1. 根目录:
2. drivers
3. md
4. bcache
5. Makefile

obj-$(CONFIG_BCACHE)	+= bcache.o

bcache-y		:= alloc.o bset.o btree.o closure.o debug.o extents.o\
	io.o journal.o movinggc.o request.o stats.o super.o sysfs.o trace.o\
	util.o writeback.o

CFLAGS_request.o	+= -Iblock