Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _LINUX_NSPROXY_H
2#define _LINUX_NSPROXY_H
3
4#include <linux/spinlock.h>
5#include <linux/sched.h>
6
7struct namespace;
8struct uts_namespace;
9struct ipc_namespace;
10
11/*
12 * A structure to contain pointers to all per-process
13 * namespaces - fs (mount), uts, network, sysvipc, etc.
14 *
15 * 'count' is the number of tasks holding a reference.
16 * The count for each namespace, then, will be the number
17 * of nsproxies pointing to it, not the number of tasks.
18 *
19 * The nsproxy is shared by tasks which share all namespaces.
20 * As soon as a single namespace is cloned or unshared, the
21 * nsproxy is copied.
22 */
23struct nsproxy {
24 atomic_t count;
25 spinlock_t nslock;
26 struct uts_namespace *uts_ns;
27 struct ipc_namespace *ipc_ns;
28 struct namespace *namespace;
29};
30extern struct nsproxy init_nsproxy;
31
32struct nsproxy *dup_namespaces(struct nsproxy *orig);
33int copy_namespaces(int flags, struct task_struct *tsk);
34void get_task_namespaces(struct task_struct *tsk);
35void free_nsproxy(struct nsproxy *ns);
36
37static inline void put_nsproxy(struct nsproxy *ns)
38{
39 if (atomic_dec_and_test(&ns->count)) {
40 free_nsproxy(ns);
41 }
42}
43
44static inline void exit_task_namespaces(struct task_struct *p)
45{
46 struct nsproxy *ns = p->nsproxy;
47 if (ns) {
48 task_lock(p);
49 p->nsproxy = NULL;
50 task_unlock(p);
51 put_nsproxy(ns);
52 }
53}
54#endif