fixed listing the root of a directory not mounted at /

fixed a file named "" appearing at the end of readdir

todo: listing the root dir when mounted at / still fails

lib/fs/ext2/dir.c

@@ -204,10 +204,14 @@ status_t ext2_opendir(fscookie *cookie, const char *name, dircookie **dcookie) {
     int err;
     inodenum_t inum;
     //uint file_blocknum;
-    err = ext2_lookup(ext2, name, &inum);
-    if (err < 0) {
-      LTRACEF("err = %d\n", err);
-      return err;
+    if (name[0] == 0) {
+      inum = EXT2_ROOT_INO;
+    } else {
+      err = ext2_lookup(ext2, name, &inum);
+      if (err < 0) {
+        LTRACEF("err = %d\n", err);
+        return err;
+      }
     }
     LTRACEF("inum = %d\n", inum);
 
@@ -302,6 +306,12 @@ status_t ext2_readdir(dircookie *cookie, struct dirent *ent_out) {
     }
 
     pos += ROUNDUP(LE16(ent->rec_len), 4);
+    if (ent->inode == 0) { // deleted file
+      // TODO, assumes end of dir listing
+      // it should continue to the next record, potentially in the next block
+      free(buf);
+      return ERR_NOT_FOUND;
+    }
     if (pos >= EXT2_BLOCK_SIZE(cookie->fs->sb)) {
       cookie->fileblock++;
       cookie->cursor = 0;