diff options
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/power.h | 4 | ||||
| -rw-r--r-- | kernel/power/snapshot.c | 7 | ||||
| -rw-r--r-- | kernel/power/user.c | 18 |
3 files changed, 23 insertions, 6 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h index 2093c3a9a994..23c17031ed21 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -128,6 +128,7 @@ struct snapshot_handle { #define data_of(handle) ((handle).buffer + (handle).buf_offset) extern unsigned int snapshot_additional_pages(struct zone *zone); +extern unsigned long snapshot_get_image_size(void); extern int snapshot_read_next(struct snapshot_handle *handle, size_t count); extern int snapshot_write_next(struct snapshot_handle *handle, size_t count); extern void snapshot_write_finalize(struct snapshot_handle *handle); @@ -158,7 +159,8 @@ struct resume_swap_area { #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int) #define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \ struct resume_swap_area) -#define SNAPSHOT_IOC_MAXNR 13 +#define SNAPSHOT_GET_IMAGE_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 14, loff_t) +#define SNAPSHOT_IOC_MAXNR 14 #define PMOPS_PREPARE 1 #define PMOPS_ENTER 2 diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 78039b477d2b..c5ce0f34a5d4 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -1264,12 +1264,17 @@ static char *check_image_kernel(struct swsusp_info *info) } #endif /* CONFIG_ARCH_HIBERNATION_HEADER */ +unsigned long snapshot_get_image_size(void) +{ + return nr_copy_pages + nr_meta_pages + 1; +} + static int init_header(struct swsusp_info *info) { memset(info, 0, sizeof(struct swsusp_info)); info->num_physpages = num_physpages; info->image_pages = nr_copy_pages; - info->pages = nr_copy_pages + nr_meta_pages + 1; + info->pages = snapshot_get_image_size(); info->size = info->pages; info->size <<= PAGE_SHIFT; return init_header_complete(info); diff --git a/kernel/power/user.c b/kernel/power/user.c index 5bd321bcbb75..88aac26e598a 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -133,7 +133,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp, { int error = 0; struct snapshot_data *data; - loff_t avail; + loff_t size; sector_t offset; if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC) @@ -210,10 +210,20 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp, 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: - 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_GET_SWAP_PAGE: |