1 /*
2 * Copyright (C) 2007 IBM Corporation
3 *
4 * Author: Cedric Le Goater <clg@fr.ibm.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/nsproxy.h>
13 #include <linux/ipc_namespace.h>
14 #include <linux/sysctl.h>
15
16 /*
17 * Define the ranges various user-specified maximum values can
18 * be set to.
19 */
20 #define MIN_MSGMAX 1 /* min value for msg_max */
21 #define MAX_MSGMAX HARD_MSGMAX /* max value for msg_max */
22 #define MIN_MSGSIZEMAX 128 /* min value for msgsize_max */
23 #define MAX_MSGSIZEMAX (8192*128) /* max value for msgsize_max */
24
25 #ifdef CONFIG_PROC_SYSCTL
26 static void *get_mq(ctl_table *table)
27 {
28 char *which = table->data;
29 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
30 which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
31 return which;
32 }
33
34 static int proc_mq_dointvec(ctl_table *table, int write, struct file *filp,
35 void __user *buffer, size_t *lenp, loff_t *ppos)
36 {
37 struct ctl_table mq_table;
38 memcpy(&mq_table, table, sizeof(mq_table));
39 mq_table.data = get_mq(table);
40
41 return proc_dointvec(&mq_table, write, filp, buffer, lenp, ppos);
42 }
43
44 static int proc_mq_dointvec_minmax(ctl_table *table, int write,
45 struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
46 {
47 struct ctl_table mq_table;
48 memcpy(&mq_table, table, sizeof(mq_table));
49 mq_table.data = get_mq(table);
50
51 return proc_dointvec_minmax(&mq_table, write, filp, buffer,
52 lenp, ppos);
53 }
54 #else
55 #define proc_mq_dointvec NULL
56 #define proc_mq_dointvec_minmax NULL
57 #endif
58
59 static int msg_max_limit_min = MIN_MSGMAX;
60 static int msg_max_limit_max = MAX_MSGMAX;
61
62 static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
63 static int msg_maxsize_limit_max = MAX_MSGSIZEMAX;
64
65 static ctl_table mq_sysctls[] = {
66 {
67 .procname = "queues_max",
68 .data = &init_ipc_ns.mq_queues_max,
69 .maxlen = sizeof(int),
70 .mode = 0644,
71 .proc_handler = proc_mq_dointvec,
72 },
73 {
74 .procname = "msg_max",
75 .data = &init_ipc_ns.mq_msg_max,
76 .maxlen = sizeof(int),
77 .mode = 0644,
78 .proc_handler = proc_mq_dointvec_minmax,
79 .extra1 = &msg_max_limit_min,
80 .extra2 = &msg_max_limit_max,
81 },
82 {
83 .procname = "msgsize_max",
84 .data = &init_ipc_ns.mq_msgsize_max,
85 .maxlen = sizeof(int),
86 .mode = 0644,
87 .proc_handler = proc_mq_dointvec_minmax,
88 .extra1 = &msg_maxsize_limit_min,
89 .extra2 = &msg_maxsize_limit_max,
90 },
91 { .ctl_name = 0 }
92 };
93
94 static ctl_table mq_sysctl_dir[] = {
95 {
96 .procname = "mqueue",
97 .mode = 0555,
98 .child = mq_sysctls,
99 },
100 { .ctl_name = 0 }
101 };
102
103 static ctl_table mq_sysctl_root[] = {
104 {
105 .ctl_name = CTL_FS,
106 .procname = "fs",
107 .mode = 0555,
108 .child = mq_sysctl_dir,
109 },
110 { .ctl_name = 0 }
111 };
112
113 struct ctl_table_header *mq_register_sysctl_table(void)
114 {
115 return register_sysctl_table(mq_sysctl_root);
116 }
117
|
This page was automatically generated by the
LXR engine.
|