btrfs: make __extent_writepage_io take btrfs_inode

 * 0 if all went well (page still locked)

 * < 0 if there were errors (page still locked)

 */

static noinline_for_stack int __extent_writepage_io(struct inode *inode,

static noinline_for_stack int __extent_writepage_io(struct btrfs_inode *inode,

				 struct page *page,

				 struct writeback_control *wbc,

				 struct extent_page_data *epd,

				 unsigned long nr_written,

				 int *nr_ret)

{

	struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;

	struct extent_io_tree *tree = &inode->io_tree;

	u64 start = page_offset(page);

	u64 page_end = start + PAGE_SIZE - 1;

	u64 end;

	update_nr_written(wbc, nr_written + 1);

	end = page_end;

	blocksize = inode->i_sb->s_blocksize;

	blocksize = inode->vfs_inode.i_sb->s_blocksize;

	while (cur <= end) {

		u64 em_end;

							     page_end, 1);

			break;

		}

		em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur,

				      end - cur + 1);

		em = btrfs_get_extent(inode, NULL, 0, cur, end - cur + 1);

		if (IS_ERR_OR_NULL(em)) {

			SetPageError(page);

			ret = PTR_ERR_OR_ZERO(em);

		btrfs_set_range_writeback(tree, cur, cur + iosize - 1);

		if (!PageWriteback(page)) {

			btrfs_err(BTRFS_I(inode)->root->fs_info,

			btrfs_err(inode->root->fs_info,

				   "page %lu not writeback, cur %llu end %llu",

			       page->index, cur, end);

		}

			goto done;

	}

	ret = __extent_writepage_io(inode, page, wbc, epd,

				    i_size, nr_written, &nr);

	ret = __extent_writepage_io(BTRFS_I(inode), page, wbc, epd, i_size,

				    nr_written, &nr);

	if (ret == 1)

		return 0;