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md: remove the last use of page_buffers()

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Convert the page to a folio and use folio_buffers() instead.  This does
introduce one extra call to compound_head(), but will simplify a later
conversion of md-bitmap to use folios instead of pages.

Link: https://lore.kernel.org/20260920-remove-pg_private-v5-15-bb68b6a21869@nvidia.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2026-09-20 22:28:11 -04:00 committed by Andrew Morton
parent 5d0f54ab92
commit effd0cf5f5
2 changed files with 3 additions and 7 deletions
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3
drivers/md/md-bitmap.c
View File

@ -516,7 +516,8 @@ static void end_bitmap_write(struct bio *bio)
static void write_file_page(struct bitmap *bitmap, struct page *page, int wait)
{
struct buffer_head *bh = page_buffers(page);
struct folio *folio = page_folio(page);
struct buffer_head *bh = folio_buffers(folio);
while (bh && bh->b_blocknr) {
atomic_inc(&bitmap->pending_writes);

7
include/linux/buffer_head.h
View File

@ -175,12 +175,7 @@ static inline unsigned long bh_offset(const struct buffer_head *bh)
return (unsigned long)(bh)->b_data & (page_size(bh->b_page) - 1);
}
/* If we *know* page->private refers to buffer_heads */
#define page_buffers(page) \
({ \
BUG_ON(!PagePrivate(page)); \
((struct buffer_head *)page_private(page)); \
})
/* If we *know* folio->private refers to buffer_heads */
#define folio_buffers(folio) folio_get_private(folio)
void buffer_check_dirty_writeback(struct folio *folio,