From: Jiri Olsa <jolsa@redhat.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andriin@fb.com>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
Martin KaFai Lau <kafai@fb.com>, David Miller <davem@redhat.com>,
John Fastabend <john.fastabend@gmail.com>,
Wenbo Zhang <ethercflow@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Brendan Gregg <bgregg@netflix.com>,
Florent Revest <revest@chromium.org>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH v9 bpf-next 10/14] bpf: Add d_path helper
Date: Wed, 5 Aug 2020 23:01:01 +0200 [thread overview]
Message-ID: <20200805210101.GF319954@krava> (raw)
In-Reply-To: <20200805175850.GD319954@krava>
On Wed, Aug 05, 2020 at 07:58:54PM +0200, Jiri Olsa wrote:
> On Tue, Aug 04, 2020 at 11:35:53PM -0700, Andrii Nakryiko wrote:
> > On Sat, Aug 1, 2020 at 10:04 AM Jiri Olsa <jolsa@kernel.org> 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.
> > >
> > > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> > > ---
> > > include/uapi/linux/bpf.h | 13 +++++++++
> > > kernel/trace/bpf_trace.c | 48 ++++++++++++++++++++++++++++++++++
> > > scripts/bpf_helpers_doc.py | 2 ++
> > > tools/include/uapi/linux/bpf.h | 13 +++++++++
> > > 4 files changed, 76 insertions(+)
> > >
> > > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> > > index eb5e0c38eb2c..a356ea1357bf 100644
> > > --- a/include/uapi/linux/bpf.h
> > > +++ b/include/uapi/linux/bpf.h
> > > @@ -3389,6 +3389,18 @@ union bpf_attr {
> > > * A non-negative value equal to or less than *size* on success,
> > > * or a negative error in case of failure.
> > > *
> > > + * int bpf_d_path(struct path *path, char *buf, u32 sz)
> >
> > nit: probably would be good to do `const struct path *` here, even if
> > we don't do const-ification properly in all helpers.
hum, for this I need to update scripts/bpf_helpers_doc.py and it looks
like it's not ready for const struct yet:
CLNG-LLC [test_maps] get_cgroup_id_kern.o
In file included from progs/test_lwt_ip_encap.c:7:
In file included from /home/jolsa/linux/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:11:
/home/jolsa/linux/tools/testing/selftests/bpf/tools/include/bpf/bpf_helper_defs.h:32:1: warning: 'const' ignored on this declaration [-Wmissing-declarations]
const struct path;
^
would it be ok as a follow up change? I'll need to check
on bpf_helpers_doc.py script first
jirka
next prev parent reply other threads:[~2020-08-05 21:01 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-01 17:03 [PATCH v9 bpf-next 00/14] bpf: Add d_path helper Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 01/14] tools resolve_btfids: Add size check to get_id function Jiri Olsa
2020-08-05 6:00 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 02/14] tools resolve_btfids: Add support for set symbols Jiri Olsa
2020-08-05 6:04 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 03/14] bpf: Move btf_resolve_size into __btf_resolve_size Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 04/14] bpf: Add elem_id pointer as argument to __btf_resolve_size Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 05/14] bpf: Add type_id " Jiri Olsa
2020-08-05 6:05 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 06/14] bpf: Remove recursion call in btf_struct_access Jiri Olsa
2020-08-05 6:12 ` Andrii Nakryiko
2020-08-05 17:36 ` Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 07/14] bpf: Factor btf_struct_access function Jiri Olsa
2020-08-05 6:18 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 08/14] bpf: Add btf_struct_ids_match function Jiri Olsa
2020-08-05 6:27 ` Andrii Nakryiko
2020-08-05 17:56 ` Jiri Olsa
2020-08-05 21:31 ` Jiri Olsa
2020-08-05 21:57 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 09/14] bpf: Add BTF_SET_START/END macros Jiri Olsa
2020-08-05 6:29 ` Andrii Nakryiko
2020-08-01 17:03 ` [PATCH v9 bpf-next 10/14] bpf: Add d_path helper Jiri Olsa
2020-08-02 3:13 ` Alexei Starovoitov
2020-08-02 18:26 ` Jiri Olsa
2020-08-05 6:35 ` Andrii Nakryiko
2020-08-05 17:58 ` Jiri Olsa
2020-08-05 21:01 ` Jiri Olsa [this message]
2020-08-05 21:09 ` Andrii Nakryiko
2020-08-07 0:31 ` KP Singh
2020-08-07 8:35 ` Jiri Olsa
2020-08-07 9:42 ` KP Singh
2020-08-01 17:03 ` [PATCH v9 bpf-next 11/14] bpf: Update .BTF_ids section in btf.rst with sets info Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 12/14] selftests/bpf: Add verifier test for d_path helper Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 13/14] selftests/bpf: Add " Jiri Olsa
2020-08-05 6:40 ` Andrii Nakryiko
2020-08-05 18:00 ` Jiri Olsa
2020-08-01 17:03 ` [PATCH v9 bpf-next 14/14] selftests/bpf: Add set test to resolve_btfids Jiri Olsa
2020-08-05 6:41 ` Andrii Nakryiko
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