xfs: clean up mapping size calculation in __xfs_get_blocks

		}

	}

	/*

	 * If this is O_DIRECT or the mpage code calling tell them how large

	 * the mapping is, so that we can avoid repeated get_blocks calls.

	 */

	if (direct || size > (1 << inode->i_blkbits)) {

		struct xfs_mount	*mp = XFS_I(inode)->i_mount;

		xfs_off_t		iomap_offset = XFS_FSB_TO_B(mp, imap.br_startoff);

		xfs_off_t		iomap_delta = offset - iomap_offset;

		xfs_off_t		iomap_bsize = XFS_FSB_TO_B(mp, imap.br_blockcount);

		ASSERT(iomap_bsize - iomap_delta > 0);

		offset = min_t(xfs_off_t,

				iomap_bsize - iomap_delta, size);

		bh_result->b_size = (ssize_t)min_t(xfs_off_t, LONG_MAX, offset);

		xfs_off_t		mapping_size;

		mapping_size = imap.br_startoff + imap.br_blockcount - iblock;

		mapping_size <<= inode->i_blkbits;

		ASSERT(mapping_size > 0);

		if (mapping_size > size)

			mapping_size = size;

		if (mapping_size > LONG_MAX)

			mapping_size = LONG_MAX;

		bh_result->b_size = mapping_size;

	}

	return 0;