summaryrefslogtreecommitdiffstats
path: root/net/sunrpc/sysctl.c
blob: 8c3936403fea40826f6bd24200cbaf095c947ff0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
/*
 * linux/net/sunrpc/sysctl.c
 *
 * Sysctl interface to sunrpc module.
 *
 * I would prefer to register the sunrpc table below sys/net, but that's
 * impossible at the moment.
 */

#include <linux/types.h>
#include <linux/linkage.h>
#include <linux/ctype.h>
#include <linux/fs.h>
#include <linux/sysctl.h>
#include <linux/module.h>

#include <linux/uaccess.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/svc_xprt.h>

#include "netns.h"

/*
 * Declare the debug flags here
 */
unsigned int	rpc_debug;
EXPORT_SYMBOL_GPL(rpc_debug);

unsigned int	nfs_debug;
EXPORT_SYMBOL_GPL(nfs_debug);

unsigned int	nfsd_debug;
EXPORT_SYMBOL_GPL(nfsd_debug);

unsigned int	nlm_debug;
EXPORT_SYMBOL_GPL(nlm_debug);

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)

static struct ctl_table_header *sunrpc_table_header;
static struct ctl_table sunrpc_table[];

void
rpc_register_sysctl(void)
{
	if (!sunrpc_table_header)
		sunrpc_table_header = register_sysctl_table(sunrpc_table);
}

void
rpc_unregister_sysctl(void)
{
	if (sunrpc_table_header) {
		unregister_sysctl_table(sunrpc_table_header);
		sunrpc_table_header = NULL;
	}
}

static int proc_do_xprt(struct ctl_table *table, int write,
			void __user *buffer, size_t *lenp, loff_t *ppos)
{
	char tmpbuf[256];
	size_t len;

	if ((*ppos && !write) || !*lenp) {
		*lenp = 0;
		return 0;
	}
	len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
	return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len);
}

static int
proc_dodebug(struct ctl_table *table, int write,
				void __user *buffer, size_t *lenp, loff_t *ppos)
{
	char		tmpbuf[20], c, *s = NULL;
	char __user *p;
	unsigned int	value;
	size_t		left, len;

	if ((*ppos && !write) || !*lenp) {
		*lenp = 0;
		return 0;
	}

	left = *lenp;

	if (write) {
		if (!access_ok(VERIFY_READ, buffer, left))
			return -EFAULT;
		p = buffer;
		while (left && __get_user(c, p) >= 0 && isspace(c))
			left--, p++;
		if (!left)
			goto done;

		if (left > sizeof(tmpbuf) - 1)
			return -EINVAL;
		if (copy_from_user(tmpbuf, p, left))
			return -EFAULT;
		tmpbuf[left] = '\0';

		value = simple_strtol(tmpbuf, &s, 0);
		if (s) {
			left -= (s - tmpbuf);
			if (left && !isspace(*s))
				return -EINVAL;
			while (left && isspace(*s))
				left--, s++;
		} else
			left = 0;
		*(unsigned int *) table->data = value;
		/* Display the RPC tasks on writing to rpc_debug */
		if (strcmp(table->procname, "rpc_debug") == 0)
			rpc_show_tasks(&init_net);
	} else {
		len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);
		if (len > left)
			len = left;
		if (copy_to_user(buffer, tmpbuf, len))
			return -EFAULT;
		if ((left -= len) > 0) {
			if (put_user('\n', (char __user *)buffer + len))
				return -EFAULT;
			left--;
		}
	}

done:
	*lenp -= left;
	*ppos += *lenp;
	return 0;
}


static struct ctl_table debug_table[] = {
	{
		.procname	= "rpc_debug",
		.data		= &rpc_debug,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dodebug
	},
	{
		.procname	= "nfs_debug",
		.data		= &nfs_debug,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dodebug
	},
	{
		.procname	= "nfsd_debug",
		.data		= &nfsd_debug,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dodebug
	},
	{
		.procname	= "nlm_debug",
		.data		= &nlm_debug,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dodebug
	},
	{
		.procname	= "transports",
		.maxlen		= 256,
		.mode		= 0444,
		.proc_handler	= proc_do_xprt,
	},
	{ }
};

static struct ctl_table sunrpc_table[] = {
	{
		.procname	= "sunrpc",
		.mode		= 0555,
		.child		= debug_table
	},
	{ }
};

#endif
OpenPOWER on IntegriCloud