[PATCH bpf-next 3/4] bpf: Introduce path iterator

[Al Viro]

On Wed, May 28, 2025 at 03:26:22PM -0700, Song Liu wrote:
> Introduce a path iterator, which reliably walk a struct path.

No, it does not.  If you have no external warranty that mount
*and* dentry trees are stable, it's not reliable at all.

And I'm extremely suspicious regarding the validity of anything
that pokes around in mount trees.  There is a very good reason
struct mount is *not* visible in include/linux/*.h