linux-kernel - [RFC PATCH v4 01/36] fuse-bpf: Update fuse side uapi

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Message-ID: <20240329015351.624249-2-drosen@google.com>
Date: Thu, 28 Mar 2024 18:53:16 -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>, Paul Lawrence <paullawrence@...gle.com>
Subject: [RFC PATCH v4 01/36] fuse-bpf: Update fuse side uapi

Adds structures which will be used to inform fuse about what it is being
stacked on top of. Once filters are in place, error_in will inform the
post filter if the backing call returned an error.

Signed-off-by: Daniel Rosenberg <drosen@...gle.com>
Signed-off-by: Paul Lawrence <paullawrence@...gle.com>
---
 include/uapi/linux/fuse.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index e7418d15fe39..0c0a9a8b5c26 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -654,6 +654,29 @@ struct fuse_entry_out {
 	struct fuse_attr attr;
 };
 
+#define FUSE_BPF_MAX_ENTRIES	2
+
+enum fuse_bpf_type {
+	FUSE_ENTRY_BACKING		= 1,
+	FUSE_ENTRY_BPF			= 2,
+	FUSE_ENTRY_REMOVE_BACKING	= 3,
+	FUSE_ENTRY_REMOVE_BPF		= 4,
+};
+
+#define BPF_FUSE_NAME_MAX 15
+
+struct fuse_bpf_entry_out {
+	uint32_t	entry_type;
+	uint32_t	unused;
+	union {
+		struct {
+			uint64_t unused2;
+			uint64_t fd;
+		};
+		char name[BPF_FUSE_NAME_MAX + 1];
+	};
+};
+
 struct fuse_forget_in {
 	uint64_t	nlookup;
 };
-- 
2.44.0.478.gd926399ef9-goog