Re: [PATCH v6 06/20] liveupdate: luo_file: implement file systems callbacks

[David Matlack <dmatlack@google.com>]

On 2025-11-15 06:33 PM, Pasha Tatashin wrote:
> This patch implements the core mechanism for managing preserved
> files throughout the live update lifecycle. It provides the logic to
> invoke the file handler callbacks (preserve, unpreserve, freeze,
> unfreeze, retrieve, and finish) at the appropriate stages.
> 
> During the reboot phase, luo_file_freeze() serializes the final
> metadata for each file (handler compatible string, token, and data
> handle) into a memory region preserved by KHO. In the new kernel,
> luo_file_deserialize() reconstructs the in-memory file list from this
> data, preparing the session for retrieval.
> 
> Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>

> +int liveupdate_register_file_handler(struct liveupdate_file_handler *h);

Should there be a way to unregister a file handler?

If VFIO is built as module then I think it  would need to be able to
unregister its file handler when the module is unloaded to avoid leaking
pointers to its text in LUO.