nilfs2: convert to nilfs_clear_folio_dirty()

All callers of nilfs_clear_dirty_page() now have a folio, so rename the
function and pass in the folio.  Saves three hidden calls to
compound_head().

Link: https://lkml.kernel.org/r/20231114084436.2755-9-konishi.ryusuke@gmail.comSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

fs/nilfs2/inode.c

@@ -186,7 +186,7 @@ static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
 		 * have dirty pages that try to be flushed in background.
 		 * So, here we simply discard this dirty page.
 		 */
-		nilfs_clear_dirty_page(page, false);
+		nilfs_clear_folio_dirty(folio, false);
 		folio_unlock(folio);
 		return -EROFS;
 	}

fs/nilfs2/mdt.c

@@ -411,7 +411,7 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
 		 * have dirty folios that try to be flushed in background.
 		 * So, here we simply discard this dirty folio.
 		 */
-		nilfs_clear_dirty_page(page, false);
+		nilfs_clear_folio_dirty(folio, false);
 		folio_unlock(folio);
 		return -EROFS;
 	}

fs/nilfs2/page.c

@@ -379,7 +379,7 @@ void nilfs_clear_dirty_pages(struct address_space *mapping, bool silent)
 			 * was acquired.  Skip processing in that case.
 			 */
 			if (likely(folio->mapping == mapping))
-				nilfs_clear_dirty_page(&folio->page, silent);
+				nilfs_clear_folio_dirty(folio, silent);
 
 			folio_unlock(folio);
 		}
@@ -389,32 +389,33 @@ void nilfs_clear_dirty_pages(struct address_space *mapping, bool silent)
 }
 
 /**
- * nilfs_clear_dirty_page - discard dirty page
- * @page: dirty page that will be discarded
+ * nilfs_clear_folio_dirty - discard dirty folio
+ * @folio: dirty folio that will be discarded
  * @silent: suppress [true] or print [false] warning messages
  */
-void nilfs_clear_dirty_page(struct page *page, bool silent)
+void nilfs_clear_folio_dirty(struct folio *folio, bool silent)
 {
-	struct inode *inode = page->mapping->host;
+	struct inode *inode = folio->mapping->host;
 	struct super_block *sb = inode->i_sb;
+	struct buffer_head *bh, *head;
 
-	BUG_ON(!PageLocked(page));
+	BUG_ON(!folio_test_locked(folio));
 
 	if (!silent)
 		nilfs_warn(sb, "discard dirty page: offset=%lld, ino=%lu",
-			   page_offset(page), inode->i_ino);
+			   folio_pos(folio), inode->i_ino);
 
-	ClearPageUptodate(page);
-	ClearPageMappedToDisk(page);
+	folio_clear_uptodate(folio);
+	folio_clear_mappedtodisk(folio);
 
-	if (page_has_buffers(page)) {
-		struct buffer_head *bh, *head;
+	head = folio_buffers(folio);
+	if (head) {
 		const unsigned long clear_bits =
 			(BIT(BH_Uptodate) | BIT(BH_Dirty) | BIT(BH_Mapped) |
 			 BIT(BH_Async_Write) | BIT(BH_NILFS_Volatile) |
 			 BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected));
 
-		bh = head = page_buffers(page);
+		bh = head;
 		do {
 			lock_buffer(bh);
 			if (!silent)
@@ -427,7 +428,7 @@ void nilfs_clear_dirty_page(struct page *page, bool silent)
 		} while (bh = bh->b_this_page, bh != head);
 	}
 
-	__nilfs_clear_page_dirty(page);
+	__nilfs_clear_page_dirty(&folio->page);
 }
 
 unsigned int nilfs_page_count_clean_buffers(struct page *page,

fs/nilfs2/page.h

@@ -41,7 +41,7 @@ void nilfs_page_bug(struct page *);
 
 int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
 void nilfs_copy_back_pages(struct address_space *, struct address_space *);
-void nilfs_clear_dirty_page(struct page *, bool);
+void nilfs_clear_folio_dirty(struct folio *, bool);
 void nilfs_clear_dirty_pages(struct address_space *, bool);
 unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int,
 					    unsigned int);