1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
5 * Uses debugfs to create fault injection points for client testing
8 #include <linux/types.h>
10 #include <linux/debugfs.h>
11 #include <linux/module.h>
12 #include <linux/nsproxy.h>
13 #include <linux/sunrpc/addr.h>
14 #include <linux/uaccess.h>
19 struct nfsd_fault_inject_op {
23 u64 (*set_clnt)(struct sockaddr_storage *, size_t);
26 static struct dentry *debug_dir;
28 static ssize_t fault_inject_read(struct file *file, char __user *buf,
29 size_t len, loff_t *ppos)
35 struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
39 size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);
41 return simple_read_from_buffer(buf, len, ppos, read_buf, size);
44 static ssize_t fault_inject_write(struct file *file, const char __user *buf,
45 size_t len, loff_t *ppos)
47 char write_buf[INET6_ADDRSTRLEN];
48 size_t size = min(sizeof(write_buf) - 1, len);
49 struct net *net = current->nsproxy->net_ns;
50 struct sockaddr_storage sa;
51 struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
55 if (copy_from_user(write_buf, buf, size))
57 write_buf[size] = '\0';
59 /* Deal with any embedded newlines in the string */
60 nl = strchr(write_buf, '\n');
62 size = nl - write_buf;
66 size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
68 val = op->set_clnt(&sa, size);
70 pr_info("NFSD [%s]: Client %s had %llu state object(s)\n",
71 op->file, write_buf, val);
73 val = simple_strtoll(write_buf, NULL, 0);
75 pr_info("NFSD Fault Injection: %s (all)", op->file);
77 pr_info("NFSD Fault Injection: %s (n = %llu)",
79 val = op->set_val(val);
80 pr_info("NFSD: %s: found %llu", op->file, val);
82 return len; /* on success, claim we got the whole input */
85 static const struct file_operations fops_nfsd = {
87 .read = fault_inject_read,
88 .write = fault_inject_write,
91 void nfsd_fault_inject_cleanup(void)
93 debugfs_remove_recursive(debug_dir);
96 static struct nfsd_fault_inject_op inject_ops[] = {
98 .file = "forget_clients",
99 .get = nfsd_inject_print_clients,
100 .set_val = nfsd_inject_forget_clients,
101 .set_clnt = nfsd_inject_forget_client,
104 .file = "forget_locks",
105 .get = nfsd_inject_print_locks,
106 .set_val = nfsd_inject_forget_locks,
107 .set_clnt = nfsd_inject_forget_client_locks,
110 .file = "forget_openowners",
111 .get = nfsd_inject_print_openowners,
112 .set_val = nfsd_inject_forget_openowners,
113 .set_clnt = nfsd_inject_forget_client_openowners,
116 .file = "forget_delegations",
117 .get = nfsd_inject_print_delegations,
118 .set_val = nfsd_inject_forget_delegations,
119 .set_clnt = nfsd_inject_forget_client_delegations,
122 .file = "recall_delegations",
123 .get = nfsd_inject_print_delegations,
124 .set_val = nfsd_inject_recall_delegations,
125 .set_clnt = nfsd_inject_recall_client_delegations,
129 #define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op))
131 int nfsd_fault_inject_init(void)
134 struct nfsd_fault_inject_op *op;
135 umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
137 debug_dir = debugfs_create_dir("nfsd", NULL);
141 for (i = 0; i < NUM_INJECT_OPS; i++) {
143 if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
149 nfsd_fault_inject_cleanup();