Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 */
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);
40}
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
114
115static ctl_table debug_table[] = {
116 {
117 .procname = "rpc_debug",
118 .data = &rpc_debug,
119 .maxlen = sizeof(int),
120 .mode = 0644,
121 .proc_handler = &proc_dodebug
122 },
123 {
124 .procname = "nfs_debug",
125 .data = &nfs_debug,
126 .maxlen = sizeof(int),
127 .mode = 0644,
128 .proc_handler = &proc_dodebug
129 },
130 {
131 .procname = "nfsd_debug",
132 .data = &nfsd_debug,
133 .maxlen = sizeof(int),
134 .mode = 0644,
135 .proc_handler = &proc_dodebug
136 },
137 {
138 .procname = "nlm_debug",
139 .data = &nlm_debug,
140 .maxlen = sizeof(int),
141 .mode = 0644,
142 .proc_handler = &proc_dodebug
143 },
144 { .ctl_name = 0 }
145};
146
147static ctl_table sunrpc_table[] = {
148 {
149 .ctl_name = CTL_SUNRPC,
150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = debug_table
153 },
154 { .ctl_name = 0 }
155};
156
157#endif