[PATCH v8 4/9] fs, block: copy_file_range for def_blk_ops for direct block device.

[kernel test robot]

Hi Anuj,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on axboe-block/for-next]
[also build test ERROR on device-mapper-dm/for-next linus/master v6.3-rc4 next-20230329]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Anuj-Gupta/block-Add-copy-offload-support-infrastructure/20230329-162018
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
patch link:    https://lore.kernel.org/r/20230327084103.21601-5-anuj20.g%40samsung.com
patch subject: [PATCH v8 4/9] fs, block: copy_file_range for def_blk_ops for direct block device.
config: x86_64-randconfig-a013 (https://download.01.org/0day-ci/archive/20230329/202303292349.ED70Fxdw-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/61819d260936954ddd6688548f074e7063dcf39e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Anuj-Gupta/block-Add-copy-offload-support-infrastructure/20230329-162018
        git checkout 61819d260936954ddd6688548f074e7063dcf39e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303292349.ED70Fxdw-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: vmlinux.o: in function `generic_copy_file_checks':
>> fs/read_write.c:1453: undefined reference to `I_BDEV'


vim +1453 fs/read_write.c

  1398	
  1399	/*
  1400	 * Performs necessary checks before doing a file copy
  1401	 *
  1402	 * Can adjust amount of bytes to copy via @req_count argument.
  1403	 * Returns appropriate error code that caller should return or
  1404	 * zero in case the copy should be allowed.
  1405	 */
  1406	static int generic_copy_file_checks(struct file *file_in, loff_t pos_in,
  1407					    struct file *file_out, loff_t pos_out,
  1408					    size_t *req_count, unsigned int flags)
  1409	{
  1410		struct inode *inode_in = file_inode(file_in);
  1411		struct inode *inode_out = file_inode(file_out);
  1412		uint64_t count = *req_count;
  1413		loff_t size_in;
  1414		int ret;
  1415	
  1416		ret = generic_file_rw_checks(file_in, file_out);
  1417		if (ret)
  1418			return ret;
  1419	
  1420		/*
  1421		 * We allow some filesystems to handle cross sb copy, but passing
  1422		 * a file of the wrong filesystem type to filesystem driver can result
  1423		 * in an attempt to dereference the wrong type of ->private_data, so
  1424		 * avoid doing that until we really have a good reason.
  1425		 *
  1426		 * nfs and cifs define several different file_system_type structures
  1427		 * and several different sets of file_operations, but they all end up
  1428		 * using the same ->copy_file_range() function pointer.
  1429		 */
  1430		if (flags & COPY_FILE_SPLICE) {
  1431			/* cross sb splice is allowed */
  1432		} else if (file_out->f_op->copy_file_range) {
  1433			if (file_in->f_op->copy_file_range !=
  1434			    file_out->f_op->copy_file_range)
  1435				return -EXDEV;
  1436		} else if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb) {
  1437			return -EXDEV;
  1438		}
  1439	
  1440		/* Don't touch certain kinds of inodes */
  1441		if (IS_IMMUTABLE(inode_out))
  1442			return -EPERM;
  1443	
  1444		if (IS_SWAPFILE(inode_in) || IS_SWAPFILE(inode_out))
  1445			return -ETXTBSY;
  1446	
  1447		/* Ensure offsets don't wrap. */
  1448		if (pos_in + count < pos_in || pos_out + count < pos_out)
  1449			return -EOVERFLOW;
  1450	
  1451		/* Shorten the copy to EOF */
  1452		if (S_ISBLK(inode_in->i_mode))
> 1453			size_in = bdev_nr_bytes(I_BDEV(file_in->f_mapping->host));
  1454		else
  1455			size_in = i_size_read(inode_in);
  1456	
  1457		if (pos_in >= size_in)
  1458			count = 0;
  1459		else
  1460			count = min(count, size_in - (uint64_t)pos_in);
  1461	
  1462		ret = generic_write_check_limits(file_out, pos_out, &count);
  1463		if (ret)
  1464			return ret;
  1465	
  1466		/* Don't allow overlapped copying within the same file. */
  1467		if (inode_in == inode_out &&
  1468		    pos_out + count > pos_in &&
  1469		    pos_out < pos_in + count)
  1470			return -EINVAL;
  1471	
  1472		*req_count = count;
  1473		return 0;
  1474	}
  1475	

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