C block script implementation

This C program should be significantly faster than the shell script
version.  It does no locking and creates no subprocesses.  Furthermore,
the C program uses the Linux diskseq feature to ensure that Linux opens
the correct block device.  This requires kernel support that is not yet
upstreamed.

Makefile

@@ -10,6 +10,7 @@ all:
 	$(MAKE) -C qrexec-lib all
 	$(MAKE) -C qmemman all
 	$(MAKE) -C imgconverter all
+	$(MAKE) -C not-script all
 selinux:
 	$(MAKE) -f /usr/share/selinux/devel/Makefile -C selinux qubes-meminfo-writer.pp
 
@@ -18,6 +19,7 @@ install:
 	$(MAKE) -C qrexec-lib install
 	$(MAKE) -C qmemman install
 	$(MAKE) -C imgconverter install
+	$(MAKE) -C not-script install
 
 install-selinux:
 	install -m 0644 -D -t $(DESTDIR)/usr/share/selinux/packages selinux/qubes-meminfo-writer.pp
@@ -37,6 +39,7 @@ clean:
 	$(MAKE) -C qrexec-lib clean
 	$(MAKE) -C qmemman clean
 	$(MAKE) -C imgconverter clean
+	$(MAKE) -C not-script clean
 	rm -rf selinux/*.pp selinux/tmp/
 	rm -rf debian/changelog.*
 	rm -rf pkgs

archlinux/PKGBUILD

@@ -31,8 +31,8 @@ md5sums=(SKIP)
 
 build() {
 
-for source in qrexec-lib udev qmemman core kernel-modules Makefile dracut imgconverter grub; do
-  (ln -s -- "$srcdir/../$source" "$srcdir/$source")
+for source in qrexec-lib udev qmemman core kernel-modules Makefile dracut imgconverter grub not-script; do
+  ln -s -- "$srcdir/../$source" "$srcdir/$source"
 done
 
 make all

debian/qubes-utils.install

@@ -3,3 +3,4 @@ lib/systemd/system/qubes-meminfo-writer.service
 usr/lib/qubes/*
 usr/lib/udev/*
 usr/lib/tmpfiles.d/xen-devices-qubes.conf
+etc/xen/scripts/qubes-block

not-script/Makefile

@@ -0,0 +1,16 @@
+CC=gcc
+CFLAGS := $(CFLAGS) -g3 -O2 -Wall -Wextra -Werror -fPIE -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE
+.PHONY: clean install all
+all: not-script
+
+%: %.c Makefile
+	 s=$$(pkg-config --cflags --libs xenstore) && $(CC) $(CFLAGS) -MD -MP -MF $@.dep -o $@ $< $$s
+
+clean:
+	rm -f ./*.o ./*~ ./*.a ./*.so.* ./*.dep unicode-class-table.c
+
+install:
+	install -d $(DESTDIR)/etc/xen/scripts
+	install not-script $(DESTDIR)/etc/xen/scripts/qubes-block
+
+-include ./*.o.dep