mm/truncate: Inline invalidate_complete_page() into its one caller

invalidate_inode_page() is the only caller of invalidate_complete_page()
and inlining it reveals that the first check is unnecessary (because we
hold the page locked, and we just retrieved the mapping from the page).
Actually, it does make a difference, in that tail pages no longer fail
at this check, so it's now possible to remove a tail page from a mapping.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index 51dd822..b22ef1e 100644 (file)
--- a/kernel/futex/core.c
+++ b/kernel/futex/core.c
@@ -302,7 +302,7 @@ again:
         * found it, but truncated or holepunched or subjected to
         * invalidate_complete_page2 before we got the page lock (also
         * cases which we are happy to fail).  And we hold a reference,
-        * so refcount care in invalidate_complete_page's remove_mapping
+        * so refcount care in invalidate_inode_page's remove_mapping
         * prevents drop_caches from setting mapping to NULL beneath us.
         *
         * The case we do have to guard against is when memory pressure made

diff --git a/mm/truncate.c b/mm/truncate.c
index 9dbf0b7..e5e2eda 100644 (file)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -193,27 +193,6 @@ static void truncate_cleanup_folio(struct folio *folio)
        folio_clear_mappedtodisk(folio);
 }
 
-/*
- * This is for invalidate_mapping_pages().  That function can be called at
- * any time, and is not supposed to throw away dirty pages.  But pages can
- * be marked dirty at any time too, so use remove_mapping which safely
- * discards clean, unused pages.
- *
- * Returns non-zero if the page was successfully invalidated.
- */
-static int
-invalidate_complete_page(struct address_space *mapping, struct page *page)
-{
-
-       if (page->mapping != mapping)
-               return 0;
-
-       if (page_has_private(page) && !try_to_release_page(page, 0))
-               return 0;
-
-       return remove_mapping(mapping, page);
-}
-
 int truncate_inode_folio(struct address_space *mapping, struct folio *folio)
 {
        if (folio->mapping != mapping)
@@ -309,7 +288,10 @@ int invalidate_inode_page(struct page *page)
                return 0;
        if (page_mapped(page))
                return 0;
-       return invalidate_complete_page(mapping, page);
+       if (page_has_private(page) && !try_to_release_page(page, 0))
+               return 0;
+
+       return remove_mapping(mapping, page);
 }
 
 /**
@@ -584,7 +566,7 @@ void invalidate_mapping_pagevec(struct address_space *mapping,
 }
 
 /*
- * This is like invalidate_complete_page(), except it ignores the page's
+ * This is like invalidate_inode_page(), except it ignores the page's
  * refcount.  We do this because invalidate_inode_pages2() needs stronger
  * invalidation guarantees, and cannot afford to leave pages behind because
  * shrink_page_list() has a temp ref on them, or because they're transiently