[GitHub/mt8127/android_kernel_alcatel_ttab.git] / ipc / namespace.c

/*
 * linux/ipc/namespace.c
 * Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc.
 */

#include <linux/ipc.h>
#include <linux/msg.h>
#include <linux/ipc_namespace.h>
#include <linux/rcupdate.h>
#include <linux/nsproxy.h>
#include <linux/slab.h>

#include "util.h"

static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
{
	struct ipc_namespace *ns;

	ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
	if (ns == NULL)
		return ERR_PTR(-ENOMEM);

	atomic_inc(&nr_ipc_ns);

	sem_init_ns(ns);
	msg_init_ns(ns);
	shm_init_ns(ns);

	/*
	 * msgmni has already been computed for the new ipc ns.
	 * Thus, do the ipcns creation notification before registering that
	 * new ipcns in the chain.
	 */
	ipcns_notify(IPCNS_CREATED);
	register_ipcns_notifier(ns);

	kref_init(&ns->kref);
	return ns;
}

struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns)
{
	struct ipc_namespace *new_ns;

	BUG_ON(!ns);
	get_ipc_ns(ns);

	if (!(flags & CLONE_NEWIPC))
		return ns;

	new_ns = clone_ipc_ns(ns);

	put_ipc_ns(ns);
	return new_ns;
}

/*
 * free_ipcs - free all ipcs of one type
 * @ns:   the namespace to remove the ipcs from
 * @ids:  the table of ipcs to free
 * @free: the function called to free each individual ipc
 *
 * Called for each kind of ipc when an ipc_namespace exits.
 */
void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
	       void (*free)(struct ipc_namespace *, struct kern_ipc_perm *))
{
	struct kern_ipc_perm *perm;
	int next_id;
	int total, in_use;

	down_write(&ids->rw_mutex);

	in_use = ids->in_use;

	for (total = 0, next_id = 0; total < in_use; next_id++) {
		perm = idr_find(&ids->ipcs_idr, next_id);
		if (perm == NULL)
			continue;
		ipc_lock_by_ptr(perm);
		free(ns, perm);
		total++;
	}
	up_write(&ids->rw_mutex);
}

void free_ipc_ns(struct kref *kref)
{
	struct ipc_namespace *ns;

	ns = container_of(kref, struct ipc_namespace, kref);
	/*
	 * Unregistering the hotplug notifier at the beginning guarantees
	 * that the ipc namespace won't be freed while we are inside the
	 * callback routine. Since the blocking_notifier_chain_XXX routines
	 * hold a rw lock on the notifier list, unregister_ipcns_notifier()
	 * won't take the rw lock before blocking_notifier_call_chain() has
	 * released the rd lock.
	 */
	unregister_ipcns_notifier(ns);
	sem_exit_ns(ns);
	msg_exit_ns(ns);
	shm_exit_ns(ns);
	kfree(ns);
	atomic_dec(&nr_ipc_ns);

	/*
	 * Do the ipcns removal notification after decrementing nr_ipc_ns in
	 * order to have a correct value when recomputing msgmni.
	 */
	ipcns_notify(IPCNS_REMOVED);
}
Commit	Line	Data
ae5e1b22 PE	1	/*
	2	* linux/ipc/namespace.c
	3	* Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc.
	4	*/
	5
	6	#include <linux/ipc.h>
	7	#include <linux/msg.h>
	8	#include <linux/ipc_namespace.h>
	9	#include <linux/rcupdate.h>
	10	#include <linux/nsproxy.h>
	11	#include <linux/slab.h>
	12
	13	#include "util.h"
	14
	15	static struct ipc_namespace clone_ipc_ns(struct ipc_namespace old_ns)
	16	{
ae5e1b22 PE	17	struct ipc_namespace *ns;
ae5e1b22 PE	18
ae5e1b22 PE	19	ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
ae5e1b22 PE	20	if (ns == NULL)
ed2ddbf8	21	return ERR_PTR(-ENOMEM);
ae5e1b22	22
4d89dc6a ND	23	atomic_inc(&nr_ipc_ns);
4d89dc6a ND	24
ed2ddbf8 PP	25	sem_init_ns(ns);
	26	msg_init_ns(ns);
	27	shm_init_ns(ns);
ae5e1b22	28
e2c284d8 ND	29	/*
	30	* msgmni has already been computed for the new ipc ns.
	31	* Thus, do the ipcns creation notification before registering that
	32	* new ipcns in the chain.
	33	*/
	34	ipcns_notify(IPCNS_CREATED);
b6b337ad ND	35	register_ipcns_notifier(ns);
b6b337ad ND	36
ae5e1b22 PE	37	kref_init(&ns->kref);
ae5e1b22 PE	38	return ns;
ae5e1b22 PE	39	}
	40
	41	struct ipc_namespace copy_ipcs(unsigned long flags, struct ipc_namespace ns)
	42	{
	43	struct ipc_namespace *new_ns;
	44
	45	BUG_ON(!ns);
	46	get_ipc_ns(ns);
	47
	48	if (!(flags & CLONE_NEWIPC))
	49	return ns;
	50
	51	new_ns = clone_ipc_ns(ns);
	52
	53	put_ipc_ns(ns);
	54	return new_ns;
	55	}
	56
01b8b07a PP	57	/*
	58	* free_ipcs - free all ipcs of one type
	59	* @ns: the namespace to remove the ipcs from
	60	* @ids: the table of ipcs to free
	61	* @free: the function called to free each individual ipc
	62	*
	63	* Called for each kind of ipc when an ipc_namespace exits.
	64	*/
	65	void free_ipcs(struct ipc_namespace ns, struct ipc_ids ids,
	66	void (free)(struct ipc_namespace , struct kern_ipc_perm *))
	67	{
	68	struct kern_ipc_perm *perm;
	69	int next_id;
	70	int total, in_use;
	71
	72	down_write(&ids->rw_mutex);
	73
	74	in_use = ids->in_use;
	75
	76	for (total = 0, next_id = 0; total < in_use; next_id++) {
	77	perm = idr_find(&ids->ipcs_idr, next_id);
	78	if (perm == NULL)
	79	continue;
	80	ipc_lock_by_ptr(perm);
	81	free(ns, perm);
	82	total++;
	83	}
	84	up_write(&ids->rw_mutex);
	85	}
	86
ae5e1b22 PE	87	void free_ipc_ns(struct kref *kref)
	88	{
	89	struct ipc_namespace *ns;
	90
	91	ns = container_of(kref, struct ipc_namespace, kref);
b6b337ad ND	92	/*
	93	* Unregistering the hotplug notifier at the beginning guarantees
	94	* that the ipc namespace won't be freed while we are inside the
	95	* callback routine. Since the blocking_notifier_chain_XXX routines
	96	* hold a rw lock on the notifier list, unregister_ipcns_notifier()
	97	* won't take the rw lock before blocking_notifier_call_chain() has
	98	* released the rd lock.
	99	*/
	100	unregister_ipcns_notifier(ns);
ae5e1b22 PE	101	sem_exit_ns(ns);
	102	msg_exit_ns(ns);
	103	shm_exit_ns(ns);
	104	kfree(ns);
4d89dc6a	105	atomic_dec(&nr_ipc_ns);
e2c284d8 ND	106
	107	/*
	108	* Do the ipcns removal notification after decrementing nr_ipc_ns in
	109	* order to have a correct value when recomputing msgmni.
	110	*/
	111	ipcns_notify(IPCNS_REMOVED);
ae5e1b22	112	}