ceph: Remove call to PagePrivate2()

Use the folio that we already have to call folio_test_private_2()
instead.  This is the last call to PagePrivate2(), so replace its
PAGEFLAG() definition with FOLIO_FLAG().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20241002040111.1023018-6-willy@infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: Matthew Wilcox (Oracle)

fs/ceph/addr.c

@@ -1051,7 +1051,9 @@ static int ceph_writepages_start(struct address_space *mapping,
 		if (!nr_folios && !locked_pages)
 			break;
 		for (i = 0; i < nr_folios && locked_pages < max_pages; i++) {
-			page = &fbatch.folios[i]->page;
+			struct folio *folio = fbatch.folios[i];
+
+			page = &folio->page;
 			doutc(cl, "? %p idx %lu\n", page, page->index);
 			if (locked_pages == 0)
 				lock_page(page);  /* first page */
@@ -1078,8 +1080,6 @@ static int ceph_writepages_start(struct address_space *mapping,
 				continue;
 			}
 			if (page_offset(page) >= ceph_wbc.i_size) {
-				struct folio *folio = page_folio(page);
-
 				doutc(cl, "folio at %lu beyond eof %llu\n",
 				      folio->index, ceph_wbc.i_size);
 				if ((ceph_wbc.size_stable ||
@@ -1095,16 +1095,16 @@ static int ceph_writepages_start(struct address_space *mapping,
 				unlock_page(page);
 				break;
 			}
-			if (PageWriteback(page) ||
-			    PagePrivate2(page) /* [DEPRECATED] */) {
+			if (folio_test_writeback(folio) ||
+			    folio_test_private_2(folio) /* [DEPRECATED] */) {
 				if (wbc->sync_mode == WB_SYNC_NONE) {
-					doutc(cl, "%p under writeback\n", page);
-					unlock_page(page);
+					doutc(cl, "%p under writeback\n", folio);
+					folio_unlock(folio);
 					continue;
 				}
-				doutc(cl, "waiting on writeback %p\n", page);
-				wait_on_page_writeback(page);
-				folio_wait_private_2(page_folio(page)); /* [DEPRECATED] */
+				doutc(cl, "waiting on writeback %p\n", folio);
+				folio_wait_writeback(folio);
+				folio_wait_private_2(folio); /* [DEPRECATED] */
 			}
 
 			if (!clear_page_dirty_for_io(page)) {

include/linux/page-flags.h

@@ -543,7 +543,7 @@ FOLIO_FLAG(swapbacked, FOLIO_HEAD_PAGE)
  * - PG_private and PG_private_2 cause release_folio() and co to be invoked
  */
 PAGEFLAG(Private, private, PF_ANY)
-PAGEFLAG(Private2, private_2, PF_ANY) TESTSCFLAG(Private2, private_2, PF_ANY)
+FOLIO_FLAG(private_2, FOLIO_HEAD_PAGE)
 
 /* owner_2 can be set on tail pages for anon memory */
 FOLIO_FLAG(owner_2, FOLIO_HEAD_PAGE)