[PATCH 04/10] mm/truncate: Replace page_mapped() call in invalidate_inode_page()

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folio_mapped() is expensive because it has to check each page's mapcount
field.  A cheaper check is whether there are any extra references to
the page, other than the one we own and the ones held by the page cache.
The call to remove_mapping() will fail in any case if it cannot freeze
the refcount, but failing here avoids cycling the i_pages spinlock.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 mm/truncate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/truncate.c b/mm/truncate.c
index b73c30c95cd0..d67fa8871b75 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -287,7 +287,7 @@ int invalidate_inode_page(struct page *page)
 		return 0;
 	if (folio_test_dirty(folio) || folio_test_writeback(folio))
 		return 0;
-	if (page_mapped(page))
+	if (folio_ref_count(folio) > folio_nr_pages(folio) + 1)
 		return 0;
 	if (folio_has_private(folio) && !filemap_release_folio(folio, 0))
 		return 0;
-- 
2.34.1





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