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authorSerge E. Hallyn <serue@us.ibm.com>2009-04-06 22:01:11 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 11:31:09 -0400
commitbdc8e5f85f9abe2e7c78dcf39d81f9a97178788b (patch)
treea25a9d10f3686c4cb309d2477376ee585322ef43 /ipc/mq_sysctl.c
parent7eafd7c74c3f2e67c27621b987b28397110d643f (diff)
namespaces: mqueue namespace: adapt sysctl
Largely inspired from ipc/ipc_sysctl.c. This patch isolates the mqueue sysctl stuff in its own file. [akpm@linux-foundation.org: build fix] Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net> Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/mq_sysctl.c')
-rw-r--r--ipc/mq_sysctl.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/ipc/mq_sysctl.c b/ipc/mq_sysctl.c
new file mode 100644
index 000000000000..89f60ec8ee54
--- /dev/null
+++ b/ipc/mq_sysctl.c
@@ -0,0 +1,116 @@
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
25static void *get_mq(ctl_table *table)
26{
27 char *which = table->data;
28 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
29 which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
30 return which;
31}
32
33#ifdef CONFIG_PROC_SYSCTL
34static 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
44static 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
59static int msg_max_limit_min = MIN_MSGMAX;
60static int msg_max_limit_max = MAX_MSGMAX;
61
62static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
63static int msg_maxsize_limit_max = MAX_MSGSIZEMAX;
64
65static 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
94static ctl_table mq_sysctl_dir[] = {
95 {
96 .procname = "mqueue",
97 .mode = 0555,
98 .child = mq_sysctls,
99 },
100 { .ctl_name = 0 }
101};
102
103static 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
113struct ctl_table_header *mq_register_sysctl_table(void)
114{
115 return register_sysctl_table(mq_sysctl_root);
116}