--- a/src/impl/fs_impl.cbc	Sun Feb 02 00:23:12 2020 +0900
+++ b/src/impl/fs_impl.cbc	Mon Feb 03 15:29:54 2020 +0900
@@ -182,7 +182,41 @@
     goto next(...);
 }
 
-static struct inode* iget (uint dev, uint inum);
+static struct inode* iget (uint dev, uint inum)
+{
+    struct inode *ip, *empty;
+
+    acquire(&icache.lock);
+
+    // Is the inode already cached?
+    empty = 0;
+
+    for (ip = &icache.inode[0]; ip < &icache.inode[NINODE]; ip++) {
+        if (ip->ref > 0 && ip->dev == dev && ip->inum == inum) {
+            ip->ref++;
+            release(&icache.lock);
+            return ip;
+        }
+
+        if (empty == 0 && ip->ref == 0) {   // Remember empty slot.
+            empty = ip;
+        }
+    }
+
+    // Recycle an inode cache entry.
+    if (empty == 0) {
+        panic("iget: no inodes");
+    }
+
+    ip = empty;
+    ip->dev = dev;
+    ip->inum = inum;
+    ip->ref = 1;
+    ip->flags = 0;
+    release(&icache.lock);
+
+    return ip;
+}
 
 static char* skipelem (char *path, char *name)
 {