1 files changed, 8 insertions, 8 deletions
diff --git a/kernel/file.h b/kernel/file.h
index f28018f..5cf15a2 100644
--- a/kernel/file.h
+++ b/kernel/file.h
@@ -1,11 +1,12 @@
 struct file {
-  enum { FD_NONE, FD_PIPE, FD_INODE } type;
+  enum { FD_NONE, FD_PIPE, FD_INODE, FD_DEVICE } type;
   int ref; // reference count
   char readable;
   char writable;
-  struct pipe *pipe;
-  struct inode *ip;
-  uint off;
+  struct pipe *pipe; // FD_PIPE
+  struct inode *ip;  // FD_INODE and FD_DEVICE
+  uint off;          // FD_INODE
+  short major;       // FD_DEVICE
 };
 
 
@@ -25,11 +26,10 @@ struct inode {
   uint addrs[NDIRECT+1];
 };
 
-// table mapping major device number to
-// device functions
+// map major device number to device functions.
 struct devsw {
-  int (*read)(struct inode*, int, uint64, int);
-  int (*write)(struct inode*, int, uint64, int);
+  int (*read)(int, uint64, int);
+  int (*write)(int, uint64, int);
 };
 
 extern struct devsw devsw[];