On Wed, 8 Jul 2026 at 16:32, Giuseppe Scrivano [off-list ref] wrote:

Amir suggested to add that functionality when I've asked for some
feedback before sending the patch here.  I am fine to drop it if this is
the consensus although I see its utility from user space.

How about a completely different interface:

int get_fd_opt(const char *name, unsigned int index, unsigned int flags);

Enumerating layers would be as easy as passing an index stating from
zero and stopping when -ERANGE is received.

It would work for all filesystems that use files as options.  No more
fs specific ioctls.

Thanks,
Miklos