<commit_before>/*
 * linux/ipc/util.c
 * Copyright (C) 1992 <NAME>
 *
 * Sep 1997 - Call suser() last after "normal" permission checks so we
 *            get BSD style process accounting right.
 *            Occurs in several places in the IPC code.
 *            <NAME>, <<EMAIL>>
 * Nov 1999 - ipc helper functions, unified SMP locking
 *	      <NAME> <<EMAIL>>
 * Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary().
 *            <NAME> <<EMAIL>>
 * Mar 2006 - support for audit of ipc object properties
 *            <NAME> <<EMAIL>>
 * Jun 2006 - namespaces ssupport
 *            OpenVZ, SWsoft Inc.
 *            <NAME> <<EMAIL>>
 */

#include <linux/mm.h>
#include <linux/shm.h>
#include <linux/init.h>
#include <linux/msg.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/capability.h>
#include <linux/highuid.h>
#include <linux/security.h>
#include <linux/rcupdate.h>
#include <linux/workqueue.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/audit.h>
#include <linux/nsproxy.h>
#include <linux/rwsem.h>
#include <linux/memory.h>
#include <linux/ipc_namespace.h>

#include <asm/unistd.h>

#include "util.h"

struct ipc_proc_iface {
	const char *path;
	const char *header;
	int ids;
	int (*show)(struct seq_file *, void *);
};

#ifdef CONFIG_MEMORY_HOTPLUG

static void ipc_memory_notifier(struct work_struct *work)
{
	ipcns_notify(IPCNS_MEMCHANGED);
}

static DECLARE_WORK(ipc_memory_wq, ipc_memory_notifier);


static int ipc_memory_callback(struct notifier_block *self,
				unsigned long action, void *arg)
{
	switch (action) {
	case MEM_ONLINE:    /* memory successfully brought online */
	case MEM_OFFLINE:   /* or offline: it's time to recompute msgmni */
		/*
		 * This is done by invoking the ipcns notifier chain with the
		 * IPC_MEMCHANGED event.
		 * In order not to keep the lock on the hotplug memory chain
		 * for too long, queue a work item that will, when waken up,
		 * activate the ipcns notification chain.
		 * No need to keep several ipc work items on the queue.
		 */
		if (!work_pending(&ipc_memory_wq))
			schedule_work(&ipc_memory_wq);
		break;
	case MEM_GOING_ONLINE:
	case MEM_GOING_OFFLINE:
	case MEM_CANCEL_ONLINE:
	case MEM_CANCEL_OFFLINE:
	default:
		break;
	}

	return NOTIFY_OK;
}

#endif /* CONFIG_MEMORY_HOTPLUG */

/**
 *	ipc_init	-	initialise IPC subsystem
 *
 *	The various system5 IPC resources (semaphores, messages and shared
 *	memory) are initialised
 *	A callback routine is registered into the memory hotplug notifier
 *	chain: since msgmni scales to lowmem this callback routine will be
 *	called upon successful memory add / remove to recompute msmgni.
 */
 
static int __init ipc_init(void)
{
	sem_init();
	msg_init();
	shm_init();
	hotplug_memory_notifier(ipc_memory_callback, IPC_CALLBACK_PRI);
	register_ipcns_notifier(&init_ipc_ns);
	return 0;
}
__initcall(ipc_init);

/**
 *	ipc_init_ids		-	initialise IPC identifiers
 *	@ids: Identifier set
 *
 *	Set up the sequence range to use for the ipc identifier range (limited
 *	below IPCMNI) then initialise the ids idr.
 */
 
void ipc_init_ids(struct ipc_ids *ids)
{
	init_rwsem(&ids->rw_mutex);

	ids->in_use = 0;
	ids->seq = 0;
	ids->next_id = -1;
	{<commit_msg>ipc/util.c: use register_hotmemory_notifier()<commit_after>/*
 * linux/ipc/util.c
 * Copyright (C) 1992 <NAME>
 *
 * Sep 1997 - Call suser() last after "normal" permission checks so we
 *            get BSD style process accounting right.
 *            Occurs in several places in the IPC code.
 *            <NAME>, <<EMAIL>>
 * Nov 1999 - ipc helper functions, unified SMP locking
 *	      <NAME> <<EMAIL>>
 * Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary().
 *            <NAME> <<EMAIL>>
 * Mar 2006 - support for audit of ipc object properties
 *            <NAME> <<EMAIL>>
 * Jun 2006 - namespaces ssupport
 *            OpenVZ, SWsoft Inc.
 *            <NAME> <<EMAIL>>
 */

#include <linux/mm.h>
#include <linux/shm.h>
#include <linux/init.h>
#include <linux/msg.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/capability.h>
#include <linux/highuid.h>
#include <linux/security.h>
#include <linux/rcupdate.h>
#include <linux/workqueue.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/audit.h>
#include <linux/nsproxy.h>
#include <linux/rwsem.h>
#include <linux/memory.h>
#include <linux/ipc_namespace.h>

#include <asm/unistd.h>

#include "util.h"

struct ipc_proc_iface {
	const char *path;
	const char *header;
	int ids;
	int (*show)(struct seq_file *, void *);
};

static void ipc_memory_notifier(struct work_struct *work)
{
	ipcns_notify(IPCNS_MEMCHANGED);
}

static int ipc_memory_callback(struct notifier_block *self,
				unsigned long action, void *arg)
{
	static DECLARE_WORK(ipc_memory_wq, ipc_memory_notifier);

	switch (action) {
	case MEM_ONLINE:    /* memory successfully brought online */
	case MEM_OFFLINE:   /* or offline: it's time to recompute msgmni */
		/*
		 * This is done by invoking the ipcns notifier chain with the
		 * IPC_MEMCHANGED event.
		 * In order not to keep the lock on the hotplug memory chain
		 * for too long, queue a work item that will, when waken up,
		 * activate the ipcns notification chain.
		 * No need to keep several ipc work items on the queue.
		 */
		if (!work_pending(&ipc_memory_wq))
			schedule_work(&ipc_memory_wq);
		break;
	case MEM_GOING_ONLINE:
	case MEM_GOING_OFFLINE:
	case MEM_CANCEL_ONLINE:
	case MEM_CANCEL_OFFLINE:
	default:
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block ipc_memory_nb = {
	.notifier_call = ipc_memory_callback,
	.priority = IPC_CALLBACK_PRI,
};

/**
 *	ipc_init	-	initialise IPC subsystem
 *
 *	The various system5 IPC resources (semaphores, messages and shared
 *	memory) are initialised
 *	A callback routine is registered into the memory hotplug notifier
 *	chain: since msgmni scales to lowmem this callback routine will be
 *	called upon successful memory add / remove to recompute msmgni.
 */
 
static int __init ipc_init(void)
{
	sem_init();
	msg_init();
	shm_init();
	register_hotmemory_notifier(&ipc_memory_nb);
	register_ipcns_notifier(&init_ipc_ns);
	return 0;
}
__initcall(ipc_init);

/**
 *	ipc_init_ids		-	initialise IPC identifiers
 *	@ids: Identifier set
 *
 *	Set up the sequence range to use for the ipc identifier range (limited
 *	below IPCMNI) then initialise the ids idr.
 */
 
void ipc_init_ids(struct ipc_ids *ids)
{
	init_rwsem(&ids->rw_mutex);

	ids->in_use = 0;
	ids->seq = 0;
	ids->next_id = -1;
	{
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