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#ifndef _LINUX_USER_NAMESPACE_H

#define _LINUX_USER_NAMESPACE_H

#include <linux/kref.h>

#include <linux/nsproxy.h>

#include <linux/sched.h>

#include <linux/err.h>

#define UIDHASH_BITS    (CONFIG_BASE_SMALL ? 3 : 8)

#define UIDHASH_SZ      (1 << UIDHASH_BITS)

struct user_namespace {

        struct kref             kref;

        struct hlist_head       uidhash_table[UIDHASH_SZ];

        struct user_struct      *root_user;

};

extern struct user_namespace init_user_ns;

#ifdef CONFIG_USER_NS

static inline struct user_namespace *get_user_ns(struct user_namespace *ns)

{

        if (ns)

                kref_get(&ns->kref);

        return ns;

}

extern struct user_namespace *copy_user_ns(int flags,

                                           struct user_namespace *old_ns);

extern void free_user_ns(struct kref *kref);

static inline void put_user_ns(struct user_namespace *ns)

{

        if (ns)

                kref_put(&ns->kref, free_user_ns);

}

#else

static inline struct user_namespace *get_user_ns(struct user_namespace *ns)

{

        return &init_user_ns;

}

static inline struct user_namespace *copy_user_ns(int flags,

                                                  struct user_namespace *old_ns)

{

        if (flags & CLONE_NEWUSER)

                return ERR_PTR(-EINVAL);

        return old_ns;

}

static inline void put_user_ns(struct user_namespace *ns)

{

}

#endif

#endif /* _LINUX_USER_H */