[deliverable/linux.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) {
		free_basic_memory_bitmaps();
		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) {
		pm_restore_gfp_mask();
		thaw_processes();
	}
	pm_notifier_call_chain(data->mode == O_RDONLY ?
			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;
		pm_restore_gfp_mask();
		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;
		}
		pm_restore_gfp_mask();
		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);
		data->ready = 0;
		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	}
8440f4b1 MK	116	if (error) {
8440f4b1 MK	117	free_basic_memory_bitmaps();
c3e94d89	118	atomic_inc(&snapshot_device_available);
8440f4b1	119	}
6e1819d6 RW	120	data->frozen = 0;
6e1819d6 RW	121	data->ready = 0;
eb57c1cf	122	data->platform_support = 0;
6e1819d6	123
25f2f3da RW	124	Unlock:
	125	mutex_unlock(&pm_mutex);
	126
	127	return error;
6e1819d6 RW	128	}
	129
	130	static int snapshot_release(struct inode inode, struct file filp)
	131	{
	132	struct snapshot_data *data;
	133
25f2f3da RW	134	mutex_lock(&pm_mutex);
25f2f3da RW	135
6e1819d6	136	swsusp_free();
74dfd666	137	free_basic_memory_bitmaps();
6e1819d6	138	data = filp->private_data;
d1d241cc	139	free_all_swap_pages(data->swap);
9744997a RW	140	if (data->frozen) {
9744997a RW	141	pm_restore_gfp_mask();
6e1819d6	142	thaw_processes();
9744997a	143	}
1497dd1d	144	pm_notifier_call_chain(data->mode == O_RDONLY ?
c3e94d89	145	PM_POST_HIBERNATION : PM_POST_RESTORE);
0709db60	146	atomic_inc(&snapshot_device_available);
25f2f3da RW	147
	148	mutex_unlock(&pm_mutex);
	149
6e1819d6 RW	150	return 0;
	151	}
	152
	153	static ssize_t snapshot_read(struct file filp, char __user buf,
	154	size_t count, loff_t *offp)
	155	{
	156	struct snapshot_data *data;
	157	ssize_t res;
d3c1b24c	158	loff_t pg_offp = *offp & ~PAGE_MASK;
6e1819d6	159
25f2f3da RW	160	mutex_lock(&pm_mutex);
25f2f3da RW	161
6e1819d6	162	data = filp->private_data;
25f2f3da RW	163	if (!data->ready) {
	164	res = -ENODATA;
	165	goto Unlock;
	166	}
d3c1b24c JS	167	if (!pg_offp) { /* on page boundary? */
	168	res = snapshot_read_next(&data->handle);
	169	if (res <= 0)
	170	goto Unlock;
	171	} else {
	172	res = PAGE_SIZE - pg_offp;
6e1819d6	173	}
25f2f3da	174
d3c1b24c JS	175	res = simple_read_from_buffer(buf, count, &pg_offp,
	176	data_of(data->handle), res);
	177	if (res > 0)
	178	*offp += res;
	179
25f2f3da RW	180	Unlock:
	181	mutex_unlock(&pm_mutex);
	182
6e1819d6 RW	183	return res;
	184	}
	185
	186	static ssize_t snapshot_write(struct file filp, const char __user buf,
	187	size_t count, loff_t *offp)
	188	{
	189	struct snapshot_data *data;
	190	ssize_t res;
d3c1b24c	191	loff_t pg_offp = *offp & ~PAGE_MASK;
6e1819d6	192
25f2f3da RW	193	mutex_lock(&pm_mutex);
25f2f3da RW	194
6e1819d6	195	data = filp->private_data;
d3c1b24c JS	196
	197	if (!pg_offp) {
	198	res = snapshot_write_next(&data->handle);
	199	if (res <= 0)
	200	goto unlock;
	201	} else {
	202	res = PAGE_SIZE - pg_offp;
6e1819d6	203	}
25f2f3da	204
d3c1b24c JS	205	res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,
	206	buf, count);
	207	if (res > 0)
	208	*offp += res;
	209	unlock:
25f2f3da RW	210	mutex_unlock(&pm_mutex);
25f2f3da RW	211
6e1819d6 RW	212	return res;
	213	}
	214
b694e52e JS	215	static void snapshot_deprecated_ioctl(unsigned int cmd)
	216	{
	217	if (printk_ratelimit())
	218	printk(KERN_NOTICE "%pf: ioctl '%.8x' is deprecated and will "
	219	"be removed soon, update your suspend-to-disk "
	220	"utilities\n",
	221	__builtin_return_address(0), cmd);
	222	}
	223
52d11025 AC	224	static long snapshot_ioctl(struct file *filp, unsigned int cmd,
52d11025 AC	225	unsigned long arg)
6e1819d6 RW	226	{
	227	int error = 0;
	228	struct snapshot_data *data;
af508b34	229	loff_t size;
3aef83e0	230	sector_t offset;
6e1819d6 RW	231
	232	if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
	233	return -ENOTTY;
	234	if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR)
	235	return -ENOTTY;
	236	if (!capable(CAP_SYS_ADMIN))
	237	return -EPERM;
	238
25f2f3da RW	239	if (!mutex_trylock(&pm_mutex))
25f2f3da RW	240	return -EBUSY;
6e1819d6	241
25f2f3da	242	data = filp->private_data;
52d11025	243
6e1819d6 RW	244	switch (cmd) {
	245
	246	case SNAPSHOT_FREEZE:
	247	if (data->frozen)
	248	break;
1bfcf130	249
c3e94d89 AS	250	printk("Syncing filesystems ... ");
	251	sys_sync();
	252	printk("done.\n");
	253
1bfcf130	254	error = usermodehelper_disable();
b10d9117	255	if (error)
1bfcf130 RW	256	break;
	257
	258	error = freeze_processes();
	259	if (error) {
c3e94d89	260	thaw_processes();
1bfcf130 RW	261	usermodehelper_enable();
1bfcf130 RW	262	}
6e1819d6 RW	263	if (!error)
	264	data->frozen = 1;
	265	break;
	266
	267	case SNAPSHOT_UNFREEZE:
2f41dddb	268	if (!data->frozen \|\| data->ready)
6e1819d6	269	break;
c9e664f1	270	pm_restore_gfp_mask();
6e1819d6	271	thaw_processes();
1bfcf130	272	usermodehelper_enable();
6e1819d6 RW	273	data->frozen = 0;
	274	break;
	275
	276	case SNAPSHOT_ATOMIC_SNAPSHOT:
b694e52e JS	277	snapshot_deprecated_ioctl(cmd);
b694e52e JS	278	case SNAPSHOT_CREATE_IMAGE:
6e1819d6 RW	279	if (data->mode != O_RDONLY \|\| !data->frozen \|\| data->ready) {
	280	error = -EPERM;
	281	break;
	282	}
c9e664f1	283	pm_restore_gfp_mask();
eb57c1cf	284	error = hibernation_snapshot(data->platform_support);
6e1819d6	285	if (!error)
cc5d207c	286	error = put_user(in_suspend, (int __user *)arg);
6e1819d6 RW	287	if (!error)
	288	data->ready = 1;
	289	break;
	290
	291	case SNAPSHOT_ATOMIC_RESTORE:
8357376d	292	snapshot_write_finalize(&data->handle);
6e1819d6 RW	293	if (data->mode != O_WRONLY \|\| !data->frozen \|\|
	294	!snapshot_image_loaded(&data->handle)) {
	295	error = -EPERM;
	296	break;
	297	}
eb57c1cf	298	error = hibernation_restore(data->platform_support);
6e1819d6 RW	299	break;
	300
	301	case SNAPSHOT_FREE:
	302	swsusp_free();
	303	memset(&data->handle, 0, sizeof(struct snapshot_handle));
	304	data->ready = 0;
	305	break;
	306
	307	case SNAPSHOT_SET_IMAGE_SIZE:
b694e52e JS	308	snapshot_deprecated_ioctl(cmd);
b694e52e JS	309	case SNAPSHOT_PREF_IMAGE_SIZE:
6e1819d6 RW	310	image_size = arg;
	311	break;
	312
af508b34 RW	313	case SNAPSHOT_GET_IMAGE_SIZE:
	314	if (!data->ready) {
	315	error = -ENODATA;
	316	break;
	317	}
	318	size = snapshot_get_image_size();
	319	size <<= PAGE_SHIFT;
	320	error = put_user(size, (loff_t __user *)arg);
	321	break;
	322
6e1819d6	323	case SNAPSHOT_AVAIL_SWAP:
b694e52e JS	324	snapshot_deprecated_ioctl(cmd);
b694e52e JS	325	case SNAPSHOT_AVAIL_SWAP_SIZE:
af508b34 RW	326	size = count_swap_pages(data->swap, 1);
	327	size <<= PAGE_SHIFT;
	328	error = put_user(size, (loff_t __user *)arg);
6e1819d6 RW	329	break;
	330
	331	case SNAPSHOT_GET_SWAP_PAGE:
b694e52e JS	332	snapshot_deprecated_ioctl(cmd);
b694e52e JS	333	case SNAPSHOT_ALLOC_SWAP_PAGE:
6e1819d6 RW	334	if (data->swap < 0 \|\| data->swap >= MAX_SWAPFILES) {
	335	error = -ENODEV;
	336	break;
	337	}
d1d241cc	338	offset = alloc_swapdev_block(data->swap);
6e1819d6 RW	339	if (offset) {
6e1819d6 RW	340	offset <<= PAGE_SHIFT;
cc5d207c	341	error = put_user(offset, (loff_t __user *)arg);
6e1819d6 RW	342	} else {
	343	error = -ENOSPC;
	344	}
	345	break;
	346
	347	case SNAPSHOT_FREE_SWAP_PAGES:
	348	if (data->swap < 0 \|\| data->swap >= MAX_SWAPFILES) {
	349	error = -ENODEV;
	350	break;
	351	}
d1d241cc	352	free_all_swap_pages(data->swap);
6e1819d6 RW	353	break;
6e1819d6 RW	354
96f73749	355	case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */
b694e52e	356	snapshot_deprecated_ioctl(cmd);
d1d241cc	357	if (!swsusp_swap_in_use()) {
6e1819d6 RW	358	/*
	359	* User space encodes device types as two-byte values,
	360	* so we need to recode them
	361	*/
	362	if (old_decode_dev(arg)) {
7bf23687 RW	363	data->swap = swap_type_of(old_decode_dev(arg),
7bf23687 RW	364	0, NULL);
6e1819d6 RW	365	if (data->swap < 0)
	366	error = -ENODEV;
	367	} else {
	368	data->swap = -1;
	369	error = -EINVAL;
	370	}
	371	} else {
	372	error = -EPERM;
	373	}
	374	break;
	375
9b238205 LT	376	case SNAPSHOT_S2RAM:
	377	if (!data->frozen) {
	378	error = -EPERM;
	379	break;
	380	}
6c961dfb RW	381	/*
	382	* Tasks are frozen and the notifiers have been called with
	383	* PM_HIBERNATION_PREPARE
	384	*/
	385	error = suspend_devices_and_enter(PM_SUSPEND_MEM);
36cb7035	386	data->ready = 0;
9b238205 LT	387	break;
9b238205 LT	388
eb57c1cf RW	389	case SNAPSHOT_PLATFORM_SUPPORT:
	390	data->platform_support = !!arg;
	391	break;
	392
	393	case SNAPSHOT_POWER_OFF:
	394	if (data->platform_support)
	395	error = hibernation_platform_enter();
	396	break;
	397
	398	case SNAPSHOT_PMOPS: /* This ioctl is deprecated */
b694e52e	399	snapshot_deprecated_ioctl(cmd);
2b5b09b3 RW	400	error = -EINVAL;
2b5b09b3 RW	401
3592695c SS	402	switch (arg) {
	403
	404	case PMOPS_PREPARE:
eb57c1cf	405	data->platform_support = 1;
7777fab9	406	error = 0;
3592695c SS	407	break;
	408
	409	case PMOPS_ENTER:
eb57c1cf	410	if (data->platform_support)
7777fab9	411	error = hibernation_platform_enter();
3592695c SS	412	break;
	413
	414	case PMOPS_FINISH:
eb57c1cf	415	if (data->platform_support)
2b5b09b3	416	error = 0;
3592695c SS	417	break;
	418
	419	default:
	420	printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg);
3592695c SS	421
	422	}
	423	break;
	424
37b2ba12	425	case SNAPSHOT_SET_SWAP_AREA:
d1d241cc	426	if (swsusp_swap_in_use()) {
37b2ba12 RW	427	error = -EPERM;
	428	} else {
	429	struct resume_swap_area swap_area;
	430	dev_t swdev;
	431
	432	error = copy_from_user(&swap_area, (void __user *)arg,
	433	sizeof(struct resume_swap_area));
	434	if (error) {
	435	error = -EFAULT;
	436	break;
	437	}
	438
	439	/*
	440	* User space encodes device types as two-byte values,
	441	* so we need to recode them
	442	*/
d88d4050	443	swdev = new_decode_dev(swap_area.dev);
37b2ba12 RW	444	if (swdev) {
37b2ba12 RW	445	offset = swap_area.offset;
7bf23687	446	data->swap = swap_type_of(swdev, offset, NULL);
37b2ba12 RW	447	if (data->swap < 0)
	448	error = -ENODEV;
	449	} else {
	450	data->swap = -1;
	451	error = -EINVAL;
	452	}
	453	}
	454	break;
	455
6e1819d6 RW	456	default:
	457	error = -ENOTTY;
	458
	459	}
25f2f3da RW	460
	461	mutex_unlock(&pm_mutex);
	462
6e1819d6 RW	463	return error;
	464	}
	465
15ad7cdc	466	static const struct file_operations snapshot_fops = {
6e1819d6 RW	467	.open = snapshot_open,
	468	.release = snapshot_release,
	469	.read = snapshot_read,
	470	.write = snapshot_write,
	471	.llseek = no_llseek,
52d11025	472	.unlocked_ioctl = snapshot_ioctl,
6e1819d6 RW	473	};
	474
	475	static struct miscdevice snapshot_device = {
	476	.minor = SNAPSHOT_MINOR,
	477	.name = "snapshot",
	478	.fops = &snapshot_fops,
	479	};
	480
	481	static int __init snapshot_device_init(void)
	482	{
	483	return misc_register(&snapshot_device);
	484	};
	485
	486	device_initcall(snapshot_device_init);