linux-kernel - Re: [PATCH v4 bpf-next 3/5] bpf: Introduce path iterator

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Message-ID: <CAEf4Bzbmed8PVCb=1BVxgi2XoEmdoDOD276kTbbKOwwqXhv+Jg@mail.gmail.com>
Date: Thu, 12 Jun 2025 16:11:22 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Song Liu <song@...nel.org>
Cc: bpf@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org, 
	kernel-team@...a.com, andrii@...nel.org, eddyz87@...il.com, ast@...nel.org, 
	daniel@...earbox.net, martin.lau@...ux.dev, viro@...iv.linux.org.uk, 
	brauner@...nel.org, jack@...e.cz, kpsingh@...nel.org, 
	mattbobrowski@...gle.com, amir73il@...il.com, repnop@...gle.com, 
	jlayton@...nel.org, josef@...icpanda.com, mic@...ikod.net, gnoack@...gle.com, 
	m@...wtm.org, neil@...wn.name
Subject: Re: [PATCH v4 bpf-next 3/5] bpf: Introduce path iterator

On Wed, Jun 11, 2025 at 3:02 PM Song Liu <song@...nel.org> wrote:
>
> Introduce a path iterator, which walks a struct path toward the root.
> This path iterator is based on path_walk_parent. A fixed zero'ed root
> is passed to path_walk_parent(). Therefore, unless the user terminates
> it earlier, the iterator will terminate at the real root.
>
> Signed-off-by: Song Liu <song@...nel.org>
> ---
>  fs/bpf_fs_kfuncs.c    | 72 +++++++++++++++++++++++++++++++++++++++++++
>  kernel/bpf/verifier.c |  5 +++
>  2 files changed, 77 insertions(+)
>

LGTM from BPF and open-coded contract POV.

Acked-by: Andrii Nakryiko <andrii@...nel.org>

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