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