linux-kernel - [RFC PATCH v3 34/37] WIP: fuse-bpf: add error

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Message-ID: <20230418014037.2412394-35-drosen@google.com>
Date:   Mon, 17 Apr 2023 18:40:34 -0700
From:   Daniel Rosenberg <drosen@...gle.com>
To:     Miklos Szeredi <miklos@...redi.hu>, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>
Cc:     Amir Goldstein <amir73il@...il.com>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-unionfs@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Joanne Koong <joannelkoong@...il.com>,
        Mykola Lysenko <mykolal@...com>, kernel-team@...roid.com,
        Daniel Rosenberg <drosen@...gle.com>
Subject: [RFC PATCH v3 34/37] WIP: fuse-bpf: add error_out

error_out field will allow differentiating between altering error code
from bpf programs, and the bpf program returning an error. TODO

Signed-off-by: Daniel Rosenberg <drosen@...gle.com>
---
 include/linux/bpf_fuse.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/bpf_fuse.h b/include/linux/bpf_fuse.h
index 159b850e1b46..15646ba59c41 100644
--- a/include/linux/bpf_fuse.h
+++ b/include/linux/bpf_fuse.h
@@ -57,6 +57,7 @@ struct bpf_fuse_meta_info {
 	uint64_t nodeid;
 	uint32_t opcode;
 	uint32_t error_in;
+	uint32_t error_out; // TODO: struct_op programs may set this to alter reported error code
 };
 
 struct bpf_fuse_args {
-- 
2.40.0.634.g4ca3ef3211-goog