[PATCH v2 1/4] SUNRPC: Add a /sys/kernel/debug/fail_sunrpc/ directory

Chuck Lever
2021-08-10T21:06:03Z

This directory will contain a set of administrative controls for
enabling error injection for kernel RPC consumers.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
net/sunrpc/debugfs.c | 23 +++++++++++++++++++++++
net/sunrpc/fail.h | 21 +++++++++++++++++++++
2 files changed, 44 insertions(+)
create mode 100644 net/sunrpc/fail.h

diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
index 56029e3af6ff..dd9cf4cbda75 100644
--- a/net/sunrpc/debugfs.c
+++ b/net/sunrpc/debugfs.c
@@ -8,7 +8,9 @@
#include <linux/debugfs.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/clnt.h>
+
#include "netns.h"
+#include "fail.h"

static struct dentry *topdir;
static struct dentry *rpc_clnt_dir;
@@ -297,6 +299,25 @@ static const struct file_operations fault_disconnect_fops = {
.release = fault_release,
};

+
+#if IS_ENABLED(CONFIG_FAULT_INJECTION)
+struct fail_sunrpc_attr fail_sunrpc = {
+ .attr = FAULT_ATTR_INITIALIZER,
+};
+
+#if IS_ENABLED(CONFIG_FAULT_INJECTION_DEBUG_FS)
+static void fail_sunrpc_init(void)
+{
+ fault_create_debugfs_attr("fail_sunrpc", NULL,
+ &fail_sunrpc.attr);
+}
+#else
+static inline void fail_sunrpc_init(void)
+{
+}
+#endif
+#endif
+
void __exit
sunrpc_debugfs_exit(void)
{
@@ -321,4 +342,6 @@ sunrpc_debugfs_init(void)

debugfs_create_file("disconnect", S_IFREG | 0400, rpc_fault_dir, NULL,
&fault_disconnect_fops);
+
+ fail_sunrpc_init();
}
diff --git a/net/sunrpc/fail.h b/net/sunrpc/fail.h
new file mode 100644
index 000000000000..1d402b0d3453
--- /dev/null
+++ b/net/sunrpc/fail.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2021, Oracle. All rights reserved.
+ */
+
+#ifndef _NET_SUNRPC_FAIL_H_
+#define _NET_SUNRPC_FAIL_H_
+
+#include <linux/fault-inject.h>
+
+#if IS_ENABLED(CONFIG_FAULT_INJECTION)
+
+struct fail_sunrpc_attr {
+ struct fault_attr attr;
+};
+
+extern struct fail_sunrpc_attr fail_sunrpc;
+
+#endif /* CONFIG_FAULT_INJECTION */
+
+#endif /* _NET_SUNRPC_FAIL_H_ */