Buffer heads point to the allocation (ie the folio), not the page.
This is currently the same thing for all filesystems that use buffer
heads, so this is a safe transitional step.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
include/linux/buffer_head.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 33fa5e94aa80..8f14dca5fed7 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -61,7 +61,10 @@ typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
struct buffer_head {
unsigned long b_state; /* buffer state bitmap (see above) */
struct buffer_head *b_this_page;/* circular list of page's buffers */
- struct page *b_page; /* the page this bh is mapped to */
+ union {
+ struct page *b_page; /* the page 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 */
--
2.35.1
