Hướng dẫn Resize RootFS OpenWRT (Expand root) áp dụng cho ext4, squashfs

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cat << "EOF" > /etc/uci-defaults/70-rootpt-resize
if [ ! -e /etc/rootpt-resize ] \
&& type parted > /dev/null \
&& lock -n /var/lock/root-resize
then
ROOT_BLK="$(readlink -f /sys/dev/block/"$(awk -e \
'$9=="/dev/root"{print $3}' /proc/self/mountinfo)")"
ROOT_DISK="/dev/$(basename "${ROOT_BLK%/*}")"
ROOT_PART="${ROOT_BLK##*[^0-9]}"
parted -f -s "${ROOT_DISK}" \
resizepart "${ROOT_PART}" 100%
mount_root done
touch /etc/rootpt-resize
reboot
fi
exit 1
EOF
cat << "EOF" > /etc/uci-defaults/80-rootfs-resize
if [ ! -e /etc/rootfs-resize ] \
&& [ -e /etc/rootpt-resize ] \
&& type losetup > /dev/null \
&& type resize2fs > /dev/null \
&& lock -n /var/lock/root-resize
then
ROOT_BLK="$(readlink -f /sys/dev/block/"$(awk -e \
'$9=="/dev/root"{print $3}' /proc/self/mountinfo)")"
ROOT_DEV="/dev/${ROOT_BLK##*/}"
LOOP_DEV="$(awk -e '$5=="/overlay"{print $9}' \
/proc/self/mountinfo)"
if [ -z "${LOOP_DEV}" ]
then
LOOP_DEV="$(losetup -f)"
losetup "${LOOP_DEV}" "${ROOT_DEV}"
fi
resize2fs -f "${LOOP_DEV}"
mount_root done
touch /etc/rootfs-resize
reboot
fi
exit 1
EOF
cat << "EOF" >> /etc/sysupgrade.conf
/etc/uci-defaults/70-rootpt-resize
/etc/uci-defaults/80-rootfs-resize
EOF

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root@OpenWrt:~# parted
GNU Parted 3.4
Using /dev/mmcblk0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: SD LX32G (sd/mmc)
Disk /dev/mmcblk0: 31.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number  Start   End     Size    Type     File system  Flags
 1      33.6MB  50.3MB  16.8MB  primary  ext2         boot
 2      67.1MB  176MB   109MB   primary  ext2
(parted) resizepart 2 100%
Warning: Shrinking a partition can cause data loss, are you sure you want to continue? Yes/No? yes
(parted) print
Model: SD LX32G (sd/mmc)
Disk /dev/mmcblk0: 31.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number  Start    End     Size    Type     File system  Flags
 1      133.6MB  50.3MB  16.8MB  primary  ext2         boot      
 2      67.1MB   30.0GB  29.9GB  primary  ext2
(parted) quit
Information: You may need to update /etc/fstab.
root@OpenWrt:~#

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root@OpenWrt:~# mount -o remount,ro /
root@OpenWrt:~# tune2fs -O^resize_inode /dev/mmcblk0p2
tune2fs 1.47.0 (5-Feb-2023)
root@OpenWrt:~# fsck.ext4 /dev/mmcblk0p2
e2fsck 1.47.0 (5-Feb-2023)
rootfs contains a file system with errors, check forced.
Filesystem does not have resize_inode enabled, but s_reserved_gdt_blocks is 7; should be zero. Fix<y>? yes
Resize_inode not enabled, but the resize inode is non-zero. Clear<y>? yes
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences: -(2--8) -427
Fix<y>? yes
Free blocks count wrong for group #0 (15291, counted=15299).
Fix<y>? yes
Free blocks count wrong (15291, counted=15299).
Fix<y>? yes
Padding at end of inode bitmap is not set. Fix<y>? yes
rootfs: ***** FILE SYSTEM WAS MODIFIED *****
rootfs: ***** REBOOT SYSTEM *****
rootfs: 1513/6656 files (0.0% non-contiguous), 11325/26624 blocks
root@OpenWrt:~# reboot

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root@OpenWrt:~# resize2fs /dev/mmcblk0p2
resize2fs 1.47.0 (5-Feb-2023)
Filesystem at /dev/mmcblk0p2 is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 2
The filesystem on /dev/mmcblk0p2 is now 7307834 (4k) blocks long.

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root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 7.3G     14.5M     27.5G   0% /
tmpfs                   495.8M     68.0K    495.7M   0% /tmp
tmpfs                   512.0K         0    512.0K   0% /dev