[kiwi] Problem with overlayfs and 3.18 kernel

Yaroslav Andrusyak

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Dec 4, 2014, 1:31:15 PM12/4/14

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Hi all.

Looks like overlayfs (fs name and module name) was renamed to overlay,

cat /proc/filesystems|grep overlay

nodev overlay

modinfo overlay

filename: /lib/modules/3.18.0-rc7-2-desktop/kernel/fs/overlayfs/overlay.ko

alias: fs-overlay

license: GPL

description: Overlay filesystem

author: Miklos Szeredi <mik...@szeredi.hu>

srcversion: 7B9E64FDD9543689D7E0606

depends:

intree: Y

vermagic: 3.18.0-rc7-2-desktop SMP preempt mod_unload modversions

and other problem is workdir(required) mount option.

mount -t overlay -o rw,lowerdir=/mnt/1,upperdir=/mnt/2 overlay /mnt/3

mount: wrong fs type, bad option, bad superblock on overlay,

missing codepage or helper program, or other error

In some cases useful info is found in syslog - try

dmesg | tail or so.

mount -t overlay -o rw,lowerdir=/mnt/1,upperdir=/mnt/2,workdir=/mnt/4 overlay /mnt/3

works fine

Marcus Schäfer

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Dec 5, 2014, 5:06:15 AM12/5/14

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Hi,

> Hi all.
> Looks like overlayfs (fs name and module name) was renamed to overlay,
> cat /proc/filesystems|grep overlay
> nodev overlay
> modinfo overlay
> filename:
> /lib/modules/3.18.0-rc7-2-desktop/kernel/fs/overlayfs/overlay.ko

Thanks much for letting us know, in kiwi we match the module
by <fs/overlayfs/*> so this will still match the renamed module

> and other problem is workdir(required) mount option.
> mount -t overlay -o rw,lowerdir=/mnt/1,upperdir=/mnt/2 overlay /mnt/3
>
> mount: wrong fs type, bad option, bad superblock on overlay,
>

> mount -t overlay -o rw,lowerdir=/mnt/1,upperdir=/mnt/2,workdir=/mnt/4
> overlay /mnt/3
> works fine

yes thanks I have updated the kiwi code to check for both variants
The commit is here:

commit 48333a6af8be419556bbec300fb28f572d49762d
Adapt changes in overlayfs in kernel 3.18

Would be great if you can double check

Thanks

Regards,
Marcus
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Yaroslav Andrusyak

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Dec 5, 2014, 7:23:20 AM12/5/14

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Does not work. I can not switch to other vt to see more info(dmesg, lsmod )

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Marcus Schäfer

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Dec 5, 2014, 8:39:54 AM12/5/14

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Hi,

> Does not work. I can not switch to other vt to see more info(dmesg,
> lsmod )

try to boot with

kiwidebug=1

that will give you a shell

Yaroslav Andrusyak

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Dec 5, 2014, 9:37:19 AM12/5/14

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14.308204] overlayfs: workdir and upperdir must reside under the same mount

looks like we need

upperdir=/read-write/rw

workdir=/read-write/work-dir

Marcus Schäfer

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Dec 5, 2014, 9:53:17 AM12/5/14

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Hi,

> 14.308204] overlayfs: workdir and upperdir must reside under the same
> mount
> looks like we need
> upperdir=/read-write/rw
> workdir=/read-write/work-dir

hmpf, ok follow up patch pushed to the git, let's see if it like it
that way

Thanks much for testing this

Yaroslav Andrusyak

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Dec 5, 2014, 10:24:15 AM12/5/14

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overlay say

upperdir and workdir must be in separate subtrees

Yaroslav Andrusyak

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Dec 7, 2014, 5:35:27 AM12/7/14

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now it works

\--- /home/download/git/kiwi/modules/KIWILinuxRC.sh 2014-12-05 17:05:35.029034489 +0200

+++ /usr/share/kiwi/modules/KIWILinuxRC.sh 2014-12-07 11:35:46.653382513 +0200

@@ -6133,6 +6133,7 @@

local roDir=/read-only

local rwDir=/read-write

local wkDir=$rwDir/work-stage

+ local upDir=$rwDir/rw

local rwDevice=`echo $UNIONFS_CONFIG | cut -d , -f 1`

local roDevice=`echo $UNIONFS_CONFIG | cut -d , -f 2`

local unionFST=`echo $UNIONFS_CONFIG | cut -d , -f 3`

@@ -6197,7 +6198,8 @@

local opts="rw,lowerdir=$roDir,upperdir=$rwDir"

if ! mount -t overlayfs -o $opts overlayfs /mnt;then

mkdir -p $wkDir

- opts="$opts,workdir=$wkDir"

+ mkdir -p $upDir

+ opts="rw,lowerdir=$roDir,upperdir=$upDir,workdir=$wkDir"

if ! mount -t overlay -o $opts overlay /mnt;then

Echo "Failed to mount root via overlayfs"

return 1

Marcus Schäfer

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Dec 7, 2014, 8:32:07 AM12/7/14

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Hi,

> overlay says

> upperdir and workdir must be in separate subtrees

yes, sorry forgot to take that into acount. you mentioned this
in your last mail. applied now

Regards,
Marcus
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Marcus Schäfer (Res. & Dev.) SUSE LINUX Products GmbH

Tel: 0911-740 53 0 Maxfeldstrasse 5
FAX: 0911-740 53 479 D-90409 Nürnberg
GF: Jeff Hawn,Jennifer Guild, Felix Imendörffer

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http://www.suse.de
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