text: /*
   * Copyright (c) 2021, Justin Mietzner <sw1tchbl4d3@sw1tchbl4d3.com>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include <Kernel/FileSystem/Custody.h>
  #include <Kernel/FileSystem/VirtualFileSystem.h>
  #include <Kernel/Process.h>
  
  namespace Kernel {
  
  ErrorOr<FlatPtr> Process::do_statvfs(FileSystem const& fs, Custody const* custody, statvfs* buf)
  {
      statvfs kernelbuf = {};
  
      kernelbuf.f_bsize = static_cast<u64>(fs.block_size());
      kernelbuf.f_frsize = fs.fragment_size();
      kernelbuf.f_blocks = fs.total_block_count();
      kernelbuf.f_bfree = fs.free_block_count();
  
      // FIXME: Implement "available blocks" into Filesystem
      kernelbuf.f_bavail = fs.free_block_count();
  
      kernelbuf.f_files = fs.total_inode_count();
      kernelbuf.f_ffree = fs.free_inode_count();
      kernelbuf.f_favail = fs.free_inode_count(); // FIXME: same as f_bavail
  
      kernelbuf.f_fsid = fs.fsid().value();
  
      kernelbuf.f_namemax = 255;
  
      if (custody)
          kernelbuf.f_flag = custody->mount_flags();
  
      TRY(copy_to_user(buf, &kernelbuf));
      return 0;
  }
  
  ErrorOr<FlatPtr> Process::sys$statvfs(Userspace<const Syscall::SC_statvfs_params*> user_params)
  {
      VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
      REQUIRE_PROMISE(rpath);
      auto params = TRY(copy_typed_from_user(user_params));
  
      auto path = TRY(get_syscall_path_argument(params.path));
  
      auto custody = TRY(VirtualFileSystem::the().resolve_path(path->view(), current_directory(), nullptr, 0));
      auto& inode = custody->inode();
      auto const& fs = inode.fs();
  
      return do_statvfs(fs, custody, params.buf);
  }
  
  ErrorOr<FlatPtr> Process::sys$fstatvfs(int fd, statvfs* buf)
  {
      VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
      REQUIRE_PROMISE(stdio);
  
      auto description = TRY(fds().open_file_description(fd));
      auto const* inode = description->inode();
      if (inode == nullptr)
          return ENOENT;
  
      // FIXME: The custody that we pass in might be outdated. However, this only affects the mount flags.
      return do_statvfs(inode->fs(), description->custody(), buf);
  }
  
  }
  