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namespaces: mqueue namespace: adapt sysctl
Largely inspired from ipc/ipc_sysctl.c. This patch isolates the mqueue sysctl stuff in its own file. [[email protected]: build fix] Signed-off-by: Cedric Le Goater <[email protected]> Signed-off-by: Nadia Derbey <[email protected]> Signed-off-by: Serge E. Hallyn <[email protected]> Cc: Alexey Dobriyan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* | ||
| * Copyright (C) 2007 IBM Corporation | ||
| * | ||
| * Author: Cedric Le Goater <[email protected]> | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License as | ||
| * published by the Free Software Foundation, version 2 of the | ||
| * License. | ||
| */ | ||
|
|
||
| #include <linux/nsproxy.h> | ||
| #include <linux/ipc_namespace.h> | ||
| #include <linux/sysctl.h> | ||
|
|
||
| /* | ||
| * Define the ranges various user-specified maximum values can | ||
| * be set to. | ||
| */ | ||
| #define MIN_MSGMAX 1 /* min value for msg_max */ | ||
| #define MAX_MSGMAX HARD_MSGMAX /* max value for msg_max */ | ||
| #define MIN_MSGSIZEMAX 128 /* min value for msgsize_max */ | ||
| #define MAX_MSGSIZEMAX (8192*128) /* max value for msgsize_max */ | ||
|
|
||
| static void *get_mq(ctl_table *table) | ||
| { | ||
| char *which = table->data; | ||
| struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; | ||
| which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns; | ||
| return which; | ||
| } | ||
|
|
||
| #ifdef CONFIG_PROC_SYSCTL | ||
| static int proc_mq_dointvec(ctl_table *table, int write, struct file *filp, | ||
| void __user *buffer, size_t *lenp, loff_t *ppos) | ||
| { | ||
| struct ctl_table mq_table; | ||
| memcpy(&mq_table, table, sizeof(mq_table)); | ||
| mq_table.data = get_mq(table); | ||
|
|
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| return proc_dointvec(&mq_table, write, filp, buffer, lenp, ppos); | ||
| } | ||
|
|
||
| static int proc_mq_dointvec_minmax(ctl_table *table, int write, | ||
| struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos) | ||
| { | ||
| struct ctl_table mq_table; | ||
| memcpy(&mq_table, table, sizeof(mq_table)); | ||
| mq_table.data = get_mq(table); | ||
|
|
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| return proc_dointvec_minmax(&mq_table, write, filp, buffer, | ||
| lenp, ppos); | ||
| } | ||
| #else | ||
| #define proc_mq_dointvec NULL | ||
| #define proc_mq_dointvec_minmax NULL | ||
| #endif | ||
|
|
||
| static int msg_max_limit_min = MIN_MSGMAX; | ||
| static int msg_max_limit_max = MAX_MSGMAX; | ||
|
|
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| static int msg_maxsize_limit_min = MIN_MSGSIZEMAX; | ||
| static int msg_maxsize_limit_max = MAX_MSGSIZEMAX; | ||
|
|
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| static ctl_table mq_sysctls[] = { | ||
| { | ||
| .procname = "queues_max", | ||
| .data = &init_ipc_ns.mq_queues_max, | ||
| .maxlen = sizeof(int), | ||
| .mode = 0644, | ||
| .proc_handler = proc_mq_dointvec, | ||
| }, | ||
| { | ||
| .procname = "msg_max", | ||
| .data = &init_ipc_ns.mq_msg_max, | ||
| .maxlen = sizeof(int), | ||
| .mode = 0644, | ||
| .proc_handler = proc_mq_dointvec_minmax, | ||
| .extra1 = &msg_max_limit_min, | ||
| .extra2 = &msg_max_limit_max, | ||
| }, | ||
| { | ||
| .procname = "msgsize_max", | ||
| .data = &init_ipc_ns.mq_msgsize_max, | ||
| .maxlen = sizeof(int), | ||
| .mode = 0644, | ||
| .proc_handler = proc_mq_dointvec_minmax, | ||
| .extra1 = &msg_maxsize_limit_min, | ||
| .extra2 = &msg_maxsize_limit_max, | ||
| }, | ||
| { .ctl_name = 0 } | ||
| }; | ||
|
|
||
| static ctl_table mq_sysctl_dir[] = { | ||
| { | ||
| .procname = "mqueue", | ||
| .mode = 0555, | ||
| .child = mq_sysctls, | ||
| }, | ||
| { .ctl_name = 0 } | ||
| }; | ||
|
|
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| static ctl_table mq_sysctl_root[] = { | ||
| { | ||
| .ctl_name = CTL_FS, | ||
| .procname = "fs", | ||
| .mode = 0555, | ||
| .child = mq_sysctl_dir, | ||
| }, | ||
| { .ctl_name = 0 } | ||
| }; | ||
|
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| struct ctl_table_header *mq_register_sysctl_table(void) | ||
| { | ||
| return register_sysctl_table(mq_sysctl_root); | ||
| } |
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