Commit | Line | Data |
---|---|---|
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; | |
285abdee JL |
20 | u64 (*get)(void); |
21 | u64 (*set_val)(u64); | |
22 | u64 (*set_clnt)(struct sockaddr_storage *, size_t); | |
65178db4 BS |
23 | }; |
24 | ||
65178db4 BS |
25 | static struct dentry *debug_dir; |
26 | ||
d7cc431e BS |
27 | static ssize_t fault_inject_read(struct file *file, char __user *buf, |
28 | size_t len, loff_t *ppos) | |
29 | { | |
30 | static u64 val; | |
31 | char read_buf[25]; | |
f3e41ec5 | 32 | size_t size; |
d7cc431e | 33 | loff_t pos = *ppos; |
c96223d3 | 34 | struct nfsd_fault_inject_op *op = file_inode(file)->i_private; |
d7cc431e BS |
35 | |
36 | if (!pos) | |
285abdee | 37 | val = op->get(); |
d7cc431e BS |
38 | size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val); |
39 | ||
f3e41ec5 | 40 | return simple_read_from_buffer(buf, len, ppos, read_buf, size); |
d7cc431e BS |
41 | } |
42 | ||
43 | static ssize_t fault_inject_write(struct file *file, const char __user *buf, | |
44 | size_t len, loff_t *ppos) | |
45 | { | |
6c1e82a4 | 46 | char write_buf[INET6_ADDRSTRLEN]; |
18d9a2ca | 47 | size_t size = min(sizeof(write_buf) - 1, len); |
6c1e82a4 BS |
48 | struct net *net = current->nsproxy->net_ns; |
49 | struct sockaddr_storage sa; | |
c96223d3 | 50 | struct nfsd_fault_inject_op *op = file_inode(file)->i_private; |
d7cc431e | 51 | u64 val; |
d4c8e34f | 52 | char *nl; |
d7cc431e BS |
53 | |
54 | if (copy_from_user(write_buf, buf, size)) | |
55 | return -EFAULT; | |
6c1e82a4 BS |
56 | write_buf[size] = '\0'; |
57 | ||
d4c8e34f JL |
58 | /* Deal with any embedded newlines in the string */ |
59 | nl = strchr(write_buf, '\n'); | |
60 | if (nl) { | |
61 | size = nl - write_buf; | |
62 | *nl = '\0'; | |
63 | } | |
64 | ||
6c1e82a4 | 65 | size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa)); |
c96223d3 | 66 | if (size > 0) { |
285abdee | 67 | val = op->set_clnt(&sa, size); |
c96223d3 JL |
68 | if (val) |
69 | pr_info("NFSD [%s]: Client %s had %llu state object(s)\n", | |
70 | op->file, write_buf, val); | |
71 | } else { | |
6c1e82a4 | 72 | val = simple_strtoll(write_buf, NULL, 0); |
c96223d3 JL |
73 | if (val == 0) |
74 | pr_info("NFSD Fault Injection: %s (all)", op->file); | |
75 | else | |
76 | pr_info("NFSD Fault Injection: %s (n = %llu)", | |
77 | op->file, val); | |
285abdee | 78 | val = op->set_val(val); |
c96223d3 | 79 | pr_info("NFSD: %s: found %llu", op->file, val); |
6c1e82a4 | 80 | } |
d7cc431e BS |
81 | return len; /* on success, claim we got the whole input */ |
82 | } | |
83 | ||
84 | static const struct file_operations fops_nfsd = { | |
85 | .owner = THIS_MODULE, | |
86 | .read = fault_inject_read, | |
87 | .write = fault_inject_write, | |
88 | }; | |
65178db4 BS |
89 | |
90 | void nfsd_fault_inject_cleanup(void) | |
91 | { | |
92 | debugfs_remove_recursive(debug_dir); | |
93 | } | |
94 | ||
c96223d3 JL |
95 | static struct nfsd_fault_inject_op inject_ops[] = { |
96 | { | |
97 | .file = "forget_clients", | |
7ec0e36f | 98 | .get = nfsd_inject_print_clients, |
69fc9edf | 99 | .set_val = nfsd_inject_forget_clients, |
a0926d15 | 100 | .set_clnt = nfsd_inject_forget_client, |
c96223d3 JL |
101 | }, |
102 | { | |
103 | .file = "forget_locks", | |
016200c3 JL |
104 | .get = nfsd_inject_print_locks, |
105 | .set_val = nfsd_inject_forget_locks, | |
106 | .set_clnt = nfsd_inject_forget_client_locks, | |
c96223d3 JL |
107 | }, |
108 | { | |
109 | .file = "forget_openowners", | |
82e05efa JL |
110 | .get = nfsd_inject_print_openowners, |
111 | .set_val = nfsd_inject_forget_openowners, | |
112 | .set_clnt = nfsd_inject_forget_client_openowners, | |
c96223d3 JL |
113 | }, |
114 | { | |
115 | .file = "forget_delegations", | |
98d5c7c5 JL |
116 | .get = nfsd_inject_print_delegations, |
117 | .set_val = nfsd_inject_forget_delegations, | |
118 | .set_clnt = nfsd_inject_forget_client_delegations, | |
c96223d3 JL |
119 | }, |
120 | { | |
121 | .file = "recall_delegations", | |
98d5c7c5 JL |
122 | .get = nfsd_inject_print_delegations, |
123 | .set_val = nfsd_inject_recall_delegations, | |
124 | .set_clnt = nfsd_inject_recall_client_delegations, | |
c96223d3 JL |
125 | }, |
126 | }; | |
127 | ||
128 | #define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op)) | |
129 | ||
65178db4 BS |
130 | int nfsd_fault_inject_init(void) |
131 | { | |
132 | unsigned int i; | |
133 | struct nfsd_fault_inject_op *op; | |
88187398 | 134 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
65178db4 BS |
135 | |
136 | debug_dir = debugfs_create_dir("nfsd", NULL); | |
137 | if (!debug_dir) | |
138 | goto fail; | |
139 | ||
140 | for (i = 0; i < NUM_INJECT_OPS; i++) { | |
141 | op = &inject_ops[i]; | |
142 | if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd)) | |
143 | goto fail; | |
144 | } | |
145 | return 0; | |
146 | ||
147 | fail: | |
148 | nfsd_fault_inject_cleanup(); | |
149 | return -ENOMEM; | |
150 | } |