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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 | #include <linux/sunrpc/svc_xprt.h> |
22 | |
23 | /* |
24 | * Declare the debug flags here |
25 | */ |
26 | unsigned int rpc_debug; |
27 | EXPORT_SYMBOL_GPL(rpc_debug); |
28 | |
29 | unsigned int nfs_debug; |
30 | EXPORT_SYMBOL_GPL(nfs_debug); |
31 | |
32 | unsigned int nfsd_debug; |
33 | EXPORT_SYMBOL_GPL(nfsd_debug); |
34 | |
35 | unsigned int nlm_debug; |
36 | EXPORT_SYMBOL_GPL(nlm_debug); |
37 | |
38 | #ifdef RPC_DEBUG |
39 | |
40 | static struct ctl_table_header *sunrpc_table_header; |
41 | static ctl_table sunrpc_table[]; |
42 | |
43 | void |
44 | rpc_register_sysctl(void) |
45 | { |
46 | if (!sunrpc_table_header) |
47 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
48 | } |
49 | |
50 | void |
51 | rpc_unregister_sysctl(void) |
52 | { |
53 | if (sunrpc_table_header) { |
54 | unregister_sysctl_table(sunrpc_table_header); |
55 | sunrpc_table_header = NULL; |
56 | } |
57 | } |
58 | |
59 | static int proc_do_xprt(ctl_table *table, int write, |
60 | void __user *buffer, size_t *lenp, loff_t *ppos) |
61 | { |
62 | char tmpbuf[256]; |
63 | size_t len; |
64 | |
65 | if ((*ppos && !write) || !*lenp) { |
66 | *lenp = 0; |
67 | return 0; |
68 | } |
69 | len = svc_print_xprts(tmpbuf, sizeof(tmpbuf)); |
70 | return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len); |
71 | } |
72 | |
73 | static int |
74 | proc_dodebug(ctl_table *table, int write, |
75 | void __user *buffer, size_t *lenp, loff_t *ppos) |
76 | { |
77 | char tmpbuf[20], c, *s; |
78 | char __user *p; |
79 | unsigned int value; |
80 | size_t left, len; |
81 | |
82 | if ((*ppos && !write) || !*lenp) { |
83 | *lenp = 0; |
84 | return 0; |
85 | } |
86 | |
87 | left = *lenp; |
88 | |
89 | if (write) { |
90 | if (!access_ok(VERIFY_READ, buffer, left)) |
91 | return -EFAULT; |
92 | p = buffer; |
93 | while (left && __get_user(c, p) >= 0 && isspace(c)) |
94 | left--, p++; |
95 | if (!left) |
96 | goto done; |
97 | |
98 | if (left > sizeof(tmpbuf) - 1) |
99 | return -EINVAL; |
100 | if (copy_from_user(tmpbuf, p, left)) |
101 | return -EFAULT; |
102 | tmpbuf[left] = '\0'; |
103 | |
104 | for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--) |
105 | value = 10 * value + (*s - '0'); |
106 | if (*s && !isspace(*s)) |
107 | return -EINVAL; |
108 | while (left && isspace(*s)) |
109 | left--, s++; |
110 | *(unsigned int *) table->data = value; |
111 | /* Display the RPC tasks on writing to rpc_debug */ |
112 | if (strcmp(table->procname, "rpc_debug") == 0) |
113 | rpc_show_tasks(); |
114 | } else { |
115 | if (!access_ok(VERIFY_WRITE, buffer, left)) |
116 | return -EFAULT; |
117 | len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data); |
118 | if (len > left) |
119 | len = left; |
120 | if (__copy_to_user(buffer, tmpbuf, len)) |
121 | return -EFAULT; |
122 | if ((left -= len) > 0) { |
123 | if (put_user('\n', (char __user *)buffer + len)) |
124 | return -EFAULT; |
125 | left--; |
126 | } |
127 | } |
128 | |
129 | done: |
130 | *lenp -= left; |
131 | *ppos += *lenp; |
132 | return 0; |
133 | } |
134 | |
135 | |
136 | static ctl_table debug_table[] = { |
137 | { |
138 | .procname = "rpc_debug", |
139 | .data = &rpc_debug, |
140 | .maxlen = sizeof(int), |
141 | .mode = 0644, |
142 | .proc_handler = &proc_dodebug |
143 | }, |
144 | { |
145 | .procname = "nfs_debug", |
146 | .data = &nfs_debug, |
147 | .maxlen = sizeof(int), |
148 | .mode = 0644, |
149 | .proc_handler = &proc_dodebug |
150 | }, |
151 | { |
152 | .procname = "nfsd_debug", |
153 | .data = &nfsd_debug, |
154 | .maxlen = sizeof(int), |
155 | .mode = 0644, |
156 | .proc_handler = &proc_dodebug |
157 | }, |
158 | { |
159 | .procname = "nlm_debug", |
160 | .data = &nlm_debug, |
161 | .maxlen = sizeof(int), |
162 | .mode = 0644, |
163 | .proc_handler = &proc_dodebug |
164 | }, |
165 | { |
166 | .procname = "transports", |
167 | .maxlen = 256, |
168 | .mode = 0444, |
169 | .proc_handler = &proc_do_xprt, |
170 | }, |
171 | { .ctl_name = 0 } |
172 | }; |
173 | |
174 | static ctl_table sunrpc_table[] = { |
175 | { |
176 | .ctl_name = CTL_SUNRPC, |
177 | .procname = "sunrpc", |
178 | .mode = 0555, |
179 | .child = debug_table |
180 | }, |
181 | { .ctl_name = 0 } |
182 | }; |
183 | |
184 | #endif |
185 |
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