1 /* 2 * procfs namespace bits 3 */ 4 #ifndef _LINUX_PROC_NS_H 5 #define _LINUX_PROC_NS_H 6 7 #include <linux/ns_common.h> 8 9 struct pid_namespace; 10 struct nsproxy; 11 struct path; 12 13 struct proc_ns_operations { 14 const char *name; 15 int type; 16 struct ns_common *(*get)(struct task_struct *task); 17 void (*put)(struct ns_common *ns); 18 int (*install)(struct nsproxy *nsproxy, struct ns_common *ns); 19 }; 20 21 extern const struct proc_ns_operations netns_operations; 22 extern const struct proc_ns_operations utsns_operations; 23 extern const struct proc_ns_operations ipcns_operations; 24 extern const struct proc_ns_operations pidns_operations; 25 extern const struct proc_ns_operations userns_operations; 26 extern const struct proc_ns_operations mntns_operations; 27 28 /* 29 * We always define these enumerators 30 */ 31 enum { 32 PROC_ROOT_INO = 1, 33 PROC_IPC_INIT_INO = 0xEFFFFFFFU, 34 PROC_UTS_INIT_INO = 0xEFFFFFFEU, 35 PROC_USER_INIT_INO = 0xEFFFFFFDU, 36 PROC_PID_INIT_INO = 0xEFFFFFFCU, 37 }; 38 39 #ifdef CONFIG_PROC_FS 40 41 extern int pid_ns_prepare_proc(struct pid_namespace *ns); 42 extern void pid_ns_release_proc(struct pid_namespace *ns); 43 extern int proc_alloc_inum(unsigned int *pino); 44 extern void proc_free_inum(unsigned int inum); 45 46 #else /* CONFIG_PROC_FS */ 47 48 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; } 49 static inline void pid_ns_release_proc(struct pid_namespace *ns) {} 50 51 static inline int proc_alloc_inum(unsigned int *inum) 52 { 53 *inum = 1; 54 return 0; 55 } 56 static inline void proc_free_inum(unsigned int inum) {} 57 58 #endif /* CONFIG_PROC_FS */ 59 60 static inline int ns_alloc_inum(struct ns_common *ns) 61 { 62 atomic_long_set(&ns->stashed, 0); 63 return proc_alloc_inum(&ns->inum); 64 } 65 66 #define ns_free_inum(ns) proc_free_inum((ns)->inum) 67 68 extern struct file *proc_ns_fget(int fd); 69 #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private) 70 extern void *ns_get_path(struct path *path, struct task_struct *task, 71 const struct proc_ns_operations *ns_ops); 72 73 extern int ns_get_name(char *buf, size_t size, struct task_struct *task, 74 const struct proc_ns_operations *ns_ops); 75 extern void nsfs_init(void); 76 77 #endif /* _LINUX_PROC_NS_H */ 78