proc: Split the namespace stuff out into linux/proc_ns.h

[linux-2.6-block.git] / include / linux / proc_ns.h

diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
new file mode 100644 (file)
index 0000000..34a1e10
--- /dev/null
+++ b/include/linux/proc_ns.h
@@ -0,0 +1,74 @@
+/*
+ * procfs namespace bits
+ */
+#ifndef _LINUX_PROC_NS_H
+#define _LINUX_PROC_NS_H
+
+struct pid_namespace;
+struct nsproxy;
+
+struct proc_ns_operations {
+       const char *name;
+       int type;
+       void *(*get)(struct task_struct *task);
+       void (*put)(void *ns);
+       int (*install)(struct nsproxy *nsproxy, void *ns);
+       unsigned int (*inum)(void *ns);
+};
+
+struct proc_ns {
+       void *ns;
+       const struct proc_ns_operations *ns_ops;
+};
+
+extern const struct proc_ns_operations netns_operations;
+extern const struct proc_ns_operations utsns_operations;
+extern const struct proc_ns_operations ipcns_operations;
+extern const struct proc_ns_operations pidns_operations;
+extern const struct proc_ns_operations userns_operations;
+extern const struct proc_ns_operations mntns_operations;
+
+/*
+ * We always define these enumerators
+ */
+enum {
+       PROC_ROOT_INO           = 1,
+       PROC_IPC_INIT_INO       = 0xEFFFFFFFU,
+       PROC_UTS_INIT_INO       = 0xEFFFFFFEU,
+       PROC_USER_INIT_INO      = 0xEFFFFFFDU,
+       PROC_PID_INIT_INO       = 0xEFFFFFFCU,
+};
+
+#ifdef CONFIG_PROC_FS
+
+extern int pid_ns_prepare_proc(struct pid_namespace *ns);
+extern void pid_ns_release_proc(struct pid_namespace *ns);
+extern struct file *proc_ns_fget(int fd);
+extern struct proc_ns *get_proc_ns(struct inode *);
+extern int proc_alloc_inum(unsigned int *pino);
+extern void proc_free_inum(unsigned int inum);
+extern bool proc_ns_inode(struct inode *inode);
+
+#else /* CONFIG_PROC_FS */
+
+static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
+static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
+
+static inline struct file *proc_ns_fget(int fd)
+{
+       return ERR_PTR(-EINVAL);
+}
+
+static inline struct proc_ns *get_proc_ns(struct inode *inode) { return NULL; }
+
+static inline int proc_alloc_inum(unsigned int *inum)
+{
+       *inum = 1;
+       return 0;
+}
+static inline void proc_free_inum(unsigned int inum) {}
+static inline bool proc_ns_inode(struct inode *inode) { return false; }
+
+#endif /* CONFIG_PROC_FS */
+
+#endif /* _LINUX_PROC_NS_H */