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 struct task_struct; 13 struct inode; 14 15 struct proc_ns_operations { 16 const char *name; 17 int type; 18 struct ns_common *(*get)(struct task_struct *task); 19 void (*put)(struct ns_common *ns); 20 int (*install)(struct nsproxy *nsproxy, struct ns_common *ns); 21 struct user_namespace *(*owner)(struct ns_common *ns); 22 struct ns_common *(*get_parent)(struct ns_common *ns); 23 }; 24 25 extern const struct proc_ns_operations netns_operations; 26 extern const struct proc_ns_operations utsns_operations; 27 extern const struct proc_ns_operations ipcns_operations; 28 extern const struct proc_ns_operations pidns_operations; 29 extern const struct proc_ns_operations userns_operations; 30 extern const struct proc_ns_operations mntns_operations; 31 extern const struct proc_ns_operations cgroupns_operations; 32 33 /* 34 * We always define these enumerators 35 */ 36 enum { 37 PROC_ROOT_INO = 1, 38 PROC_IPC_INIT_INO = 0xEFFFFFFFU, 39 PROC_UTS_INIT_INO = 0xEFFFFFFEU, 40 PROC_USER_INIT_INO = 0xEFFFFFFDU, 41 PROC_PID_INIT_INO = 0xEFFFFFFCU, 42 PROC_CGROUP_INIT_INO = 0xEFFFFFFBU, 43 }; 44 45 #ifdef CONFIG_PROC_FS 46 47 extern int pid_ns_prepare_proc(struct pid_namespace *ns); 48 extern void pid_ns_release_proc(struct pid_namespace *ns); 49 extern int proc_alloc_inum(unsigned int *pino); 50 extern void proc_free_inum(unsigned int inum); 51 52 #else /* CONFIG_PROC_FS */ 53 54 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; } 55 static inline void pid_ns_release_proc(struct pid_namespace *ns) {} 56 57 static inline int proc_alloc_inum(unsigned int *inum) 58 { 59 *inum = 1; 60 return 0; 61 } 62 static inline void proc_free_inum(unsigned int inum) {} 63 64 #endif /* CONFIG_PROC_FS */ 65 66 static inline int ns_alloc_inum(struct ns_common *ns) 67 { 68 atomic_long_set(&ns->stashed, 0); 69 return proc_alloc_inum(&ns->inum); 70 } 71 72 #define ns_free_inum(ns) proc_free_inum((ns)->inum) 73 74 extern struct file *proc_ns_fget(int fd); 75 #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private) 76 extern void *ns_get_path(struct path *path, struct task_struct *task, 77 const struct proc_ns_operations *ns_ops); 78 79 extern int ns_get_name(char *buf, size_t size, struct task_struct *task, 80 const struct proc_ns_operations *ns_ops); 81 extern void nsfs_init(void); 82 83 #endif /* _LINUX_PROC_NS_H */ 84