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fsvar.h

 // in-core file system types
 
 struct inode {
-  uint dev;
-  uint inum;
-  int count;
-  int busy;
-  short type;
+  uint dev;           // Device number
+  uint inum;          // Inode number
+  int ref;            // Reference count
+  int busy;           // Is the inode "locked"?
+
+  short type;         // copy of disk inode
   short major;
   short minor;
   short nlink;