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 #include <linux/module.h>
18
19 #include <asm/uaccess.h>
20 #include <linux/sunrpc/types.h>
21 #include <linux/sunrpc/sched.h>
22 #include <linux/sunrpc/stats.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
rpc_register_sysctl(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
rpc_unregister_sysctl(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_dodebug(ctl_table * table,int write,struct file * file,void * buffer,size_t * lenp)60 proc_dodebug(ctl_table *table, int write, struct file *file,
61 void *buffer, size_t *lenp)
62 {
63 char tmpbuf[20], *p, c;
64 unsigned int value;
65 size_t left, len;
66
67 if ((file->f_pos && !write) || !*lenp) {
68 *lenp = 0;
69 return 0;
70 }
71
72 left = *lenp;
73
74 if (write) {
75 if (!access_ok(VERIFY_READ, buffer, left))
76 return -EFAULT;
77 p = (char *) buffer;
78 while (left && __get_user(c, p) >= 0 && isspace(c))
79 left--, p++;
80 if (!left)
81 goto done;
82
83 if (left > sizeof(tmpbuf) - 1)
84 return -EINVAL;
85 copy_from_user(tmpbuf, p, left);
86 tmpbuf[left] = '\0';
87
88 for (p = tmpbuf, value = 0; '0' <= *p && *p <= '9'; p++, left--)
89 value = 10 * value + (*p - '0');
90 if (*p && !isspace(*p))
91 return -EINVAL;
92 while (left && isspace(*p))
93 left--, p++;
94 *(unsigned int *) table->data = value;
95 /* Display the RPC tasks on writing to rpc_debug */
96 if (table->ctl_name == CTL_RPCDEBUG) {
97 rpc_show_tasks();
98 }
99 } else {
100 if (!access_ok(VERIFY_WRITE, buffer, left))
101 return -EFAULT;
102 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
103 if (len > left)
104 len = left;
105 copy_to_user(buffer, tmpbuf, len);
106 if ((left -= len) > 0) {
107 put_user('\n', (char *)buffer + len);
108 left--;
109 }
110 }
111
112 done:
113 *lenp -= left;
114 file->f_pos += *lenp;
115 return 0;
116 }
117
118 #define DIRENTRY(nam1, nam2, child) \
119 {CTL_##nam1, #nam2, NULL, 0, 0555, child }
120 #define DBGENTRY(nam1, nam2) \
121 {CTL_##nam1##DEBUG, #nam2 "_debug", &nam2##_debug, sizeof(int),\
122 0644, NULL, &proc_dodebug}
123
124 static ctl_table debug_table[] = {
125 DBGENTRY(RPC, rpc),
126 DBGENTRY(NFS, nfs),
127 DBGENTRY(NFSD, nfsd),
128 DBGENTRY(NLM, nlm),
129 {0}
130 };
131
132 static ctl_table sunrpc_table[] = {
133 DIRENTRY(SUNRPC, sunrpc, debug_table),
134 {0}
135 };
136
137 #endif
138