f2fs: always unlock the page in f2fs_write_single_data_page

Consolidate the code to unlock the page in f2fs_write_single_data_page
instead of leaving it to the callers for the AOP_WRITEPAGE_ACTIVATE case.
Replace AOP_WRITEPAGE_ACTIVATE with a positive return of 1 as this case
now doesn't match the historic ->writepage special return code that is
on it's way out now that ->writepage has been removed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: Christoph Hellwig

fs/f2fs/compress.c

@@ -1565,8 +1565,7 @@ static int f2fs_write_raw_pages(struct compress_ctx *cc,
 						NULL, NULL, wbc, io_type,
 						compr_blocks, false);
 		if (ret) {
-			if (ret == AOP_WRITEPAGE_ACTIVATE) {
-				folio_unlock(folio);
+			if (ret == 1) {
 				ret = 0;
 			} else if (ret == -EAGAIN) {
 				ret = 0;

fs/f2fs/data.c

@@ -2917,9 +2917,9 @@ int f2fs_write_single_data_page(struct folio *folio, int *submitted,
 	 * file_write_and_wait_range() will see EIO error, which is critical
 	 * to return value of fsync() followed by atomic_write failure to user.
 	 */
-	if (!err)
-		return AOP_WRITEPAGE_ACTIVATE;
 	folio_unlock(folio);
+	if (!err)
+		return 1;
 	return err;
 }
 
@@ -3133,8 +3133,6 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
 			ret = f2fs_write_single_data_page(folio,
 					&submitted, &bio, &last_block,
 					wbc, io_type, 0, true);
-			if (ret == AOP_WRITEPAGE_ACTIVATE)
-				folio_unlock(folio);
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 result:
 #endif
@@ -3146,7 +3144,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
 				 * keep nr_to_write, since vfs uses this to
 				 * get # of written pages.
 				 */
-				if (ret == AOP_WRITEPAGE_ACTIVATE) {
+				if (ret == 1) {
 					ret = 0;
 					goto next;
 				} else if (ret == -EAGAIN) {