b=5498

[fs/lustre-release.git] / lustre / llite / llite_internal.h

diff --git a/lustre/llite/llite_internal.h b/lustre/llite/llite_internal.h
index b3157fc..4905090 100644 (file)
--- a/lustre/llite/llite_internal.h
+++ b/lustre/llite/llite_internal.h
@@ -783,4 +783,51 @@ void ll_truncate_free_capa(struct obd_capa *ocapa);
 void ll_clear_inode_capas(struct inode *inode);
 void ll_print_capa_stat(struct ll_sb_info *sbi);
 
 void ll_clear_inode_capas(struct inode *inode);
 void ll_print_capa_stat(struct ll_sb_info *sbi);
 

+/* llite ioctl register support rountine */
+#ifdef __KERNEL__
+enum llioc_iter {
+        LLIOC_CONT = 0,
+        LLIOC_STOP
+};
+
+#define LLIOC_MAX_CMD           256
+
+/*
+ * Rules to write a callback function:
+ *
+ * Parameters:
+ *  @magic: Dynamic ioctl call routine will feed this vaule with the pointer
+ *      returned to ll_iocontrol_register.  Callback functions should use this
+ *      data to check the potential collasion of ioctl cmd. If collasion is 
+ *      found, callback function should return LLIOC_CONT.
+ *  @rcp: The result of ioctl command.
+ *
+ *  Return values:
+ *      If @magic matches the pointer returned by ll_iocontrol_data, the 
+ *      callback should return LLIOC_STOP; return LLIOC_STOP otherwise.
+ */
+typedef enum llioc_iter (*llioc_callback_t)(struct inode *inode, 
+                struct file *file, unsigned int cmd, unsigned long arg,
+                void *magic, int *rcp);
+
+enum llioc_iter ll_iocontrol_call(struct inode *inode, struct file *file, 
+                unsigned int cmd, unsigned long arg, int *rcp);
+
+/* export functions */
+/* Register ioctl block dynamatically for a regular file. 
+ *
+ * @cmd: the array of ioctl command set
+ * @count: number of commands in the @cmd
+ * @cb: callback function, it will be called if an ioctl command is found to 
+ *      belong to the command list @cmd.
+ *
+ * Return vaule:
+ *      A magic pointer will be returned if success; 
+ *      otherwise, NULL will be returned. 
+ * */
+void *ll_iocontrol_register(llioc_callback_t cb, int count, unsigned int *cmd);
+void ll_iocontrol_unregister(void *magic);
+
+#endif
+

 #endif /* LLITE_INTERNAL_H */
 #endif /* LLITE_INTERNAL_H */