#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>
+#include <linux/smp_lock.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;
- struct bitmap_page *bitmap;
int mode;
char frozen;
char ready;
+ char platform_support;
} snapshot_state;
-static atomic_t device_available = ATOMIC_INIT(1);
+atomic_t snapshot_device_available = ATOMIC_INIT(1);
static int snapshot_open(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
+ int error;
- if (!atomic_add_unless(&device_available, -1, 0))
- return -EBUSY;
+ mutex_lock(&pm_mutex);
- if ((filp->f_flags & O_ACCMODE) == O_RDWR)
- return -ENOSYS;
+ 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);
}
- data->bitmap = NULL;
+ if (error)
+ atomic_inc(&snapshot_device_available);
data->frozen = 0;
data->ready = 0;
+ data->platform_support = 0;
- return 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, data->bitmap);
- free_bitmap(data->bitmap);
- if (data->frozen) {
- mutex_lock(&pm_mutex);
+ free_all_swap_pages(data->swap);
+ if (data->frozen)
thaw_processes();
- enable_nonboot_cpus();
- mutex_unlock(&pm_mutex);
- }
- atomic_inc(&device_available);
+ 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;
}
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))
else
*offp = data->handle.offset;
}
+
+ Unlock:
+ mutex_unlock(&pm_mutex);
+
return res;
}
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) {
else
*offp = data->handle.offset;
}
- return res;
-}
-
-static int snapshot_suspend(void)
-{
- int error;
-
- mutex_lock(&pm_mutex);
- /* Free memory before shutting down devices. */
- error = swsusp_shrink_memory();
- if (error)
- goto Finish;
-
- suspend_console();
- error = device_suspend(PMSG_FREEZE);
- if (error)
- goto Resume_devices;
- error = disable_nonboot_cpus();
- if (!error) {
- in_suspend = 1;
- error = swsusp_suspend();
- }
- enable_nonboot_cpus();
- Resume_devices:
- device_resume();
- resume_console();
- Finish:
mutex_unlock(&pm_mutex);
- return error;
-}
-
-static int snapshot_restore(void)
-{
- int error;
- mutex_lock(&pm_mutex);
- pm_prepare_console();
- suspend_console();
- error = device_suspend(PMSG_PRETHAW);
- if (error)
- goto Resume_devices;
-
- error = disable_nonboot_cpus();
- if (!error)
- error = swsusp_resume();
-
- enable_nonboot_cpus();
- Resume_devices:
- device_resume();
- resume_console();
- pm_restore_console();
- mutex_unlock(&pm_mutex);
- return error;
+ return res;
}
-static int snapshot_ioctl(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
+static long snapshot_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
{
int error = 0;
struct snapshot_data *data;
- loff_t avail;
+ loff_t size;
sector_t offset;
if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
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;
- mutex_lock(&pm_mutex);
- if (freeze_processes()) {
+
+ printk("Syncing filesystems ... ");
+ sys_sync();
+ printk("done.\n");
+
+ error = usermodehelper_disable();
+ if (error)
+ break;
+
+ error = freeze_processes();
+ if (error) {
thaw_processes();
- error = -EBUSY;
+ usermodehelper_enable();
}
- mutex_unlock(&pm_mutex);
if (!error)
data->frozen = 1;
break;
case SNAPSHOT_UNFREEZE:
- if (!data->frozen)
+ if (!data->frozen || data->ready)
break;
- mutex_lock(&pm_mutex);
thaw_processes();
- mutex_unlock(&pm_mutex);
+ usermodehelper_enable();
data->frozen = 0;
break;
+ case SNAPSHOT_CREATE_IMAGE:
case SNAPSHOT_ATOMIC_SNAPSHOT:
if (data->mode != O_RDONLY || !data->frozen || data->ready) {
error = -EPERM;
break;
}
- error = snapshot_suspend();
+ error = hibernation_snapshot(data->platform_support);
if (!error)
- error = put_user(in_suspend, (unsigned int __user *)arg);
+ error = put_user(in_suspend, (int __user *)arg);
if (!error)
data->ready = 1;
break;
error = -EPERM;
break;
}
- error = snapshot_restore();
+ error = hibernation_restore(data->platform_support);
break;
case SNAPSHOT_FREE:
data->ready = 0;
break;
+ case SNAPSHOT_PREF_IMAGE_SIZE:
case SNAPSHOT_SET_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_SIZE:
case SNAPSHOT_AVAIL_SWAP:
- avail = count_swap_pages(data->swap, 1);
- avail <<= PAGE_SHIFT;
- error = put_user(avail, (loff_t __user *)arg);
+ size = count_swap_pages(data->swap, 1);
+ size <<= PAGE_SHIFT;
+ error = put_user(size, (loff_t __user *)arg);
break;
+ case SNAPSHOT_ALLOC_SWAP_PAGE:
case SNAPSHOT_GET_SWAP_PAGE:
if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
error = -ENODEV;
break;
}
- if (!data->bitmap) {
- data->bitmap = alloc_bitmap(count_swap_pages(data->swap, 0));
- if (!data->bitmap) {
- error = -ENOMEM;
- break;
- }
- }
- offset = alloc_swapdev_block(data->swap, data->bitmap);
+ offset = alloc_swapdev_block(data->swap);
if (offset) {
offset <<= PAGE_SHIFT;
- error = put_user(offset, (sector_t __user *)arg);
+ error = put_user(offset, (loff_t __user *)arg);
} else {
error = -ENOSPC;
}
error = -ENODEV;
break;
}
- free_all_swap_pages(data->swap, data->bitmap);
- free_bitmap(data->bitmap);
- data->bitmap = NULL;
+ free_all_swap_pages(data->swap);
break;
- case SNAPSHOT_SET_SWAP_FILE:
- if (!data->bitmap) {
+ case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */
+ if (!swsusp_swap_in_use()) {
/*
* User space encodes device types as two-byte values,
* so we need to recode them
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;
- if (!mutex_trylock(&pm_mutex)) {
- error = -EBUSY;
- break;
- }
-
- if (pm_ops->prepare) {
- error = pm_ops->prepare(PM_SUSPEND_MEM);
- if (error)
- goto OutS3;
- }
-
- /* Put devices to sleep */
- suspend_console();
- error = device_suspend(PMSG_SUSPEND);
- if (error) {
- printk(KERN_ERR "Failed to suspend some devices.\n");
- } else {
- /* Enter S3, system is already frozen */
- suspend_enter(PM_SUSPEND_MEM);
-
- /* Wake up devices */
- device_resume();
- }
- resume_console();
- if (pm_ops->finish)
- pm_ops->finish(PM_SUSPEND_MEM);
+ case SNAPSHOT_PLATFORM_SUPPORT:
+ data->platform_support = !!arg;
+ break;
- OutS3:
- mutex_unlock(&pm_mutex);
+ case SNAPSHOT_POWER_OFF:
+ if (data->platform_support)
+ error = hibernation_platform_enter();
break;
- case SNAPSHOT_PMOPS:
+ case SNAPSHOT_PMOPS: /* This ioctl is deprecated */
+ error = -EINVAL;
+
switch (arg) {
case PMOPS_PREPARE:
- if (pm_ops->prepare) {
- error = pm_ops->prepare(PM_SUSPEND_DISK);
- }
+ data->platform_support = 1;
+ error = 0;
break;
case PMOPS_ENTER:
- kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
- error = pm_ops->enter(PM_SUSPEND_DISK);
+ if (data->platform_support)
+ error = hibernation_platform_enter();
break;
case PMOPS_FINISH:
- if (pm_ops && pm_ops->finish) {
- pm_ops->finish(PM_SUSPEND_DISK);
- }
+ if (data->platform_support)
+ error = 0;
break;
default:
printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg);
- error = -EINVAL;
}
break;
case SNAPSHOT_SET_SWAP_AREA:
- if (data->bitmap) {
+ if (swsusp_swap_in_use()) {
error = -EPERM;
} else {
struct resume_swap_area swap_area;
}
+ mutex_unlock(&pm_mutex);
+
return error;
}
.read = snapshot_read,
.write = snapshot_write,
.llseek = no_llseek,
- .ioctl = snapshot_ioctl,
+ .unlocked_ioctl = snapshot_ioctl,
};
static struct miscdevice snapshot_device = {
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff