1 /*
2 * linux/net/sunrpc/sysctl.c
3 *
4 * Sysctl interface to sunrpc module. This is for debugging only now.
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/version.h>
12 #include <linux/types.h>
13 #include <linux/linkage.h>
14 #include <linux/ctype.h>
15 #include <linux/fs.h>
16 #include <linux/sysctl.h>
17 #define __NO_VERSION__
18 #include <linux/module.h>
19
20 #include <asm/uaccess.h>
21 #include <linux/sunrpc/types.h>
22 #include <linux/sunrpc/sched.h>
23 #include <linux/sunrpc/stats.h>
24
25 /*
26 * Declare the debug flags here
27 */
28 unsigned int rpc_debug;
29 unsigned int nfs_debug;
30 unsigned int nfsd_debug;
31 unsigned int nlm_debug;
32
33 #ifdef RPC_DEBUG
34
35 static struct ctl_table_header *sunrpc_table_header;
36 static ctl_table sunrpc_table[];
37
38 void
39 rpc_register_sysctl(void)
40 {
41 if (!sunrpc_table_header) {
42 sunrpc_table_header = register_sysctl_table(sunrpc_table, 1);
43 #ifdef CONFIG_PROC_FS
44 if (sunrpc_table[0].de)
45 sunrpc_table[0].de->owner = THIS_MODULE;
46 #endif
47 }
48
49 }
50
51 void
52 rpc_unregister_sysctl(void)
53 {
54 if (sunrpc_table_header) {
55 unregister_sysctl_table(sunrpc_table_header);
56 sunrpc_table_header = NULL;
57 }
58 }
59
60 static int
61 proc_dodebug(ctl_table *table, int write, struct file *file,
62 void *buffer, size_t *lenp)
63 {
64 char tmpbuf[20], *p, c;
65 unsigned int value;
66 int left, len;
67
68 if ((file->f_pos && !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 = (char *) 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 copy_from_user(tmpbuf, p, left);
87 tmpbuf[left] = '\0';
88
89 for (p = tmpbuf, value = 0; '' <= *p && *p <= '9'; p++, left--)
90 value = 10 * value + (*p - '');
91 if (*p && !isspace(*p))
92 return -EINVAL;
93 while (left && isspace(*p))
94 left--, p++;
95 *(unsigned int *) table->data = value;
96 /* Display the RPC tasks on writing to rpc_debug */
97 if (table->ctl_name == CTL_RPCDEBUG) {
98 rpc_show_tasks();
99 }
100 } else {
101 if (!access_ok(VERIFY_WRITE, buffer, left))
102 return -EFAULT;
103 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
104 if (len > left)
105 len = left;
106 copy_to_user(buffer, tmpbuf, len);
107 if ((left -= len) > 0) {
108 put_user('\n', (char *)buffer + len);
109 left--;
110 }
111 }
112
113 done:
114 *lenp -= left;
115 file->f_pos += *lenp;
116 return 0;
117 }
118
119 #define DIRENTRY(nam1, nam2, child) \
120 {CTL_##nam1, #nam2, NULL, 0, 0555, child }
121 #define DBGENTRY(nam1, nam2) \
122 {CTL_##nam1##DEBUG, #nam2 "_debug", &nam2##_debug, sizeof(int),\
123 0644, NULL, &proc_dodebug}
124
125 static ctl_table debug_table[] = {
126 DBGENTRY(RPC, rpc),
127 DBGENTRY(NFS, nfs),
128 DBGENTRY(NFSD, nfsd),
129 DBGENTRY(NLM, nlm),
130 {0}
131 };
132
133 static ctl_table sunrpc_table[] = {
134 DIRENTRY(SUNRPC, sunrpc, debug_table),
135 {0}
136 };
137
138 #endif
139
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