pid_namespace.h 2.2 KB
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#ifndef _LINUX_PID_NS_H
#define _LINUX_PID_NS_H
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#include <linux/sched.h>
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#include <linux/bug.h>
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#include <linux/mm.h>
#include <linux/threads.h>
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#include <linux/nsproxy.h>
#include <linux/kref.h>
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struct pidmap {
       atomic_t nr_free;
       void *page;
};

#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;
	struct pidmap pidmap[PIDMAP_ENTRIES];
	int last_pid;
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	unsigned int nr_hashed;
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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
	struct vfsmount *proc_mnt;
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	struct dentry *proc_self;
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#endif
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#ifdef CONFIG_BSD_PROCESS_ACCT
	struct bsd_acct_struct *bacct;
#endif
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	struct user_namespace *user_ns;
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	struct work_struct proc_work;
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	kgid_t pid_gid;
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	int hide_pid;
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	int reboot;	/* group exit code if this pidns was rebooted */
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	unsigned int proc_inum;
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};

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extern struct pid_namespace init_pid_ns;
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#define PIDNS_HASH_ADDING (1U << 31)

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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)
		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 user_namespace *user_ns, struct pid_namespace *ns);
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extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
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extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
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extern void put_pid_ns(struct pid_namespace *ns);
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#else /* !CONFIG_PID_NS */
#include <linux/err.h>

static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	return ns;
}

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static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
	struct user_namespace *user_ns, struct pid_namespace *ns)
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{
	if (flags & CLONE_NEWPID)
		ns = ERR_PTR(-EINVAL);
	return ns;
}

static inline void put_pid_ns(struct pid_namespace *ns)
{
}

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static inline void zap_pid_ns_processes(struct pid_namespace *ns)
{
	BUG();
}
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static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
{
	return 0;
}
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#endif /* CONFIG_PID_NS */

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extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
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void pidhash_init(void);
void pidmap_init(void);

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#endif /* _LINUX_PID_NS_H */