ext4: rename: move EMLINK check up

Move checking i_nlink from after ext4_get_first_dir_block() to before.  The
check doesn't rely on the result of that function and the function only
fails on fs corruption, so the order shouldn't matter.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>

fs/ext4/namei.c

@@ -3084,6 +3084,10 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 			retval = -ENOTEMPTY;
 			if (!empty_dir(new.inode))
 				goto end_rename;
+		} else {
+			retval = -EMLINK;
+			if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
+				goto end_rename;
 		}
 		retval = -EIO;
 		old.dir_bh = ext4_get_first_dir_block(handle, old.inode,
@@ -3093,10 +3097,6 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 			goto end_rename;
 		if (le32_to_cpu(old.parent_de->inode) != old.dir->i_ino)
 			goto end_rename;
-		retval = -EMLINK;
-		if (!new.inode && new.dir != old.dir &&
-		    EXT4_DIR_LINK_MAX(new.dir))
-			goto end_rename;
 		BUFFER_TRACE(old.dir_bh, "get_write_access");
 		retval = ext4_journal_get_write_access(handle, old.dir_bh);
 		if (retval)