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>
This commit is contained in:
Serge E. Hallyn
Linus Torvalds
parent
7eafd7c74c
commit
bdc8e5f85f
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@ -128,4 +128,18 @@ static inline void put_ipc_ns(struct ipc_namespace *ns)
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{
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}
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#endif
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#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
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struct ctl_table_header;
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extern struct ctl_table_header *mq_register_sysctl_table(void);
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#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
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static inline struct ctl_table_header *mq_register_sysctl_table(void)
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{
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return NULL;
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}
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#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
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#endif
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@ -208,6 +208,12 @@ config POSIX_MQUEUE
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If unsure, say Y.
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config POSIX_MQUEUE_SYSCTL
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bool
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depends on POSIX_MQUEUE
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depends on SYSCTL
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default y
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config BSD_PROCESS_ACCT
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bool "BSD Process Accounting"
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help
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@ -8,4 +8,5 @@ obj-$(CONFIG_SYSVIPC_SYSCTL) += ipc_sysctl.o
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obj_mq-$(CONFIG_COMPAT) += compat_mq.o
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obj-$(CONFIG_POSIX_MQUEUE) += mqueue.o msgutil.o $(obj_mq-y)
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obj-$(CONFIG_IPC_NS) += namespace.o
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obj-$(CONFIG_POSIX_MQUEUE_SYSCTL) += mq_sysctl.o
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@ -0,0 +1,116 @@
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/*
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* Copyright (C) 2007 IBM Corporation
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*
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* Author: Cedric Le Goater <clg@fr.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include <linux/nsproxy.h>
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#include <linux/ipc_namespace.h>
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#include <linux/sysctl.h>
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/*
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* Define the ranges various user-specified maximum values can
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* be set to.
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*/
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#define MIN_MSGMAX 1 /* min value for msg_max */
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#define MAX_MSGMAX HARD_MSGMAX /* max value for msg_max */
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#define MIN_MSGSIZEMAX 128 /* min value for msgsize_max */
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#define MAX_MSGSIZEMAX (8192*128) /* max value for msgsize_max */
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static void *get_mq(ctl_table *table)
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{
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char *which = table->data;
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struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
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which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
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return which;
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}
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#ifdef CONFIG_PROC_SYSCTL
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static int proc_mq_dointvec(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table mq_table;
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memcpy(&mq_table, table, sizeof(mq_table));
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mq_table.data = get_mq(table);
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return proc_dointvec(&mq_table, write, filp, buffer, lenp, ppos);
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}
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static int proc_mq_dointvec_minmax(ctl_table *table, int write,
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struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table mq_table;
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memcpy(&mq_table, table, sizeof(mq_table));
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mq_table.data = get_mq(table);
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return proc_dointvec_minmax(&mq_table, write, filp, buffer,
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lenp, ppos);
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}
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#else
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#define proc_mq_dointvec NULL
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#define proc_mq_dointvec_minmax NULL
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#endif
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static int msg_max_limit_min = MIN_MSGMAX;
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static int msg_max_limit_max = MAX_MSGMAX;
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static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
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static int msg_maxsize_limit_max = MAX_MSGSIZEMAX;
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static ctl_table mq_sysctls[] = {
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{
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.procname = "queues_max",
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.data = &init_ipc_ns.mq_queues_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_mq_dointvec,
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},
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{
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.procname = "msg_max",
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.data = &init_ipc_ns.mq_msg_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_mq_dointvec_minmax,
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.extra1 = &msg_max_limit_min,
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.extra2 = &msg_max_limit_max,
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},
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{
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.procname = "msgsize_max",
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.data = &init_ipc_ns.mq_msgsize_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_mq_dointvec_minmax,
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.extra1 = &msg_maxsize_limit_min,
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.extra2 = &msg_maxsize_limit_max,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table mq_sysctl_dir[] = {
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{
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.procname = "mqueue",
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.mode = 0555,
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.child = mq_sysctls,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table mq_sysctl_root[] = {
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{
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.ctl_name = CTL_FS,
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.procname = "fs",
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.mode = 0555,
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.child = mq_sysctl_dir,
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},
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{ .ctl_name = 0 }
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};
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struct ctl_table_header *mq_register_sysctl_table(void)
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{
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return register_sysctl_table(mq_sysctl_root);
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}
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65
ipc/mqueue.c
65
ipc/mqueue.c
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@ -47,15 +47,6 @@
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#define STATE_PENDING 1
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#define STATE_READY 2
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/*
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* Define the ranges various user-specified maximum values can
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* be set to.
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*/
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#define MIN_MSGMAX 1 /* min value for msg_max */
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#define MAX_MSGMAX HARD_MSGMAX /* max value for msg_max */
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#define MIN_MSGSIZEMAX 128 /* min value for msgsize_max */
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#define MAX_MSGSIZEMAX (8192*128) /* max value for msgsize_max */
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struct ext_wait_queue { /* queue of sleeping tasks */
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struct task_struct *task;
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struct list_head list;
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@ -1271,60 +1262,6 @@ void mq_put_mnt(struct ipc_namespace *ns)
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mntput(ns->mq_mnt);
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}
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static int msg_max_limit_min = MIN_MSGMAX;
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static int msg_max_limit_max = MAX_MSGMAX;
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static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
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static int msg_maxsize_limit_max = MAX_MSGSIZEMAX;
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static ctl_table mq_sysctls[] = {
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{
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.procname = "queues_max",
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.data = &init_ipc_ns.mq_queues_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.procname = "msg_max",
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.data = &init_ipc_ns.mq_msg_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.extra1 = &msg_max_limit_min,
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.extra2 = &msg_max_limit_max,
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},
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{
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.procname = "msgsize_max",
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.data = &init_ipc_ns.mq_msgsize_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.extra1 = &msg_maxsize_limit_min,
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.extra2 = &msg_maxsize_limit_max,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table mq_sysctl_dir[] = {
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{
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.procname = "mqueue",
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.mode = 0555,
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.child = mq_sysctls,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table mq_sysctl_root[] = {
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{
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.ctl_name = CTL_FS,
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.procname = "fs",
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.mode = 0555,
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.child = mq_sysctl_dir,
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},
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{ .ctl_name = 0 }
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};
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static int __init init_mqueue_fs(void)
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{
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int error;
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@ -1336,7 +1273,7 @@ static int __init init_mqueue_fs(void)
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return -ENOMEM;
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/* ignore failues - they are not fatal */
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mq_sysctl_table = register_sysctl_table(mq_sysctl_root);
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mq_sysctl_table = mq_register_sysctl_table();
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error = register_filesystem(&mqueue_fs_type);
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if (error)
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