1 /* 2 * procfs namespace bits 3 */ 4 #ifndef _LINUX_PROC_NS_H 5 #define _LINUX_PROC_NS_H 6 7 struct pid_namespace; 8 struct nsproxy; 9 struct ns_common; 10 11 struct proc_ns_operations { 12 const char *name; 13 int type; 14 struct ns_common *(*get)(struct task_struct *task); 15 void (*put)(struct ns_common *ns); 16 int (*install)(struct nsproxy *nsproxy, struct ns_common *ns); 17 }; 18 19 extern const struct proc_ns_operations netns_operations; 20 extern const struct proc_ns_operations utsns_operations; 21 extern const struct proc_ns_operations ipcns_operations; 22 extern const struct proc_ns_operations pidns_operations; 23 extern const struct proc_ns_operations userns_operations; 24 extern const struct proc_ns_operations mntns_operations; 25 26 /* 27 * We always define these enumerators 28 */ 29 enum { 30 PROC_ROOT_INO = 1, 31 PROC_IPC_INIT_INO = 0xEFFFFFFFU, 32 PROC_UTS_INIT_INO = 0xEFFFFFFEU, 33 PROC_USER_INIT_INO = 0xEFFFFFFDU, 34 PROC_PID_INIT_INO = 0xEFFFFFFCU, 35 }; 36 37 #ifdef CONFIG_PROC_FS 38 39 extern int pid_ns_prepare_proc(struct pid_namespace *ns); 40 extern void pid_ns_release_proc(struct pid_namespace *ns); 41 extern struct file *proc_ns_fget(int fd); 42 extern struct ns_common *get_proc_ns(struct inode *); 43 extern int proc_alloc_inum(unsigned int *pino); 44 extern void proc_free_inum(unsigned int inum); 45 extern bool proc_ns_inode(struct inode *inode); 46 47 #else /* CONFIG_PROC_FS */ 48 49 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; } 50 static inline void pid_ns_release_proc(struct pid_namespace *ns) {} 51 52 static inline struct file *proc_ns_fget(int fd) 53 { 54 return ERR_PTR(-EINVAL); 55 } 56 57 static inline struct ns_common *get_proc_ns(struct inode *inode) { return NULL; } 58 59 static inline int proc_alloc_inum(unsigned int *inum) 60 { 61 *inum = 1; 62 return 0; 63 } 64 static inline void proc_free_inum(unsigned int inum) {} 65 static inline bool proc_ns_inode(struct inode *inode) { return false; } 66 67 #endif /* CONFIG_PROC_FS */ 68 69 #define ns_alloc_inum(ns) proc_alloc_inum(&(ns)->inum) 70 #define ns_free_inum(ns) proc_free_inum((ns)->inum) 71 72 #endif /* _LINUX_PROC_NS_H */ 73