#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 list_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 */