Ensure the ino we give to readdir matches the ino we give to stat

src/library_nodefs.js

@@ -138,7 +138,7 @@ addToLibrary({
         }
         return {
           dev: stat.dev,
-          ino: stat.ino,
+          ino: node.id,
           mode: stat.mode,
           nlink: stat.nlink,
           uid: stat.uid,

test/common.py

@@ -742,27 +742,16 @@ def make_executable(name):
 
 
 def make_dir_writeable(dirname):
-  # Ensure all files are readable and writable by the current user.
-  permission_bits = stat.S_IWRITE | stat.S_IREAD
-
-  def is_writable(path):
-    return (os.stat(path).st_mode & permission_bits) != permission_bits
-
-  def make_writable(path):
-    new_mode = os.stat(path).st_mode | permission_bits
-    os.chmod(path, new_mode)
-
   # Some tests make files and subdirectories read-only, so rmtree/unlink will not delete
   # them. Force-make everything writable in the subdirectory to make it
   # removable and re-attempt.
-  if not is_writable(dirname):
-    make_writable(dirname)
+  os.chmod(dirname, 0o777)
 
   for directory, subdirs, files in os.walk(dirname):
     for item in files + subdirs:
       i = os.path.join(directory, item)
       if not os.path.islink(i):
-        make_writable(i)
+        os.chmod(i, 0o777)
 
 
 def force_delete_dir(dirname):

test/fs/test_fs_readdir_ino_matches_stat_ino.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <dirent.h>
+
+void setup() {
+  int res = open("b", O_CREAT, 0777);
+  assert(res >= 0);
+  assert(close(res) == 0);
+  assert(symlink("b", "a") == 0);
+}
+
+int main() {
+  setup();
+  int dirfd = open(".", O_RDONLY);
+  assert(dirfd > 0);
+  DIR *dirp = fdopendir(dirfd);
+  assert(dirp != NULL);
+  struct stat sta, stb;
+  assert(lstat("a", &sta) == 0);
+  assert(lstat("b", &stb) == 0);
+  // Remove execute permission from directory. This prevents us from stat'ing
+  // files in the directory in the implementation of readdir which we tried to
+  // use to fix this.
+  assert(chmod(".", 0675) == 0);
+  int a_ino = -1;
+  int b_ino = -1;
+  struct dirent *ep;
+  while ((ep = readdir(dirp))) {
+    if (strcmp(ep->d_name, "a") == 0) {
+      a_ino = ep->d_ino;
+    }
+    if (strcmp(ep->d_name, "b") == 0) {
+      b_ino = ep->d_ino;
+    }
+  }
+  assert(errno == 0);
+  assert(a_ino >= 0);
+  assert(b_ino >= 0);
+  printf("readdir a_ino: %d, b_ino: %d\n", a_ino, b_ino);
+  printf("stat    a_ino: %llu, b_ino: %llu\n", sta.st_ino, stb.st_ino);
+  assert(a_ino == sta.st_ino);
+  assert(b_ino == stb.st_ino);
+  printf("success\n");
+  return 0;
+}

test/test_core.py

@@ -5858,6 +5858,10 @@ def test_fs_rename_on_existing(self):
       self.set_setting('FORCE_FILESYSTEM')
     self.do_runf('fs/test_fs_rename_on_existing.c', 'success')
 
+  @also_with_nodefs_both
+  def test_fs_readdir_ino_matches_stat_ino(self, args):
+    self.do_runf('fs/test_fs_readdir_ino_matches_stat_ino.c', 'success')
+
   def test_sigalrm(self):
     self.do_runf('test_sigalrm.c', 'Received alarm!')
     self.do_runf('test_sigalrm.c', 'Received alarm!', emcc_args=['-sEXIT_RUNTIME'])