[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/kmod.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)
			usermodehelper_enable();
		else
			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 && !freezer_test_done)
				data->ready = 1;
			if (freezer_test_done) {
				freezer_test_done = false;
				thaw_processes();
			}
		}
		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>
74da1ff7	15	#include <linux/kmod.h>
6e1819d6 RW	16	#include <linux/string.h>
	17	#include <linux/device.h>
	18	#include <linux/miscdevice.h>
	19	#include <linux/mm.h>
	20	#include <linux/swap.h>
	21	#include <linux/swapops.h>
	22	#include <linux/pm.h>
	23	#include <linux/fs.h>
97c7801c	24	#include <linux/console.h>
e3920fb4	25	#include <linux/cpu.h>
7dfb7103	26	#include <linux/freezer.h>
c7510859	27	#include <scsi/scsi_scan.h>
6e1819d6 RW	28
	29	#include <asm/uaccess.h>
	30
	31	#include "power.h"
	32
eb57c1cf	33	/*
96f73749 RW	34	* NOTE: The SNAPSHOT_SET_SWAP_FILE and SNAPSHOT_PMOPS ioctls are obsolete and
	35	* will be removed in the future. They are only preserved here for
	36	* compatibility with existing userland utilities.
eb57c1cf	37	*/
96f73749	38	#define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
eb57c1cf RW	39	#define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
	40
	41	#define PMOPS_PREPARE 1
	42	#define PMOPS_ENTER 2
	43	#define PMOPS_FINISH 3
	44
cc5d207c RW	45	/*
	46	* NOTE: The following ioctl definitions are wrong and have been replaced with
	47	* correct ones. They are only preserved here for compatibility with existing
	48	* userland utilities and will be removed in the future.
	49	*/
	50	#define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
	51	#define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
	52	#define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
	53	#define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
	54
eb57c1cf	55
6e1819d6 RW	56	#define SNAPSHOT_MINOR 231
	57
	58	static struct snapshot_data {
	59	struct snapshot_handle handle;
	60	int swap;
6e1819d6 RW	61	int mode;
	62	char frozen;
	63	char ready;
eb57c1cf	64	char platform_support;
6e1819d6 RW	65	} snapshot_state;
6e1819d6 RW	66
0709db60	67	atomic_t snapshot_device_available = ATOMIC_INIT(1);
6e1819d6 RW	68
	69	static int snapshot_open(struct inode inode, struct file filp)
	70	{
	71	struct snapshot_data *data;
c3e94d89	72	int error;
6e1819d6	73
25f2f3da RW	74	mutex_lock(&pm_mutex);
	75
	76	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
	77	error = -EBUSY;
	78	goto Unlock;
	79	}
6e1819d6	80
1525a2ad	81	if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
0709db60	82	atomic_inc(&snapshot_device_available);
25f2f3da RW	83	error = -ENOSYS;
25f2f3da RW	84	goto Unlock;
1525a2ad RW	85	}
1525a2ad RW	86	if(create_basic_memory_bitmaps()) {
0709db60	87	atomic_inc(&snapshot_device_available);
25f2f3da RW	88	error = -ENOMEM;
25f2f3da RW	89	goto Unlock;
1525a2ad	90	}
6e1819d6 RW	91	nonseekable_open(inode, filp);
	92	data = &snapshot_state;
	93	filp->private_data = data;
	94	memset(&data->handle, 0, sizeof(struct snapshot_handle));
	95	if ((filp->f_flags & O_ACCMODE) == O_RDONLY) {
c7510859	96	/* Hibernating. The image device should be accessible. */
915bae9e	97	data->swap = swsusp_resume_device ?
7bf23687	98	swap_type_of(swsusp_resume_device, 0, NULL) : -1;
6e1819d6	99	data->mode = O_RDONLY;
ebae2604	100	error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
c3e94d89	101	if (error)
ebae2604	102	pm_notifier_call_chain(PM_POST_HIBERNATION);
6e1819d6	103	} else {
c7510859 RW	104	/*
	105	* Resuming. We may need to wait for the image device to
	106	* appear.
	107	*/
	108	wait_for_device_probe();
	109	scsi_complete_async_scans();
	110
6e1819d6 RW	111	data->swap = -1;
6e1819d6 RW	112	data->mode = O_WRONLY;
ebae2604	113	error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
c3e94d89	114	if (error)
ebae2604	115	pm_notifier_call_chain(PM_POST_RESTORE);
c3e94d89	116	}
8440f4b1 MK	117	if (error) {
8440f4b1 MK	118	free_basic_memory_bitmaps();
c3e94d89	119	atomic_inc(&snapshot_device_available);
8440f4b1	120	}
6e1819d6 RW	121	data->frozen = 0;
6e1819d6 RW	122	data->ready = 0;
eb57c1cf	123	data->platform_support = 0;
6e1819d6	124
25f2f3da RW	125	Unlock:
	126	mutex_unlock(&pm_mutex);
	127
	128	return error;
6e1819d6 RW	129	}
	130
	131	static int snapshot_release(struct inode inode, struct file filp)
	132	{
	133	struct snapshot_data *data;
	134
25f2f3da RW	135	mutex_lock(&pm_mutex);
25f2f3da RW	136
6e1819d6	137	swsusp_free();
74dfd666	138	free_basic_memory_bitmaps();
6e1819d6	139	data = filp->private_data;
d1d241cc	140	free_all_swap_pages(data->swap);
9744997a RW	141	if (data->frozen) {
9744997a RW	142	pm_restore_gfp_mask();
6e1819d6	143	thaw_processes();
9744997a	144	}
1497dd1d	145	pm_notifier_call_chain(data->mode == O_RDONLY ?
c3e94d89	146	PM_POST_HIBERNATION : PM_POST_RESTORE);
0709db60	147	atomic_inc(&snapshot_device_available);
25f2f3da RW	148
	149	mutex_unlock(&pm_mutex);
	150
6e1819d6 RW	151	return 0;
	152	}
	153
	154	static ssize_t snapshot_read(struct file filp, char __user buf,
	155	size_t count, loff_t *offp)
	156	{
	157	struct snapshot_data *data;
	158	ssize_t res;
d3c1b24c	159	loff_t pg_offp = *offp & ~PAGE_MASK;
6e1819d6	160
25f2f3da RW	161	mutex_lock(&pm_mutex);
25f2f3da RW	162
6e1819d6	163	data = filp->private_data;
25f2f3da RW	164	if (!data->ready) {
	165	res = -ENODATA;
	166	goto Unlock;
	167	}
d3c1b24c JS	168	if (!pg_offp) { /* on page boundary? */
	169	res = snapshot_read_next(&data->handle);
	170	if (res <= 0)
	171	goto Unlock;
	172	} else {
	173	res = PAGE_SIZE - pg_offp;
6e1819d6	174	}
25f2f3da	175
d3c1b24c JS	176	res = simple_read_from_buffer(buf, count, &pg_offp,
	177	data_of(data->handle), res);
	178	if (res > 0)
	179	*offp += res;
	180
25f2f3da RW	181	Unlock:
	182	mutex_unlock(&pm_mutex);
	183
6e1819d6 RW	184	return res;
	185	}
	186
	187	static ssize_t snapshot_write(struct file filp, const char __user buf,
	188	size_t count, loff_t *offp)
	189	{
	190	struct snapshot_data *data;
	191	ssize_t res;
d3c1b24c	192	loff_t pg_offp = *offp & ~PAGE_MASK;
6e1819d6	193
25f2f3da RW	194	mutex_lock(&pm_mutex);
25f2f3da RW	195
6e1819d6	196	data = filp->private_data;
d3c1b24c JS	197
	198	if (!pg_offp) {
	199	res = snapshot_write_next(&data->handle);
	200	if (res <= 0)
	201	goto unlock;
	202	} else {
	203	res = PAGE_SIZE - pg_offp;
6e1819d6	204	}
25f2f3da	205
d3c1b24c JS	206	res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,
	207	buf, count);
	208	if (res > 0)
	209	*offp += res;
	210	unlock:
25f2f3da RW	211	mutex_unlock(&pm_mutex);
25f2f3da RW	212
6e1819d6 RW	213	return res;
	214	}
	215
b694e52e JS	216	static void snapshot_deprecated_ioctl(unsigned int cmd)
	217	{
	218	if (printk_ratelimit())
	219	printk(KERN_NOTICE "%pf: ioctl '%.8x' is deprecated and will "
	220	"be removed soon, update your suspend-to-disk "
	221	"utilities\n",
	222	__builtin_return_address(0), cmd);
	223	}
	224
52d11025 AC	225	static long snapshot_ioctl(struct file *filp, unsigned int cmd,
52d11025 AC	226	unsigned long arg)
6e1819d6 RW	227	{
	228	int error = 0;
	229	struct snapshot_data *data;
af508b34	230	loff_t size;
3aef83e0	231	sector_t offset;
6e1819d6 RW	232
	233	if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
	234	return -ENOTTY;
	235	if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR)
	236	return -ENOTTY;
	237	if (!capable(CAP_SYS_ADMIN))
	238	return -EPERM;
	239
25f2f3da RW	240	if (!mutex_trylock(&pm_mutex))
25f2f3da RW	241	return -EBUSY;
6e1819d6	242
25f2f3da	243	data = filp->private_data;
52d11025	244
6e1819d6 RW	245	switch (cmd) {
	246
	247	case SNAPSHOT_FREEZE:
	248	if (data->frozen)
	249	break;
1bfcf130	250
c3e94d89 AS	251	printk("Syncing filesystems ... ");
	252	sys_sync();
	253	printk("done.\n");
	254
1bfcf130	255	error = usermodehelper_disable();
b10d9117	256	if (error)
1bfcf130 RW	257	break;
	258
	259	error = freeze_processes();
03afed8b	260	if (error)
1bfcf130	261	usermodehelper_enable();
e5b16746	262	else
6e1819d6 RW	263	data->frozen = 1;
	264	break;
	265
	266	case SNAPSHOT_UNFREEZE:
2f41dddb	267	if (!data->frozen \|\| data->ready)
6e1819d6	268	break;
c9e664f1	269	pm_restore_gfp_mask();
6e1819d6	270	thaw_processes();
1bfcf130	271	usermodehelper_enable();
6e1819d6 RW	272	data->frozen = 0;
	273	break;
	274
	275	case SNAPSHOT_ATOMIC_SNAPSHOT:
b694e52e JS	276	snapshot_deprecated_ioctl(cmd);
b694e52e JS	277	case SNAPSHOT_CREATE_IMAGE:
6e1819d6 RW	278	if (data->mode != O_RDONLY \|\| !data->frozen \|\| data->ready) {
	279	error = -EPERM;
	280	break;
	281	}
c9e664f1	282	pm_restore_gfp_mask();
eb57c1cf	283	error = hibernation_snapshot(data->platform_support);
97819a26	284	if (!error) {
cc5d207c	285	error = put_user(in_suspend, (int __user *)arg);
97819a26 SB	286	if (!error && !freezer_test_done)
	287	data->ready = 1;
	288	if (freezer_test_done) {
	289	freezer_test_done = false;
	290	thaw_processes();
	291	}
	292	}
6e1819d6 RW	293	break;
	294
	295	case SNAPSHOT_ATOMIC_RESTORE:
8357376d	296	snapshot_write_finalize(&data->handle);
6e1819d6 RW	297	if (data->mode != O_WRONLY \|\| !data->frozen \|\|
	298	!snapshot_image_loaded(&data->handle)) {
	299	error = -EPERM;
	300	break;
	301	}
eb57c1cf	302	error = hibernation_restore(data->platform_support);
6e1819d6 RW	303	break;
	304
	305	case SNAPSHOT_FREE:
	306	swsusp_free();
	307	memset(&data->handle, 0, sizeof(struct snapshot_handle));
	308	data->ready = 0;
	309	break;
	310
	311	case SNAPSHOT_SET_IMAGE_SIZE:
b694e52e JS	312	snapshot_deprecated_ioctl(cmd);
b694e52e JS	313	case SNAPSHOT_PREF_IMAGE_SIZE:
6e1819d6 RW	314	image_size = arg;
	315	break;
	316
af508b34 RW	317	case SNAPSHOT_GET_IMAGE_SIZE:
	318	if (!data->ready) {
	319	error = -ENODATA;
	320	break;
	321	}
	322	size = snapshot_get_image_size();
	323	size <<= PAGE_SHIFT;
	324	error = put_user(size, (loff_t __user *)arg);
	325	break;
	326
6e1819d6	327	case SNAPSHOT_AVAIL_SWAP:
b694e52e JS	328	snapshot_deprecated_ioctl(cmd);
b694e52e JS	329	case SNAPSHOT_AVAIL_SWAP_SIZE:
af508b34 RW	330	size = count_swap_pages(data->swap, 1);
	331	size <<= PAGE_SHIFT;
	332	error = put_user(size, (loff_t __user *)arg);
6e1819d6 RW	333	break;
	334
	335	case SNAPSHOT_GET_SWAP_PAGE:
b694e52e JS	336	snapshot_deprecated_ioctl(cmd);
b694e52e JS	337	case SNAPSHOT_ALLOC_SWAP_PAGE:
6e1819d6 RW	338	if (data->swap < 0 \|\| data->swap >= MAX_SWAPFILES) {
	339	error = -ENODEV;
	340	break;
	341	}
d1d241cc	342	offset = alloc_swapdev_block(data->swap);
6e1819d6 RW	343	if (offset) {
6e1819d6 RW	344	offset <<= PAGE_SHIFT;
cc5d207c	345	error = put_user(offset, (loff_t __user *)arg);
6e1819d6 RW	346	} else {
	347	error = -ENOSPC;
	348	}
	349	break;
	350
	351	case SNAPSHOT_FREE_SWAP_PAGES:
	352	if (data->swap < 0 \|\| data->swap >= MAX_SWAPFILES) {
	353	error = -ENODEV;
	354	break;
	355	}
d1d241cc	356	free_all_swap_pages(data->swap);
6e1819d6 RW	357	break;
6e1819d6 RW	358
96f73749	359	case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */
b694e52e	360	snapshot_deprecated_ioctl(cmd);
d1d241cc	361	if (!swsusp_swap_in_use()) {
6e1819d6 RW	362	/*
	363	* User space encodes device types as two-byte values,
	364	* so we need to recode them
	365	*/
	366	if (old_decode_dev(arg)) {
7bf23687 RW	367	data->swap = swap_type_of(old_decode_dev(arg),
7bf23687 RW	368	0, NULL);
6e1819d6 RW	369	if (data->swap < 0)
	370	error = -ENODEV;
	371	} else {
	372	data->swap = -1;
	373	error = -EINVAL;
	374	}
	375	} else {
	376	error = -EPERM;
	377	}
	378	break;
	379
9b238205 LT	380	case SNAPSHOT_S2RAM:
	381	if (!data->frozen) {
	382	error = -EPERM;
	383	break;
	384	}
6c961dfb RW	385	/*
	386	* Tasks are frozen and the notifiers have been called with
	387	* PM_HIBERNATION_PREPARE
	388	*/
	389	error = suspend_devices_and_enter(PM_SUSPEND_MEM);
36cb7035	390	data->ready = 0;
9b238205 LT	391	break;
9b238205 LT	392
eb57c1cf RW	393	case SNAPSHOT_PLATFORM_SUPPORT:
	394	data->platform_support = !!arg;
	395	break;
	396
	397	case SNAPSHOT_POWER_OFF:
	398	if (data->platform_support)
	399	error = hibernation_platform_enter();
	400	break;
	401
	402	case SNAPSHOT_PMOPS: /* This ioctl is deprecated */
b694e52e	403	snapshot_deprecated_ioctl(cmd);
2b5b09b3 RW	404	error = -EINVAL;
2b5b09b3 RW	405
3592695c SS	406	switch (arg) {
	407
	408	case PMOPS_PREPARE:
eb57c1cf	409	data->platform_support = 1;
7777fab9	410	error = 0;
3592695c SS	411	break;
	412
	413	case PMOPS_ENTER:
eb57c1cf	414	if (data->platform_support)
7777fab9	415	error = hibernation_platform_enter();
3592695c SS	416	break;
	417
	418	case PMOPS_FINISH:
eb57c1cf	419	if (data->platform_support)
2b5b09b3	420	error = 0;
3592695c SS	421	break;
	422
	423	default:
	424	printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg);
3592695c SS	425
	426	}
	427	break;
	428
37b2ba12	429	case SNAPSHOT_SET_SWAP_AREA:
d1d241cc	430	if (swsusp_swap_in_use()) {
37b2ba12 RW	431	error = -EPERM;
	432	} else {
	433	struct resume_swap_area swap_area;
	434	dev_t swdev;
	435
	436	error = copy_from_user(&swap_area, (void __user *)arg,
	437	sizeof(struct resume_swap_area));
	438	if (error) {
	439	error = -EFAULT;
	440	break;
	441	}
	442
	443	/*
	444	* User space encodes device types as two-byte values,
	445	* so we need to recode them
	446	*/
d88d4050	447	swdev = new_decode_dev(swap_area.dev);
37b2ba12 RW	448	if (swdev) {
37b2ba12 RW	449	offset = swap_area.offset;
7bf23687	450	data->swap = swap_type_of(swdev, offset, NULL);
37b2ba12 RW	451	if (data->swap < 0)
	452	error = -ENODEV;
	453	} else {
	454	data->swap = -1;
	455	error = -EINVAL;
	456	}
	457	}
	458	break;
	459
6e1819d6 RW	460	default:
	461	error = -ENOTTY;
	462
	463	}
25f2f3da RW	464
	465	mutex_unlock(&pm_mutex);
	466
6e1819d6 RW	467	return error;
	468	}
	469
15ad7cdc	470	static const struct file_operations snapshot_fops = {
6e1819d6 RW	471	.open = snapshot_open,
	472	.release = snapshot_release,
	473	.read = snapshot_read,
	474	.write = snapshot_write,
	475	.llseek = no_llseek,
52d11025	476	.unlocked_ioctl = snapshot_ioctl,
6e1819d6 RW	477	};
	478
	479	static struct miscdevice snapshot_device = {
	480	.minor = SNAPSHOT_MINOR,
	481	.name = "snapshot",
	482	.fops = &snapshot_fops,
	483	};
	484
	485	static int __init snapshot_device_init(void)
	486	{
	487	return misc_register(&snapshot_device);
	488	};
	489
	490	device_initcall(snapshot_device_init);