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65178db4 BS |
1 | /* |
2 | * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com> | |
3 | * | |
4 | * Uses debugfs to create fault injection points for client testing | |
5 | */ | |
6 | ||
7 | #include <linux/types.h> | |
8 | #include <linux/fs.h> | |
9 | #include <linux/debugfs.h> | |
10 | #include <linux/module.h> | |
6c1e82a4 | 11 | #include <linux/nsproxy.h> |
5976687a | 12 | #include <linux/sunrpc/addr.h> |
d7cc431e | 13 | #include <asm/uaccess.h> |
65178db4 BS |
14 | |
15 | #include "state.h" | |
6c1e82a4 | 16 | #include "netns.h" |
65178db4 BS |
17 | |
18 | struct nfsd_fault_inject_op { | |
19 | char *file; | |
c96223d3 JL |
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); | |
8ce54e0d | 24 | u64 (*forget)(struct nfs4_client *, u64); |
184c1847 | 25 | u64 (*print)(struct nfs4_client *, u64); |
65178db4 BS |
26 | }; |
27 | ||
65178db4 BS |
28 | static struct dentry *debug_dir; |
29 | ||
c96223d3 | 30 | static u64 nfsd_inject_set(struct nfsd_fault_inject_op *op, u64 val) |
65178db4 | 31 | { |
c96223d3 | 32 | u64 count; |
65178db4 | 33 | |
04395839 | 34 | nfs4_lock_state(); |
8ce54e0d | 35 | count = nfsd_for_n_state(val, op->forget); |
04395839 | 36 | nfs4_unlock_state(); |
c96223d3 | 37 | return count; |
65178db4 BS |
38 | } |
39 | ||
c96223d3 | 40 | static u64 nfsd_inject_set_client(struct nfsd_fault_inject_op *op, |
6c1e82a4 BS |
41 | struct sockaddr_storage *addr, |
42 | size_t addr_size) | |
43 | { | |
6c1e82a4 | 44 | struct nfs4_client *clp; |
c96223d3 | 45 | u64 count = 0; |
6c1e82a4 BS |
46 | |
47 | nfs4_lock_state(); | |
48 | clp = nfsd_find_client(addr, addr_size); | |
c96223d3 | 49 | if (clp) |
6c1e82a4 | 50 | count = op->forget(clp, 0); |
6c1e82a4 | 51 | nfs4_unlock_state(); |
c96223d3 | 52 | return count; |
6c1e82a4 BS |
53 | } |
54 | ||
c96223d3 | 55 | static u64 nfsd_inject_get(struct nfsd_fault_inject_op *op) |
65178db4 | 56 | { |
c96223d3 JL |
57 | u64 count; |
58 | ||
184c1847 | 59 | nfs4_lock_state(); |
c96223d3 | 60 | count = nfsd_for_n_state(0, op->print); |
184c1847 | 61 | nfs4_unlock_state(); |
c96223d3 JL |
62 | |
63 | return count; | |
65178db4 BS |
64 | } |
65 | ||
d7cc431e BS |
66 | static ssize_t fault_inject_read(struct file *file, char __user *buf, |
67 | size_t len, loff_t *ppos) | |
68 | { | |
69 | static u64 val; | |
70 | char read_buf[25]; | |
f3e41ec5 | 71 | size_t size; |
d7cc431e | 72 | loff_t pos = *ppos; |
c96223d3 | 73 | struct nfsd_fault_inject_op *op = file_inode(file)->i_private; |
d7cc431e BS |
74 | |
75 | if (!pos) | |
c96223d3 | 76 | val = op->get(op); |
d7cc431e BS |
77 | size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val); |
78 | ||
f3e41ec5 | 79 | return simple_read_from_buffer(buf, len, ppos, read_buf, size); |
d7cc431e BS |
80 | } |
81 | ||
82 | static ssize_t fault_inject_write(struct file *file, const char __user *buf, | |
83 | size_t len, loff_t *ppos) | |
84 | { | |
6c1e82a4 | 85 | char write_buf[INET6_ADDRSTRLEN]; |
18d9a2ca | 86 | size_t size = min(sizeof(write_buf) - 1, len); |
6c1e82a4 BS |
87 | struct net *net = current->nsproxy->net_ns; |
88 | struct sockaddr_storage sa; | |
c96223d3 | 89 | struct nfsd_fault_inject_op *op = file_inode(file)->i_private; |
d7cc431e | 90 | u64 val; |
d4c8e34f | 91 | char *nl; |
d7cc431e BS |
92 | |
93 | if (copy_from_user(write_buf, buf, size)) | |
94 | return -EFAULT; | |
6c1e82a4 BS |
95 | write_buf[size] = '\0'; |
96 | ||
d4c8e34f JL |
97 | /* Deal with any embedded newlines in the string */ |
98 | nl = strchr(write_buf, '\n'); | |
99 | if (nl) { | |
100 | size = nl - write_buf; | |
101 | *nl = '\0'; | |
102 | } | |
103 | ||
6c1e82a4 | 104 | size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa)); |
c96223d3 JL |
105 | if (size > 0) { |
106 | val = op->set_clnt(op, &sa, size); | |
107 | if (val) | |
108 | pr_info("NFSD [%s]: Client %s had %llu state object(s)\n", | |
109 | op->file, write_buf, val); | |
110 | } else { | |
6c1e82a4 | 111 | val = simple_strtoll(write_buf, NULL, 0); |
c96223d3 JL |
112 | if (val == 0) |
113 | pr_info("NFSD Fault Injection: %s (all)", op->file); | |
114 | else | |
115 | pr_info("NFSD Fault Injection: %s (n = %llu)", | |
116 | op->file, val); | |
117 | val = op->set_val(op, val); | |
118 | pr_info("NFSD: %s: found %llu", op->file, val); | |
6c1e82a4 | 119 | } |
d7cc431e BS |
120 | return len; /* on success, claim we got the whole input */ |
121 | } | |
122 | ||
123 | static const struct file_operations fops_nfsd = { | |
124 | .owner = THIS_MODULE, | |
125 | .read = fault_inject_read, | |
126 | .write = fault_inject_write, | |
127 | }; | |
65178db4 BS |
128 | |
129 | void nfsd_fault_inject_cleanup(void) | |
130 | { | |
131 | debugfs_remove_recursive(debug_dir); | |
132 | } | |
133 | ||
c96223d3 JL |
134 | static struct nfsd_fault_inject_op inject_ops[] = { |
135 | { | |
136 | .file = "forget_clients", | |
7ec0e36f | 137 | .get = nfsd_inject_print_clients, |
69fc9edf | 138 | .set_val = nfsd_inject_forget_clients, |
a0926d15 | 139 | .set_clnt = nfsd_inject_forget_client, |
c96223d3 JL |
140 | }, |
141 | { | |
142 | .file = "forget_locks", | |
016200c3 JL |
143 | .get = nfsd_inject_print_locks, |
144 | .set_val = nfsd_inject_forget_locks, | |
145 | .set_clnt = nfsd_inject_forget_client_locks, | |
c96223d3 JL |
146 | }, |
147 | { | |
148 | .file = "forget_openowners", | |
149 | .get = nfsd_inject_get, | |
150 | .set_val = nfsd_inject_set, | |
151 | .set_clnt = nfsd_inject_set_client, | |
152 | .forget = nfsd_forget_client_openowners, | |
153 | .print = nfsd_print_client_openowners, | |
154 | }, | |
155 | { | |
156 | .file = "forget_delegations", | |
157 | .get = nfsd_inject_get, | |
158 | .set_val = nfsd_inject_set, | |
159 | .set_clnt = nfsd_inject_set_client, | |
160 | .forget = nfsd_forget_client_delegations, | |
161 | .print = nfsd_print_client_delegations, | |
162 | }, | |
163 | { | |
164 | .file = "recall_delegations", | |
165 | .get = nfsd_inject_get, | |
166 | .set_val = nfsd_inject_set, | |
167 | .set_clnt = nfsd_inject_set_client, | |
168 | .forget = nfsd_recall_client_delegations, | |
169 | .print = nfsd_print_client_delegations, | |
170 | }, | |
171 | }; | |
172 | ||
173 | #define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op)) | |
174 | ||
65178db4 BS |
175 | int nfsd_fault_inject_init(void) |
176 | { | |
177 | unsigned int i; | |
178 | struct nfsd_fault_inject_op *op; | |
88187398 | 179 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
65178db4 BS |
180 | |
181 | debug_dir = debugfs_create_dir("nfsd", NULL); | |
182 | if (!debug_dir) | |
183 | goto fail; | |
184 | ||
185 | for (i = 0; i < NUM_INJECT_OPS; i++) { | |
186 | op = &inject_ops[i]; | |
187 | if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd)) | |
188 | goto fail; | |
189 | } | |
190 | return 0; | |
191 | ||
192 | fail: | |
193 | nfsd_fault_inject_cleanup(); | |
194 | return -ENOMEM; | |
195 | } |