[PATCH 07/12] buffer: Use b_folio in mark_buffer_dirty()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Removes about four calls to compound_head().  Two of them are inline
which removes 132 bytes from the kernel text.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/buffer.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index c44ca40530c3..7e42d67bcaad 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1095,16 +1095,16 @@ void mark_buffer_dirty(struct buffer_head *bh)
 	}
 
 	if (!test_set_buffer_dirty(bh)) {
-		struct page *page = bh->b_page;
+		struct folio *folio = bh->b_folio;
 		struct address_space *mapping = NULL;
 
-		lock_page_memcg(page);
-		if (!TestSetPageDirty(page)) {
-			mapping = page_mapping(page);
+		folio_memcg_lock(folio);
+		if (!folio_test_set_dirty(folio)) {
+			mapping = folio->mapping;
 			if (mapping)
-				__set_page_dirty(page, mapping, 0);
+				__folio_mark_dirty(folio, mapping, 0);
 		}
-		unlock_page_memcg(page);
+		folio_memcg_unlock(folio);
 		if (mapping)
 			__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
 	}
-- 
2.35.1