1 /*
2 * linux/net/sunrpc/sysctl.c
3 *
4 * Sysctl interface to sunrpc module.
5 *
6 * I would prefer to register the sunrpc table below sys/net, but that's
7 * impossible at the moment.
8 */
9
10 #include <linux/types.h>
11 #include <linux/linkage.h>
12 #include <linux/ctype.h>
13 #include <linux/fs.h>
14 #include <linux/sysctl.h>
15 #include <linux/module.h>
16
17 #include <asm/uaccess.h>
18 #include <linux/sunrpc/types.h>
19 #include <linux/sunrpc/sched.h>
20 #include <linux/sunrpc/stats.h>
21 #include <linux/sunrpc/svc_xprt.h>
22
23 /*
24 * Declare the debug flags here
25 */
26 unsigned int rpc_debug;
27 EXPORT_SYMBOL_GPL(rpc_debug);
28
29 unsigned int nfs_debug;
30 EXPORT_SYMBOL_GPL(nfs_debug);
31
32 unsigned int nfsd_debug;
33 EXPORT_SYMBOL_GPL(nfsd_debug);
34
35 unsigned int nlm_debug;
36 EXPORT_SYMBOL_GPL(nlm_debug);
37
38 #ifdef RPC_DEBUG
39
40 static struct ctl_table_header *sunrpc_table_header;
41 static ctl_table sunrpc_table[];
42
43 void
44 rpc_register_sysctl(void)
45 {
46 if (!sunrpc_table_header)
47 sunrpc_table_header = register_sysctl_table(sunrpc_table);
48 }
49
50 void
51 rpc_unregister_sysctl(void)
52 {
53 if (sunrpc_table_header) {
54 unregister_sysctl_table(sunrpc_table_header);
55 sunrpc_table_header = NULL;
56 }
57 }
58
59 static int proc_do_xprt(ctl_table *table, int write, struct file *file,
60 void __user *buffer, size_t *lenp, loff_t *ppos)
61 {
62 char tmpbuf[256];
63 int len;
64 if ((*ppos && !write) || !*lenp) {
65 *lenp = 0;
66 return 0;
67 }
68 if (write)
69 return -EINVAL;
70 else {
71 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
72 if (!access_ok(VERIFY_WRITE, buffer, len))
73 return -EFAULT;
74
75 if (__copy_to_user(buffer, tmpbuf, len))
76 return -EFAULT;
77 }
78 *lenp -= len;
79 *ppos += len;
80 return 0;
81 }
82
83 static int
84 proc_dodebug(ctl_table *table, int write, struct file *file,
85 void __user *buffer, size_t *lenp, loff_t *ppos)
86 {
87 char tmpbuf[20], c, *s;
88 char __user *p;
89 unsigned int value;
90 size_t left, len;
91
92 if ((*ppos && !write) || !*lenp) {
93 *lenp = 0;
94 return 0;
95 }
96
97 left = *lenp;
98
99 if (write) {
100 if (!access_ok(VERIFY_READ, buffer, left))
101 return -EFAULT;
102 p = buffer;
103 while (left && __get_user(c, p) >= 0 && isspace(c))
104 left--, p++;
105 if (!left)
106 goto done;
107
108 if (left > sizeof(tmpbuf) - 1)
109 return -EINVAL;
110 if (copy_from_user(tmpbuf, p, left))
111 return -EFAULT;
112 tmpbuf[left] = '\0';
113
114 for (s = tmpbuf, value = 0; '' <= *s && *s <= '9'; s++, left--)
115 value = 10 * value + (*s - '');
116 if (*s && !isspace(*s))
117 return -EINVAL;
118 while (left && isspace(*s))
119 left--, s++;
120 *(unsigned int *) table->data = value;
121 /* Display the RPC tasks on writing to rpc_debug */
122 if (strcmp(table->procname, "rpc_debug") == 0)
123 rpc_show_tasks();
124 } else {
125 if (!access_ok(VERIFY_WRITE, buffer, left))
126 return -EFAULT;
127 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
128 if (len > left)
129 len = left;
130 if (__copy_to_user(buffer, tmpbuf, len))
131 return -EFAULT;
132 if ((left -= len) > 0) {
133 if (put_user('\n', (char __user *)buffer + len))
134 return -EFAULT;
135 left--;
136 }
137 }
138
139 done:
140 *lenp -= left;
141 *ppos += *lenp;
142 return 0;
143 }
144
145
146 static ctl_table debug_table[] = {
147 {
148 .procname = "rpc_debug",
149 .data = &rpc_debug,
150 .maxlen = sizeof(int),
151 .mode = 0644,
152 .proc_handler = &proc_dodebug
153 },
154 {
155 .procname = "nfs_debug",
156 .data = &nfs_debug,
157 .maxlen = sizeof(int),
158 .mode = 0644,
159 .proc_handler = &proc_dodebug
160 },
161 {
162 .procname = "nfsd_debug",
163 .data = &nfsd_debug,
164 .maxlen = sizeof(int),
165 .mode = 0644,
166 .proc_handler = &proc_dodebug
167 },
168 {
169 .procname = "nlm_debug",
170 .data = &nlm_debug,
171 .maxlen = sizeof(int),
172 .mode = 0644,
173 .proc_handler = &proc_dodebug
174 },
175 {
176 .procname = "transports",
177 .maxlen = 256,
178 .mode = 0444,
179 .proc_handler = &proc_do_xprt,
180 },
181 { .ctl_name = 0 }
182 };
183
184 static ctl_table sunrpc_table[] = {
185 {
186 .ctl_name = CTL_SUNRPC,
187 .procname = "sunrpc",
188 .mode = 0555,
189 .child = debug_table
190 },
191 { .ctl_name = 0 }
192 };
193
194 #endif
195
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