[PATCH 1/6] iov_iter: Convert iter_xarray_populate_pages() to use folios

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

ITER_XARRAY is exclusively used with xarrays that contain folios,
not pages, so extract folio pointers from it, not page pointers.
Removes a hidden call to compound_head() and a use of find_subpage().

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 lib/iov_iter.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 65f550cb5081..92642f517999 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1059,22 +1059,22 @@ static ssize_t iter_xarray_populate_pages(struct page **pages, struct xarray *xa
 					  pgoff_t index, unsigned int nr_pages)
 {
 	XA_STATE(xas, xa, index);
-	struct page *page;
+	struct folio *folio;
 	unsigned int ret = 0;
 
 	rcu_read_lock();
-	for (page = xas_load(&xas); page; page = xas_next(&xas)) {
-		if (xas_retry(&xas, page))
+	for (folio = xas_load(&xas); folio; folio = xas_next(&xas)) {
+		if (xas_retry(&xas, folio))
 			continue;
 
-		/* Has the page moved or been split? */
-		if (unlikely(page != xas_reload(&xas))) {
+		/* Has the folio moved or been split? */
+		if (unlikely(folio != xas_reload(&xas))) {
 			xas_reset(&xas);
 			continue;
 		}
 
-		pages[ret] = find_subpage(page, xas.xa_index);
-		get_page(pages[ret]);
+		pages[ret] = folio_file_page(folio, xas.xa_index);
+		folio_get(folio);
 		if (++ret == nr_pages)
 			break;
 	}
-- 
2.47.2