1 #ifndef _LINUX_NSPROXY_H
2 #define _LINUX_NSPROXY_H
4 #include <linux/spinlock.h>
5 #include <linux/sched.h>
11 struct cgroup_namespace
;
15 * A structure to contain pointers to all per-process
16 * namespaces - fs (mount), uts, network, sysvipc, etc.
18 * The pid namespace is an exception -- it's accessed using
19 * task_active_pid_ns. The pid namespace here is the
20 * namespace that children will use.
22 * 'count' is the number of tasks holding a reference.
23 * The count for each namespace, then, will be the number
24 * of nsproxies pointing to it, not the number of tasks.
26 * The nsproxy is shared by tasks which share all namespaces.
27 * As soon as a single namespace is cloned or unshared, the
32 struct uts_namespace
*uts_ns
;
33 struct ipc_namespace
*ipc_ns
;
34 struct mnt_namespace
*mnt_ns
;
35 struct pid_namespace
*pid_ns_for_children
;
37 struct cgroup_namespace
*cgroup_ns
;
39 extern struct nsproxy init_nsproxy
;
42 * the namespaces access rules are:
44 * 1. only current task is allowed to change tsk->nsproxy pointer or
45 * any pointer on the nsproxy itself. Current must hold the task_lock
46 * when changing tsk->nsproxy.
48 * 2. when accessing (i.e. reading) current task's namespaces - no
49 * precautions should be taken - just dereference the pointers
51 * 3. the access to other task namespaces is performed like this
53 * nsproxy = task->nsproxy;
54 * if (nsproxy != NULL) {
56 * * work with the namespaces here
57 * * e.g. get the reference on one of them
60 * * NULL task->nsproxy means that this task is
61 * * almost dead (zombie)
67 int copy_namespaces(unsigned long flags
, struct task_struct
*tsk
);
68 void exit_task_namespaces(struct task_struct
*tsk
);
69 void switch_task_namespaces(struct task_struct
*tsk
, struct nsproxy
*new);
70 void free_nsproxy(struct nsproxy
*ns
);
71 int unshare_nsproxy_namespaces(unsigned long, struct nsproxy
**,
72 struct cred
*, struct fs_struct
*);
73 int __init
nsproxy_cache_init(void);
75 static inline void put_nsproxy(struct nsproxy
*ns
)
77 if (atomic_dec_and_test(&ns
->count
)) {
82 static inline void get_nsproxy(struct nsproxy
*ns
)
84 atomic_inc(&ns
->count
);
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