refactor(rootfs): replace btrfs with erofs (#43)

In our scenario, the rootfs is read-only and write operations are provided based on overlayfs. Therefore, we do not need to use the btrfs format. As a result, the size of the rootfs has been compressed to around 100M from the previous 1.6G. Signed-off-by: Black-Hole1 <bh@bugs.cc>
oomol-lab · Dec 14, 2023 · 5045d42 · 5045d42
1 parent 5d623b5
commit 5045d42
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Showing 5 changed files with 9 additions and 5 deletions.
diff --git a/buildroot_external/board/ovm/init/rootfs-overlay/sbin/init b/buildroot_external/board/ovm/init/rootfs-overlay/sbin/init
@@ -24,7 +24,7 @@ fi;
 
 
 # mount rootfs
-mount -n -m -t btrfs /dev/vda /mnt/rootfs
+mount -n -m -t erofs /dev/vda /mnt/rootfs
 
 # force format vdb
 mkfs.btrfs -q -f /dev/vdb

diff --git a/buildroot_external/configs/rootfs_amd64_defconfig b/buildroot_external/configs/rootfs_amd64_defconfig
@@ -152,8 +152,9 @@ BR2_PACKAGE_UTIL_LINUX_WRITE=y
 BR2_PACKAGE_UTIL_LINUX_ZRAMCTL=y
 BR2_PACKAGE_LESS=y
 BR2_PACKAGE_NANO=y
-BR2_TARGET_ROOTFS_BTRFS=y
-BR2_TARGET_ROOTFS_BTRFS_SIZE="1500m"
+BR2_TARGET_ROOTFS_EROFS=y
+BR2_TARGET_ROOTFS_EROFS_LZ4HC=y
+BR2_TARGET_ROOTFS_EROFS_PCLUSTERSIZE=40960
 BR2_PACKAGE_HOST_E2TOOLS=y
 BR2_PACKAGE_HOST_GENIMAGE=y
 BR2_PACKAGE_HOST_PWGEN=y

diff --git a/buildroot_external/configs/rootfs_arm64_defconfig b/buildroot_external/configs/rootfs_arm64_defconfig
@@ -152,8 +152,9 @@ BR2_PACKAGE_UTIL_LINUX_WRITE=y
 BR2_PACKAGE_UTIL_LINUX_ZRAMCTL=y
 BR2_PACKAGE_LESS=y
 BR2_PACKAGE_NANO=y
-BR2_TARGET_ROOTFS_BTRFS=y
-BR2_TARGET_ROOTFS_BTRFS_SIZE="1500m"
+BR2_TARGET_ROOTFS_EROFS=y
+BR2_TARGET_ROOTFS_EROFS_LZ4HC=y
+BR2_TARGET_ROOTFS_EROFS_PCLUSTERSIZE=40960
 BR2_PACKAGE_HOST_E2TOOLS=y
 BR2_PACKAGE_HOST_GENIMAGE=y
 BR2_PACKAGE_HOST_PWGEN=y

diff --git a/kernel_external/configs/kernel_amd64_defconfig b/kernel_external/configs/kernel_amd64_defconfig
@@ -679,6 +679,7 @@ CONFIG_SQUASHFS_XZ=y
 CONFIG_SQUASHFS_ZSTD=y
 CONFIG_SQUASHFS_4K_DEVBLK_SIZE=y
 CONFIG_ROMFS_FS=y
+CONFIG_EROFS_FS=y
 CONFIG_VBOXSF_FS=y
 CONFIG_NFS_FS=y
 CONFIG_NFS_V3_ACL=y

diff --git a/kernel_external/configs/kernel_arm64_defconfig b/kernel_external/configs/kernel_arm64_defconfig
@@ -690,6 +690,7 @@ CONFIG_PSTORE_LZO_COMPRESS=y
 CONFIG_PSTORE_LZ4_COMPRESS=y
 CONFIG_PSTORE_ZSTD_COMPRESS=y
 CONFIG_PSTORE_ZSTD_COMPRESS_DEFAULT=y
+CONFIG_EROFS_FS=y
 CONFIG_NFS_FS=y
 CONFIG_NFS_V4=y
 CONFIG_NFS_V4_1=y