tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/net/sunrpc/sysctl.c
4 *
5 * Sysctl interface to sunrpc module.
6 *
7 * I would prefer to register the sunrpc table below sys/net, but that's
8 * impossible at the moment.
9 */
10
11#include <linux/types.h>
12#include <linux/linkage.h>
13#include <linux/ctype.h>
14#include <linux/fs.h>
15#include <linux/sysctl.h>
16#include <linux/module.h>
17
18#include <linux/uaccess.h>
19#include <linux/sunrpc/types.h>
20#include <linux/sunrpc/sched.h>
21#include <linux/sunrpc/stats.h>
22#include <linux/sunrpc/svc_xprt.h>
23
24#include "netns.h"
25
26/*
27 * Declare the debug flags here
28 */
29unsigned int rpc_debug;
30EXPORT_SYMBOL_GPL(rpc_debug);
31
32unsigned int nfs_debug;
33EXPORT_SYMBOL_GPL(nfs_debug);
34
35unsigned int nfsd_debug;
36EXPORT_SYMBOL_GPL(nfsd_debug);
37
38unsigned int nlm_debug;
39EXPORT_SYMBOL_GPL(nlm_debug);
40
41#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
42
43static struct ctl_table_header *sunrpc_table_header;
44static struct ctl_table sunrpc_table[];
45
46void
47rpc_register_sysctl(void)
48{
49 if (!sunrpc_table_header)
50 sunrpc_table_header = register_sysctl_table(sunrpc_table);
51}
52
53void
54rpc_unregister_sysctl(void)
55{
56 if (sunrpc_table_header) {
57 unregister_sysctl_table(sunrpc_table_header);
58 sunrpc_table_header = NULL;
59 }
60}
61
62static int proc_do_xprt(struct ctl_table *table, int write,
63 void *buffer, size_t *lenp, loff_t *ppos)
64{
65 char tmpbuf[256];
66 size_t len;
67
68 if ((*ppos && !write) || !*lenp) {
69 *lenp = 0;
70 return 0;
71 }
72 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
73 *lenp = memory_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len);
74
75 if (*lenp < 0) {
76 *lenp = 0;
77 return -EINVAL;
78 }
79 return 0;
80}
81
82static int
83proc_dodebug(struct ctl_table *table, int write, void *buffer, size_t *lenp,
84 loff_t *ppos)
85{
86 char tmpbuf[20], *s = NULL;
87 char *p;
88 unsigned int value;
89 size_t left, len;
90
91 if ((*ppos && !write) || !*lenp) {
92 *lenp = 0;
93 return 0;
94 }
95
96 left = *lenp;
97
98 if (write) {
99 p = buffer;
100 while (left && isspace(*p)) {
101 left--;
102 p++;
103 }
104 if (!left)
105 goto done;
106
107 if (left > sizeof(tmpbuf) - 1)
108 return -EINVAL;
109 memcpy(tmpbuf, p, left);
110 tmpbuf[left] = '\0';
111
112 value = simple_strtol(tmpbuf, &s, 0);
113 if (s) {
114 left -= (s - tmpbuf);
115 if (left && !isspace(*s))
116 return -EINVAL;
117 while (left && isspace(*s)) {
118 left--;
119 s++;
120 }
121 } else
122 left = 0;
123 *(unsigned int *) table->data = value;
124 /* Display the RPC tasks on writing to rpc_debug */
125 if (strcmp(table->procname, "rpc_debug") == 0)
126 rpc_show_tasks(&init_net);
127 } else {
128 len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);
129 if (len > left)
130 len = left;
131 memcpy(buffer, tmpbuf, len);
132 if ((left -= len) > 0) {
133 *((char *)buffer + len) = '\n';
134 left--;
135 }
136 }
137
138done:
139 *lenp -= left;
140 *ppos += *lenp;
141 return 0;
142}
143
144
145static struct ctl_table debug_table[] = {
146 {
147 .procname = "rpc_debug",
148 .data = &rpc_debug,
149 .maxlen = sizeof(int),
150 .mode = 0644,
151 .proc_handler = proc_dodebug
152 },
153 {
154 .procname = "nfs_debug",
155 .data = &nfs_debug,
156 .maxlen = sizeof(int),
157 .mode = 0644,
158 .proc_handler = proc_dodebug
159 },
160 {
161 .procname = "nfsd_debug",
162 .data = &nfsd_debug,
163 .maxlen = sizeof(int),
164 .mode = 0644,
165 .proc_handler = proc_dodebug
166 },
167 {
168 .procname = "nlm_debug",
169 .data = &nlm_debug,
170 .maxlen = sizeof(int),
171 .mode = 0644,
172 .proc_handler = proc_dodebug
173 },
174 {
175 .procname = "transports",
176 .maxlen = 256,
177 .mode = 0444,
178 .proc_handler = proc_do_xprt,
179 },
180 { }
181};
182
183static struct ctl_table sunrpc_table[] = {
184 {
185 .procname = "sunrpc",
186 .mode = 0555,
187 .child = debug_table
188 },
189 { }
190};
191
192#endif