What is the problem you're trying to solve

We have some stateless pods that have heavy load on rootfs, and when overlayfs syncing happens, ovl_sync_fs is called, down_read lock is acquired, if there's lot of data to sync, process take too long, hungtask panic might happen.

relevant doc: https://www.redhat.com/sysadmin/container-volatile-overlay-mounts

Describe the solution you'd like

Add volatile option support when mounting overlayfs

Additional context

No response