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Source at commit fbf123cd4cc0c097fe9a99c90109ebb2a5e94a50 created 10 years 3 months ago. By Lars-Peter Clausen, dma: jz4740: Dequeue descriptor from active list before completing it | |
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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/export.h> |
13 | #include <linux/uts.h> |
14 | #include <linux/utsname.h> |
15 | #include <linux/sysctl.h> |
16 | #include <linux/wait.h> |
17 | |
18 | #ifdef CONFIG_PROC_SYSCTL |
19 | |
20 | static void *get_uts(struct ctl_table *table, int write) |
21 | { |
22 | char *which = table->data; |
23 | struct uts_namespace *uts_ns; |
24 | |
25 | uts_ns = current->nsproxy->uts_ns; |
26 | which = (which - (char *)&init_uts_ns) + (char *)uts_ns; |
27 | |
28 | if (!write) |
29 | down_read(&uts_sem); |
30 | else |
31 | down_write(&uts_sem); |
32 | return which; |
33 | } |
34 | |
35 | static void put_uts(struct ctl_table *table, int write, void *which) |
36 | { |
37 | if (!write) |
38 | up_read(&uts_sem); |
39 | else |
40 | up_write(&uts_sem); |
41 | } |
42 | |
43 | /* |
44 | * Special case of dostring for the UTS structure. This has locks |
45 | * to observe. Should this be in kernel/sys.c ???? |
46 | */ |
47 | static int proc_do_uts_string(struct ctl_table *table, int write, |
48 | void __user *buffer, size_t *lenp, loff_t *ppos) |
49 | { |
50 | struct ctl_table uts_table; |
51 | int r; |
52 | memcpy(&uts_table, table, sizeof(uts_table)); |
53 | uts_table.data = get_uts(table, write); |
54 | r = proc_dostring(&uts_table, write, buffer, lenp, ppos); |
55 | put_uts(table, write, uts_table.data); |
56 | |
57 | if (write) |
58 | proc_sys_poll_notify(table->poll); |
59 | |
60 | return r; |
61 | } |
62 | #else |
63 | #define proc_do_uts_string NULL |
64 | #endif |
65 | |
66 | static DEFINE_CTL_TABLE_POLL(hostname_poll); |
67 | static DEFINE_CTL_TABLE_POLL(domainname_poll); |
68 | |
69 | static struct ctl_table uts_kern_table[] = { |
70 | { |
71 | .procname = "ostype", |
72 | .data = init_uts_ns.name.sysname, |
73 | .maxlen = sizeof(init_uts_ns.name.sysname), |
74 | .mode = 0444, |
75 | .proc_handler = proc_do_uts_string, |
76 | }, |
77 | { |
78 | .procname = "osrelease", |
79 | .data = init_uts_ns.name.release, |
80 | .maxlen = sizeof(init_uts_ns.name.release), |
81 | .mode = 0444, |
82 | .proc_handler = proc_do_uts_string, |
83 | }, |
84 | { |
85 | .procname = "version", |
86 | .data = init_uts_ns.name.version, |
87 | .maxlen = sizeof(init_uts_ns.name.version), |
88 | .mode = 0444, |
89 | .proc_handler = proc_do_uts_string, |
90 | }, |
91 | { |
92 | .procname = "hostname", |
93 | .data = init_uts_ns.name.nodename, |
94 | .maxlen = sizeof(init_uts_ns.name.nodename), |
95 | .mode = 0644, |
96 | .proc_handler = proc_do_uts_string, |
97 | .poll = &hostname_poll, |
98 | }, |
99 | { |
100 | .procname = "domainname", |
101 | .data = init_uts_ns.name.domainname, |
102 | .maxlen = sizeof(init_uts_ns.name.domainname), |
103 | .mode = 0644, |
104 | .proc_handler = proc_do_uts_string, |
105 | .poll = &domainname_poll, |
106 | }, |
107 | {} |
108 | }; |
109 | |
110 | static struct ctl_table uts_root_table[] = { |
111 | { |
112 | .procname = "kernel", |
113 | .mode = 0555, |
114 | .child = uts_kern_table, |
115 | }, |
116 | {} |
117 | }; |
118 | |
119 | #ifdef CONFIG_PROC_SYSCTL |
120 | /* |
121 | * Notify userspace about a change in a certain entry of uts_kern_table, |
122 | * identified by the parameter proc. |
123 | */ |
124 | void uts_proc_notify(enum uts_proc proc) |
125 | { |
126 | struct ctl_table *table = &uts_kern_table[proc]; |
127 | |
128 | proc_sys_poll_notify(table->poll); |
129 | } |
130 | #endif |
131 | |
132 | static int __init utsname_sysctl_init(void) |
133 | { |
134 | register_sysctl_table(uts_root_table); |
135 | return 0; |
136 | } |
137 | |
138 | device_initcall(utsname_sysctl_init); |
139 |
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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