cifs: convert wdata_alloc_and_fillpages() to use filemap_get_folios_tag()

This is in preparation for the removal of find_get_pages_range_tag().  Now
also supports the use of large folios.

Since tofind might be larger than the max number of folios in a
folio_batch (15), we loop through filling in wdata->pages pulling more
batches until we either reach tofind pages or run out of folios.

This function may not return all pages in the last found folio before
tofind pages are reached.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Vishal Moola (Oracle) <[email protected]>
Acked-by: Paulo Alcantara (SUSE) <[email protected]>
Cc: Tom Talpey <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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