filemap: convert __filemap_fdatawait_range() to use filemap_get_folios_tag()

Convert function to use folios.  This is in preparation for the removal of
find_get_pages_range_tag().  This change removes 2 calls to
compound_head().

Link: https://lkml.kernel.org/r/20230104211448.4804-4-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Matthew Wilcow (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/filemap.c b/mm/filemap.c
index 291bb3e..85adbcf 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -503,25 +503,27 @@ static void __filemap_fdatawait_range(struct address_space *mapping,
 {
        pgoff_t index = start_byte >> PAGE_SHIFT;
        pgoff_t end = end_byte >> PAGE_SHIFT;
-       struct pagevec pvec;
-       int nr_pages;
+       struct folio_batch fbatch;
+       unsigned nr_folios;
+
+       folio_batch_init(&fbatch);
 
-       pagevec_init(&pvec);
        while (index <= end) {
                unsigned i;
 
-               nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index,
-                               end, PAGECACHE_TAG_WRITEBACK);
-               if (!nr_pages)
+               nr_folios = filemap_get_folios_tag(mapping, &index, end,
+                               PAGECACHE_TAG_WRITEBACK, &fbatch);
+
+               if (!nr_folios)
                        break;
 
-               for (i = 0; i < nr_pages; i++) {
-                       struct page *page = pvec.pages[i];
+               for (i = 0; i < nr_folios; i++) {
+                       struct folio *folio = fbatch.folios[i];
 
-                       wait_on_page_writeback(page);
-                       ClearPageError(page);
+                       folio_wait_writeback(folio);
+                       folio_clear_error(folio);
                }
-               pagevec_release(&pvec);
+               folio_batch_release(&fbatch);
                cond_resched();
        }
 }