Buildroot 扩展文件系统大小

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在Ubuntu 16.04上使用Buildroot-2021.02构建根文件系统时，遇到因文件系统大小限制导致的编译错误。通过增大BR2_TARGET_ROOTFS_EXT2_SIZE配置选项至256M，成功解决了因加入OPENJDK导致的根文件系统超出指定镜像大小的问题。调整后，根文件系统创建完成，且镜像大小为256M。

平台

Ubuntu 16.04 + Buildroot-2021.02

问题

mkdir -p /home/anson/codes/buildroot-2021.02/output/images
rm -rf /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2
mkdir -p /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2
rsync -auH --exclude=/THIS_IS_NOT_YOUR_ROOT_FILESYSTEM /home/anson/codes/buildroot-2021.02/output/target/ /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/target
echo '#!/bin/sh' > /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
echo "set -e" >> /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
echo "chown -h -R 0:0 /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/target" >> /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
PATH="/home/anson/codes/buildroot-2021.02/output/host/bin:/home/anson/codes/buildroot-2021.02/output/host/sbin:/home/anson/bin:/home/anson/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" /home/anson/codes/buildroot-2021.02/support/scripts/mkusers /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/full_users_table.txt /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/target >> /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
echo "/home/anson/codes/buildroot-2021.02/output/host/bin/makedevs -d /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/full_devices_table.txt /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/target" >> /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
printf '   \n' >> /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
printf '   \n' >> /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
printf '   	rm -f /home/anson/codes/buildroot-2021.02/output/images/rootfs.ext2\n	/home/anson/codes/buildroot-2021.02/output/host/sbin/mkfs.ext2 -d /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/target -r 1 -N 0 -m 5 -L "rootfs" -O ^64bit /home/anson/codes/buildroot-2021.02/output/images/rootfs.ext2 "64M" || { ret=$?; echo "*** Maybe you need to increase the filesystem size (BR2_TARGET_ROOTFS_EXT2_SIZE)" 1>&2; exit $ret; }\n' >> /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
chmod a+x /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
PATH="/home/anson/codes/buildroot-2021.02/output/host/bin:/home/anson/codes/buildroot-2021.02/output/host/sbin:/home/anson/bin:/home/anson/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" FAKEROOTDONTTRYCHOWN=1 /home/anson/codes/buildroot-2021.02/output/host/bin/fakeroot -- /home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/fakeroot
rootdir=/home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/ext2/target
table='/home/anson/codes/buildroot-2021.02/output/build/buildroot-fs/full_devices_table.txt'
mke2fs 1.45.6 (20-Mar-2020)
Creating regular file /home/anson/codes/buildroot-2021.02/output/images/rootfs.ext2
Creating filesystem with 65536 1k blocks and 16384 inodes
Filesystem UUID: 7882b549-c37b-4741-9546-c893e7457164
Superblock backups stored on blocks: 
	8193, 24577, 40961, 57345

Allocating group tables: done                            
Writing inode tables: done                            
Copying files into the device: __populate_fs: Could not allocate block in ext2 filesystem while writing file "modules"
mkfs.ext2: Could not allocate block in ext2 filesystem while populating file system
*** Maybe you need to increase the filesystem size (BR2_TARGET_ROOTFS_EXT2_SIZE)
fs/ext2/ext2.mk:46: recipe for target '/home/anson/codes/buildroot-2021.02/output/images/rootfs.ext2' failed
make[1]: *** [/home/anson/codes/buildroot-2021.02/output/images/rootfs.ext2] Error 1
Makefile:84: recipe for target '_all' failed
make: *** [_all] Error 2

前面的编译过程没有的报错, 所以基本判断可以从Maybe you need to increase the filesystem size (BR2_TARGET_ROOTFS_EXT2_SIZE)

解决

查看当前配置(.config):

BR2_TARGET_ROOTFS_EXT2_SIZE="64M"

改为:

BR2_TARGET_ROOTFS_EXT2_SIZE="256M"

产生这个问题的原因是尝试加入了OPENJDK的环境导致系统文件增加(rootfs.ext2), 最终超出了指定的镜像文件大小.

修改后:

~/codes/buildroot-2021.02$ ls -lh output/images/
total 128M
-rw-r--r-- 1 anson anson 256M 7月  16 14:04 rootfs.ext2
-rwxr-xr-x 1 anson anson  477 7月  16 14:01 start-qemu.sh
-rwxr-xr-x 1 anson anson  14K 7月  16 12:03 vexpress-v2p-ca9.dtb
-rw-r--r-- 1 anson anson 4.7M 7月  16 12:03 zImage