netdev - Re: [PATCH v2 bpf-next 2/4] bpf: allow bpf_d_path in sleepable bpf

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Message-ID: <fe6aca5b-9af8-a10a-96c1-79f4604aed4e@fb.com>
Date:   Wed, 16 Dec 2020 09:41:28 -0800
From:   Yonghong Song <yhs@...com>
To:     Song Liu <songliubraving@...com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <john.fastabend@...il.com>, <kpsingh@...omium.org>,
        <kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 2/4] bpf: allow bpf_d_path in sleepable
 bpf_iter program



On 12/15/20 3:37 PM, Song Liu wrote:
> task_file and task_vma iter programs have access to file->f_path. Enable
> bpf_d_path to print paths of these file.
> 
> bpf_iter programs are generally called in sleepable context. However, it
> is still necessary to diffientiate sleepable and non-sleepable bpf_iter
> programs: sleepable programs have access to bpf_d_path; non-sleepable
> programs have access to bpf_spin_lock.
> 
> Signed-off-by: Song Liu <songliubraving@...com>

Agreed. So far bpf_iter programs all called from process context.

Acked-by: Yonghong Song <yhs@...com>