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