[Crash-utility] Re: [PATCH v6 3/4] xarray: add large folio support

Hi Huang, Please check the following code change upon your v6, please note I haven't have the code tested, just to illustrate my thoughts: 1) XARRAY_TYPE_PAGE_CACHE can be put into do_xarray() flags argument, so we don't need to introduce an extra "type" argument for do_xarray(), and the function signature can stay unchanged.

2) do_xarray_iter() shouldn't contain folio information, it is supposed to concern nothing but the xarray itself. The ops->update_off() is a callback for every xarray nodes, used as the off variable updator, within which, you can deal with your folio case. Like I said previously, we'd better decouple xarray iteration with folio, any special cases are better to be handled within a callback, rather than hard code the special cases into xarray iteration directly.