aufs stdalone: make it standalone

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

.gitignore

+usr

Makefile

+# SPDX-License-Identifier: GPL-2.0
+
+KDIR = /lib/modules/$(shell uname -r)/build
+Conf1=${KDIR}/include/config/auto.conf
+Conf2=${KDIR}/.config
+ifeq "t" "$(shell test -e ${Conf1} && echo t)"
+include ${Conf1}
+else ifeq "t" "$(shell test -e ${Conf2} && echo t)"
+include ${Conf2}
+else
+$(warning could not find kernel config file. internal auto-config may fail)
+endif
+
+CONFIG_AUFS_FS = m
+AUFS_DEF_CONFIG = -DCONFIG_AUFS_FS_MODULE -UCONFIG_AUFS
+include config.mk
+export CONFIG_AUFS_FS
+
+EXTRA_CFLAGS := -I${CURDIR}/include
+EXTRA_CFLAGS += ${AUFS_DEF_CONFIG}
+
+MakeMod = -C ${KDIR} M=${CURDIR}/fs/aufs EXTRA_CFLAGS="${EXTRA_CFLAGS}"
+
+all: aufs.ko usr/include/linux/aufs_type.h
+
+clean:
+	${MAKE} ${MakeMod} $@
+	find . -type f -name '*~' | xargs -r ${RM}
+	${RM} -r aufs.ko usr
+
+install: fs/aufs/aufs.ko
+	${MAKE} ${MakeMod} modules_install
+
+install_header install_headers: usr/include/linux/aufs_type.h
+	install -o root -g root -p usr/include/linux/aufs_type.h \
+		${DESTDIR}/usr/include/linux
+
+aufs.ko: fs/aufs/aufs.ko
+	ln -f $< $@
+
+fs/aufs/aufs.ko:
+	@echo ${EXTRA_CFLAGS}
+	${MAKE} ${MakeMod} modules
+
+usr/include/linux/aufs_type.h: d = $(shell echo ${CURDIR} | cut -c2-)
+usr/include/linux/aufs_type.h:
+	${MAKE} -rR -C ${KDIR} \
+		-f scripts/Makefile.headersinst \
+		-f Makefile \
+		obj=${d}/include/uapi/linux dst=${d}/usr/include/linux
+	test -s $@

README

+./Documentation/filesystems/aufs/README
\ No newline at end of file

config.mk

+# SPDX-License-Identifier: GPL-2.0
+
+# Kconfig
+# instead of setting 'n', leave it blank when you disable it.
+CONFIG_AUFS_BRANCH_MAX_127 = y
+CONFIG_AUFS_BRANCH_MAX_511 =
+CONFIG_AUFS_BRANCH_MAX_1023 =
+#CONFIG_AUFS_BRANCH_MAX_32767 =
+CONFIG_AUFS_SBILIST = y
+CONFIG_AUFS_HNOTIFY =
+CONFIG_AUFS_HFSNOTIFY =
+CONFIG_AUFS_EXPORT =
+CONFIG_AUFS_XATTR =
+CONFIG_AUFS_FHSM =
+CONFIG_AUFS_RDU =
+CONFIG_AUFS_SHWH =
+CONFIG_AUFS_BR_RAMFS =
+CONFIG_AUFS_BR_FUSE =
+CONFIG_AUFS_BR_HFSPLUS =
+CONFIG_AUFS_DEBUG = y
+CONFIG_AUFS_DIRREN =
+CONFIG_AUFS_MAGIC_SYSRQ =
+CONFIG_AUFS_BDEV_LOOP =
+CONFIG_AUFS_INO_T_64 =
+CONFIG_AUFS_POLL =
+
+########################################
+
+define conf
+ifdef $(1)
+AUFS_DEF_CONFIG += -D$(1)
+export $(1)
+endif
+endef
+
+$(foreach i, BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 \
+	BRANCH_MAX_32767 \
+	HNOTIFY HFSNOTIFY \
+	SBILIST \
+	EXPORT INO_T_64 \
+	XATTR \
+	FHSM \
+	RDU \
+	SHWH \
+	BR_RAMFS \
+	BR_FUSE POLL \
+	BR_HFSPLUS \
+	DEBUG MAGIC_SYSRQ \
+	BDEV_LOOP, \
+	$(eval $(call conf,CONFIG_AUFS_$(i))))
+
+########################################
+
+ifdef CONFIG_AUFS_SBILIST
+ifndef CONFIG_AUFS_MAGIC_SYSRQ
+ifndef CONFIG_PROC_FS
+$(warning CONFIG_AUFS_SBILIST is enabled but CONFIG_AUFS_MAGIC_SYSRQ nor CONFIG_PROC_FS)
+endif
+endif
+else ifdef CONFIG_AUFS_MAGIC_SYSRQ
+$(error CONFIG_AUFS_SBILIST is disabled but CONFIG_AUFS_MAGIC_SYSRQ)
+else ifdef CONFIG_PROC_FS
+$(error CONFIG_AUFS_SBILIST is disabled but CONFIG_PROC_FS)
+endif
+
+ifdef CONFIG_AUFS_HFSNOTIFY
+ifndef CONFIG_FSNOTIFY
+$(error CONFIG_AUFS_HFSNOTIFY requires CONFIG_FSNOTIFY)
+endif
+ifndef CONFIG_AUFS_HNOTIFY
+$(error CONFIG_AUFS_HFSNOTIFY requires CONFIG_AUFS_HNOTIFY)
+endif
+endif
+
+ifdef CONFIG_AUFS_EXPORT
+ifndef CONFIG_EXPORTFS
+$(error CONFIG_AUFS_EXPORT requires CONFIG_EXPORTFS)
+endif
+endif
+
+ifdef CONFIG_AUFS_BR_HFSPLUS
+ifndef CONFIG_HFSPLUS_FS
+$(error CONFIG_AUFS_BR_HFSPLUS requires CONFIG_HFSPLUS_FS)
+endif
+endif
+
+ifdef CONFIG_AUFS_MAGIC_SYSRQ
+ifndef CONFIG_AUFS_DEBUG
+$(error CONFIG_AUFS_MAGIC_SYSRQ requires CONFIG_AUFS_DEBUG)
+endif
+ifndef CONFIG_MAGIC_SYSRQ
+$(error CONFIG_AUFS_MAGIC_SYSRQ requires CONFIG_MAGIC_SYSRQ)
+endif
+endif
+
+ifdef CONFIG_AUFS_BDEV_LOOP
+ifndef CONFIG_BLK_DEV_LOOP
+$(error CONFIG_AUFS_BDEV_LOOP requires CONFIG_BLK_DEV_LOOP)
+endif
+endif
+
+ifdef CONFIG_AUFS_INO_T_64
+ifndef CONFIG_AUFS_EXPORT
+$(error CONFIG_AUFS_INO_T_64 requires CONFIG_AUFS_EXPORT)
+endif
+ifdef CONFIG_64BIT
+ifdef CONFIG_ALPHA
+$(error ino_t on ALPHA is not 64bit)
+endif
+ifdef CONFIG_S390
+$(error ino_t on S390 is not 64bit)
+endif
+else
+$(error ino_t is not 64bit)
+endif
+endif
+
+ifdef CONFIG_AUFS_POLL
+ifndef CONFIG_AUFS_BR_FUSE
+# this is not an error
+$(warning AUFS_POLL is enabled but AUFS_BR_FUSE)
+endif
+else ifdef CONFIG_AUFS_BR_FUSE
+$(error AUFS_POLL is disabled but AUFS_BR_FUSE)
+endif
+
+ifdef CONFIG_AUFS_BR_FUSE
+ifndef CONFIG_FUSE_FS
+# this is not an error
+$(warning AUFS_BR_FUSE is enabled but FUSE_FS)
+endif
+endif

fs/aufs/Makefile

 # SPDX-License-Identifier: GPL-2.0
 
-include ${srctree}/${src}/magic.mk
+include ${src}/magic.mk
 ifeq (${CONFIG_AUFS_FS},m)
-include ${srctree}/${src}/conf.mk
+include ${src}/conf.mk
 endif
--include ${srctree}/${src}/priv_def.mk
+-include ${src}/priv_def.mk
 
 # cf. include/linux/kernel.h
 # enable pr_debug

include/uapi/linux/Kbuild

+header-y = aufs_type.h