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TOMOYO Linux Cross Reference
Linux/include/linux/proc_ns.h

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  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 

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