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