#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 UID_GID_MAP_MAX_EXTENTS 5 struct uid_gid_map { /* 64 bytes -- 1 cache line */ u32 nr_extents; struct uid_gid_extent { u32 first; u32 lower_first; u32 count; } extent[UID_GID_MAP_MAX_EXTENTS]; }; struct user_namespace { struct uid_gid_map uid_map; struct uid_gid_map gid_map; struct kref kref; struct user_namespace *parent; kuid_t owner; kgid_t group; }; 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 int create_user_ns(struct cred *new); 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); } struct seq_operations; extern struct seq_operations proc_uid_seq_operations; extern struct seq_operations proc_gid_seq_operations; extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *); #else static inline struct user_namespace *get_user_ns(struct user_namespace *ns) { return &init_user_ns; } static inline int create_user_ns(struct cred *new) { return -EINVAL; } static inline void put_user_ns(struct user_namespace *ns) { } #endif #endif /* _LINUX_USER_H */