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Commit | Line | Data |
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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); | |
38 | ||
444f378b | 39 | static inline void put_nsproxy(struct nsproxy *ns) |
ab516013 | 40 | { |
444f378b | 41 | if (atomic_dec_and_test(&ns->count)) { |
ab516013 | 42 | free_nsproxy(ns); |
444f378b | 43 | } |
ab516013 SH |
44 | } |
45 | ||
444f378b | 46 | static inline void exit_task_namespaces(struct task_struct *p) |
ab516013 | 47 | { |
444f378b LT |
48 | struct nsproxy *ns = p->nsproxy; |
49 | if (ns) { | |
50 | task_lock(p); | |
51 | p->nsproxy = NULL; | |
52 | task_unlock(p); | |
53 | put_nsproxy(ns); | |
54 | } | |
ab516013 SH |
55 | } |
56 | #endif |