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

On Tue, May 28, 2024 at 03:28:18PM +0200, Miklos Szeredi wrote:

quoted

open_by_handle_at looks up the superblock based on that identifier.

The open file needs a specific mount, holding the superblock is not
sufficient.

A strut file needs a vfsmount, yes.  And it better be reachable by
the calling process.  And maybe an optional restriction to a specific
mount by the caller might be useful, but I can't see how it is
required.