2 * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
4 * Uses debugfs to create fault injection points for client testing
7 #include <linux/types.h>
9 #include <linux/debugfs.h>
10 #include <linux/module.h>
11 #include <linux/nsproxy.h>
12 #include <linux/sunrpc/addr.h>
13 #include <asm/uaccess.h>
18 struct nfsd_fault_inject_op {
20 u64 (*get)(struct nfsd_fault_inject_op *);
21 u64 (*set_val)(struct nfsd_fault_inject_op *, u64);
22 u64 (*set_clnt)(struct nfsd_fault_inject_op *,
23 struct sockaddr_storage *, size_t);
24 u64 (*forget)(struct nfs4_client *, u64);
25 u64 (*print)(struct nfs4_client *, u64);
28 static struct dentry *debug_dir;
30 static u64 nfsd_inject_set(struct nfsd_fault_inject_op *op, u64 val)
35 count = nfsd_for_n_state(val, op->forget);
40 static u64 nfsd_inject_set_client(struct nfsd_fault_inject_op *op,
41 struct sockaddr_storage *addr,
44 struct nfs4_client *clp;
48 clp = nfsd_find_client(addr, addr_size);
50 count = op->forget(clp, 0);
55 static u64 nfsd_inject_get(struct nfsd_fault_inject_op *op)
60 count = nfsd_for_n_state(0, op->print);
66 static ssize_t fault_inject_read(struct file *file, char __user *buf,
67 size_t len, loff_t *ppos)
73 struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
77 size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);
79 return simple_read_from_buffer(buf, len, ppos, read_buf, size);
82 static ssize_t fault_inject_write(struct file *file, const char __user *buf,
83 size_t len, loff_t *ppos)
85 char write_buf[INET6_ADDRSTRLEN];
86 size_t size = min(sizeof(write_buf) - 1, len);
87 struct net *net = current->nsproxy->net_ns;
88 struct sockaddr_storage sa;
89 struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
93 if (copy_from_user(write_buf, buf, size))
95 write_buf[size] = '\0';
97 /* Deal with any embedded newlines in the string */
98 nl = strchr(write_buf, '\n');
100 size = nl - write_buf;
104 size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
106 val = op->set_clnt(op, &sa, size);
108 pr_info("NFSD [%s]: Client %s had %llu state object(s)\n",
109 op->file, write_buf, val);
111 val = simple_strtoll(write_buf, NULL, 0);
113 pr_info("NFSD Fault Injection: %s (all)", op->file);
115 pr_info("NFSD Fault Injection: %s (n = %llu)",
117 val = op->set_val(op, val);
118 pr_info("NFSD: %s: found %llu", op->file, val);
120 return len; /* on success, claim we got the whole input */
123 static const struct file_operations fops_nfsd = {
124 .owner = THIS_MODULE,
125 .read = fault_inject_read,
126 .write = fault_inject_write,
129 void nfsd_fault_inject_cleanup(void)
131 debugfs_remove_recursive(debug_dir);
134 static struct nfsd_fault_inject_op inject_ops[] = {
136 .file = "forget_clients",
137 .get = nfsd_inject_print_clients,
138 .set_val = nfsd_inject_forget_clients,
139 .set_clnt = nfsd_inject_forget_client,
142 .file = "forget_locks",
143 .get = nfsd_inject_get,
144 .set_val = nfsd_inject_set,
145 .set_clnt = nfsd_inject_set_client,
146 .forget = nfsd_forget_client_locks,
147 .print = nfsd_print_client_locks,
150 .file = "forget_openowners",
151 .get = nfsd_inject_get,
152 .set_val = nfsd_inject_set,
153 .set_clnt = nfsd_inject_set_client,
154 .forget = nfsd_forget_client_openowners,
155 .print = nfsd_print_client_openowners,
158 .file = "forget_delegations",
159 .get = nfsd_inject_get,
160 .set_val = nfsd_inject_set,
161 .set_clnt = nfsd_inject_set_client,
162 .forget = nfsd_forget_client_delegations,
163 .print = nfsd_print_client_delegations,
166 .file = "recall_delegations",
167 .get = nfsd_inject_get,
168 .set_val = nfsd_inject_set,
169 .set_clnt = nfsd_inject_set_client,
170 .forget = nfsd_recall_client_delegations,
171 .print = nfsd_print_client_delegations,
175 #define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op))
177 int nfsd_fault_inject_init(void)
180 struct nfsd_fault_inject_op *op;
181 umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
183 debug_dir = debugfs_create_dir("nfsd", NULL);
187 for (i = 0; i < NUM_INJECT_OPS; i++) {
189 if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
195 nfsd_fault_inject_cleanup();