Can not create volume inside overlayfs

[yaroslavkasatikov]

Hey team,

I tried to mount on the node merged overlayfs volume:

mount -t overlay overlay -o lowerdir=/tmp/fs/lower/,upperdir=/tmp/fs/upper/,workdir=/tmp/overlay /tmp/fs/merged/
And I want to set /tmp/fs/merged/ as DEFAULT_PATH_FOR_NON_LISTED_NODES
So I have changed it :

{
        "nodePathMap":[
        {
                "node":"DEFAULT_PATH_FOR_NON_LISTED_NODES",
                "paths":["/tmp/fs/merged/storage"]
        }
        ]
}

But when I created the pvc and pod, it seems that helper created the folder under the mounted overlayfs dir:

sh-5.2# ls -la /tmp/fs/merged/storage/
total 0
drwxrwxrwx. 2 root root 40 Oct 29 16:06 .
drwxrwxrwx. 1 root root 60 Oct 29 16:10 ..
sh-5.2# umount /tmp/fs/merged/
sh-5.2# ls -la /tmp/fs/merged/storage/
total 0
drwxr-xr-x. 3 root root 60 Oct 29 16:14 .
drwxr-xr-x. 3 root root 60 Oct 29 16:14 ..
drwxrwxrwx. 2 root root 40 Oct 29 16:14 pvc-7fa119e3-2224-4020-a78f-149ff4dd86ea_local-path-storage_local-path-pvc
sh-5.2#
I have trying it with OKD 4.14.

OS:

Fedora release 38 (Thirty Eight)
NAME="Fedora Linux"
VERSION="38.20231027.3.2 (CoreOS)"
ID=fedora
VERSION_ID=38
VERSION_CODENAME=""
PLATFORM_ID="platform:f38"
PRETTY_NAME="Fedora CoreOS 38.20231027.3.2"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:fedoraproject:fedora:38"
HOME_URL="https://getfedora.org/coreos/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora-coreos/"
SUPPORT_URL="https://github.com/coreos/fedora-coreos-tracker/"
BUG_REPORT_URL="https://github.com/coreos/fedora-coreos-tracker/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=38
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=38
SUPPORT_END=2024-05-14
VARIANT="CoreOS"
VARIANT_ID=coreos
OSTREE_VERSION='38.20231027.3.2'
Fedora release 38 (Thirty Eight)
Fedora release 38 (Thirty Eight)
cpe:/o:fedoraproject:fedora:38
Is it possible to create a volume inside overlayfs?