The quilt patch titled
Subject: mm: add folio_flush_mapping()
has been removed from the -mm tree. Its filename was
mm-add-folio_flush_mapping.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: add folio_flush_mapping()
Date: Wed, 2 Aug 2023 16:13:32 +0100
This is the folio equivalent of page_mapping_file(), but rename it to make
it clear that it's very different from page_file_mapping().
Theoretically, there's nothing flush-only about it, but there are no other
users today, and I doubt there will be; it's almost always more useful to
know the swapfile's mapping or the swapcache's mapping.
Link: https://lkml.kernel.org/r/20230802151406.3735276-5-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Acked-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)
--- a/include/linux/pagemap.h~mm-add-folio_flush_mapping
+++ a/include/linux/pagemap.h
@@ -389,6 +389,26 @@ static inline struct address_space *foli
return folio->mapping;
}
+/**
+ * folio_flush_mapping - Find the file mapping this folio belongs to.
+ * @folio: The folio.
+ *
+ * For folios which are in the page cache, return the mapping that this
+ * page belongs to. Anonymous folios return NULL, even if they're in
+ * the swap cache. Other kinds of folio also return NULL.
+ *
+ * This is ONLY used by architecture cache flushing code. If you aren't
+ * writing cache flushing code, you want either folio_mapping() or
+ * folio_file_mapping().
+ */
+static inline struct address_space *folio_flush_mapping(struct folio *folio)
+{
+ if (unlikely(folio_test_swapcache(folio)))
+ return NULL;
+
+ return folio_mapping(folio);
+}
+
static inline struct address_space *page_file_mapping(struct page *page)
{
return folio_file_mapping(page_folio(page));
@@ -399,11 +419,7 @@ static inline struct address_space *page
*/
static inline struct address_space *page_mapping_file(struct page *page)
{
- struct folio *folio = page_folio(page);
-
- if (unlikely(folio_test_swapcache(folio)))
- return NULL;
- return folio_mapping(folio);
+ return folio_flush_mapping(page_folio(page));
}
/**
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
