mm/migrate: Convert fallback_migrate_page() to fallback_migrate_folio()

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

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

diff --git a/mm/migrate.c b/mm/migrate.c
index 3c3c168..c527844 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -805,11 +805,11 @@ 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:
@@ -817,18 +817,18 @@ 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);
 }
 
 /*
@@ -870,8 +870,7 @@ 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 {
                const struct movable_operations *mops;