[PATCH 24/27] f2fs: Convert truncate_partial_data_page() to use a folio

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

Retrieve a folio from the page cache and use it throughout.
Saves five hidden calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 fs/f2fs/file.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f2f298c75921..db2778758dda 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -707,31 +707,33 @@ static int truncate_partial_data_page(struct inode *inode, u64 from,
 	loff_t offset = from & (PAGE_SIZE - 1);
 	pgoff_t index = from >> PAGE_SHIFT;
 	struct address_space *mapping = inode->i_mapping;
-	struct page *page;
+	struct folio *folio;
 
 	if (!offset && !cache_only)
 		return 0;
 
 	if (cache_only) {
-		page = find_lock_page(mapping, index);
-		if (page && PageUptodate(page))
+		folio = filemap_lock_folio(mapping, index);
+		if (IS_ERR(folio))
+		       return 0;
+		if (folio_test_uptodate(folio))
 			goto truncate_out;
-		f2fs_put_page(page, 1);
+		f2fs_folio_put(folio, true);
 		return 0;
 	}
 
-	page = f2fs_get_lock_data_page(inode, index, true);
-	if (IS_ERR(page))
-		return PTR_ERR(page) == -ENOENT ? 0 : PTR_ERR(page);
+	folio = f2fs_get_lock_data_folio(inode, index, true);
+	if (IS_ERR(folio))
+		return PTR_ERR(folio) == -ENOENT ? 0 : PTR_ERR(folio);
 truncate_out:
-	f2fs_wait_on_page_writeback(page, DATA, true, true);
-	zero_user(page, offset, PAGE_SIZE - offset);
+	f2fs_folio_wait_writeback(folio, DATA, true, true);
+	folio_zero_segment(folio, offset, folio_size(folio));
 
 	/* An encrypted inode should have a key and truncate the last page. */
 	f2fs_bug_on(F2FS_I_SB(inode), cache_only && IS_ENCRYPTED(inode));
 	if (!cache_only)
-		set_page_dirty(page);
-	f2fs_put_page(page, 1);
+		folio_mark_dirty(folio);
+	f2fs_folio_put(folio, true);
 	return 0;
 }
 
-- 
2.47.2