Merge branches 'release' and 'gpe-ack' into release
[linux-2.6] / 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 #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; '0' <= *s && *s <= '9'; s++, left--)
115                         value = 10 * value + (*s - '0');
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