blob: 738db32a287d0be1500e0f67d1ce3676f439783b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22/*
23 * Declare the debug flags here
24 */
25unsigned int rpc_debug;
26unsigned int nfs_debug;
27unsigned int nfsd_debug;
28unsigned int nlm_debug;
29
30#ifdef RPC_DEBUG
31
32static struct ctl_table_header *sunrpc_table_header;
33static ctl_table sunrpc_table[];
34
35void
36rpc_register_sysctl(void)
37{
Eric W. Biederman2b1bec52007-02-14 00:33:24 -080038 if (!sunrpc_table_header)
Eric W. Biederman0b4d4142007-02-14 00:34:09 -080039 sunrpc_table_header = register_sysctl_table(sunrpc_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040}
41
42void
43rpc_unregister_sysctl(void)
44{
45 if (sunrpc_table_header) {
46 unregister_sysctl_table(sunrpc_table_header);
47 sunrpc_table_header = NULL;
48 }
49}
50
51static int
52proc_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 (table->ctl_name == CTL_RPCDEBUG) {
91 rpc_show_tasks();
92 }
93 } else {
94 if (!access_ok(VERIFY_WRITE, buffer, left))
95 return -EFAULT;
96 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
97 if (len > left)
98 len = left;
99 if (__copy_to_user(buffer, tmpbuf, len))
100 return -EFAULT;
101 if ((left -= len) > 0) {
102 if (put_user('\n', (char __user *)buffer + len))
103 return -EFAULT;
104 left--;
105 }
106 }
107
108done:
109 *lenp -= left;
110 *ppos += *lenp;
111 return 0;
112}
113
Chuck Levera246b012005-08-11 16:25:23 -0400114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115static ctl_table debug_table[] = {
116 {
117 .ctl_name = CTL_RPCDEBUG,
118 .procname = "rpc_debug",
119 .data = &rpc_debug,
120 .maxlen = sizeof(int),
121 .mode = 0644,
122 .proc_handler = &proc_dodebug
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800123 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 {
125 .ctl_name = CTL_NFSDEBUG,
126 .procname = "nfs_debug",
127 .data = &nfs_debug,
128 .maxlen = sizeof(int),
129 .mode = 0644,
130 .proc_handler = &proc_dodebug
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800131 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 {
133 .ctl_name = CTL_NFSDDEBUG,
134 .procname = "nfsd_debug",
135 .data = &nfsd_debug,
136 .maxlen = sizeof(int),
137 .mode = 0644,
138 .proc_handler = &proc_dodebug
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800139 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 {
141 .ctl_name = CTL_NLMDEBUG,
142 .procname = "nlm_debug",
143 .data = &nlm_debug,
144 .maxlen = sizeof(int),
145 .mode = 0644,
146 .proc_handler = &proc_dodebug
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800147 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 { .ctl_name = 0 }
149};
150
151static ctl_table sunrpc_table[] = {
152 {
153 .ctl_name = CTL_SUNRPC,
154 .procname = "sunrpc",
155 .mode = 0555,
156 .child = debug_table
157 },
158 { .ctl_name = 0 }
159};
160
161#endif