Extroot config failed after reboot

Installing and Using OpenWrt
1

My router is x86 with cpu 3205U using last stable openwrt version OpenWrt 21.02.0 r16279-5cc0535800 . My overlay space will be full, so I want to extend my overlay space to install more packages.

I follow up the guide of wiki page Extroot configuration but failed.

my fstab

root@OpenWrt:~# cat /etc/config/fstab

config global
	option anon_swap '0'
	option anon_mount '0'
	option auto_swap '1'
	option auto_mount '1'
	option check_fs '0'
	option delay_root '20'

config mount
	option target '/overlay'
	option uuid 'fb7604f7-b620-4368-9a31-8e051c89b735'
	option enabled '0'

config mount
	option target '/boot'
	option uuid '84173db5-fa99-e35a-95c6-28613cc79ea9'
	option enabled '0'

config mount
	option target '/rom'
	option uuid 'ca2e4295-6c2e7e2a-db5d7a18-d19e4084'
	option enabled '0'

config mount 'rwm'
	option device '/dev/loop0'
	option target '/rwm'
	option enabled '1'

config mount 'overlay'
	option uuid '2130c1dd-4c49-4724-bd7e-dd15bf45fb40'
	option target '/overlay'
	option enabled '1'

Block info

root@OpenWrt:~# block info
/dev/loop0: UUID="fb7604f7-b620-4368-9a31-8e051c89b735" LABEL="rootfs_data" VERSION="1.14" MOUNT="/overlay" TYPE="f2fs"
/dev/sda1: UUID="84173db5-fa99-e35a-95c6-28613cc79ea9" LABEL="kernel" VERSION="1.0" MOUNT="/boot" TYPE="ext4"
/dev/sda2: UUID="ca2e4295-6c2e7e2a-db5d7a18-d19e4084" VERSION="4.0" MOUNT="/rom" TYPE="squashfs"
/dev/sda3: UUID="2130c1dd-4c49-4724-bd7e-dd15bf45fb40" VERSION="1.0" TYPE="ext4"

df:

root@OpenWrt:~# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root                 4096      4096         0 100% /rom
tmpfs                  1975644       508   1975136   0% /tmp
/dev/loop0              100416     92776      7640  92% /overlay
overlayfs:/overlay      100416     92776      7640  92% /
/dev/sda1                16112      4876     10912  31% /boot
/dev/sda1                16112      4876     10912  31% /boot
tmpfs                      512         0       512   0% /dev

I also follow up the troubleshooting method

uci set fstab.@global[0].delay_root="15"

uci set about fstab

root@OpenWrt:~# uci show | grep fsta
fstab.@global[0]=global
fstab.@global[0].anon_swap='0'
fstab.@global[0].anon_mount='0'
fstab.@global[0].auto_swap='1'
fstab.@global[0].auto_mount='1'
fstab.@global[0].check_fs='0'
fstab.@global[0].delay_root='20'
fstab.@mount[0]=mount
fstab.@mount[0].target='/overlay'
fstab.@mount[0].uuid='fb7604f7-b620-4368-9a31-8e051c89b735'
fstab.@mount[0].enabled='0'
fstab.@mount[1]=mount
fstab.@mount[1].target='/boot'
fstab.@mount[1].uuid='84173db5-fa99-e35a-95c6-28613cc79ea9'
fstab.@mount[1].enabled='0'
fstab.@mount[2]=mount
fstab.@mount[2].target='/rom'
fstab.@mount[2].uuid='ca2e4295-6c2e7e2a-db5d7a18-d19e4084'
fstab.@mount[2].enabled='0'
fstab.rwm=mount
fstab.rwm.device='/dev/loop0'
fstab.rwm.target='/rwm'
fstab.rwm.enabled='1'
fstab.overlay=mount
fstab.overlay.uuid='2130c1dd-4c49-4724-bd7e-dd15bf45fb40'
fstab.overlay.target='/overlay'
fstab.overlay.enabled='1'
ucitrack.@fstab[0]=fstab
ucitrack.@fstab[0].exec='/sbin/block mount'

start log about fs

root@OpenWrt:~# logread | grep fs
Tue Feb 15 03:52:12 2022 kern.info kernel: [    2.538673] squashfs: version 4.0 (2009/01/31) Phillip Lougher
Tue Feb 15 03:52:12 2022 kern.info kernel: [    3.250431] VFS: Mounted root (squashfs filesystem) readonly on device 8:2.
Tue Feb 15 03:52:12 2022 kern.notice kernel: [    6.979824] F2FS-fs (loop0): Mounted with checkpoint version = 5a9dd90d
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.117680] block: attempting to load /etc/config/fstab
Tue Feb 15 03:52:12 2022 user.err kernel: [    7.123115] block: unable to load configuration (fstab: Entry not found)
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.135146] mount_root: switching to f2fs overlay
Tue Feb 15 03:52:12 2022 kern.info kernel: [    7.140525] overlayfs: "xino" feature enabled using 32 upper inode bits.
Tue Feb 15 03:52:12 2022 kern.warn kernel: [    7.187326] EXT4-fs (sda1): warning: mounting unchecked fs, running e2fsck is recommended
Tue Feb 15 03:52:12 2022 kern.info kernel: [    7.200615] EXT4-fs (sda1): mounted filesystem without journal. Opts: (null)
Tue Feb 15 03:52:13 2022 user.notice ucitrack: Setting up non-init /etc/config/fstab reload handler: /sbin/block mount

preinit log:

root@OpenWrt:~# logread | sed -n -e "/- preinit -/,/- init -/p"
Tue Feb 15 03:52:12 2022 user.info kernel: [    3.598269] init: - preinit -
Tue Feb 15 03:52:12 2022 kern.notice kernel: [    3.753949] random: jshn: uninitialized urandom read (4 bytes read)
Tue Feb 15 03:52:12 2022 kern.notice kernel: [    3.766732] random: jshn: uninitialized urandom read (4 bytes read)
Tue Feb 15 03:52:12 2022 kern.notice kernel: [    3.775747] random: jshn: uninitialized urandom read (4 bytes read)
Tue Feb 15 03:52:12 2022 kern.warn kernel: [    6.830257] urandom_read: 4 callbacks suppressed
Tue Feb 15 03:52:12 2022 kern.notice kernel: [    6.830259] random: jshn: uninitialized urandom read (4 bytes read)
Tue Feb 15 03:52:12 2022 kern.notice kernel: [    6.863468] random: procd: uninitialized urandom read (4 bytes read)
Tue Feb 15 03:52:12 2022 kern.notice kernel: [    6.979824] F2FS-fs (loop0): Mounted with checkpoint version = 5a9dd90d
Tue Feb 15 03:52:12 2022 user.info kernel: [    6.989350] mount_root: loading kmods from internal overlay
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.040761] kmodloader: loading kernel modules from /tmp/overlay/upper/etc/modules-boot.d/*
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.049544] kmodloader: done loading kernel modules from /tmp/overlay/upper/etc/modules-boot.d/*
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.117680] block: attempting to load /etc/config/fstab
Tue Feb 15 03:52:12 2022 user.err kernel: [    7.123115] block: unable to load configuration (fstab: Entry not found)
Tue Feb 15 03:52:12 2022 user.err kernel: [    7.130018] block: no usable configuration
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.135146] mount_root: switching to f2fs overlay
Tue Feb 15 03:52:12 2022 kern.info kernel: [    7.140525] overlayfs: "xino" feature enabled using 32 upper inode bits.
Tue Feb 15 03:52:12 2022 kern.warn kernel: [    7.187326] EXT4-fs (sda1): warning: mounting unchecked fs, running e2fsck is recommended
Tue Feb 15 03:52:12 2022 kern.info kernel: [    7.200615] EXT4-fs (sda1): mounted filesystem without journal. Opts: (null)
Tue Feb 15 03:52:12 2022 user.warn kernel: [    7.211518] urandom-seed: Seeding with /etc/urandom.seed
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.236151] procd: - early -
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.762489] procd: - ubus -
Tue Feb 15 03:52:12 2022 kern.notice kernel: [    7.772452] random: ubusd: uninitialized urandom read (4 bytes read)
Tue Feb 15 03:52:12 2022 user.info kernel: [    7.820267] procd: - init -
2

What are you booting from?

On a non flash device, you usually just resize the partition and file system, instead of messing around with exroot...

BTW, 21.02.1 is the latest stable.

3

Thanks for the response.BTW I missing the latest version21.02.1:)
My device booting from /dev/sda1 non flash device.

fdisk info

root@OpenWrt:~# fdisk -l
Disk /dev/loop0: 100.06 MiB, 104923136 bytes, 204928 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


Disk /dev/sda: 14.75 GiB, 15837691904 bytes, 30932992 sectors
Disk model: BR 16G
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: dos
Disk identifier: 0xd0f061a8

Device     Boot  Start      End  Sectors  Size Id Type
/dev/sda1  *       512    33279    32768   16M 83 Linux
/dev/sda2        33792   246783   212992  104M 83 Linux
/dev/sda3       247808 30932991 30685184 14.6G 83 Linux

from the df info above the /overlay size is total: 100416(98m) while /sda/sda2 is 104M?

so what need i to do to extends the overlay size, resize the /dev/sda2 partition?

Thanks.

4

100M overlay is the default size.

You need to shrink the sda3 first, so sda2 can be extended,
or delete sda3, extend sda2, and recreate sda3.

https://gparted.org/livecd.php can do most of the job for you, except resizing the
squashfs, it doesn't seem to support it.
https://openwrt.org/docs/guide-user/installation/installation_methods/sd_card
Expanding the squashfs file system

or just start from scratch, it'll happen if you upgrade to 21.02.1 anyway.
I'd move from squashfs to ext4, if you're considering a reinstall.

5

If I can delete sd3(14.6G) and resize sda2 to make it large?

Does overlay mount on /dev/sda2? right?

If I am not considering a reinstall, how can I make overlay size large than 100m to install more package ?

If there is no method to extends the overlay size, I will considering a reinstall.

Thanks.

6

yes

yes

as in the link provided.

7

After My resize the /dev/sda2 size , the overlay size will extend to the new size large than 100m right?
This method will allow me extends the overlay size instead of reinstall right?

8

yes, it will.

9

Sad, : '(, it does not works for me.
I have extends the /dev/sda2 size to 5 GB, but overlay size is still 98M

the new df

root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 4.0M      4.0M         0 100% /rom
tmpfs                     1.9G     92.0K      1.9G   0% /tmp
/dev/loop0               98.1M     91.6M      6.5M  93% /overlay
overlayfs:/overlay       98.1M     91.6M      6.5M  93% /
/dev/sda1                15.7M      4.8M     10.7M  31% /boot
/dev/sda1                15.7M      4.8M     10.7M  31% /boot
tmpfs                   512.0K         0    512.0K   0% /dev

the new fdisk info

root@OpenWrt:~# fdisk -l
Disk /dev/loop0: 5 GiB, 5364580352 bytes, 10477696 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


Disk /dev/sda: 14.75 GiB, 15837691904 bytes, 30932992 sectors
Disk model: BR 16G
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: dos
Disk identifier: 0xd0f061a8

Device     Boot Start      End  Sectors Size Id Type
/dev/sda1  *      512    33279    32768  16M 83 Linux
/dev/sda2       33792 10519551 10485760   5G 83 Linux
10

I'm no squashfs expert (one of the reasons why I avoid it :wink: ),
but did you resize the FS afterwards ?

you could try this instead, it's from one of the two threads posted earlier

11

Oh, It works for me, just forget resize the FS.
Thanks so much!
This problem has troubled me for a long
Thanks again for the kindly response! :wink:

12

FYI,

if you upgrade, the partition will shrink again.

This might be a better upgrade path for you, but it assumes you're using ext4 not squashfs.