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-rw-r--r--fs/nfsd/fault_inject.c142
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);
+ }
+}