netdev - Re: [PATCH v4 bpf-next 13/14] selftests/bpf: Add test for d

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Date:   Sun, 28 Jun 2020 21:55:33 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Wenbo Zhang <ethercflow@...il.com>,
        Networking <netdev@...r.kernel.org>, bpf <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>,
        KP Singh <kpsingh@...omium.org>,
        Andrii Nakryiko <andriin@...com>,
        Brendan Gregg <bgregg@...flix.com>,
        Florent Revest <revest@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v4 bpf-next 13/14] selftests/bpf: Add test for d_path
 helper

On Fri, Jun 26, 2020 at 02:55:34PM -0700, Andrii Nakryiko wrote:

SNIP

> > +       if (cnt_stat >= MAX_EVENT_NUM)
> > +               return 0;
> > +
> > +       bpf_d_path(path, paths_stat[cnt_stat], MAX_PATH_LEN);
> > +       cnt_stat++;
> > +       return 0;
> > +}
> > +
> > +SEC("fentry/filp_close")
> > +int BPF_PROG(prog_close, struct file *file, void *id)
> > +{
> > +       pid_t pid = bpf_get_current_pid_tgid() >> 32;
> > +
> > +       if (pid != my_pid)
> > +               return 0;
> > +
> > +       if (cnt_close >= MAX_EVENT_NUM)
> > +               return 0;
> > +
> > +       bpf_d_path((struct path *) &file->f_path,
> > +                  paths_close[cnt_close], MAX_PATH_LEN);
> 
> Can you please capture the return result of bpf_d_path() (here and
> above) and validate that it's correct? That will help avoid future
> breakages if anyone changes this.

right, good idea, will add

thanks,
jirka