Re: [PATCH v9 05/10] namei: O_BENEATH-style path resolution flags

[Al Viro]

On Fri, Jul 12, 2019 at 02:25:53PM +0100, Al Viro wrote:

>       if (flags & LOOKUP_BENEATH) {
>               nd->root = nd->path;
>               if (!(flags & LOOKUP_RCU))
>                       path_get(&nd->root);
>               else
>                       nd->root_seq = nd->seq;

BTW, this assignment is needed for LOOKUP_RCU case.  Without it
you are pretty much guaranteed that lazy pathwalk will fail,
when it comes to complete_walk().

Speaking of which, what would happen if LOOKUP_ROOT/LOOKUP_BENEATH
combination would someday get passed?