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md: use folio APIs in free_page()

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Convert the page to a folio.  This removes some of the last uses of a few
page APIs (detach_page_private(), page_buffers()).  Replaces two calls to
compound_head() with one.

Remove the early return in free_buffers() to avoid memory leak and
uninitialized file bitmap pages.[1][2]

[ziy@nvidia.com: drop early return]
Link: https://lore.kernel.org/20260920-remove-pg_private-v5-14-bb68b6a21869@nvidia.com
Link: https://sashiko.dev/#/patchset/20260913-remove-pg_private-v4-0-848550f7574e%40nvidia.com?part=2 [1]
Link: https://lore.kernel.org/all/aqgfA0QFi98gXYG2@casper.infradead.org/ [2]
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 22:28:10 -04:00 committed by Andrew Morton
parent ebb7205efe
commit 5d0f54ab92
1 changed files with 3 additions and 7 deletions
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10
drivers/md/md-bitmap.c
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@ -533,19 +533,15 @@ static void write_file_page(struct bitmap *bitmap, struct page *page, int wait)
static void free_buffers(struct page *page)
{
struct buffer_head *bh;
struct folio *folio = page_folio(page);
struct buffer_head *bh = folio_detach_private(folio);
if (!PagePrivate(page))
return;
bh = page_buffers(page);
while (bh) {
struct buffer_head *next = bh->b_this_page;
free_buffer_head(bh);
bh = next;
}
detach_page_private(page);
put_page(page);
folio_put(folio);
}
/* read a page from a file.