ext4: Convert to release_folio

The use of folios should be pushed deeper into ext4 from here.

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

@@ -3243,19 +3243,19 @@ static void ext4_journalled_invalidate_folio(struct folio *folio,
 	WARN_ON(__ext4_journalled_invalidate_folio(folio, offset, length) < 0);
 }
 
-static int ext4_releasepage(struct page *page, gfp_t wait)
+static bool ext4_release_folio(struct folio *folio, gfp_t wait)
 {
-	journal_t *journal = EXT4_JOURNAL(page->mapping->host);
+	journal_t *journal = EXT4_JOURNAL(folio->mapping->host);
 
-	trace_ext4_releasepage(page);
+	trace_ext4_releasepage(&folio->page);
 
 	/* Page has dirty journalled data -> cannot release */
-	if (PageChecked(page))
-		return 0;
+	if (folio_test_checked(folio))
+		return false;
 	if (journal)
-		return jbd2_journal_try_to_free_buffers(journal, page);
+		return jbd2_journal_try_to_free_buffers(journal, &folio->page);
 	else
-		return try_to_free_buffers(page);
+		return try_to_free_buffers(&folio->page);
 }
 
 static bool ext4_inode_datasync_dirty(struct inode *inode)
@@ -3618,7 +3618,7 @@ static const struct address_space_operations ext4_aops = {
 	.dirty_folio		= ext4_dirty_folio,
 	.bmap			= ext4_bmap,
 	.invalidate_folio	= ext4_invalidate_folio,
-	.releasepage		= ext4_releasepage,
+	.release_folio		= ext4_release_folio,
 	.direct_IO		= noop_direct_IO,
 	.migratepage		= buffer_migrate_page,
 	.is_partially_uptodate  = block_is_partially_uptodate,
@@ -3636,7 +3636,7 @@ static const struct address_space_operations ext4_journalled_aops = {
 	.dirty_folio		= ext4_journalled_dirty_folio,
 	.bmap			= ext4_bmap,
 	.invalidate_folio	= ext4_journalled_invalidate_folio,
-	.releasepage		= ext4_releasepage,
+	.release_folio		= ext4_release_folio,
 	.direct_IO		= noop_direct_IO,
 	.is_partially_uptodate  = block_is_partially_uptodate,
 	.error_remove_page	= generic_error_remove_page,
@@ -3653,7 +3653,7 @@ static const struct address_space_operations ext4_da_aops = {
 	.dirty_folio		= ext4_dirty_folio,
 	.bmap			= ext4_bmap,
 	.invalidate_folio	= ext4_invalidate_folio,
-	.releasepage		= ext4_releasepage,
+	.release_folio		= ext4_release_folio,
 	.direct_IO		= noop_direct_IO,
 	.migratepage		= buffer_migrate_page,
 	.is_partially_uptodate  = block_is_partially_uptodate,