be clear what the root i-number is

2ce40d70 · rtm · be38c841 · 2ce40d70 · 2ce40d70 · 2ce40d70
--- a/fs.c
+++ b/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);

--- a/fs.h
+++ b/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

--- a/mkfs.c
+++ b/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);