Merge tag 'acpi-5.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[sfrench/cifs-2.6.git] / net / sunrpc / sysctl.c
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 <linux/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 #include "netns.h"
24
25 /*
26  * Declare the debug flags here
27  */
28 unsigned int    rpc_debug;
29 EXPORT_SYMBOL_GPL(rpc_debug);
30
31 unsigned int    nfs_debug;
32 EXPORT_SYMBOL_GPL(nfs_debug);
33
34 unsigned int    nfsd_debug;
35 EXPORT_SYMBOL_GPL(nfsd_debug);
36
37 unsigned int    nlm_debug;
38 EXPORT_SYMBOL_GPL(nlm_debug);
39
40 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
41
42 static struct ctl_table_header *sunrpc_table_header;
43 static struct ctl_table sunrpc_table[];
44
45 void
46 rpc_register_sysctl(void)
47 {
48         if (!sunrpc_table_header)
49                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
50 }
51
52 void
53 rpc_unregister_sysctl(void)
54 {
55         if (sunrpc_table_header) {
56                 unregister_sysctl_table(sunrpc_table_header);
57                 sunrpc_table_header = NULL;
58         }
59 }
60
61 static int proc_do_xprt(struct ctl_table *table, int write,
62                         void __user *buffer, size_t *lenp, loff_t *ppos)
63 {
64         char tmpbuf[256];
65         size_t len;
66
67         if ((*ppos && !write) || !*lenp) {
68                 *lenp = 0;
69                 return 0;
70         }
71         len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
72         return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len);
73 }
74
75 static int
76 proc_dodebug(struct ctl_table *table, int write,
77                                 void __user *buffer, size_t *lenp, loff_t *ppos)
78 {
79         char            tmpbuf[20], c, *s = NULL;
80         char __user *p;
81         unsigned int    value;
82         size_t          left, len;
83
84         if ((*ppos && !write) || !*lenp) {
85                 *lenp = 0;
86                 return 0;
87         }
88
89         left = *lenp;
90
91         if (write) {
92                 if (!access_ok(buffer, left))
93                         return -EFAULT;
94                 p = buffer;
95                 while (left && __get_user(c, p) >= 0 && isspace(c))
96                         left--, p++;
97                 if (!left)
98                         goto done;
99
100                 if (left > sizeof(tmpbuf) - 1)
101                         return -EINVAL;
102                 if (copy_from_user(tmpbuf, p, left))
103                         return -EFAULT;
104                 tmpbuf[left] = '\0';
105
106                 value = simple_strtol(tmpbuf, &s, 0);
107                 if (s) {
108                         left -= (s - tmpbuf);
109                         if (left && !isspace(*s))
110                                 return -EINVAL;
111                         while (left && isspace(*s))
112                                 left--, s++;
113                 } else
114                         left = 0;
115                 *(unsigned int *) table->data = value;
116                 /* Display the RPC tasks on writing to rpc_debug */
117                 if (strcmp(table->procname, "rpc_debug") == 0)
118                         rpc_show_tasks(&init_net);
119         } else {
120                 len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);
121                 if (len > left)
122                         len = left;
123                 if (copy_to_user(buffer, tmpbuf, len))
124                         return -EFAULT;
125                 if ((left -= len) > 0) {
126                         if (put_user('\n', (char __user *)buffer + len))
127                                 return -EFAULT;
128                         left--;
129                 }
130         }
131
132 done:
133         *lenp -= left;
134         *ppos += *lenp;
135         return 0;
136 }
137
138
139 static struct ctl_table debug_table[] = {
140         {
141                 .procname       = "rpc_debug",
142                 .data           = &rpc_debug,
143                 .maxlen         = sizeof(int),
144                 .mode           = 0644,
145                 .proc_handler   = proc_dodebug
146         },
147         {
148                 .procname       = "nfs_debug",
149                 .data           = &nfs_debug,
150                 .maxlen         = sizeof(int),
151                 .mode           = 0644,
152                 .proc_handler   = proc_dodebug
153         },
154         {
155                 .procname       = "nfsd_debug",
156                 .data           = &nfsd_debug,
157                 .maxlen         = sizeof(int),
158                 .mode           = 0644,
159                 .proc_handler   = proc_dodebug
160         },
161         {
162                 .procname       = "nlm_debug",
163                 .data           = &nlm_debug,
164                 .maxlen         = sizeof(int),
165                 .mode           = 0644,
166                 .proc_handler   = proc_dodebug
167         },
168         {
169                 .procname       = "transports",
170                 .maxlen         = 256,
171                 .mode           = 0444,
172                 .proc_handler   = proc_do_xprt,
173         },
174         { }
175 };
176
177 static struct ctl_table sunrpc_table[] = {
178         {
179                 .procname       = "sunrpc",
180                 .mode           = 0555,
181                 .child          = debug_table
182         },
183         { }
184 };
185
186 #endif