be clear what the root i-number is

fs.c

@@ -582,7 +582,7 @@ _namei(char *path, int parent, char *name)
   struct inode *ip, *next;
 
   if(*path == '/')
-    ip = iget(ROOTDEV, 1);
+    ip = iget(ROOTDEV, ROOTINO);
   else
     ip = idup(cp->cwd);
 

fs.h

@@ -5,6 +5,7 @@
 // Block 1 is super block.
 // Inodes start at block 2.
 
+#define ROOTINO 1  // root i-number
 #define BSIZE 512  // block size
 
 // File system super block

mkfs.c

@@ -92,7 +92,7 @@ main(int argc, char *argv[])
   wsect(1, &sb);
 
   rootino = ialloc(T_DIR);
-  assert(rootino == 1);
+  assert(rootino == ROOTINO);
 
   bzero(&de, sizeof(de));
   de.inum = xshort(rootino);