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/config.h>
11 #include <linux/types.h>
12 #include <linux/linkage.h>
13 #include <linux/ctype.h>
14 #include <linux/fs.h>
15 #include <linux/sysctl.h>
16 #include <linux/module.h>
17
18 #include <asm/uaccess.h>
19 #include <linux/sunrpc/types.h>
20 #include <linux/sunrpc/sched.h>
21 #include <linux/sunrpc/stats.h>
22 #include <linux/sunrpc/xprt.h>
23
24 /*
25 * Declare the debug flags here
26 */
27 unsigned int rpc_debug;
28 unsigned int nfs_debug;
29 unsigned int nfsd_debug;
30 unsigned int nlm_debug;
31
32 #ifdef RPC_DEBUG
33
34 static struct ctl_table_header *sunrpc_table_header;
35 static ctl_table sunrpc_table[];
36
37 void
38 rpc_register_sysctl(void)
39 {
40 if (!sunrpc_table_header) {
41 sunrpc_table_header = register_sysctl_table(sunrpc_table, 1);
42 #ifdef CONFIG_PROC_FS
43 if (sunrpc_table[0].de)
44 sunrpc_table[0].de->owner = THIS_MODULE;
45 #endif
46 }
47
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
60 proc_dodebug(ctl_table *table, int write, struct file *file,
61 void __user *buffer, size_t *lenp, loff_t *ppos)
62 {
63 char tmpbuf[20], c, *s;
64 char __user *p;
65 unsigned int value;
66 size_t left, len;
67
68 if ((*ppos && !write) || !*lenp) {
69 *lenp = 0;
70 return 0;
71 }
72
73 left = *lenp;
74
75 if (write) {
76 if (!access_ok(VERIFY_READ, buffer, left))
77 return -EFAULT;
78 p = buffer;
79 while (left && __get_user(c, p) >= 0 && isspace(c))
80 left--, p++;
81 if (!left)
82 goto done;
83
84 if (left > sizeof(tmpbuf) - 1)
85 return -EINVAL;
86 if (copy_from_user(tmpbuf, p, left))
87 return -EFAULT;
88 tmpbuf[left] = '\0';
89
90 for (s = tmpbuf, value = 0; '' <= *s && *s <= '9'; s++, left--)
91 value = 10 * value + (*s - '');
92 if (*s && !isspace(*s))
93 return -EINVAL;
94 while (left && isspace(*s))
95 left--, s++;
96 *(unsigned int *) table->data = value;
97 /* Display the RPC tasks on writing to rpc_debug */
98 if (table->ctl_name == CTL_RPCDEBUG) {
99 rpc_show_tasks();
100 }
101 } else {
102 if (!access_ok(VERIFY_WRITE, buffer, left))
103 return -EFAULT;
104 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
105 if (len > left)
106 len = left;
107 if (__copy_to_user(buffer, tmpbuf, len))
108 return -EFAULT;
109 if ((left -= len) > 0) {
110 if (put_user('\n', (char __user *)buffer + len))
111 return -EFAULT;
112 left--;
113 }
114 }
115
116 done:
117 *lenp -= left;
118 *ppos += *lenp;
119 return 0;
120 }
121
122 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
123 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
124
125 static ctl_table debug_table[] = {
126 {
127 .ctl_name = CTL_RPCDEBUG,
128 .procname = "rpc_debug",
129 .data = &rpc_debug,
130 .maxlen = sizeof(int),
131 .mode = 0644,
132 .proc_handler = &proc_dodebug
133 },
134 {
135 .ctl_name = CTL_NFSDEBUG,
136 .procname = "nfs_debug",
137 .data = &nfs_debug,
138 .maxlen = sizeof(int),
139 .mode = 0644,
140 .proc_handler = &proc_dodebug
141 },
142 {
143 .ctl_name = CTL_NFSDDEBUG,
144 .procname = "nfsd_debug",
145 .data = &nfsd_debug,
146 .maxlen = sizeof(int),
147 .mode = 0644,
148 .proc_handler = &proc_dodebug
149 },
150 {
151 .ctl_name = CTL_NLMDEBUG,
152 .procname = "nlm_debug",
153 .data = &nlm_debug,
154 .maxlen = sizeof(int),
155 .mode = 0644,
156 .proc_handler = &proc_dodebug
157 },
158 {
159 .ctl_name = CTL_SLOTTABLE_UDP,
160 .procname = "udp_slot_table_entries",
161 .data = &xprt_udp_slot_table_entries,
162 .maxlen = sizeof(unsigned int),
163 .mode = 0644,
164 .proc_handler = &proc_dointvec_minmax,
165 .strategy = &sysctl_intvec,
166 .extra1 = &min_slot_table_size,
167 .extra2 = &max_slot_table_size
168 },
169 {
170 .ctl_name = CTL_SLOTTABLE_TCP,
171 .procname = "tcp_slot_table_entries",
172 .data = &xprt_tcp_slot_table_entries,
173 .maxlen = sizeof(unsigned int),
174 .mode = 0644,
175 .proc_handler = &proc_dointvec_minmax,
176 .strategy = &sysctl_intvec,
177 .extra1 = &min_slot_table_size,
178 .extra2 = &max_slot_table_size
179 },
180 { .ctl_name = 0 }
181 };
182
183 static ctl_table sunrpc_table[] = {
184 {
185 .ctl_name = CTL_SUNRPC,
186 .procname = "sunrpc",
187 .mode = 0555,
188 .child = debug_table
189 },
190 { .ctl_name = 0 }
191 };
192
193 #endif
194
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