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Source at commit b05a5adf03613de371c77c3235f7d970d7cd0c71 created 13 years 1 month ago. By Lars-Peter Clausen, NAND: Optimize reading the eec data for the JZ4740 (evil hack) | |
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1 | /* |
2 | * Copyright (C) 2007 |
3 | * |
4 | * Author: Eric Biederman <ebiederm@xmision.com> |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License as |
8 | * published by the Free Software Foundation, version 2 of the |
9 | * License. |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/uts.h> |
14 | #include <linux/utsname.h> |
15 | #include <linux/sysctl.h> |
16 | |
17 | static void *get_uts(ctl_table *table, int write) |
18 | { |
19 | char *which = table->data; |
20 | struct uts_namespace *uts_ns; |
21 | |
22 | uts_ns = current->nsproxy->uts_ns; |
23 | which = (which - (char *)&init_uts_ns) + (char *)uts_ns; |
24 | |
25 | if (!write) |
26 | down_read(&uts_sem); |
27 | else |
28 | down_write(&uts_sem); |
29 | return which; |
30 | } |
31 | |
32 | static void put_uts(ctl_table *table, int write, void *which) |
33 | { |
34 | if (!write) |
35 | up_read(&uts_sem); |
36 | else |
37 | up_write(&uts_sem); |
38 | } |
39 | |
40 | #ifdef CONFIG_PROC_SYSCTL |
41 | /* |
42 | * Special case of dostring for the UTS structure. This has locks |
43 | * to observe. Should this be in kernel/sys.c ???? |
44 | */ |
45 | static int proc_do_uts_string(ctl_table *table, int write, |
46 | void __user *buffer, size_t *lenp, loff_t *ppos) |
47 | { |
48 | struct ctl_table uts_table; |
49 | int r; |
50 | memcpy(&uts_table, table, sizeof(uts_table)); |
51 | uts_table.data = get_uts(table, write); |
52 | r = proc_dostring(&uts_table,write,buffer,lenp, ppos); |
53 | put_uts(table, write, uts_table.data); |
54 | return r; |
55 | } |
56 | #else |
57 | #define proc_do_uts_string NULL |
58 | #endif |
59 | |
60 | static struct ctl_table uts_kern_table[] = { |
61 | { |
62 | .procname = "ostype", |
63 | .data = init_uts_ns.name.sysname, |
64 | .maxlen = sizeof(init_uts_ns.name.sysname), |
65 | .mode = 0444, |
66 | .proc_handler = proc_do_uts_string, |
67 | }, |
68 | { |
69 | .procname = "osrelease", |
70 | .data = init_uts_ns.name.release, |
71 | .maxlen = sizeof(init_uts_ns.name.release), |
72 | .mode = 0444, |
73 | .proc_handler = proc_do_uts_string, |
74 | }, |
75 | { |
76 | .procname = "version", |
77 | .data = init_uts_ns.name.version, |
78 | .maxlen = sizeof(init_uts_ns.name.version), |
79 | .mode = 0444, |
80 | .proc_handler = proc_do_uts_string, |
81 | }, |
82 | { |
83 | .procname = "hostname", |
84 | .data = init_uts_ns.name.nodename, |
85 | .maxlen = sizeof(init_uts_ns.name.nodename), |
86 | .mode = 0644, |
87 | .proc_handler = proc_do_uts_string, |
88 | }, |
89 | { |
90 | .procname = "domainname", |
91 | .data = init_uts_ns.name.domainname, |
92 | .maxlen = sizeof(init_uts_ns.name.domainname), |
93 | .mode = 0644, |
94 | .proc_handler = proc_do_uts_string, |
95 | }, |
96 | {} |
97 | }; |
98 | |
99 | static struct ctl_table uts_root_table[] = { |
100 | { |
101 | .procname = "kernel", |
102 | .mode = 0555, |
103 | .child = uts_kern_table, |
104 | }, |
105 | {} |
106 | }; |
107 | |
108 | static int __init utsname_sysctl_init(void) |
109 | { |
110 | register_sysctl_table(uts_root_table); |
111 | return 0; |
112 | } |
113 | |
114 | __initcall(utsname_sysctl_init); |
115 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9