Re: [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2)

[Christoph Hellwig]

On Thu, May 23, 2024 at 01:57:32PM -0700, Aleksa Sarai wrote:
> Now that we provide a unique 64-bit mount ID interface in statx, we can
> now provide a race-free way for name_to_handle_at(2) to provide a file
> handle and corresponding mount without needing to worry about racing
> with /proc/mountinfo parsing.

file handles are not tied to mounts, they are tied to super_blocks,
and they can survive reboots or (less relevant) remounts.  This thus
seems like a very confusing if not wrong interfaces.