[Suspend2][ 06/16] [Suspend2] Check if still keeping an existing image.

[Nigel Cunningham <nigel@suspend2.net>]

Suspend2 supports a keep-the-image mode, which can be used when the
contents of mounted filesystems don't change. Writeable storage can still
be used, but it needs to be unmounted while suspending and remounted on
resume.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/suspend.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 06ab034..6457d75 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -488,3 +488,17 @@ static void free_metadata(void)
 	free_dyn_pageflags(&in_use_map);
 }
 
+static int check_still_keeping_image(void)
+{
+	if (test_action_state(SUSPEND_KEEP_IMAGE)) {
+		printk("Image already stored: powering down immediately.");
+		suspend_power_down();
+		return 1;	/* Just in case we're using S3 */
+	}
+
+	printk("Invalidating previous image.\n");
+	suspend_active_writer->invalidate_image();
+
+	return 0;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net