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: h8300-randconfig-r021-20210604 (attached as .config)
compiler: h8300-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/94db8a17905296e4d5bfe93eb5199f477646622a
        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 94db8a17905296e4d5bfe93eb5199f477646622a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 

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

All error/warnings (new ones prefixed by >>):

   drivers/md/dm.c: In function 'open_table_device':
>> drivers/md/dm.c:784:12: error: implicit declaration of function 'dax_get_holder'; did you mean 'xa_get_order'? [-Werror=implicit-function-declaration]
     784 |  holders = dax_get_holder(td->dm_dev.dax_dev);
         |            ^~~~~~~~~~~~~~
         |            xa_get_order
>> drivers/md/dm.c:784:10: warning: assignment to 'struct list_head *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     784 |  holders = dax_get_holder(td->dm_dev.dax_dev);
         |          ^
>> drivers/md/dm.c:788:3: error: implicit declaration of function 'dax_set_holder'; did you mean 'xas_set_order'? [-Werror=implicit-function-declaration]
     788 |   dax_set_holder(td->dm_dev.dax_dev, holders, &dm_dax_holder_ops);
         |   ^~~~~~~~~~~~~~
         |   xas_set_order
   drivers/md/dm.c: In function 'close_table_device':
   drivers/md/dm.c:808:10: warning: assignment to 'struct list_head *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     808 |  holders = dax_get_holder(td->dm_dev.dax_dev);
         |          ^
   drivers/md/dm.c: In function 'dm_dax_corrputed_range':
>> drivers/md/dm.c:1339:30: warning: initialization of 'struct list_head *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1339 |  struct list_head *holders = dax_get_holder(dax_dev);
         |                              ^~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +784 drivers/md/dm.c

   750	
   751	static char *_dm_claim_ptr = "I belong to device-mapper";
   752	static const struct dax_holder_operations dm_dax_holder_ops;
   753	struct dm_holder {
   754		struct list_head list;
   755		struct mapped_device *md;
   756	};
   757	/*
   758	 * Open a table device so we can use it as a map destination.
   759	 */
   760	static int open_table_device(struct table_device *td, dev_t dev,
   761				     struct mapped_device *md)
   762	{
   763		struct block_device *bdev;
   764		struct list_head *holders;
   765		struct dm_holder *holder;
   766	
   767		int r;
   768	
   769		BUG_ON(td->dm_dev.bdev);
   770	
   771		bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _dm_claim_ptr);
   772		if (IS_ERR(bdev))
   773			return PTR_ERR(bdev);
   774	
   775		r = bd_link_disk_holder(bdev, dm_disk(md));
   776		if (r) {
   777			blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL);
   778			return r;
   779		}
   780	
   781		td->dm_dev.bdev = bdev;
   782		td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
   783	
 > 784		holders = dax_get_holder(td->dm_dev.dax_dev);
   785		if (!holders) {
   786			holders = kmalloc(sizeof(*holders), GFP_KERNEL);
   787			INIT_LIST_HEAD(holders);
 > 788			dax_set_holder(td->dm_dev.dax_dev, holders, &dm_dax_holder_ops);
   789		}
   790		holder = kmalloc(sizeof(*holder), GFP_KERNEL);
   791		holder->md = md;
   792		list_add_tail(&holder->list, holders);
   793	
   794		return 0;
   795	}
   796	

---
0-DAY CI Kernel Test Service, Intel Corporation
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