f2fs: use generic terms used for encrypted block management

This patch renames functions regarding to buffer management via META_MAPPING
used for encrypted blocks especially. We can actually use them in generic way.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 1ef9dd4..5a29a0c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1162,7 +1162,7 @@
 			return ERR_CAST(ctx);
 
 		/* wait the page to be moved by cleaning */
-		f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr);
+		f2fs_wait_on_block_writeback(sbi, blkaddr);
 	}
 
 	bio = bio_alloc(GFP_KERNEL, min_t(int, nr_pages, BIO_MAX_PAGES));
@@ -1348,7 +1348,7 @@
 		return 0;
 
 	/* wait for GCed encrypted page writeback */
-	f2fs_wait_on_encrypted_page_writeback(fio->sbi, fio->old_blkaddr);
+	f2fs_wait_on_block_writeback(fio->sbi, fio->old_blkaddr);
 
 retry_encrypt:
 	fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page,
@@ -1974,7 +1974,7 @@
 
 	/* wait for GCed encrypted page writeback */
 	if (f2fs_encrypted_file(inode))
-		f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr);
+		f2fs_wait_on_block_writeback(sbi, blkaddr);
 
 	if (len == PAGE_SIZE || PageUptodate(page))
 		return 0;