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Hibernation: Introduce SNAPSHOT_GET_IMAGE_SIZE ioctl

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Add a new ioctl, SNAPSHOT_GET_IMAGE_SIZE, returning the size of the (just
created) hibernation image, to the hibernation userland interface.

This ioctl is necessary so that the userland utilities using the interface need
not access the hibernation image header, owned by the kernel, in order to obtain
the size of the image.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki
2007-10-26 00:59:31 +02:00
committed by Len Brown
parent aa62999269
commit af508b34d2
4 changed files with 28 additions and 13 deletions
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7
kernel/power/snapshot.c
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@@ -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);