Me := $(lastword ${MAKEFILE_LIST})
include var.mk

Patches = 'http://marc.info/?l=linux-fsdevel&m=127884119303014&q=raw' \
	'http://marc.info/?l=linux-fsdevel&m=127884119203011&q=raw' \
	'http://marc.info/?l=linux-fsdevel&m=127884119303017&q=raw'
Sq40ParaDir = sq40para

all:
	@echo \- Get linux-2.6.${KVer} and extract it under a dir named ${Linux26}
	@echo \- Build linux-2.6.${KVer} by \"cd ${Linux26} '&& make &&' make headers_install\"
	@echo \- Get squashfs4.0 parallel decompression patch by \"make -f ${Me} download\"
	@echo \- Apply the patches to linux-2.6.${KVer} and build the module by \"make -f ${Me} build\"
	@echo -e \\t+ The build process uses AUFS by default. If you don\'t install AUFS, then define NoBuildByAUFS by \"make -f ${Me} NoBuildByAUFS=1 build\"

clean:
	${RM} -r ${Sq40ParaDir}

realclean: clean
	${RM} -r sq40para.*.patch sq40para-download

download build: %: sq40para-%

########################################

sq40para-download:
	n=0; \
	for i in ${Patches}; \
	do \
		wget --no-verbose $${i} -O sq40para.$${n}.patch; \
		n=$$(($${n} + 1)); \
	done
	touch $@

define ApplySq40para
	for i in sq40para.*.patch; \
	do patch -s -d ${1} -p3 < $${i}; \
	done
endef

sq40para-build: dir = ${Linux26}/fs/squashfs
sq40para-build: sq40para-download
	mkdir -p ${Sq40ParaDir}
ifdef NoBuildByAUFS
	lndir -silent ${dir} ${Sq40ParaDir}
	${RM} ${Sq40ParaDir}/*.o ${Sq40ParaDir}/*.ko
	$(call ApplySq40para, ${Sq40ParaDir})
	${MAKE} -C ${Linux26} M=${CURDIR}/${Sq40ParaDir} modules
else
	sudo mount -t aufs -o br=${Sq40ParaDir}:${dir} none ${dir}
	$(call ApplySq40para, ${dir})
	${MAKE} -C ${Linux26} modules
	sudo umount ${dir}
endif