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authorRafael J. Wysocki <rjw@sisk.pl>2007-10-26 00:59:31 +0200
committerLen Brown <len.brown@intel.com>2008-02-01 18:30:52 -0500
commitaf508b34d27e3341287d89e0eae6752fdb1b873f (patch)
treeb5d2a337d78dc25aadb02d481443d484e0dd368c /kernel/power/snapshot.c
parentaa6299926950c8dfe2fea638276cad6def092bc9 (diff)
downloadop-kernel-dev-af508b34d27e3341287d89e0eae6752fdb1b873f.zip
op-kernel-dev-af508b34d27e3341287d89e0eae6752fdb1b873f.tar.gz
Hibernation: Introduce SNAPSHOT_GET_IMAGE_SIZE ioctl
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>
Diffstat (limited to 'kernel/power/snapshot.c')
-rw-r--r--kernel/power/snapshot.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 78039b4..c5ce0f3 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);
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