Hi Shiyang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.13]
[cannot apply to hnaz-linux-mm/master xfs-linux/for-next dm/for-next next-20210625]
[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/20210628-080346
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 62fb9874f5da54fdb243003b386128037319b219
config: i386-randconfig-a012-20210628 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/6833b9441ae13413e20968838cd8de34b8c69ed4
        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/20210628-080346
        git checkout 6833b9441ae13413e20968838cd8de34b8c69ed4
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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 >>):

   ld: fs/xfs/xfs_super.o: in function `xfs_dax_notify_failure':
>> xfs_super.c:(.text+0xc35): undefined reference to `dax_get_holder'
   ld: fs/xfs/xfs_super.o: in function `xfs_open_devices':
>> xfs_super.c:(.text+0xd57): undefined reference to `dax_set_holder'
>> ld: xfs_super.c:(.text+0xdb8): undefined reference to `dax_set_holder'
   ld: fs/xfs/xfs_super.o: in function `xfs_close_devices':
   xfs_super.c:(.text+0xf0a): undefined reference to `dax_set_holder'
   ld: xfs_super.c:(.text+0xf3d): undefined reference to `dax_set_holder'
   ld: xfs_super.c:(.text+0xf59): undefined reference to `dax_set_holder'

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