[RFC PATCH bpf-next 02/12] namei: add vfs_walk_ancestors()

[sashiko-bot at kernel.org]

> Add a callback-based walk over a path and its ancestors, built on
> __path_walk_parent(): the kernel owns the loop and the callback must
> not sleep, so an rcu-walk engine can be added later without changing
> the API.
> 
> Disconnected root dentries are reported to the callback instead of
> terminating the walk; continuing over one resumes at the root of its
> mount.  A disconnected mountpoint landed on by a mount crossing - the
> one position this walk visits that a dget_parent()/follow_up() loop
> never does - is additionally flagged VFS_WALK_POS_MOUNTPOINT, so
> security callers can reproduce their pre-conversion evaluation
> sequence exactly.
> 
> Suggested-by: NeilBrown <neil at brown.name>
> Suggested-by: Christian Brauner <brauner at kernel.org>
> Signed-off-by: Justin Suess <utilityemal77 at gmail.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20261006002020.2890858-1-utilityemal77@gmail.com?part=2