From: sashiko-bot@kernel.org
To: "Justin Suess" <utilityemal77@gmail.com>
Cc: bpf@vger.kernel.org, linux-security-module@vger.kernel.org
Subject: Re: [RFC PATCH bpf-next 12/12] selftests/bpf: exercise the lockless path ancestor iterator
Date: Tue, 06 Oct 2026 00:25:35 +0000 [thread overview]
Message-ID: <20261006002536.60E3E1F000FF@smtp.kernel.org> (raw)
In-Reply-To: <20261006002020.2890858-13-utilityemal77@gmail.com>
> Walk the same ancestry four ways and require the position counts to
> agree: lockless from a non-sleepable program, where the RCU critical
> section is implicit; lockless under an explicit bpf_rcu_read_lock();
> referenced; and the hybrid that walks lockless to the second position,
> hands it over to a referenced iteration, and resumes there - the
> escalated position therefore being walked twice, once per mode.
>
> The sleepable work the escalation exists for (d_path, an xattr read
> through the position's dentry) runs on the resumed iteration's first
> position, after bpf_rcu_read_unlock(), which is the only place a
> sleepable kfunc can run at all.
>
> Signed-off-by: Justin Suess <utilityemal77@gmail.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261006002020.2890858-1-utilityemal77@gmail.com?part=12
next prev parent reply other threads:[~2026-10-06 0:25 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-06 0:20 [RFC PATCH bpf-next 00/12] fs: unified VFS ancestor walk for Landlock and BPF Justin Suess
2026-10-06 0:20 ` [RFC PATCH bpf-next 01/12] namei: introduce __path_walk_parent() Justin Suess
2026-10-06 0:27 ` sashiko-bot
2026-10-06 0:20 ` [RFC PATCH bpf-next 02/12] namei: add vfs_walk_ancestors() Justin Suess
2026-10-06 0:30 ` sashiko-bot
2026-10-06 0:20 ` [RFC PATCH bpf-next 03/12] landlock: convert ancestor walk to vfs_walk_ancestors() Justin Suess
2026-10-06 0:27 ` sashiko-bot
2026-10-06 1:10 ` bot+bpf-ci
2026-10-06 0:20 ` [RFC PATCH bpf-next 04/12] bpf: mark struct path trusted Justin Suess
2026-10-06 0:34 ` sashiko-bot
2026-10-06 1:10 ` bot+bpf-ci
2026-10-06 0:20 ` [RFC PATCH bpf-next 05/12] namei: make vfs_walk_ancestors() stepwise Justin Suess
2026-10-06 0:30 ` sashiko-bot
2026-10-06 0:20 ` [RFC PATCH bpf-next 06/12] bpf: add a path ancestor iterator Justin Suess
2026-10-06 0:30 ` sashiko-bot
2026-10-06 1:11 ` bot+bpf-ci
2026-10-06 0:20 ` [RFC PATCH bpf-next 07/12] selftests/bpf: exercise the " Justin Suess
2026-10-06 0:28 ` sashiko-bot
2026-10-06 1:10 ` bot+bpf-ci
2026-10-06 0:20 ` [RFC PATCH bpf-next 08/12] fs: add mnt_undo_legitimize() Justin Suess
2026-10-06 0:28 ` sashiko-bot
2026-10-06 0:20 ` [RFC PATCH bpf-next 09/12] namei: add an rcu-walk mode to the ancestor walk Justin Suess
2026-10-06 0:33 ` sashiko-bot
2026-10-06 1:10 ` bot+bpf-ci
2026-10-06 0:20 ` [RFC PATCH bpf-next 10/12] bpf: support "__uninit" iterator arguments in generic kfuncs Justin Suess
2026-10-06 0:37 ` sashiko-bot
2026-10-06 14:58 ` Justin Suess
2026-10-06 0:20 ` [RFC PATCH bpf-next 11/12] bpf: add a lockless path ancestor iterator Justin Suess
2026-10-06 0:31 ` sashiko-bot
2026-10-06 1:10 ` bot+bpf-ci
2026-10-06 14:44 ` Justin Suess
2026-10-06 0:20 ` [RFC PATCH bpf-next 12/12] selftests/bpf: exercise the " Justin Suess
2026-10-06 0:25 ` sashiko-bot [this message]
2026-10-06 1:10 ` bot+bpf-ci
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