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