jfs: Convert force_metapage to use a folio

Convert the mp->page to a folio and operate on it.  That lets us
convert metapage_write_one() to take a folio.  Replaces five calls to
compound_head() with one.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

fs/jfs/jfs_metapage.c

@@ -689,9 +689,8 @@ void grab_metapage(struct metapage * mp)
 	unlock_page(mp->page);
 }
 
-static int metapage_write_one(struct page *page)
+static int metapage_write_one(struct folio *folio)
 {
-	struct folio *folio = page_folio(page);
 	struct address_space *mapping = folio->mapping;
 	struct writeback_control wbc = {
 		.sync_mode = WB_SYNC_ALL,
@@ -720,17 +719,17 @@ static int metapage_write_one(struct page *page)
 
 void force_metapage(struct metapage *mp)
 {
-	struct page *page = mp->page;
+	struct folio *folio = page_folio(mp->page);
 	jfs_info("force_metapage: mp = 0x%p", mp);
 	set_bit(META_forcewrite, &mp->flag);
 	clear_bit(META_sync, &mp->flag);
-	get_page(page);
-	lock_page(page);
-	set_page_dirty(page);
-	if (metapage_write_one(page))
+	folio_get(folio);
+	folio_lock(folio);
+	folio_mark_dirty(folio);
+	if (metapage_write_one(folio))
 		jfs_error(mp->sb, "metapage_write_one() failed\n");
 	clear_bit(META_forcewrite, &mp->flag);
-	put_page(page);
+	folio_put(folio);
 }
 
 void hold_metapage(struct metapage *mp)
@@ -771,7 +770,7 @@ void release_metapage(struct metapage * mp)
 		folio_mark_dirty(folio);
 		if (test_bit(META_sync, &mp->flag)) {
 			clear_bit(META_sync, &mp->flag);
-			if (metapage_write_one(&folio->page))
+			if (metapage_write_one(folio))
 				jfs_error(mp->sb, "metapage_write_one() failed\n");
 			folio_lock(folio);
 		}