1 files changed, 142 insertions, 0 deletions
diff --git a/fs/nfsd/fault_inject.c b/fs/nfsd/fault_inject.c
new file mode 100644
index 000000000..76bee0a0d
--- /dev/null
+++ b/fs/nfsd/fault_inject.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
+ *
+ * Uses debugfs to create fault injection points for client testing
+ */
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/module.h>
+#include <linux/nsproxy.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+
+#include "state.h"
+#include "netns.h"
+
+struct nfsd_fault_inject_op {
+	char *file;
+	u64 (*get)(void);
+	u64 (*set_val)(u64);
+	u64 (*set_clnt)(struct sockaddr_storage *, size_t);
+};
+
+static struct dentry *debug_dir;
+
+static ssize_t fault_inject_read(struct file *file, char __user *buf,
+				 size_t len, loff_t *ppos)
+{
+	static u64 val;
+	char read_buf[25];
+	size_t size;
+	loff_t pos = *ppos;
+	struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
+
+	if (!pos)
+		val = op->get();
+	size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);
+
+	return simple_read_from_buffer(buf, len, ppos, read_buf, size);
+}
+
+static ssize_t fault_inject_write(struct file *file, const char __user *buf,
+				  size_t len, loff_t *ppos)
+{
+	char write_buf[INET6_ADDRSTRLEN];
+	size_t size = min(sizeof(write_buf) - 1, len);
+	struct net *net = current->nsproxy->net_ns;
+	struct sockaddr_storage sa;
+	struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
+	u64 val;
+	char *nl;
+
+	if (copy_from_user(write_buf, buf, size))
+		return -EFAULT;
+	write_buf[size] = '\0';
+
+	/* Deal with any embedded newlines in the string */
+	nl = strchr(write_buf, '\n');
+	if (nl) {
+		size = nl - write_buf;
+		*nl = '\0';
+	}
+
+	size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
+	if (size > 0) {
+		val = op->set_clnt(&sa, size);
+		if (val)
+			pr_info("NFSD [%s]: Client %s had %llu state object(s)\n",
+				op->file, write_buf, val);
+	} else {
+		val = simple_strtoll(write_buf, NULL, 0);
+		if (val == 0)
+			pr_info("NFSD Fault Injection: %s (all)", op->file);
+		else
+			pr_info("NFSD Fault Injection: %s (n = %llu)",
+				op->file, val);
+		val = op->set_val(val);
+		pr_info("NFSD: %s: found %llu", op->file, val);
+	}
+	return len; /* on success, claim we got the whole input */
+}
+
+static const struct file_operations fops_nfsd = {
+	.owner   = THIS_MODULE,
+	.read    = fault_inject_read,
+	.write   = fault_inject_write,
+};
+
+void nfsd_fault_inject_cleanup(void)
+{
+	debugfs_remove_recursive(debug_dir);
+}
+
+static struct nfsd_fault_inject_op inject_ops[] = {
+	{
+		.file     = "forget_clients",
+		.get	  = nfsd_inject_print_clients,
+		.set_val  = nfsd_inject_forget_clients,
+		.set_clnt = nfsd_inject_forget_client,
+	},
+	{
+		.file     = "forget_locks",
+		.get	  = nfsd_inject_print_locks,
+		.set_val  = nfsd_inject_forget_locks,
+		.set_clnt = nfsd_inject_forget_client_locks,
+	},
+	{
+		.file     = "forget_openowners",
+		.get	  = nfsd_inject_print_openowners,
+		.set_val  = nfsd_inject_forget_openowners,
+		.set_clnt = nfsd_inject_forget_client_openowners,
+	},
+	{
+		.file     = "forget_delegations",
+		.get	  = nfsd_inject_print_delegations,
+		.set_val  = nfsd_inject_forget_delegations,
+		.set_clnt = nfsd_inject_forget_client_delegations,
+	},
+	{
+		.file     = "recall_delegations",
+		.get	  = nfsd_inject_print_delegations,
+		.set_val  = nfsd_inject_recall_delegations,
+		.set_clnt = nfsd_inject_recall_client_delegations,
+	},
+};
+
+void nfsd_fault_inject_init(void)
+{
+	unsigned int i;
+	struct nfsd_fault_inject_op *op;
+	umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+
+	debug_dir = debugfs_create_dir("nfsd", NULL);
+
+	for (i = 0; i < ARRAY_SIZE(inject_ops); i++) {
+		op = &inject_ops[i];
+		debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd);
+	}
+}