1#ifndef _LINUX_PID_NS_H 2#define _LINUX_PID_NS_H 3 4#include <linux/sched.h> 5#include <linux/bug.h> 6#include <linux/mm.h> 7#include <linux/workqueue.h> 8#include <linux/threads.h> 9#include <linux/nsproxy.h> 10#include <linux/kref.h> 11#include <linux/ns_common.h> 12 13struct pidmap { 14 atomic_t nr_free; 15 void *page; 16}; 17 18#define BITS_PER_PAGE (PAGE_SIZE * 8) 19#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1) 20#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE) 21 22struct fs_pin; 23 24struct pid_namespace { 25 struct kref kref; 26 struct pidmap pidmap[PIDMAP_ENTRIES]; 27 struct rcu_head rcu; 28 int last_pid; 29 unsigned int nr_hashed; 30 struct task_struct *child_reaper; 31 struct kmem_cache *pid_cachep; 32 unsigned int level; 33 struct pid_namespace *parent; 34#ifdef CONFIG_PROC_FS 35 struct vfsmount *proc_mnt; 36 struct dentry *proc_self; 37 struct dentry *proc_thread_self; 38#endif 39#ifdef CONFIG_BSD_PROCESS_ACCT 40 struct fs_pin *bacct; 41#endif 42 struct user_namespace *user_ns; 43 struct work_struct proc_work; 44 kgid_t pid_gid; 45 int hide_pid; 46 int reboot; /* group exit code if this pidns was rebooted */ 47 struct ns_common ns; 48}; 49 50extern struct pid_namespace init_pid_ns; 51 52#define PIDNS_HASH_ADDING (1U << 31) 53 54#ifdef CONFIG_PID_NS 55static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 56{ 57 if (ns != &init_pid_ns) 58 kref_get(&ns->kref); 59 return ns; 60} 61 62extern struct pid_namespace *copy_pid_ns(unsigned long flags, 63 struct user_namespace *user_ns, struct pid_namespace *ns); 64extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 65extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 66extern void put_pid_ns(struct pid_namespace *ns); 67 68#else /* !CONFIG_PID_NS */ 69#include <linux/err.h> 70 71static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 72{ 73 return ns; 74} 75 76static inline struct pid_namespace *copy_pid_ns(unsigned long flags, 77 struct user_namespace *user_ns, struct pid_namespace *ns) 78{ 79 if (flags & CLONE_NEWPID) 80 ns = ERR_PTR(-EINVAL); 81 return ns; 82} 83 84static inline void put_pid_ns(struct pid_namespace *ns) 85{ 86} 87 88static inline void zap_pid_ns_processes(struct pid_namespace *ns) 89{ 90 BUG(); 91} 92 93static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 94{ 95 return 0; 96} 97#endif /* CONFIG_PID_NS */ 98 99extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 100void pidhash_init(void); 101void pidmap_init(void); 102 103#endif /* _LINUX_PID_NS_H */ 104