[PATCH v3 16/25] iomap: Convert __iomap_zero_iter to use a folio

[Matthew Wilcox (Oracle)]

The zero iterator can work in folio-sized chunks instead of page-sized
chunks.  This will save a lot of page cache lookups if the file is cached
in large folios.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/iomap/buffered-io.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index b1ded5204d1c..47cf558244f4 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -893,19 +893,23 @@ EXPORT_SYMBOL_GPL(iomap_file_unshare);
 
 static s64 __iomap_zero_iter(struct iomap_iter *iter, loff_t pos, u64 length)
 {
+	struct folio *folio;
 	struct page *page;
 	int status;
-	unsigned offset = offset_in_page(pos);
+	size_t offset;
 	unsigned bytes = min_t(u64, UINT_MAX, length);
 
 	status = iomap_write_begin(iter, pos, bytes, &page);
 	if (status)
 		return status;
-	if (bytes > PAGE_SIZE - offset)
-		bytes = PAGE_SIZE - offset;
+	folio = page_folio(page);
+
+	offset = offset_in_folio(folio, pos);
+	if (bytes > folio_size(folio) - offset)
+		bytes = folio_size(folio) - offset;
 
-	zero_user(page, offset, bytes);
-	mark_page_accessed(page);
+	folio_zero_range(folio, offset, bytes);
+	folio_mark_accessed(folio);
 
 	return iomap_write_end(iter, pos, bytes, bytes, page);
 }
-- 
2.33.0