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