ImageBuilder - How to create an image with a custom filesystem

SiNONiMiTY · January 10, 2022, 11:09am

I think I found an answer, will test this and see if it works. This looks like it is undocumented on the ImageBuilder page.

Solution #1 - Change the partition size on the flashable image

Solution #2 - Online filesystem resizing (See comment #3 by Mario Tremblay commented on 10.03.2021 19:46)

github.com/openwrt/openwrt

FS#2951 - x86_64 ext4 generic: online resizing of root partition fails

opened 01:30PM - 31 Mar 20 UTC

openwrt-bot

flyspray

*jneuhauser:* **Used HW/SW:** - PCEngines APU2C4 - OpenWrt SNAPSHOT, r127…76-437eb41f23 **Steps to reproduce:** - Install needed packages: <code>root@OpenWrt:~# opkg update && opkg install fdisk resize2fs</code> - Extend root partition from 104 MB to 256 MB with fdisk: <code>root@OpenWrt:~# fdisk /dev/mmcblk0 << EOF p d 2 n p 2 33792 +256M w EOF</code> - Extend ext4 filesystem: <code>root@OpenWrt:~# resize2fs /dev/mmcblk0p2</code> **Here are the output of resize2fs:** <code>root@OpenWrt:~# resize2fs /dev/mmcblk0p2 resize2fs 1.45.4 (23-Sep-2019) Filesystem at /dev/mmcblk0p2 is mounted on /; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/mmcblk0p2 to 65664 (4k) blocks. resize2fs: Invalid argument While trying to add group #1</code> **Here are the dmesg output:** <code>root@OpenWrt:~# dmesg | tail -n 6 [50698.949591] EXT4-fs (mmcblk0p2): resizing filesystem from 32768 to 65664 blocks [50698.957030] EXT4-fs (mmcblk0p2): resizing filesystem from 32768 to 65536 blocks [50698.969299] EXT4-fs warning (device mmcblk0p2): reserve_backup_gdb:1033: reserved block 8 not at offset 7 [50698.978959] EXT4-fs warning (device mmcblk0p2): ext4_resize_fs:2120: error (-22) occurred during file system resize [50698.989429] EXT4-fs (mmcblk0p2): resized filesystem to 32768 [50698.999227] EXT4-fs warning (device mmcblk0p2): reserve_backup_gdb:1033: reserved block 8 not at offset 7</code> Offline resizing does work as expected.