f2fs: Convert to filemap_migrate_folio()

filemap_migrate_folio() fits f2fs's needs perfectly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Chao Yu <chao@kernel.org>

fs/f2fs/checkpoint.c

@@ -463,9 +463,7 @@ const struct address_space_operations f2fs_meta_aops = {
 	.dirty_folio	= f2fs_dirty_meta_folio,
 	.invalidate_folio = f2fs_invalidate_folio,
 	.release_folio	= f2fs_release_folio,
-#ifdef CONFIG_MIGRATION
-	.migratepage    = f2fs_migrate_page,
-#endif
+	.migrate_folio	= filemap_migrate_folio,
 };
 
 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino,

fs/f2fs/data.c

@@ -3751,42 +3751,6 @@ static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
 	return blknr;
 }
 
-#ifdef CONFIG_MIGRATION
-#include <linux/migrate.h>
-
-int f2fs_migrate_page(struct address_space *mapping,
-		struct page *newpage, struct page *page, enum migrate_mode mode)
-{
-	int rc, extra_count = 0;
-
-	BUG_ON(PageWriteback(page));
-
-	rc = migrate_page_move_mapping(mapping, newpage,
-				page, extra_count);
-	if (rc != MIGRATEPAGE_SUCCESS)
-		return rc;
-
-	/* guarantee to start from no stale private field */
-	set_page_private(newpage, 0);
-	if (PagePrivate(page)) {
-		set_page_private(newpage, page_private(page));
-		SetPagePrivate(newpage);
-		get_page(newpage);
-
-		set_page_private(page, 0);
-		ClearPagePrivate(page);
-		put_page(page);
-	}
-
-	if (mode != MIGRATE_SYNC_NO_COPY)
-		migrate_page_copy(newpage, page);
-	else
-		migrate_page_states(newpage, page);
-
-	return MIGRATEPAGE_SUCCESS;
-}
-#endif
-
 #ifdef CONFIG_SWAP
 static int f2fs_migrate_blocks(struct inode *inode, block_t start_blk,
 							unsigned int blkcnt)
@@ -4018,15 +3982,13 @@ const struct address_space_operations f2fs_dblock_aops = {
 	.write_begin	= f2fs_write_begin,
 	.write_end	= f2fs_write_end,
 	.dirty_folio	= f2fs_dirty_data_folio,
+	.migrate_folio	= filemap_migrate_folio,
 	.invalidate_folio = f2fs_invalidate_folio,
 	.release_folio	= f2fs_release_folio,
 	.direct_IO	= noop_direct_IO,
 	.bmap		= f2fs_bmap,
 	.swap_activate  = f2fs_swap_activate,
 	.swap_deactivate = f2fs_swap_deactivate,
-#ifdef CONFIG_MIGRATION
-	.migratepage    = f2fs_migrate_page,
-#endif
 };
 
 void f2fs_clear_page_cache_dirty_tag(struct page *page)

fs/f2fs/f2fs.h

@@ -3764,10 +3764,6 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
 void f2fs_write_failed(struct inode *inode, loff_t to);
 void f2fs_invalidate_folio(struct folio *folio, size_t offset, size_t length);
 bool f2fs_release_folio(struct folio *folio, gfp_t wait);
-#ifdef CONFIG_MIGRATION
-int f2fs_migrate_page(struct address_space *mapping, struct page *newpage,
-			struct page *page, enum migrate_mode mode);
-#endif
 bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len);
 void f2fs_clear_page_cache_dirty_tag(struct page *page);
 int f2fs_init_post_read_processing(void);

fs/f2fs/node.c

@@ -2165,9 +2165,7 @@ const struct address_space_operations f2fs_node_aops = {
 	.dirty_folio	= f2fs_dirty_node_folio,
 	.invalidate_folio = f2fs_invalidate_folio,
 	.release_folio	= f2fs_release_folio,
-#ifdef CONFIG_MIGRATION
-	.migratepage	= f2fs_migrate_page,
-#endif
+	.migrate_folio	= filemap_migrate_folio,
 };
 
 static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,