f2fs: enable inline dir handling

Add inline dir functions into normal dir ops' function to handle inline ops.
Besides, we enable inline dir mode when a new dir inode is created if
inline_data option is on.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/recovery.c

@@ -129,7 +129,8 @@ retry:
 	goto out;
 
 out_unmap_put:
-	kunmap(page);
+	if (!f2fs_has_inline_dentry(dir))
+		kunmap(page);
 	f2fs_put_page(page, 0);
 out_err:
 	iput(dir);