add special inode operations

.github/workflows/ci-ubuntu-latest.yml

@@ -32,6 +32,7 @@ jobs:
  sudo touch /mnt/acl_file
  sudo setfacl -m d:u:root:r /mnt/acl_dir
  sudo setfacl -m u:root:r /mnt/acl_file
+ sudo setfacl -m u:root:r /mnt/nod
  - name: Test O_DIRECT
  run: sudo dd if=/dev/zero of=/mnt/direct bs=1M count=1953 oflag=direct
  - name: Test filesize

nullfs.c

@@ -195,7 +195,11 @@ const struct inode_operations nullfs_file_inode_operations = {
  .getattr = nullfs_getattr,
  .set_acl = nullfs_set_acl,
 };
-
+const struct inode_operations nullfs_special_inode_operations = {
+ .setattr = simple_setattr,
+ .getattr = nullfs_getattr,
+ .set_acl = nullfs_set_acl,
+};
 static const struct address_space_operations nullfs_aops = {
  .readpage = simple_readpage,
  .write_begin = simple_write_begin,
@@ -334,6 +338,7 @@ struct inode *nullfs_get_inode(struct super_block *sb,
  switch (mode & S_IFMT) {
  default:
  init_special_inode(inode, mode, dev);
+ inode->i_op = &nullfs_special_inode_operations;
  break;
  case S_IFREG:
  inode->i_op = &nullfs_file_inode_operations;