netdev - Re: [RFC PATCH v11 bpf-next 10/14] bpf: Add d

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Date:   Tue, 18 Aug 2020 02:14:44 +0200
From:   KP Singh <kpsingh@...omium.org>
To:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Wenbo Zhang <ethercflow@...il.com>,
        Brendan Gregg <bgregg@...flix.com>,
        Florent Revest <revest@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC PATCH v11 bpf-next 10/14] bpf: Add d_path helper



On 09.08.20 17:02, Jiri Olsa wrote:
> Adding d_path helper function that returns full path for
> given 'struct path' object, which needs to be the kernel
> BTF 'path' object. The path is returned in buffer provided
> 'buf' of size 'sz' and is zero terminated.
> 
>   bpf_d_path(&file->f_path, buf, size);
> 
> The helper calls directly d_path function, so there's only
> limited set of function it can be called from. Adding just
> very modest set for the start.
> 
> Updating also bpf.h tools uapi header and adding 'path' to
> bpf_helpers_doc.py script.
> 
> Acked-by: Andrii Nakryiko <andriin@...com>

Acked-by: KP Singh <kpsingh@...gle.com>

Thank you so much for working on this! 

> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---

[...]

>  /* integer value in 'imm' field of BPF_CALL instruction selects which helper
>