linux-kernel - Re: [PATCH bpf-next v9 1/5] bpf: Introduce task

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Message-ID: <CAADnVQ+i25D9VVrL=Hst0x9GFz_-8i5U-TV3yLtqEFRzhYfmGA@mail.gmail.com>
Date: Wed, 29 Jan 2025 18:35:12 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Juntong Deng <juntong.deng@...look.com>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	John Fastabend <john.fastabend@...il.com>, Andrii Nakryiko <andrii@...nel.org>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, Eddy Z <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, 
	Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	Kumar Kartikeya Dwivedi <memxor@...il.com>, snorcht@...il.com, 
	Christian Brauner <brauner@...nel.org>, bpf <bpf@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, 
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v9 1/5] bpf: Introduce task_file open-coded
 iterator kfuncs

On Mon, Jan 27, 2025 at 3:48 PM Juntong Deng <juntong.deng@...look.com> wrote:
>
> This patch adds the open-coded iterator style process file iterator
> kfuncs bpf_iter_task_file_{new,next,destroy} that iterates over all
> files opened by the specified process.
>
> bpf_iter_task_file_next returns a pointer to bpf_iter_task_file_item,
> which currently contains *task, *file, fd. This is an extensible
> structure that enables compatibility with different versions
> through CO-RE.
>
> The reference to struct file acquired by the previous
> bpf_iter_task_file_next() is released in the next
> bpf_iter_task_file_next(), and the last reference is released in the
> last bpf_iter_task_file_next() that returns NULL.
>
> In the bpf_iter_task_file_destroy(), if the iterator does not iterate to
> the end, then the last struct file reference is released at this time.
>
> Signed-off-by: Juntong Deng <juntong.deng@...look.com>

All patches look fine,
but we need an ack from Christian for patches 3 and 4 to proceed.