RISC-V Linux rootfs 根文件系统扩容

RISC-V Linux rootfs 根文件系统扩容

flyfish

在制作根文件系统之后，该文件大小可能不到1G。在烧写的时候磁盘或者SD卡的剩余空间都分配到该分区。
方法：
根文件系统大小不变，还是不到1G。在buildroot时，将rootfs所在分区的大小设置大一些，这里是10G,在系统启动后再调整下。

步骤：
设置根文件系统的大小
不需要很大

BR2_TARGET_ROOTFS_EXT2_4=y
BR2_TARGET_ROOTFS_EXT2_GEN=4
BR2_TARGET_ROOTFS_EXT2_REV=1
BR2_TARGET_ROOTFS_EXT2_LABEL="rootfs"
BR2_TARGET_ROOTFS_EXT2_SIZE="1G"
BR2_TARGET_ROOTFS_EXT2_INODES=0
BR2_TARGET_ROOTFS_EXT2_RESBLKS=5
BR2_TARGET_ROOTFS_EXT2_MKFS_OPTIONS="-O ^64bit"
BR2_TARGET_ROOTFS_EXT2_NONE=y

设置 rootfs所在分区的大小
这里是10G

image sdcard.img {
	hdimage{
		gpt = true
		gpt-location = 1M
	}
	partition boot0 {
		in-partition-table = "no"
		image = "boot0_sdcard.fex"
		offset = 8K
	}
	partition boot-packages {
		in-partition-table = "no"
		image = "boot_package.fex"
		offset = 16400K
	}
	partition env {
		image = "env.fex"
		size = 128k
	}
	partition env-redund {
		image = "env.fex"
		size = 128k
	}
	partition boot {
		partition-type = 0xC
		bootable = "true"
		image = "boot.vfat"
	}
	partition rootfs {
		partition-type = 0x83
		image = "rootfs_ubuntu_riscv.ext4"
		size = 10G
	}
}

image boot.vfat {
	vfat {
	files = {
		"boot.img",
		"Image",
		"board.dtb"
	}
	}
	size = 32M
}

查看rootfs所在分区大小
是10G

sudo fdisk -l

Disk /dev/mmcblk0: 14.84 GiB, 15931539456 bytes, 31116288 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt

Device          Start      End  Sectors  Size Type
/dev/mmcblk0p1  34784    35039      256  128K Linux filesystem
/dev/mmcblk0p2  35040    35295      256  128K Linux filesystem
/dev/mmcblk0p3  35296   100831    65536   32M Linux filesystem
/dev/mmcblk0p4 100832 21072351 20971520   10G Linux filesystem

查看 /dev/root 实际大小 1008M

df -h

Filesystem      Size  Used Avail Use% Mounted on
/dev/root      1008M  842M  116M  88% /
tmpfs           244M     0  244M   0% /dev/shm
tmpfs            98M  3.0M   95M   4% /run
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs            49M     0   49M   0% /run/user/1000

开始扩容

sudo resize2fs /dev/mmcblk0p4

resize2fs 1.46.5 (30-Dec-2021)
Filesystem at /dev/mmcblk0p4 is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/mmcblk0p4 is now 2621440 (4k) blocks long.

扩容结果 /dev/root 实际大小由 1008M 变为 9.9G

df -h

Filesystem      Size  Used Avail Use% Mounted on
/dev/root       9.9G  843M  8.7G   9% /
tmpfs           244M     0  244M   0% /dev/shm
tmpfs            98M  3.0M   95M   4% /run
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs            49M     0   49M   0% /run/user/1000