2be714e9b382742be19d7c628f292500d65f77ce
[linux-2.6.git] / net / sunrpc / sysctl.c
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
22 /*
23  * Declare the debug flags here
24  */
25 unsigned int    rpc_debug;
26 unsigned int    nfs_debug;
27 unsigned int    nfsd_debug;
28 unsigned int    nlm_debug;
29
30 #ifdef RPC_DEBUG
31
32 static struct ctl_table_header *sunrpc_table_header;
33 static ctl_table                sunrpc_table[];
34
35 void
36 rpc_register_sysctl(void)
37 {
38         if (!sunrpc_table_header)
39                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
40 }
41
42 void
43 rpc_unregister_sysctl(void)
44 {
45         if (sunrpc_table_header) {
46                 unregister_sysctl_table(sunrpc_table_header);
47                 sunrpc_table_header = NULL;
48         }
49 }
50
51 static int
52 proc_dodebug(ctl_table *table, int write, struct file *file,
53                                 void __user *buffer, size_t *lenp, loff_t *ppos)
54 {
55         char            tmpbuf[20], c, *s;
56         char __user *p;
57         unsigned int    value;
58         size_t          left, len;
59
60         if ((*ppos && !write) || !*lenp) {
61                 *lenp = 0;
62                 return 0;
63         }
64
65         left = *lenp;
66
67         if (write) {
68                 if (!access_ok(VERIFY_READ, buffer, left))
69                         return -EFAULT;
70                 p = buffer;
71                 while (left && __get_user(c, p) >= 0 && isspace(c))
72                         left--, p++;
73                 if (!left)
74                         goto done;
75
76                 if (left > sizeof(tmpbuf) - 1)
77                         return -EINVAL;
78                 if (copy_from_user(tmpbuf, p, left))
79                         return -EFAULT;
80                 tmpbuf[left] = '\0';
81
82                 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
83                         value = 10 * value + (*s - '0');
84                 if (*s && !isspace(*s))
85                         return -EINVAL;
86                 while (left && isspace(*s))
87                         left--, s++;
88                 *(unsigned int *) table->data = value;
89                 /* Display the RPC tasks on writing to rpc_debug */
90                 if (strcmp(table->procname, "rpc_debug") == 0)
91                         rpc_show_tasks();
92         } else {
93                 if (!access_ok(VERIFY_WRITE, buffer, left))
94                         return -EFAULT;
95                 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
96                 if (len > left)
97                         len = left;
98                 if (__copy_to_user(buffer, tmpbuf, len))
99                         return -EFAULT;
100                 if ((left -= len) > 0) {
101                         if (put_user('\n', (char __user *)buffer + len))
102                                 return -EFAULT;
103                         left--;
104                 }
105         }
106
107 done:
108         *lenp -= left;
109         *ppos += *lenp;
110         return 0;
111 }
112
113
114 static ctl_table debug_table[] = {
115         {
116                 .procname       = "rpc_debug",
117                 .data           = &rpc_debug,
118                 .maxlen         = sizeof(int),
119                 .mode           = 0644,
120                 .proc_handler   = &proc_dodebug
121         },
122         {
123                 .procname       = "nfs_debug",
124                 .data           = &nfs_debug,
125                 .maxlen         = sizeof(int),
126                 .mode           = 0644,
127                 .proc_handler   = &proc_dodebug
128         },
129         {
130                 .procname       = "nfsd_debug",
131                 .data           = &nfsd_debug,
132                 .maxlen         = sizeof(int),
133                 .mode           = 0644,
134                 .proc_handler   = &proc_dodebug
135         },
136         {
137                 .procname       = "nlm_debug",
138                 .data           = &nlm_debug,
139                 .maxlen         = sizeof(int),
140                 .mode           = 0644,
141                 .proc_handler   = &proc_dodebug
142         },
143         { .ctl_name = 0 }
144 };
145
146 static ctl_table sunrpc_table[] = {
147         {
148                 .ctl_name       = CTL_SUNRPC,
149                 .procname       = "sunrpc",
150                 .mode           = 0555,
151                 .child          = debug_table
152         },
153         { .ctl_name = 0 }
154 };
155
156 #endif