jbd2: Convert jbd2_journal_try_to_free_buffers to take a folio

Also convert it to return a bool since it's called from release_folio().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jeff Layton <jlayton@kernel.org>

Author: Matthew Wilcox (Oracle)

fs/ext4/inode.c

@@ -3253,7 +3253,7 @@ static bool ext4_release_folio(struct folio *folio, gfp_t wait)
 	if (folio_test_checked(folio))
 		return false;
 	if (journal)
-		return jbd2_journal_try_to_free_buffers(journal, &folio->page);
+		return jbd2_journal_try_to_free_buffers(journal, folio);
 	else
 		return try_to_free_buffers(&folio->page);
 }

fs/jbd2/transaction.c

@@ -2143,17 +2143,17 @@ __journal_try_to_free_buffer(journal_t *journal, struct buffer_head *bh)
  * cannot happen because we never reallocate freed data as metadata
  * while the data is part of a transaction.  Yes?
  *
- * Return 0 on failure, 1 on success
+ * Return false on failure, true on success
  */
-int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page)
+bool jbd2_journal_try_to_free_buffers(journal_t *journal, struct folio *folio)
 {
 	struct buffer_head *head;
 	struct buffer_head *bh;
-	int ret = 0;
+	bool ret = false;
 
-	J_ASSERT(PageLocked(page));
+	J_ASSERT(folio_test_locked(folio));
 
-	head = page_buffers(page);
+	head = folio_buffers(folio);
 	bh = head;
 	do {
 		struct journal_head *jh;
@@ -2175,7 +2175,7 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page)
 			goto busy;
 	} while ((bh = bh->b_this_page) != head);
 
-	ret = try_to_free_buffers(page);
+	ret = try_to_free_buffers(&folio->page);
 busy:
 	return ret;
 }

include/linux/jbd2.h

@@ -1529,7 +1529,7 @@ extern int	 jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
 extern int	 jbd2_journal_forget (handle_t *, struct buffer_head *);
 int jbd2_journal_invalidate_folio(journal_t *, struct folio *,
 					size_t offset, size_t length);
-extern int	 jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page);
+bool jbd2_journal_try_to_free_buffers(journal_t *journal, struct folio *folio);
 extern int	 jbd2_journal_stop(handle_t *);
 extern int	 jbd2_journal_flush(journal_t *journal, unsigned int flags);
 extern void	 jbd2_journal_lock_updates (journal_t *);