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_CREATE_IMAGE: case SNAPSHOT_ATOMIC_SNAPSHOT: 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_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: 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; } 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 */ 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 */ 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 = old_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 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_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; /* * It is necessary to thaw kernel threads here, because * SNAPSHOT_CREATE_IMAGE may be invoked directly after * SNAPSHOT_FREE. In that case, if kernel threads were not * thawed, the preallocation of memory carried out by * hibernation_snapshot() might run into problems (i.e. it * might fail or even deadlock). */ thaw_kernel_threads(); break; 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_SIZE: size = count_swap_pages(data->swap, 1); size <<= PAGE_SHIFT; error = put_user(size, (loff_t __user *)arg); break; 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_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_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 int snapshot_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { int error = 0; struct snapshot_data *data; loff_t avail; 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; data = filp->private_data; switch (cmd) { case SNAPSHOT_FREEZE: if (data->frozen) break; mutex_lock(&pm_mutex); if (freeze_processes()) { thaw_processes(); error = -EBUSY; } mutex_unlock(&pm_mutex); if (!error) data->frozen = 1; break; case SNAPSHOT_UNFREEZE: if (!data->frozen || data->ready) break; mutex_lock(&pm_mutex); thaw_processes(); mutex_unlock(&pm_mutex); data->frozen = 0; break; case SNAPSHOT_ATOMIC_SNAPSHOT: if (data->mode != O_RDONLY || !data->frozen || data->ready) { error = -EPERM; break; } error = snapshot_suspend(data->platform_suspend); if (!error) error = put_user(in_suspend, (unsigned 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 = snapshot_restore(data->platform_suspend); break; case SNAPSHOT_FREE: swsusp_free(); memset(&data->handle, 0, sizeof(struct snapshot_handle)); data->ready = 0; break; case SNAPSHOT_SET_IMAGE_SIZE: image_size = arg; break; case SNAPSHOT_AVAIL_SWAP: avail = count_swap_pages(data->swap, 1); avail <<= PAGE_SHIFT; error = put_user(avail, (loff_t __user *)arg); break; case SNAPSHOT_GET_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, (sector_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: 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 (!pm_ops) { error = -ENOSYS; break; } if (!data->frozen) { error = -EPERM; 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 { error = disable_nonboot_cpus(); if (!error) { /* Enter S3, system is already frozen */ suspend_enter(PM_SUSPEND_MEM); enable_nonboot_cpus(); } /* Wake up devices */ device_resume(); } resume_console(); if (pm_ops->finish) pm_ops->finish(PM_SUSPEND_MEM); OutS3: mutex_unlock(&pm_mutex); break; case SNAPSHOT_PMOPS: error = -EINVAL; switch (arg) { case PMOPS_PREPARE: if (hibernation_ops) { data->platform_suspend = 1; error = 0; } else { error = -ENOSYS; } break; case PMOPS_ENTER: if (data->platform_suspend) { kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK); error = hibernation_ops->enter(); } break; case PMOPS_FINISH: if (data->platform_suspend) 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 = old_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; } return error; }
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 = freeze_processes(); if (!error) data->frozen = 1; break; case SNAPSHOT_UNFREEZE: if (!data->frozen || data->ready) break; pm_restore_gfp_mask(); thaw_processes(); data->frozen = 0; break; 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); data->ready = !freezer_test_done && !error; freezer_test_done = false; } 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; thaw_kernel_threads(); break; 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_SIZE: size = count_swap_pages(data->swap, 1); size <<= PAGE_SHIFT; error = put_user(size, (loff_t __user *)arg); break; 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_S2RAM: if (!data->frozen) { error = -EPERM; break; } 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_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; } 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; }