[PATCH v2 28/29] ext4: Convert pagecache_read() to use a folio

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Use the folio API and support folios of arbitrary sizes.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/ext4/verity.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index e4da1704438e..afe847c967a4 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -42,18 +42,16 @@ static int pagecache_read(struct inode *inode, void *buf, size_t count,
 			  loff_t pos)
 {
 	while (count) {
-		size_t n = min_t(size_t, count,
-				 PAGE_SIZE - offset_in_page(pos));
-		struct page *page;
+		struct folio *folio;
+		size_t n;
 
-		page = read_mapping_page(inode->i_mapping, pos >> PAGE_SHIFT,
+		folio = read_mapping_folio(inode->i_mapping, pos >> PAGE_SHIFT,
 					 NULL);
-		if (IS_ERR(page))
-			return PTR_ERR(page);
-
-		memcpy_from_page(buf, page, offset_in_page(pos), n);
+		if (IS_ERR(folio))
+			return PTR_ERR(folio);
 
-		put_page(page);
+		n = memcpy_from_file_folio(buf, folio, pos, count);
+		folio_put(folio);
 
 		buf += n;
 		pos += n;
-- 
2.39.2