resume: Add support for resume_offset swap file suspend to disk.

Parse cmdline for resume_offset, export it and pass it to
the klibc resume binary.
Based on a patch by Alan Jenkins <alan-jenkins@tuffmail.co.uk>.

Bonus small codingstyle clean up of local-premount/resume.

2 files changed, 11 insertions, 5 deletions

diff --git a/init b/init
index 3a93ef8..70f4384 100755
--- a/init
+++ b/init
@@ -50,6 +50,7 @@ export rootmnt=/root
 export debug=
 export panic=
 export blacklist=
+export resume_offset=
 
 # Parse command line options
 for x in $(cat /proc/cmdline); do
@@ -97,6 +98,9 @@ for x in $(cat /proc/cmdline); do
 	resume=*)
 		RESUME="${x#resume=}"
 		;;
+	resume_offset=*)
+		resume_offset="${x#resume_offset=}"
+		;;
 	noresume)
 		noresume=y
 		;;
diff --git a/scripts/local-premount/resume b/scripts/local-premount/resume
index d997f81..6bf95e5 100755
--- a/scripts/local-premount/resume
+++ b/scripts/local-premount/resume
@@ -28,11 +28,13 @@ case $resume in
 	;;
 esac
 
-if [ ! -e "${resume}" ]; then
-	exit 0
-fi
+[ ! -e "${resume}" ] && exit 0
+
+[ ! -e /sys/power/resume ] && exit 0
 
-if [ -e /sys/power/resume ]; then
-	# hardcode path, uswsusp ships an resume binary too
+# hardcode path, uswsusp ships an resume binary too
+if [ -n "${resume_offset}" ]; then
+	/bin/resume ${resume} ${resume_offset}
+else
 	/bin/resume ${resume}
 fi