Hi Shiyang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on xfs-linux/for-next]
[also build test ERROR on dm/for-next linus/master v5.13-rc4]
[cannot apply to hnaz-linux-mm/master next-20210603]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Shiyang-Ruan/fsdax-introduce-fs-query-to-support-reflink/20210604-092105
base:   https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git for-next
config: parisc-randconfig-r016-20210604 (attached as .config)
compiler: hppa-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/8fc6cb02d396487fa3a77fb57f23dcdc978dd3e3
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Shiyang-Ruan/fsdax-introduce-fs-query-to-support-reflink/20210604-092105
        git checkout 8fc6cb02d396487fa3a77fb57f23dcdc978dd3e3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   hppa-linux-ld: fs/xfs/xfs_super.o: in function `xfs_open_devices':
>> (.text+0x1e94): undefined reference to `fs_dax_holder_ops'
>> hppa-linux-ld: (.text+0x1e98): undefined reference to `fs_dax_holder_ops'
   hppa-linux-ld: (.text+0x1ff0): undefined reference to `fs_dax_holder_ops'
   hppa-linux-ld: fs/xfs/xfs_super.o: in function `.LC45':
>> (.rodata.cst4+0x70): undefined reference to `mf_dax_kill_procs'

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org