linux-kernel - [PATCH v13 130/137] mm/truncate: Fix invalidate_complete

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Date:   Mon, 12 Jul 2021 04:06:54 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH v13 130/137] mm/truncate: Fix invalidate_complete_page2 for THPs

invalidate_complete_page2() currently open-codes filemap_free_folio(),
except for the part where it handles THP.  Rather than adding that,
call page_cache_free_page() from invalidate_complete_page2().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 mm/filemap.c  | 3 +--
 mm/internal.h | 1 +
 mm/truncate.c | 5 +----
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index ab3503493975..c8fc0d07fa92 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -228,8 +228,7 @@ void __filemap_remove_folio(struct folio *folio, void *shadow)
 	page_cache_delete(mapping, folio, shadow);
 }
 
-static void filemap_free_folio(struct address_space *mapping,
-				struct folio *folio)
+void filemap_free_folio(struct address_space *mapping, struct folio *folio)
 {
 	void (*freepage)(struct page *);
 
diff --git a/mm/internal.h b/mm/internal.h
index 65314d4380d0..d3958ef40d8b 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -73,6 +73,7 @@ unsigned find_lock_entries(struct address_space *mapping, pgoff_t start,
 unsigned find_get_entries(struct address_space *mapping, pgoff_t start,
 		pgoff_t end, struct pagevec *pvec, pgoff_t *indices);
 bool truncate_inode_partial_page(struct page *page, loff_t start, loff_t end);
+void filemap_free_folio(struct address_space *mapping, struct folio *folio);
 
 /**
  * folio_evictable - Test whether a folio is evictable.
diff --git a/mm/truncate.c b/mm/truncate.c
index cc849e2b080b..b2c4d2bcf970 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -619,10 +619,7 @@ static int invalidate_complete_folio2(struct address_space *mapping,
 	__filemap_remove_folio(folio, NULL);
 	xa_unlock_irqrestore(&mapping->i_pages, flags);
 
-	if (mapping->a_ops->freepage)
-		mapping->a_ops->freepage(&folio->page);
-
-	folio_ref_sub(folio, folio_nr_pages(folio));	/* pagecache ref */
+	filemap_free_folio(mapping, folio);
 	return 1;
 failed:
 	xa_unlock_irqrestore(&mapping->i_pages, flags);
-- 
2.30.2