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