[PATCH 02/20] mm/migrate: Convert fallback_migrate_page() to fallback_migrate_folio()

Matthew Wilcox (Oracle)
2022-06-06T20:42:27Z

Use a folio throughout. migrate_page() will be converted to
migrate_folio() later.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
mm/migrate.c | 19 +++++++++----------
1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 75cb6aa38988..d772ce63d7e2 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -806,11 +806,11 @@ static int writeout(struct address_space *mapping, struct page *page)
/*
* Default handling if a filesystem does not provide a migration function.
*/
-static int fallback_migrate_page(struct address_space *mapping,
- struct page *newpage, struct page *page, enum migrate_mode mode)
+static int fallback_migrate_folio(struct address_space *mapping,
+ struct folio *dst, struct folio *src, enum migrate_mode mode)
{
- if (PageDirty(page)) {
- /* Only writeback pages in full synchronous migration */
+ if (folio_test_dirty(src)) {
+ /* Only writeback folios in full synchronous migration */
switch (mode) {
case MIGRATE_SYNC:
case MIGRATE_SYNC_NO_COPY:
@@ -818,18 +818,18 @@ static int fallback_migrate_page(struct address_space *mapping,
default:
return -EBUSY;
}
- return writeout(mapping, page);
+ return writeout(mapping, &src->page);
}

/*
* Buffers may be managed in a filesystem specific way.
* We must have no buffers or drop them.
*/
- if (page_has_private(page) &&
- !try_to_release_page(page, GFP_KERNEL))
+ if (folio_test_private(src) &&
+ !filemap_release_folio(src, GFP_KERNEL))
return mode == MIGRATE_SYNC ? -EAGAIN : -EBUSY;

- return migrate_page(mapping, newpage, page, mode);
+ return migrate_page(mapping, &dst->page, &src->page, mode);
}

/*
@@ -872,8 +872,7 @@ static int move_to_new_folio(struct folio *dst, struct folio *src,
rc = mapping->a_ops->migratepage(mapping, &dst->page,
&src->page, mode);
else
- rc = fallback_migrate_page(mapping, &dst->page,
- &src->page, mode);
+ rc = fallback_migrate_folio(mapping, dst, src, mode);
} else {
/*
* In case of non-lru page, it could be released after
--
2.35.1