[PATCH 01/19] buffer_head: Remove b_page

From: "Matthew Wilcox (Oracle)" <[email protected]>

All users except bh_offset() have been converted to use b_folio instead.
Convert bh_offset() and remove b_page.

Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Signed-off-by: Chao Shi <[email protected]>
---
 include/linux/buffer_head.h | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index fd2c7115c054..699970b4bbf2 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -59,10 +59,7 @@ struct address_space;
 struct buffer_head {
 	unsigned long b_state;		/* buffer state bitmap (see above) */
 	struct buffer_head *b_this_page;/* circular list of page's buffers */
-	union {
-		struct page *b_page;	/* the page this bh is mapped to */
-		struct folio *b_folio;	/* the folio this bh is mapped to */
-	};
+	struct folio *b_folio;		/* the folio this bh is mapped to */
 
 	sector_t b_blocknr;		/* start block number */
 	size_t b_size;			/* size of mapping */
@@ -172,7 +169,7 @@ static __always_inline int buffer_uptodate(const struct buffer_head *bh)
 
 static inline unsigned long bh_offset(const struct buffer_head *bh)
 {
-	return (unsigned long)(bh)->b_data & (page_size(bh->b_page) - 1);
+	return (unsigned long)(bh)->b_data & (folio_size(bh->b_folio) - 1);
 }
 
 /* If we *know* page->private refers to buffer_heads */
-- 
2.43.0