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kernel: rework Initramfs locking logic

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Rework CompileImage/Initramfs locking logic to fix race condition on
concurrent access/compilation.

Rework each intermediate step and group them under one single execution
block. Protect this with a new lock, 'gen-initramfs' and rename the
compile initramfs to compile-initramfs lock name.

This is done to handle corner case scenario where a rootfs with the same
hash ID is generated at the same time. To handle this, we execute
everything under lock and use a specific hash ID lock to prevent
concurrent access/compilation.

Link: https://github.com/openwrt/openwrt/pull/16404
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
This commit is contained in:
Christian Marangi 2024-09-16 18:34:09 +02:00
parent 802be2457f
commit 52cc9d82f1
No known key found for this signature in database
GPG key ID: AC001D09ADBFEAD7
1 changed files with 80 additions and 61 deletions
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125
include/kernel-defaults.mk
View file

@ -48,42 +48,56 @@ endif
ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),y) ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),y)
ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE),y) ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE),y)
define Kernel/SetInitramfs/PreConfigure define Kernel/SetInitramfs/PreConfigure
grep -v -e CONFIG_BLK_DEV_INITRD $(2)/.config.old > $(2)/.config { \
echo 'CONFIG_BLK_DEV_INITRD=y' >> $(2)/.config grep -v -e CONFIG_BLK_DEV_INITRD $(2)/.config.old > $(2)/.config; \
echo 'CONFIG_INITRAMFS_SOURCE=""' >> $(2)/.config echo 'CONFIG_BLK_DEV_INITRD=y' >> $(2)/.config; \
echo 'CONFIG_INITRAMFS_SOURCE=""' >> $(2)/.config; \
}
endef endef
else else
ifeq ($(strip $(CONFIG_EXTERNAL_CPIO)),"") ifeq ($(strip $(CONFIG_EXTERNAL_CPIO)),"")
define Kernel/SetInitramfs/PreConfigure define Kernel/SetInitramfs/PreConfigure
grep -v -e INITRAMFS -e CONFIG_RD_ -e CONFIG_BLK_DEV_INITRD $(2)/.config.old > $(2)/.config { \
echo 'CONFIG_BLK_DEV_INITRD=y' >> $(2)/.config grep -v -e INITRAMFS -e CONFIG_RD_ -e CONFIG_BLK_DEV_INITRD $(2)/.config.old > $(2)/.config; \
echo 'CONFIG_INITRAMFS_SOURCE="$(strip $(1) $(INITRAMFS_EXTRA_FILES))"' >> $(2)/.config echo 'CONFIG_BLK_DEV_INITRD=y' >> $(2)/.config; \
echo 'CONFIG_INITRAMFS_SOURCE="$(strip $(1) $(INITRAMFS_EXTRA_FILES))"' >> $(2)/.config; \
}
endef endef
else else
define Kernel/SetInitramfs/PreConfigure define Kernel/SetInitramfs/PreConfigure
grep -v INITRAMFS $(2)/.config.old > $(2)/.config { \
echo 'CONFIG_INITRAMFS_SOURCE="$(call qstrip,$(CONFIG_EXTERNAL_CPIO))"' >> $(2)/.config grep -v INITRAMFS $(2)/.config.old > $(2)/.config; \
echo 'CONFIG_INITRAMFS_SOURCE="$(call qstrip,$(CONFIG_EXTERNAL_CPIO))"' >> $(2)/.config; \
}
endef endef
endif endif
endif endif
define Kernel/SetInitramfs define Kernel/SetInitramfs
rm -f $(2)/.config.prev { \
mv $(2)/.config $(2)/.config.old rm -f $(2)/.config.prev; \
$(call Kernel/SetInitramfs/PreConfigure,$(1),$(2)) mv $(2)/.config $(2)/.config.old; \
echo "# CONFIG_INITRAMFS_PRESERVE_MTIME is not set" >> $(2)/.config $(call Kernel/SetInitramfs/PreConfigure,$(1),$(2)); \
ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE),y) echo "# CONFIG_INITRAMFS_PRESERVE_MTIME is not set" >> $(2)/.config; \
echo 'CONFIG_INITRAMFS_ROOT_UID=$(shell id -u)' >> $(2)/.config $(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE),,echo "CONFIG_INITRAMFS_ROOT_UID=$(shell id -u)" >> $(2)/.config;) \
echo 'CONFIG_INITRAMFS_ROOT_GID=$(shell id -g)' >> $(2)/.config $(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE),,echo "CONFIG_INITRAMFS_ROOT_GID=$(shell id -g)" >> $(2)/.config;) \
echo "$(if $(CONFIG_TARGET_INITRAMFS_FORCE),CONFIG_INITRAMFS_FORCE=y,# CONFIG_INITRAMFS_FORCE is not set)" >> $(2)/.config $(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE), \
else echo "# CONFIG_INITRAMFS_FORCE is not set" >> $(2)/.config;, \
echo "# CONFIG_INITRAMFS_FORCE is not set" >> $(2)/.config $(if $(CONFIG_TARGET_INITRAMFS_FORCE), \
endif echo "CONFIG_INITRAMFS_FORCE=y" >> $(2)/.config;, \
echo "$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_NONE),CONFIG_INITRAMFS_COMPRESSION_NONE=y,# CONFIG_INITRAMFS_COMPRESSION_NONE is not set)" >> $(2)/.config echo "# CONFIG_INITRAMFS_FORCE is not set" >> $(2)/.config;)) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_NONE), \
echo "CONFIG_INITRAMFS_COMPRESSION_NONE=y" >> $(2)/.config;, \
echo "# CONFIG_INITRAMFS_COMPRESSION_NONE is not set" >> $(2)/.config; ) \
$(foreach ALGO,GZIP BZIP2 LZMA LZO XZ LZ4 ZSTD, \ $(foreach ALGO,GZIP BZIP2 LZMA LZO XZ LZ4 ZSTD, \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_$(ALGO)),\ $(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_$(ALGO)), \
echo -e "CONFIG_INITRAMFS_COMPRESSION_$(ALGO)=y\nCONFIG_RD_$(ALGO)=y" >> $(2)/.config;,\ echo "CONFIG_INITRAMFS_COMPRESSION_$(ALGO)=y" >> $(2)/.config; $\, \
echo -e "# CONFIG_INITRAMFS_COMPRESSION_$(ALGO) is not set\n# CONFIG_RD_$(ALGO) is not set" >> $(2)/.config;)) echo "# CONFIG_INITRAMFS_COMPRESSION_$(ALGO) is not set" >> $(2)/.config; $\) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_$(ALGO)), \
echo "CONFIG_RD_$(ALGO)=y" >> $(2)/.config; $\, \
echo "# CONFIG_RD_$(ALGO) is not set" >> $(2)/.config; $\) \
) \
}
endef endef
else else
endif endif
@ -157,10 +171,10 @@ define Kernel/CompileImage/Default
endef endef
define Kernel/PrepareConfigPerRootfs define Kernel/PrepareConfigPerRootfs
[ ! -d "$(1)" ] || rm -rf $(1) { \
mkdir $(1) [ ! -d "$(1)" ] || rm -rf $(1); \
mkdir $(1) && $(CP) $(LINUX_DIR)/.config $(1); \
$(CP) $(LINUX_DIR)/.config $(1) }
endef endef
ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),) ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
@ -169,32 +183,37 @@ ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
# For Separate Initramf with $2 declared, skip kernel compile, it has # For Separate Initramf with $2 declared, skip kernel compile, it has
# already been done previously on generic image build # already been done previously on generic image build
define Kernel/CompileImage/Initramfs define Kernel/CompileImage/Initramfs
$(if $(2),$(call Kernel/PrepareConfigPerRootfs,$(LINUX_DIR)$(2))) $(call locked,{ \
$(call Kernel/Configure/Initramfs,$(if $(1),$(1),$(TARGET_DIR)),$(LINUX_DIR)$(2)) $(if $(2),$(call Kernel/PrepareConfigPerRootfs,$(LINUX_DIR)$(2));) \
$(CP) $(GENERIC_PLATFORM_DIR)/other-files/init $(if $(1),$(1),$(TARGET_DIR))/init $(call Kernel/Configure/Initramfs,$(if $(1),$(1),$(TARGET_DIR)),$(LINUX_DIR)$(2)); \
$(if $(SOURCE_DATE_EPOCH),touch -hcd "@$(SOURCE_DATE_EPOCH)" $(if $(1),$(1),$(TARGET_DIR)) $(if $(1),$(1),$(TARGET_DIR))/init) $(CP) $(GENERIC_PLATFORM_DIR)/other-files/init $(if $(1),$(1),$(TARGET_DIR))/init; \
ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE),y) $(if $(SOURCE_DATE_EPOCH),touch -hcd "@$(SOURCE_DATE_EPOCH)" $(if $(1),$(1),$(TARGET_DIR)) $(if $(1),$(1),$(TARGET_DIR))/init;) \
ifneq ($(call qstrip,$(CONFIG_EXTERNAL_CPIO)),) $(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE), \
$(CP) $(CONFIG_EXTERNAL_CPIO) $(KERNEL_BUILD_DIR)/initrd.cpio$(2) $(if $(call qstrip,$(CONFIG_EXTERNAL_CPIO)), \
else $(CP) $(CONFIG_EXTERNAL_CPIO) $(KERNEL_BUILD_DIR)/initrd.cpio;,\
( cd $(if $(1),$(1),$(TARGET_DIR)); find . | LC_ALL=C sort | $(STAGING_DIR_HOST)/bin/cpio --reproducible -o -H newc -R 0:0 > $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio ) ( cd $(if $(1),$(1),$(TARGET_DIR)); find . | LC_ALL=C sort | $(STAGING_DIR_HOST)/bin/cpio --reproducible -o -H newc -R 0:0 > $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio );) \
endif $(if $(SOURCE_DATE_EPOCH), \
$(if $(SOURCE_DATE_EPOCH),touch -hcd "@$(SOURCE_DATE_EPOCH)" $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio) touch -hcd "@$(SOURCE_DATE_EPOCH)" $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_BZIP2),$(STAGING_DIR_HOST)/bin/bzip2 -9 -c < $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio > $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio.bzip2) $(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_BZIP2), \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_GZIP),$(STAGING_DIR_HOST)/bin/libdeflate-gzip -n -f -S .gzip -12 $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio) $(STAGING_DIR_HOST)/bin/bzip2 -9 -c < $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio > $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio.bzip2;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZ4),$(STAGING_DIR_HOST)/bin/lz4c -l -c1 -fz --favor-decSpeed $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio) $(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_GZIP), \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZMA),$(STAGING_DIR_HOST)/bin/lzma e -lc1 -lp2 -pb2 $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio.lzma) $(STAGING_DIR_HOST)/bin/libdeflate-gzip -n -f -S .gzip -12 $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZO),$(STAGING_DIR_HOST)/bin/lzop -9 -f $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio) $(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZ4), \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_XZ),$(STAGING_DIR_HOST)/bin/xz -T$(if $(filter 1,$(NPROC)),2,0) -9 -fz --check=crc32 $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio) $(STAGING_DIR_HOST)/bin/lz4c -l -c1 -fz --favor-decSpeed $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_ZSTD),$(STAGING_DIR_HOST)/bin/zstd -T0 -f -o $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio.zstd $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio) $(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZMA), \
$(if $(2),,$(KERNEL_MAKE) $(KERNEL_MAKEOPTS_IMAGE) $(if $(KERNELNAME),$(KERNELNAME),all)) $(STAGING_DIR_HOST)/bin/lzma e -lc1 -lp2 -pb2 $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio.lzma;) \
$(call Kernel/CopyImage,-initramfs,$(2)) $(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZO), \
else $(STAGING_DIR_HOST)/bin/lzop -9 -f $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio;) \
+$(call locked,$(if $(2),$(CP) $(LINUX_DIR)$(2)/.config* $(LINUX_DIR) && touch $(LINUX_DIR)/.config && )\ $(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_XZ), \
$(STAGING_DIR_HOST)/bin/xz -T$(if $(filter 1,$(NPROC)),2,0) -9 -fz --check=crc32 $(KERNEL_BUILD_DIR)/initrd.cpio;) \
$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_ZSTD), \
$(STAGING_DIR_HOST)/bin/zstd -T0 -f -o $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio.zstd $(if $(2),$(LINUX_DIR)$(2),$(KERNEL_BUILD_DIR))/initrd.cpio;) \
$(if $(2),,$(KERNEL_MAKE) $(KERNEL_MAKEOPTS_IMAGE) $(if $(KERNELNAME),$(KERNELNAME),all);),\
$(call locked,$(if $(2),$(CP) $(LINUX_DIR)$(2)/.config* $(LINUX_DIR) && touch $(LINUX_DIR)/.config && ) \
rm -rf $(LINUX_DIR)/usr/initramfs_data.cpio* $(LINUX_DIR)/.config.prev && \ rm -rf $(LINUX_DIR)/usr/initramfs_data.cpio* $(LINUX_DIR)/.config.prev && \
$(KERNEL_MAKE) $(KERNEL_MAKEOPTS_IMAGE) $(if $(KERNELNAME),$(KERNELNAME),all) && \ $(KERNEL_MAKE) $(KERNEL_MAKEOPTS_IMAGE) $(if $(KERNELNAME),$(KERNELNAME),all), compile-initramfs);) \
{ $(call Kernel/CopyImage,-initramfs,$(2)) },gen-initramfs) $(call Kernel/CopyImage,-initramfs,$(2)); \
endif }, gen-initramfs$(if $(2),-$(2)));
endef endef
else else
define Kernel/CompileImage/Initramfs define Kernel/CompileImage/Initramfs