state;

atomic_t snapshot_device_available = ATOMIC_INIT(1);

static int snapshot_open(struct inode *inode, struct file *filp)
{
	struct snapshot_data *data;
	int error;

	mutex_lock(&pm_mutex);

	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
		error = -EBUSY;
		goto Unlock;
	}

	if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
		atomic_inc(&snapshot_device_available);
		error = -ENOSYS;
		goto Unlock;
	}
	if(create_basic_memory_bitmaps()) {
		atomic_inc(&snapshot_device_available);
		error = -ENOMEM;
		goto Unlock;
	}
	nonseekable_open(inode, filp);
	data = &snapshot_state;
	filp->private_data = data;
	memset(&data->handle, 0, sizeof(struct snapshot_handle));
	if ((filp->f_flags & O_ACCMODE) == O_RDONLY) {
		/* Hibernating.  The image device should be accessible. */
		data->swap = swsusp_resume_device ?
			swap_type_of(swsusp_resume_device, 0, NULL) : -1;
		data->mode = O_RDONLY;
		error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
		if (error)
			pm_notifier_call_chain(PM_POST_HIBERNATION);
	} else {
		/*
		 * Resuming.  We may need to wait for the image device to
		 * appear.
		 */
		wait_for_device_probe();
		scsi_complete_async_scans();

		data->swap = -1;
		data->mode = O_WRONLY;
		error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
		if (error)
			pm_notifier_call_chain(PM_POST_RESTORE);
	}
	if (error)
		atomic_inc(&snapshot_device_available);
	data->frozen = 0;
	data->ready = 0;
	data->platform_support = 0;

 Unlock:
	mutex_unlock(&pm_mutex);

	return error;
}

static int snapshot_release(struct inode *inode, struct file *filp)
{
	struct snapshot_data *data;

	mutex_lock(&pm_mutex);

	swsusp_free();
	free_basic_memory_bitmaps();
	data = filp->private_data;
	free_all_swap_pages(data->swap);
	if (data->frozen)
		thaw_processes();
	pm_notifier_call_chain(data->mode == O_WRONLY ?
			PM_POST_HIBERNATION : PM_POST_RESTORE);
	atomic_inc(&snapshot_device_available);

	mutex_unlock(&pm_mutex);

	return 0;
}

static ssize_t snapshot_read(struct file *filp, char __user *buf,
                             size_t count, loff_t *offp)
{
	struct snapshot_data *data;
	ssize_t res;
	loff_t pg_offp = *offp & ~PAGE_MASK;

	mutex_lock(&pm_mutex);

	data = filp->private_data;
	if (!data->ready) {
		res = -ENODATA;
		goto Unlock;
	}
	if (!pg_offp) { /* on page boundary? */
		res = snapshot_read_next(&data->handle);
		if (res <= 0)
			goto Unlock;
	} else {
		res = PAGE_SIZE - pg_offp;
	}

	res = simple_read_from_buffer(buf, count, &pg_offp,
			data_of(data->handle), res);
	if (res > 0)
		*offp += res;

 Unlock:
	mutex_unlock(&pm_mutex);

	return res;
}

static ssize_t snapshot_write(struct file *filp, const char __user *buf,
                              size_t count, loff_t *offp)
{
	struct snapshot_data *data;
	ssize_t res;
	loff_t pg_offp = *offp & ~PAGE_MASK;

	mutex_lock(&pm_mutex);

	data = filp->private_data;

	if (!pg_offp) {
		res = snapshot_write_next(&data->handle);
		if (res <= 0)
			goto unlock;
	} else {
		res = PAGE_SIZE - pg_offp;
	}

	res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,
			buf, count);
	if (res > 0)
		*offp += res;
unlock:
	mutex_unlock(&pm_mutex);

	return res;
}

static void snapshot_deprecated_ioctl(unsigned int cmd)
{
	if (printk_ratelimit())
		printk(KERN_NOTICE "%pf: ioctl '%.8x' is deprecated and will "
				"be removed soon, update your suspend-to-disk "
				"utilities\n",
				__builtin_return_address(0), cmd);
}

static long snapshot_ioctl(struct file *filp, unsigned int cmd,
							unsigned long arg)
{
	int error = 0;
	struct snapshot_data *data;
	loff_t size;
	sector_t offset;

	if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
		return -ENOTTY;
	if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR)
		return -ENOTTY;
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (!mutex_trylock(&pm_mutex))
		return -EBUSY;

	data = filp->private_data;

	switch (cmd) {

	case SNAPSHOT_FREEZE:
		if (data->frozen)
			break;

		printk("Syncing filesystems ... ");
		sys_sync();
		printk("done.\n");

		error = usermodehelper_disable();
		if (error)
			break;

		error = freeze_processes();
		if (error) {
			thaw_processes();
			usermodehelper_enable();
		}
		if (!error)
			data->frozen = 1;
		break;

	case SNAPSHOT_UNFREEZE:
		if (!data->frozen || data->ready)
			break;
		thaw_processes();
		usermodehelper_enable();
		data->frozen = 0;
		break;

	case SNAPSHOT_ATOMIC_SNAPSHOT:
		snapshot_deprecated_ioctl(cmd);
	case SNAPSHOT_CREATE_IMAGE:
		if (data->mode != O_RDONLY || !data->frozen  || data->ready) {
			error = -EPERM;
			break;
		}
		error = hibernation_snapshot(data->platform_support);
		if (!error)
			error = put_user(in_suspend, (int __user *)arg);
		if (!error)
			data->ready = 1;
		break;

	case SNAPSHOT_ATOMIC_RESTORE:
		snapshot_write_finalize(&data->handle);
		if (data->mode != O_WRONLY || !data->frozen ||
		    !snapshot_image_loaded(&data->handle)) {
			error = -EPERM;
			break;
		}
		error = hibernation_restore(data->platform_support);
		break;

	case SNAPSHOT_FREE:
		swsusp_free();
		memset(&data->handle, 0, sizeof(struct snapshot_handle));
		data->ready = 0;
		break;

	case SNAPSHOT_SET_IMAGE_SIZE:
		snapshot_deprecated_ioctl(cmd);
	case SNAPSHOT_PREF_IMAGE_SIZE:
		image_size = arg;
		break;

	case SNAPSHOT_GET_IMAGE_SIZE:
		if (!data->ready) {
			error = -ENODATA;
			break;
		}
		size = snapshot_get_image_size();
		size <<= PAGE_SHIFT;
		error = put_user(size, (loff_t __user *)arg);
		break;

	case SNAPSHOT_AVAIL_SWAP:
		snapshot_deprecated_ioctl(cmd);
	case SNAPSHOT_AVAIL_SWAP_SIZE:
		size = count_swap_pages(data->swap, 1);
		size <<= PAGE_SHIFT;
		error = put_user(size, (loff_t __user *)arg);
		break;

	case SNAPSHOT_GET_SWAP_PAGE:
		snapshot_deprecated_ioctl(cmd);
	case SNAPSHOT_ALLOC_SWAP_PAGE:
		if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
			error = -ENODEV;
			break;
		}
		offset = alloc_swapdev_block(data->swap);
		if (offset) {
			offset <<= PAGE_SHIFT;
			error = put_user(offset, (loff_t __user *)arg);
		} else {
			error = -ENOSPC;
		}
		break;

	case SNAPSHOT_FREE_SWAP_PAGES:
		if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
			error = -ENODEV;
			break;
		}
		free_all_swap_pages(data->swap);
		break;

	case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */
		snapshot_deprecated_ioctl(cmd);
		if (!swsusp_swap_in_use()) {
			/*
			 * User space encodes device types as two-byte values,
			 * so we need to recode them
			 */
			if (old_decode_dev(arg)) {
				data->swap = swap_type_of(old_decode_dev(arg),
							0, NULL);
				if (data->swap < 0)
					error = -ENODEV;
			} else {
				data->swap = -1;
				error = -EINVAL;
			}
		} else {
			error = -EPERM;
		}
		break;

	case SNAPSHOT_S2RAM:
		if (!data->frozen) {
			error = -EPERM;
			break;
		}
		/*
		 * Tasks are frozen and the notifiers have been called with
		 * PM_HIBERNATION_PREPARE
		 */
		error = suspend_devices_and_enter(PM_SUSPEND_MEM);
		break;

	case SNAPSHOT_PLATFORM_SUPPORT:
		data->platform_support = !!arg;
		break;

	case SNAPSHOT_POWER_OFF:
		if (data->platform_support)
			error = hibernation_platform_enter();
		break;

	case SNAPSHOT_PMOPS: /* This ioctl is deprecated */
		snapshot_deprecated_ioctl(cmd);
		error = -EINVAL;

		switch (arg) {

		case PMOPS_PREPARE:
			data->platform_support = 1;
			error = 0;
			break;

		case PMOPS_ENTER:
			if (data->platform_support)
				error = hibernation_platform_enter();
			break;

		case PMOPS_FINISH:
			if (data->platform_support)
				error = 0;
			break;

		default:
			printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg);

		}
		break;

	case SNAPSHOT_SET_SWAP_AREA:
		if (swsusp_swap_in_use()) {
			error = -EPERM;
		} else {
			struct resume_swap_area swap_area;
			dev_t swdev;

			error = copy_from_user(&swap_area, (void __user *)arg,
					sizeof(struct resume_swap_area));
			if (error) {
				error = -EFAULT;
				break;
			}

			/*
			 * User space encodes device types as two-byte values,
			 * so we need to recode them
			 */
			swdev = new_decode_dev(swap_area.dev);
			if (swdev) {
				offset = swap_area.offset;
				data->swap = swap_type_of(swdev, offset, NULL);
				if (data->swap < 0)
					error = -ENODEV;
			} else {
				data->swap = -1;
				error = -EINVAL;
			}
		}
		break;

	default:
		error = -ENOTTY;

	}

	mutex_unlock(&pm_mutex);

	return error;
}

static const struct file_operations snapshot_fops = {
	.open = snapshot_open,
	.release = snapshot_release,
	.read = snapshot_read,
	.write = snapshot_write,
	.llseek = no_llseek,
	.unlocked_ioctl = snapshot_ioctl,
};

static struct miscdevice snapshot_device = {
	.minor = SNAPSHOT_MINOR,
	.name = "snapshot",
	.fops = &snapshot_fops,
};

static int __init snapshot_device_init(void)
{
	return misc_register(&snapshot_device);
};

device_initcall(snapshot_device_init);
Commit	Line	Data
6e1819d6 RW	1	/*
	2	* linux/kernel/power/user.c
	3	*
	4	* This file provides the user space interface for software suspend/resume.
	5	*
	6	* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
	7	*
	8	* This file is released under the GPLv2.
	9	*
	10	*/
	11
	12	#include <linux/suspend.h>
	13	#include <linux/syscalls.h>
3592695c	14	#include <linux/reboot.h>
6e1819d6 RW	15	#include <linux/string.h>
	16	#include <linux/device.h>
	17	#include <linux/miscdevice.h>
	18	#include <linux/mm.h>
	19	#include <linux/swap.h>
	20	#include <linux/swapops.h>
	21	#include <linux/pm.h>
	22	#include <linux/fs.h>
97c7801c	23	#include <linux/console.h>
e3920fb4	24	#include <linux/cpu.h>
7dfb7103	25	#include <linux/freezer.h>
c7510859	26	#include <scsi/scsi_scan.h>
6e1819d6 RW	27
	28	#include <asm/uaccess.h>
	29
	30	#include "power.h"
	31
eb57c1cf	32	/*
96f73749 RW	33	* NOTE: The SNAPSHOT_SET_SWAP_FILE and SNAPSHOT_PMOPS ioctls are obsolete and
	34	* will be removed in the future. They are only preserved here for
	35	* compatibility with existing userland utilities.
eb57c1cf	36	*/
96f73749	37	#define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
eb57c1cf RW	38	#define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
	39
	40	#define PMOPS_PREPARE 1
	41	#define PMOPS_ENTER 2
	42	#define PMOPS_FINISH 3
	43
cc5d207c RW	44	/*
	45	* NOTE: The following ioctl definitions are wrong and have been replaced with
	46	* correct ones. They are only preserved here for compatibility with existing
	47	* userland utilities and will be removed in the future.
	48	*/
	49	#define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
	50	#define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
	51	#define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
	52	#define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
	53
eb57c1cf	54
6e1819d6 RW	55	#define SNAPSHOT_MINOR 231
	56
	57	static struct snapshot_data {
	58	struct snapshot_handle handle;
	59	int swap;
6e1819d6 RW	60	int mode;
	61	char frozen;
	62	char ready;
eb57c1cf	63	char platform_support;
6e1819d6 RW	64	} snapshot_state;
6e1819d6 RW	65
0709db60	66	atomic_t snapshot_device_available = ATOMIC_INIT(1);
6e1819d6 RW	67
	68	static int snapshot_open(struct inode inode, struct file filp)
	69	{
	70	struct snapshot_data *data;
c3e94d89	71	int error;
6e1819d6	72
25f2f3da RW	73	mutex_lock(&pm_mutex);
	74
	75	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
	76	error = -EBUSY;
	77	goto Unlock;
	78	}
6e1819d6	79
1525a2ad	80	if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
0709db60	81	atomic_inc(&snapshot_device_available);
25f2f3da RW	82	error = -ENOSYS;
25f2f3da RW	83	goto Unlock;
1525a2ad RW	84	}
1525a2ad RW	85	if(create_basic_memory_bitmaps()) {
0709db60	86	atomic_inc(&snapshot_device_available);
25f2f3da RW	87	error = -ENOMEM;
25f2f3da RW	88	goto Unlock;
1525a2ad	89	}
6e1819d6 RW	90	nonseekable_open(inode, filp);
	91	data = &snapshot_state;
	92	filp->private_data = data;
	93	memset(&data->handle, 0, sizeof(struct snapshot_handle));
	94	if ((filp->f_flags & O_ACCMODE) == O_RDONLY) {
c7510859	95	/* Hibernating. The image device should be accessible. */
915bae9e	96	data->swap = swsusp_resume_device ?
7bf23687	97	swap_type_of(swsusp_resume_device, 0, NULL) : -1;
6e1819d6	98	data->mode = O_RDONLY;
ebae2604	99	error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
c3e94d89	100	if (error)
ebae2604	101	pm_notifier_call_chain(PM_POST_HIBERNATION);
6e1819d6	102	} else {
c7510859 RW	103	/*
	104	* Resuming. We may need to wait for the image device to
	105	* appear.
	106	*/
	107	wait_for_device_probe();
	108	scsi_complete_async_scans();
	109
6e1819d6 RW	110	data->swap = -1;
6e1819d6 RW	111	data->mode = O_WRONLY;
ebae2604	112	error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
c3e94d89	113	if (error)
ebae2604	114	pm_notifier_call_chain(PM_POST_RESTORE);
c3e94d89	115	}
25f2f3da	116	if (error)
c3e94d89	117	atomic_inc(&snapshot_device_available);
6e1819d6 RW	118	data->frozen = 0;
6e1819d6 RW	119	data->ready = 0;
eb57c1cf	120	data->platform_support = 0;
6e1819d6	121
25f2f3da RW	122	Unlock:
	123	mutex_unlock(&pm_mutex);
	124
	125	return error;
6e1819d6 RW	126	}
	127
	128	static int snapshot_release(struct inode inode, struct file filp)
	129	{
	130	struct snapshot_data *data;
	131
25f2f3da RW	132	mutex_lock(&pm_mutex);
25f2f3da RW	133
6e1819d6	134	swsusp_free();
74dfd666	135	free_basic_memory_bitmaps();
6e1819d6	136	data = filp->private_data;
d1d241cc	137	free_all_swap_pages(data->swap);
25f2f3da	138	if (data->frozen)
6e1819d6	139	thaw_processes();
c3e94d89 AS	140	pm_notifier_call_chain(data->mode == O_WRONLY ?
c3e94d89 AS	141	PM_POST_HIBERNATION : PM_POST_RESTORE);
0709db60	142	atomic_inc(&snapshot_device_available);
25f2f3da RW	143
	144	mutex_unlock(&pm_mutex);
	145
6e1819d6 RW	146	return 0;
	147	}
	148
	149	static ssize_t snapshot_read(struct file filp, char __user buf,
	150	size_t count, loff_t *offp)
	151	{
	152	struct snapshot_data *data;
	153	ssize_t res;
d3c1b24c	154	loff_t pg_offp = *offp & ~PAGE_MASK;
6e1819d6	155
25f2f3da RW	156	mutex_lock(&pm_mutex);
25f2f3da RW	157
6e1819d6	158	data = filp->private_data;
25f2f3da RW	159	if (!data->ready) {
	160	res = -ENODATA;
	161	goto Unlock;
	162	}
d3c1b24c JS	163	if (!pg_offp) { /* on page boundary? */
	164	res = snapshot_read_next(&data->handle);
	165	if (res <= 0)
	166	goto Unlock;
	167	} else {
	168	res = PAGE_SIZE - pg_offp;
6e1819d6	169	}
25f2f3da	170
d3c1b24c JS	171	res = simple_read_from_buffer(buf, count, &pg_offp,
	172	data_of(data->handle), res);
	173	if (res > 0)
	174	*offp += res;
	175
25f2f3da RW	176	Unlock:
	177	mutex_unlock(&pm_mutex);
	178
6e1819d6 RW	179	return res;
	180	}
	181
	182	static ssize_t snapshot_write(struct file filp, const char __user buf,
	183	size_t count, loff_t *offp)
	184	{
	185	struct snapshot_data *data;
	186	ssize_t res;
d3c1b24c	187	loff_t pg_offp = *offp & ~PAGE_MASK;
6e1819d6	188
25f2f3da RW	189	mutex_lock(&pm_mutex);
25f2f3da RW	190
6e1819d6	191	data = filp->private_data;
d3c1b24c JS	192
	193	if (!pg_offp) {
	194	res = snapshot_write_next(&data->handle);
	195	if (res <= 0)
	196	goto unlock;
	197	} else {
	198	res = PAGE_SIZE - pg_offp;
6e1819d6	199	}
25f2f3da	200
d3c1b24c JS	201	res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,
	202	buf, count);
	203	if (res > 0)
	204	*offp += res;
	205	unlock:
25f2f3da RW	206	mutex_unlock(&pm_mutex);
25f2f3da RW	207
6e1819d6 RW	208	return res;
	209	}
	210
b694e52e JS	211	static void snapshot_deprecated_ioctl(unsigned int cmd)
	212	{
	213	if (printk_ratelimit())
	214	printk(KERN_NOTICE "%pf: ioctl '%.8x' is deprecated and will "
	215	"be removed soon, update your suspend-to-disk "
	216	"utilities\n",
	217	__builtin_return_address(0), cmd);
	218	}
	219
52d11025 AC	220	static long snapshot_ioctl(struct file *filp, unsigned int cmd,
52d11025 AC	221	unsigned long arg)
6e1819d6 RW	222	{
	223	int error = 0;
	224	struct snapshot_data *data;
af508b34	225	loff_t size;
3aef83e0	226	sector_t offset;
6e1819d6 RW	227
	228	if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
	229	return -ENOTTY;
	230	if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR)
	231	return -ENOTTY;
	232	if (!capable(CAP_SYS_ADMIN))
	233	return -EPERM;
	234
25f2f3da RW	235	if (!mutex_trylock(&pm_mutex))
25f2f3da RW	236	return -EBUSY;
6e1819d6	237
25f2f3da	238	data = filp->private_data;
52d11025	239
6e1819d6 RW	240	switch (cmd) {
	241
	242	case SNAPSHOT_FREEZE:
	243	if (data->frozen)
	244	break;
1bfcf130	245
c3e94d89 AS	246	printk("Syncing filesystems ... ");
	247	sys_sync();
	248	printk("done.\n");
	249
1bfcf130	250	error = usermodehelper_disable();
b10d9117	251	if (error)
1bfcf130 RW	252	break;
	253
	254	error = freeze_processes();
	255	if (error) {
c3e94d89	256	thaw_processes();
1bfcf130 RW	257	usermodehelper_enable();
1bfcf130 RW	258	}
6e1819d6 RW	259	if (!error)
	260	data->frozen = 1;
	261	break;
	262
	263	case SNAPSHOT_UNFREEZE:
2f41dddb	264	if (!data->frozen \|\| data->ready)
6e1819d6	265	break;
6e1819d6	266	thaw_processes();
1bfcf130	267	usermodehelper_enable();
6e1819d6 RW	268	data->frozen = 0;
	269	break;
	270
	271	case SNAPSHOT_ATOMIC_SNAPSHOT:
b694e52e JS	272	snapshot_deprecated_ioctl(cmd);
b694e52e JS	273	case SNAPSHOT_CREATE_IMAGE:
6e1819d6 RW	274	if (data->mode != O_RDONLY \|\| !data->frozen \|\| data->ready) {
	275	error = -EPERM;
	276	break;
	277	}
eb57c1cf	278	error = hibernation_snapshot(data->platform_support);
6e1819d6	279	if (!error)
cc5d207c	280	error = put_user(in_suspend, (int __user *)arg);
6e1819d6 RW	281	if (!error)
	282	data->ready = 1;
	283	break;
	284
	285	case SNAPSHOT_ATOMIC_RESTORE:
8357376d	286	snapshot_write_finalize(&data->handle);
6e1819d6 RW	287	if (data->mode != O_WRONLY \|\| !data->frozen \|\|
	288	!snapshot_image_loaded(&data->handle)) {
	289	error = -EPERM;
	290	break;
	291	}
eb57c1cf	292	error = hibernation_restore(data->platform_support);
6e1819d6 RW	293	break;
	294
	295	case SNAPSHOT_FREE:
	296	swsusp_free();
	297	memset(&data->handle, 0, sizeof(struct snapshot_handle));
	298	data->ready = 0;
	299	break;
	300
	301	case SNAPSHOT_SET_IMAGE_SIZE:
b694e52e JS	302	snapshot_deprecated_ioctl(cmd);
b694e52e JS	303	case SNAPSHOT_PREF_IMAGE_SIZE:
6e1819d6 RW	304	image_size = arg;
	305	break;
	306
af508b34 RW	307	case SNAPSHOT_GET_IMAGE_SIZE:
	308	if (!data->ready) {
	309	error = -ENODATA;
	310	break;
	311	}
	312	size = snapshot_get_image_size();
	313	size <<= PAGE_SHIFT;
	314	error = put_user(size, (loff_t __user *)arg);
	315	break;
	316
6e1819d6	317	case SNAPSHOT_AVAIL_SWAP:
b694e52e JS	318	snapshot_deprecated_ioctl(cmd);
b694e52e JS	319	case SNAPSHOT_AVAIL_SWAP_SIZE:
af508b34 RW	320	size = count_swap_pages(data->swap, 1);
	321	size <<= PAGE_SHIFT;
	322	error = put_user(size, (loff_t __user *)arg);
6e1819d6 RW	323	break;
	324
	325	case SNAPSHOT_GET_SWAP_PAGE:
b694e52e JS	326	snapshot_deprecated_ioctl(cmd);
b694e52e JS	327	case SNAPSHOT_ALLOC_SWAP_PAGE:
6e1819d6 RW	328	if (data->swap < 0 \|\| data->swap >= MAX_SWAPFILES) {
	329	error = -ENODEV;
	330	break;
	331	}
d1d241cc	332	offset = alloc_swapdev_block(data->swap);
6e1819d6 RW	333	if (offset) {
6e1819d6 RW	334	offset <<= PAGE_SHIFT;
cc5d207c	335	error = put_user(offset, (loff_t __user *)arg);
6e1819d6 RW	336	} else {
	337	error = -ENOSPC;
	338	}
	339	break;
	340
	341	case SNAPSHOT_FREE_SWAP_PAGES:
	342	if (data->swap < 0 \|\| data->swap >= MAX_SWAPFILES) {
	343	error = -ENODEV;
	344	break;
	345	}
d1d241cc	346	free_all_swap_pages(data->swap);
6e1819d6 RW	347	break;
6e1819d6 RW	348
96f73749	349	case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */
b694e52e	350	snapshot_deprecated_ioctl(cmd);
d1d241cc	351	if (!swsusp_swap_in_use()) {
6e1819d6 RW	352	/*
	353	* User space encodes device types as two-byte values,
	354	* so we need to recode them
	355	*/
	356	if (old_decode_dev(arg)) {
7bf23687 RW	357	data->swap = swap_type_of(old_decode_dev(arg),
7bf23687 RW	358	0, NULL);
6e1819d6 RW	359	if (data->swap < 0)
	360	error = -ENODEV;
	361	} else {
	362	data->swap = -1;
	363	error = -EINVAL;
	364	}
	365	} else {
	366	error = -EPERM;
	367	}
	368	break;
	369
9b238205 LT	370	case SNAPSHOT_S2RAM:
	371	if (!data->frozen) {
	372	error = -EPERM;
	373	break;
	374	}
6c961dfb RW	375	/*
	376	* Tasks are frozen and the notifiers have been called with
	377	* PM_HIBERNATION_PREPARE
	378	*/
	379	error = suspend_devices_and_enter(PM_SUSPEND_MEM);
9b238205 LT	380	break;
9b238205 LT	381
eb57c1cf RW	382	case SNAPSHOT_PLATFORM_SUPPORT:
	383	data->platform_support = !!arg;
	384	break;
	385
	386	case SNAPSHOT_POWER_OFF:
	387	if (data->platform_support)
	388	error = hibernation_platform_enter();
	389	break;
	390
	391	case SNAPSHOT_PMOPS: /* This ioctl is deprecated */
b694e52e	392	snapshot_deprecated_ioctl(cmd);
2b5b09b3 RW	393	error = -EINVAL;
2b5b09b3 RW	394
3592695c SS	395	switch (arg) {
	396
	397	case PMOPS_PREPARE:
eb57c1cf	398	data->platform_support = 1;
7777fab9	399	error = 0;
3592695c SS	400	break;
	401
	402	case PMOPS_ENTER:
eb57c1cf	403	if (data->platform_support)
7777fab9	404	error = hibernation_platform_enter();
3592695c SS	405	break;
	406
	407	case PMOPS_FINISH:
eb57c1cf	408	if (data->platform_support)
2b5b09b3	409	error = 0;
3592695c SS	410	break;
	411
	412	default:
	413	printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg);
3592695c SS	414
	415	}
	416	break;
	417
37b2ba12	418	case SNAPSHOT_SET_SWAP_AREA:
d1d241cc	419	if (swsusp_swap_in_use()) {
37b2ba12 RW	420	error = -EPERM;
	421	} else {
	422	struct resume_swap_area swap_area;
	423	dev_t swdev;
	424
	425	error = copy_from_user(&swap_area, (void __user *)arg,
	426	sizeof(struct resume_swap_area));
	427	if (error) {
	428	error = -EFAULT;
	429	break;
	430	}
	431
	432	/*
	433	* User space encodes device types as two-byte values,
	434	* so we need to recode them
	435	*/
d88d4050	436	swdev = new_decode_dev(swap_area.dev);
37b2ba12 RW	437	if (swdev) {
37b2ba12 RW	438	offset = swap_area.offset;
7bf23687	439	data->swap = swap_type_of(swdev, offset, NULL);
37b2ba12 RW	440	if (data->swap < 0)
	441	error = -ENODEV;
	442	} else {
	443	data->swap = -1;
	444	error = -EINVAL;
	445	}
	446	}
	447	break;
	448
6e1819d6 RW	449	default:
	450	error = -ENOTTY;
	451
	452	}
25f2f3da RW	453
	454	mutex_unlock(&pm_mutex);
	455
6e1819d6 RW	456	return error;
	457	}
	458
15ad7cdc	459	static const struct file_operations snapshot_fops = {
6e1819d6 RW	460	.open = snapshot_open,
	461	.release = snapshot_release,
	462	.read = snapshot_read,
	463	.write = snapshot_write,
	464	.llseek = no_llseek,
52d11025	465	.unlocked_ioctl = snapshot_ioctl,
6e1819d6 RW	466	};
	467
	468	static struct miscdevice snapshot_device = {
	469	.minor = SNAPSHOT_MINOR,
	470	.name = "snapshot",
	471	.fops = &snapshot_fops,
	472	};
	473
	474	static int __init snapshot_device_init(void)
	475	{
	476	return misc_register(&snapshot_device);
	477	};
	478
	479	device_initcall(snapshot_device_init);