[linux-2.6-block.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;

	mutex_lock(&pm_mutex);

	data = filp->private_data;
	if (!data->ready) {
		res = -ENODATA;
		goto Unlock;
	}
	res = snapshot_read_next(&data->handle, count);
	if (res > 0) {
		if (copy_to_user(buf, data_of(data->handle), res))
			res = -EFAULT;
		else
			*offp = data->handle.offset;
	}

 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;

	mutex_lock(&pm_mutex);

	data = filp->private_data;
	res = snapshot_write_next(&data->handle, count);
	if (res > 0) {
		if (copy_from_user(data_of(data->handle), buf, res))
			res = -EFAULT;
		else
			*offp = data->handle.offset;
	}

	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;
	154
25f2f3da RW	155	mutex_lock(&pm_mutex);
25f2f3da RW	156
6e1819d6	157	data = filp->private_data;
25f2f3da RW	158	if (!data->ready) {
	159	res = -ENODATA;
	160	goto Unlock;
	161	}
6e1819d6 RW	162	res = snapshot_read_next(&data->handle, count);
	163	if (res > 0) {
	164	if (copy_to_user(buf, data_of(data->handle), res))
	165	res = -EFAULT;
	166	else
	167	*offp = data->handle.offset;
	168	}
25f2f3da RW	169
	170	Unlock:
	171	mutex_unlock(&pm_mutex);
	172
6e1819d6 RW	173	return res;
	174	}
	175
	176	static ssize_t snapshot_write(struct file filp, const char __user buf,
	177	size_t count, loff_t *offp)
	178	{
	179	struct snapshot_data *data;
	180	ssize_t res;
	181
25f2f3da RW	182	mutex_lock(&pm_mutex);
25f2f3da RW	183
6e1819d6 RW	184	data = filp->private_data;
	185	res = snapshot_write_next(&data->handle, count);
	186	if (res > 0) {
	187	if (copy_from_user(data_of(data->handle), buf, res))
	188	res = -EFAULT;
	189	else
	190	*offp = data->handle.offset;
	191	}
25f2f3da RW	192
	193	mutex_unlock(&pm_mutex);
	194
6e1819d6 RW	195	return res;
	196	}
	197
b694e52e JS	198	static void snapshot_deprecated_ioctl(unsigned int cmd)
	199	{
	200	if (printk_ratelimit())
	201	printk(KERN_NOTICE "%pf: ioctl '%.8x' is deprecated and will "
	202	"be removed soon, update your suspend-to-disk "
	203	"utilities\n",
	204	__builtin_return_address(0), cmd);
	205	}
	206
52d11025 AC	207	static long snapshot_ioctl(struct file *filp, unsigned int cmd,
52d11025 AC	208	unsigned long arg)
6e1819d6 RW	209	{
	210	int error = 0;
	211	struct snapshot_data *data;
af508b34	212	loff_t size;
3aef83e0	213	sector_t offset;
6e1819d6 RW	214
	215	if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
	216	return -ENOTTY;
	217	if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR)
	218	return -ENOTTY;
	219	if (!capable(CAP_SYS_ADMIN))
	220	return -EPERM;
	221
25f2f3da RW	222	if (!mutex_trylock(&pm_mutex))
25f2f3da RW	223	return -EBUSY;
6e1819d6	224
25f2f3da	225	data = filp->private_data;
52d11025	226
6e1819d6 RW	227	switch (cmd) {
	228
	229	case SNAPSHOT_FREEZE:
	230	if (data->frozen)
	231	break;
1bfcf130	232
c3e94d89 AS	233	printk("Syncing filesystems ... ");
	234	sys_sync();
	235	printk("done.\n");
	236
1bfcf130	237	error = usermodehelper_disable();
b10d9117	238	if (error)
1bfcf130 RW	239	break;
	240
	241	error = freeze_processes();
	242	if (error) {
c3e94d89	243	thaw_processes();
1bfcf130 RW	244	usermodehelper_enable();
1bfcf130 RW	245	}
6e1819d6 RW	246	if (!error)
	247	data->frozen = 1;
	248	break;
	249
	250	case SNAPSHOT_UNFREEZE:
2f41dddb	251	if (!data->frozen \|\| data->ready)
6e1819d6	252	break;
6e1819d6	253	thaw_processes();
1bfcf130	254	usermodehelper_enable();
6e1819d6 RW	255	data->frozen = 0;
	256	break;
	257
	258	case SNAPSHOT_ATOMIC_SNAPSHOT:
b694e52e JS	259	snapshot_deprecated_ioctl(cmd);
b694e52e JS	260	case SNAPSHOT_CREATE_IMAGE:
6e1819d6 RW	261	if (data->mode != O_RDONLY \|\| !data->frozen \|\| data->ready) {
	262	error = -EPERM;
	263	break;
	264	}
eb57c1cf	265	error = hibernation_snapshot(data->platform_support);
6e1819d6	266	if (!error)
cc5d207c	267	error = put_user(in_suspend, (int __user *)arg);
6e1819d6 RW	268	if (!error)
	269	data->ready = 1;
	270	break;
	271
	272	case SNAPSHOT_ATOMIC_RESTORE:
8357376d	273	snapshot_write_finalize(&data->handle);
6e1819d6 RW	274	if (data->mode != O_WRONLY \|\| !data->frozen \|\|
	275	!snapshot_image_loaded(&data->handle)) {
	276	error = -EPERM;
	277	break;
	278	}
eb57c1cf	279	error = hibernation_restore(data->platform_support);
6e1819d6 RW	280	break;
	281
	282	case SNAPSHOT_FREE:
	283	swsusp_free();
	284	memset(&data->handle, 0, sizeof(struct snapshot_handle));
	285	data->ready = 0;
	286	break;
	287
	288	case SNAPSHOT_SET_IMAGE_SIZE:
b694e52e JS	289	snapshot_deprecated_ioctl(cmd);
b694e52e JS	290	case SNAPSHOT_PREF_IMAGE_SIZE:
6e1819d6 RW	291	image_size = arg;
	292	break;
	293
af508b34 RW	294	case SNAPSHOT_GET_IMAGE_SIZE:
	295	if (!data->ready) {
	296	error = -ENODATA;
	297	break;
	298	}
	299	size = snapshot_get_image_size();
	300	size <<= PAGE_SHIFT;
	301	error = put_user(size, (loff_t __user *)arg);
	302	break;
	303
6e1819d6	304	case SNAPSHOT_AVAIL_SWAP:
b694e52e JS	305	snapshot_deprecated_ioctl(cmd);
b694e52e JS	306	case SNAPSHOT_AVAIL_SWAP_SIZE:
af508b34 RW	307	size = count_swap_pages(data->swap, 1);
	308	size <<= PAGE_SHIFT;
	309	error = put_user(size, (loff_t __user *)arg);
6e1819d6 RW	310	break;
	311
	312	case SNAPSHOT_GET_SWAP_PAGE:
b694e52e JS	313	snapshot_deprecated_ioctl(cmd);
b694e52e JS	314	case SNAPSHOT_ALLOC_SWAP_PAGE:
6e1819d6 RW	315	if (data->swap < 0 \|\| data->swap >= MAX_SWAPFILES) {
	316	error = -ENODEV;
	317	break;
	318	}
d1d241cc	319	offset = alloc_swapdev_block(data->swap);
6e1819d6 RW	320	if (offset) {
6e1819d6 RW	321	offset <<= PAGE_SHIFT;
cc5d207c	322	error = put_user(offset, (loff_t __user *)arg);
6e1819d6 RW	323	} else {
	324	error = -ENOSPC;
	325	}
	326	break;
	327
	328	case SNAPSHOT_FREE_SWAP_PAGES:
	329	if (data->swap < 0 \|\| data->swap >= MAX_SWAPFILES) {
	330	error = -ENODEV;
	331	break;
	332	}
d1d241cc	333	free_all_swap_pages(data->swap);
6e1819d6 RW	334	break;
6e1819d6 RW	335
96f73749	336	case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */
b694e52e	337	snapshot_deprecated_ioctl(cmd);
d1d241cc	338	if (!swsusp_swap_in_use()) {
6e1819d6 RW	339	/*
	340	* User space encodes device types as two-byte values,
	341	* so we need to recode them
	342	*/
	343	if (old_decode_dev(arg)) {
7bf23687 RW	344	data->swap = swap_type_of(old_decode_dev(arg),
7bf23687 RW	345	0, NULL);
6e1819d6 RW	346	if (data->swap < 0)
	347	error = -ENODEV;
	348	} else {
	349	data->swap = -1;
	350	error = -EINVAL;
	351	}
	352	} else {
	353	error = -EPERM;
	354	}
	355	break;
	356
9b238205 LT	357	case SNAPSHOT_S2RAM:
	358	if (!data->frozen) {
	359	error = -EPERM;
	360	break;
	361	}
6c961dfb RW	362	/*
	363	* Tasks are frozen and the notifiers have been called with
	364	* PM_HIBERNATION_PREPARE
	365	*/
	366	error = suspend_devices_and_enter(PM_SUSPEND_MEM);
9b238205 LT	367	break;
9b238205 LT	368
eb57c1cf RW	369	case SNAPSHOT_PLATFORM_SUPPORT:
	370	data->platform_support = !!arg;
	371	break;
	372
	373	case SNAPSHOT_POWER_OFF:
	374	if (data->platform_support)
	375	error = hibernation_platform_enter();
	376	break;
	377
	378	case SNAPSHOT_PMOPS: /* This ioctl is deprecated */
b694e52e	379	snapshot_deprecated_ioctl(cmd);
2b5b09b3 RW	380	error = -EINVAL;
2b5b09b3 RW	381
3592695c SS	382	switch (arg) {
	383
	384	case PMOPS_PREPARE:
eb57c1cf	385	data->platform_support = 1;
7777fab9	386	error = 0;
3592695c SS	387	break;
	388
	389	case PMOPS_ENTER:
eb57c1cf	390	if (data->platform_support)
7777fab9	391	error = hibernation_platform_enter();
3592695c SS	392	break;
	393
	394	case PMOPS_FINISH:
eb57c1cf	395	if (data->platform_support)
2b5b09b3	396	error = 0;
3592695c SS	397	break;
	398
	399	default:
	400	printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg);
3592695c SS	401
	402	}
	403	break;
	404
37b2ba12	405	case SNAPSHOT_SET_SWAP_AREA:
d1d241cc	406	if (swsusp_swap_in_use()) {
37b2ba12 RW	407	error = -EPERM;
	408	} else {
	409	struct resume_swap_area swap_area;
	410	dev_t swdev;
	411
	412	error = copy_from_user(&swap_area, (void __user *)arg,
	413	sizeof(struct resume_swap_area));
	414	if (error) {
	415	error = -EFAULT;
	416	break;
	417	}
	418
	419	/*
	420	* User space encodes device types as two-byte values,
	421	* so we need to recode them
	422	*/
d88d4050	423	swdev = new_decode_dev(swap_area.dev);
37b2ba12 RW	424	if (swdev) {
37b2ba12 RW	425	offset = swap_area.offset;
7bf23687	426	data->swap = swap_type_of(swdev, offset, NULL);
37b2ba12 RW	427	if (data->swap < 0)
	428	error = -ENODEV;
	429	} else {
	430	data->swap = -1;
	431	error = -EINVAL;
	432	}
	433	}
	434	break;
	435
6e1819d6 RW	436	default:
	437	error = -ENOTTY;
	438
	439	}
25f2f3da RW	440
	441	mutex_unlock(&pm_mutex);
	442
6e1819d6 RW	443	return error;
	444	}
	445
15ad7cdc	446	static const struct file_operations snapshot_fops = {
6e1819d6 RW	447	.open = snapshot_open,
	448	.release = snapshot_release,
	449	.read = snapshot_read,
	450	.write = snapshot_write,
	451	.llseek = no_llseek,
52d11025	452	.unlocked_ioctl = snapshot_ioctl,
6e1819d6 RW	453	};
	454
	455	static struct miscdevice snapshot_device = {
	456	.minor = SNAPSHOT_MINOR,
	457	.name = "snapshot",
	458	.fops = &snapshot_fops,
	459	};
	460
	461	static int __init snapshot_device_init(void)
	462	{
	463	return misc_register(&snapshot_device);
	464	};
	465
	466	device_initcall(snapshot_device_init);