linux-kernel - [RFC PATCH v4 32/36] WIP: fuse-bpf: add error

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Message-ID: <20240329015351.624249-33-drosen@google.com>
Date: Thu, 28 Mar 2024 18:53:47 -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>, 
	Eduard Zingerman <eddyz87@...il.com>, Yonghong Song <yonghong.song@...ux.dev>, 
	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>, 
	Christian Brauner <brauner@...nel.org>, kernel-team@...roid.com, 
	Daniel Rosenberg <drosen@...gle.com>
Subject: [RFC PATCH v4 32/36] 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 {
-- 
2.44.0.478.gd926399ef9-goog