blob: 82b27528d0c45b50b2b25416b84b9f03b1d6ac74 [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{
38 if (!sunrpc_table_header) {
39 sunrpc_table_header = register_sysctl_table(sunrpc_table, 1);
40#ifdef CONFIG_PROC_FS
41 if (sunrpc_table[0].de)
42 sunrpc_table[0].de->owner = THIS_MODULE;
43#endif
44 }
45
46}
47
48void
49rpc_unregister_sysctl(void)
50{
51 if (sunrpc_table_header) {
52 unregister_sysctl_table(sunrpc_table_header);
53 sunrpc_table_header = NULL;
54 }
55}
56
57static int
58proc_dodebug(ctl_table *table, int write, struct file *file,
59 void __user *buffer, size_t *lenp, loff_t *ppos)
60{
61 char tmpbuf[20], c, *s;
62 char __user *p;
63 unsigned int value;
64 size_t left, len;
65
66 if ((*ppos && !write) || !*lenp) {
67 *lenp = 0;
68 return 0;
69 }
70
71 left = *lenp;
72
73 if (write) {
74 if (!access_ok(VERIFY_READ, buffer, left))
75 return -EFAULT;
76 p = buffer;
77 while (left && __get_user(c, p) >= 0 && isspace(c))
78 left--, p++;
79 if (!left)
80 goto done;
81
82 if (left > sizeof(tmpbuf) - 1)
83 return -EINVAL;
84 if (copy_from_user(tmpbuf, p, left))
85 return -EFAULT;
86 tmpbuf[left] = '\0';
87
88 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
89 value = 10 * value + (*s - '0');
90 if (*s && !isspace(*s))
91 return -EINVAL;
92 while (left && isspace(*s))
93 left--, s++;
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 if (__copy_to_user(buffer, tmpbuf, len))
106 return -EFAULT;
107 if ((left -= len) > 0) {
108 if (put_user('\n', (char __user *)buffer + len))
109 return -EFAULT;
110 left--;
111 }
112 }
113
114done:
115 *lenp -= left;
116 *ppos += *lenp;
117 return 0;
118}
119
Chuck Levera246b012005-08-11 16:25:23 -0400120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121static ctl_table debug_table[] = {
122 {
123 .ctl_name = CTL_RPCDEBUG,
124 .procname = "rpc_debug",
125 .data = &rpc_debug,
126 .maxlen = sizeof(int),
127 .mode = 0644,
128 .proc_handler = &proc_dodebug
129 },
130 {
131 .ctl_name = CTL_NFSDEBUG,
132 .procname = "nfs_debug",
133 .data = &nfs_debug,
134 .maxlen = sizeof(int),
135 .mode = 0644,
136 .proc_handler = &proc_dodebug
137 },
138 {
139 .ctl_name = CTL_NFSDDEBUG,
140 .procname = "nfsd_debug",
141 .data = &nfsd_debug,
142 .maxlen = sizeof(int),
143 .mode = 0644,
144 .proc_handler = &proc_dodebug
145 },
146 {
147 .ctl_name = CTL_NLMDEBUG,
148 .procname = "nlm_debug",
149 .data = &nlm_debug,
150 .maxlen = sizeof(int),
151 .mode = 0644,
152 .proc_handler = &proc_dodebug
153 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 { .ctl_name = 0 }
155};
156
157static ctl_table sunrpc_table[] = {
158 {
159 .ctl_name = CTL_SUNRPC,
160 .procname = "sunrpc",
161 .mode = 0555,
162 .child = debug_table
163 },
164 { .ctl_name = 0 }
165};
166
167#endif