FUSE Passthrough?

Linux 6.9 introduced FUSE passthrough, which will allow better performance for fuse-based filesystems. https://source.android.com/docs/core/storage/fuse-passthrough


I don't know if there is work that needs to be done on the fuse-overlayfs side to utliize it, but seeing the android documentation, it seems to be a yes.

> When the FUSE daemon receives a request to open a file, it decides whether FUSE passthrough should be available for that particular file. If it's available, the daemon:
> - Notifies the FUSE driver about this request.
> - Enables FUSE passthrough for the file using the `FUSE_DEV_IOC_PASSTHROUGH_OPEN` ioctl, which must be performed on the file descriptor of the opened `/dev/fuse`.

Start by reviewing the linked Android FUSE passthrough documentation and the current fuse-overlayfs implementation to determine whether passthrough changes are required. Done would mean identifying the required integration and implementing it with verification, but this issue names no files, tests, or entry points.

Written by the indexing model from the issue text.