include/linux/pid_namespace.h
author Florian Westphal <fw@strlen.de>
Sun, 11 Jan 2009 20:20:11 +0100
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifndef _LINUX_PID_NS_H
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#define _LINUX_PID_NS_H
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/threads.h>
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#include <linux/nsproxy.h>
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#include <linux/kref.h>
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struct pidmap {
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       atomic_t nr_free;
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       void *page;
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};
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#define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
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struct bsd_acct_struct;
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struct pid_namespace {
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	struct kref kref;
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	struct pidmap pidmap[PIDMAP_ENTRIES];
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	int last_pid;
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	struct task_struct *child_reaper;
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	struct kmem_cache *pid_cachep;
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	unsigned int level;
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	struct pid_namespace *parent;
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#ifdef CONFIG_PROC_FS
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	struct vfsmount *proc_mnt;
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#endif
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#ifdef CONFIG_BSD_PROCESS_ACCT
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	struct bsd_acct_struct *bacct;
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#endif
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};
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extern struct pid_namespace init_pid_ns;
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#ifdef CONFIG_PID_NS
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static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
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{
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	if (ns != &init_pid_ns)
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		kref_get(&ns->kref);
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	return ns;
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}
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extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
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extern void free_pid_ns(struct kref *kref);
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extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
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static inline void put_pid_ns(struct pid_namespace *ns)
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{
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	if (ns != &init_pid_ns)
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		kref_put(&ns->kref, free_pid_ns);
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}
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#else /* !CONFIG_PID_NS */
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#include <linux/err.h>
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static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
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{
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	return ns;
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}
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static inline struct pid_namespace *
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copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
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{
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	if (flags & CLONE_NEWPID)
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		ns = ERR_PTR(-EINVAL);
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	return ns;
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}
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static inline void put_pid_ns(struct pid_namespace *ns)
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{
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}
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static inline void zap_pid_ns_processes(struct pid_namespace *ns)
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{
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	BUG();
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}
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#endif /* CONFIG_PID_NS */
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static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
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{
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	return tsk->nsproxy->pid_ns;
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}
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void pidhash_init(void);
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void pidmap_init(void);
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#endif /* _LINUX_PID_NS_H */