Arch Linux

Description:
As of the 5.11 kernel there is support for rootless overlay support rendering fuse-overlayfs unnecessary.
Prior to the 5.11 kernel, fuse-overlayfs is still required.
This kernel support should increase container storage performance, and is desirable to the user.

Additional info:
https://www.redhat.com/sysadmin/podman-rootless-overlay

Steps to reproduce:

If you have an existing rootless podman install working (with fuse-overlayfs):
$ podman info --format json | jq . | grep -i overlay
"graphDriverName": "overlay",
"overlay.mount_program": {
"Executable": "/usr/bin/fuse-overlayfs",
"Package": "/usr/bin/fuse-overlayfs is owned by fuse-overlayfs 1.5.0-1",
"Version": "fusermount3 version: 3.10.4\nfuse-overlayfs: version 1.5\nFUSE library version 3.10.4\nusing FUSE kernel interface version 7.31"
"overlay.mountopt": "nodev"
"Native Overlay Diff": "false",

With fuse-overlayfs the user container storage directory will also have a file present by default in:
$HOME/.local/share/containers/storage/overlay/.has-mount-program

Finally there will be no `overlay` kernel module loaded:
$ lsmod | grep overlay
(nothing)

To convert to kernel based user overlay support run:
`podman system reset`

Note: this will delete ALL user container storage!


After `podman system reset` or on a fresh install (no fuse-overlayfs):
$ podman info --format json | jq . | grep -i overlay
"graphDriverName": "overlay",
"Native Overlay Diff": "false",

$ stat $HOME/.local/share/containers/storage/overlay/.has-mount-program
stat: cannot statx '/home/user/.local/share/containers/storage/overlay/.has-mount-program': No such file or directory

$ lsmod | grep overlay
overlay 147456 0