[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / include / linux / nsproxy.h

#ifndef _LINUX_NSPROXY_H
#define _LINUX_NSPROXY_H

#include <linux/spinlock.h>
#include <linux/sched.h>

struct mnt_namespace;
struct uts_namespace;
struct ipc_namespace;
struct pid_namespace;

/*
 * A structure to contain pointers to all per-process
 * namespaces - fs (mount), uts, network, sysvipc, etc.
 *
 * 'count' is the number of tasks holding a reference.
 * The count for each namespace, then, will be the number
 * of nsproxies pointing to it, not the number of tasks.
 *
 * The nsproxy is shared by tasks which share all namespaces.
 * As soon as a single namespace is cloned or unshared, the
 * nsproxy is copied.
 */
struct nsproxy {
	atomic_t count;
	spinlock_t nslock;
	struct uts_namespace *uts_ns;
	struct ipc_namespace *ipc_ns;
	struct mnt_namespace *mnt_ns;
	struct pid_namespace *pid_ns;
};
extern struct nsproxy init_nsproxy;

struct nsproxy *dup_namespaces(struct nsproxy *orig);
int copy_namespaces(int flags, struct task_struct *tsk);
void get_task_namespaces(struct task_struct *tsk);
void free_nsproxy(struct nsproxy *ns);
struct nsproxy *put_nsproxy(struct nsproxy *ns);

static inline void finalize_put_nsproxy(struct nsproxy *ns)
{
	if (ns)
		free_nsproxy(ns);
}

static inline void put_and_finalize_nsproxy(struct nsproxy *ns)
{
	finalize_put_nsproxy(put_nsproxy(ns));
}

static inline struct nsproxy *preexit_task_namespaces(struct task_struct *p)
{
	return put_nsproxy(p->nsproxy);
}

static inline void exit_task_namespaces(struct task_struct *p,
						struct nsproxy *ns)
{
	task_lock(p);
	p->nsproxy = NULL;
	task_unlock(p);
	finalize_put_nsproxy(ns);
}
#endif
Commit	Line	Data
ab516013 SH	1	#ifndef _LINUX_NSPROXY_H
	2	#define _LINUX_NSPROXY_H
	3
	4	#include <linux/spinlock.h>
	5	#include <linux/sched.h>
	6
6b3286ed	7	struct mnt_namespace;
4865ecf1	8	struct uts_namespace;
25b21cb2	9	struct ipc_namespace;
9a575a92	10	struct pid_namespace;
1651e14e	11
ab516013 SH	12	/*
	13	* A structure to contain pointers to all per-process
	14	* namespaces - fs (mount), uts, network, sysvipc, etc.
	15	*
	16	* 'count' is the number of tasks holding a reference.
	17	* The count for each namespace, then, will be the number
	18	* of nsproxies pointing to it, not the number of tasks.
	19	*
	20	* The nsproxy is shared by tasks which share all namespaces.
	21	* As soon as a single namespace is cloned or unshared, the
	22	* nsproxy is copied.
	23	*/
	24	struct nsproxy {
	25	atomic_t count;
	26	spinlock_t nslock;
4865ecf1	27	struct uts_namespace *uts_ns;
25b21cb2	28	struct ipc_namespace *ipc_ns;
6b3286ed	29	struct mnt_namespace *mnt_ns;
9a575a92	30	struct pid_namespace *pid_ns;
ab516013 SH	31	};
	32	extern struct nsproxy init_nsproxy;
	33
	34	struct nsproxy dup_namespaces(struct nsproxy orig);
	35	int copy_namespaces(int flags, struct task_struct *tsk);
	36	void get_task_namespaces(struct task_struct *tsk);
	37	void free_nsproxy(struct nsproxy *ns);
7a238fcb	38	struct nsproxy put_nsproxy(struct nsproxy ns);
ab516013	39
7a238fcb	40	static inline void finalize_put_nsproxy(struct nsproxy *ns)
ab516013	41	{
7a238fcb	42	if (ns)
ab516013	43	free_nsproxy(ns);
ab516013 SH	44	}
ab516013 SH	45
7a238fcb	46	static inline void put_and_finalize_nsproxy(struct nsproxy *ns)
ab516013	47	{
7a238fcb SH	48	finalize_put_nsproxy(put_nsproxy(ns));
	49	}
	50
	51	static inline struct nsproxy preexit_task_namespaces(struct task_struct p)
	52	{
	53	return put_nsproxy(p->nsproxy);
	54	}
	55
	56	static inline void exit_task_namespaces(struct task_struct *p,
	57	struct nsproxy *ns)
	58	{
	59	task_lock(p);
	60	p->nsproxy = NULL;
	61	task_unlock(p);
	62	finalize_put_nsproxy(ns);
ab516013 SH	63	}
ab516013 SH	64	#endif