From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BCDFDC2D0DB for ; Fri, 24 Jan 2020 14:33:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9315820661 for ; Fri, 24 Jan 2020 14:33:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=toxicpanda-com.20150623.gappssmtp.com header.i=@toxicpanda-com.20150623.gappssmtp.com header.b="Zxv9jxC9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404374AbgAXOd3 (ORCPT ); Fri, 24 Jan 2020 09:33:29 -0500 Received: from mail-qt1-f194.google.com ([209.85.160.194]:45167 "EHLO mail-qt1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404315AbgAXOd2 (ORCPT ); Fri, 24 Jan 2020 09:33:28 -0500 Received: by mail-qt1-f194.google.com with SMTP id d9so1606558qte.12 for ; Fri, 24 Jan 2020 06:33:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=SAiiIaHYxAwFxdCh+4UtFgo8Rs8ZoelHWG4/dfLjKQs=; b=Zxv9jxC9O2t4X6HlWcGH5uvCZwr6BnjpCM19D4FLJvh/64jgm9laVFaQ1t+/sdE653 PuWKBy7DgSk208BcLQt0nQGllAiceu4fcxD6AKlEZX2Fy4ZdkojZ2h0QRZqvYvJahfUJ n7JHTfZ1kJOW/KOIENGQPD13pMwtkRSKX6ZnqxkK7kq9L54Vg4kdQorsZlm5Og5dGLW8 ey18qzN+NmKcwzCpU+O/ygODJrjbwB3fHY2hiYZScMbc/0q5KH52Dv2oA446yQF0ZfZy 4B+bnO7IW7FnSb0PtcG9We78kzRD6a36CxX8BQXfXOLJC3TtFtmo5hLGaZM/GJIos7Lv gw3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=SAiiIaHYxAwFxdCh+4UtFgo8Rs8ZoelHWG4/dfLjKQs=; b=mgfjAo368Zlo6+3ImIlP3+seb6VzlonsjCvewq1P8dDekyWJcC2ZJW/xQUXm/1idOZ 4tc6r+fqpv789CZC/3Tib/NBk+BdinuC1E4JXOY7WF2EHwfBI2EzqZSAVgipx9S2ig/z rl7C6jIqZZgwc8fL+gc2EQfK5D8vkWBKswju/zspUHV9nZWILJOWMCB93M8nni7U1wbk 0UbDp7heSLW3iQYGNkp+4t2EgP+66tOpwWqgnmLwz1tzpYziTKGU5fY84oxiSQdurSBC XBtEatCC3EIxLa/KRv+uVLGtX6Tz9sf5MsIWOKSTue04IheoOwjHVLrhJrPcigF02MS4 CXPA== X-Gm-Message-State: APjAAAUcWUcAtYPhxqsZk5yYgZvpaEStvQ2HTuDKzRDI8koFWNIDAUzh mte6I+6nYLQQINd1BY6EU9n7Sb9tN3EW9Q== X-Google-Smtp-Source: APXvYqwQUVLcQK1G6s3zpQ3IwuzQ0UL+MqkQTBvnSmnLPR7Nz0OnHWa2fjVftJ01yoWZxZzU1Nt3ng== X-Received: by 2002:ac8:7188:: with SMTP id w8mr2389732qto.139.1579876407063; Fri, 24 Jan 2020 06:33:27 -0800 (PST) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id n20sm3038187qkk.54.2020.01.24.06.33.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jan 2020 06:33:26 -0800 (PST) From: Josef Bacik To: kernel-team@fb.com, linux-btrfs@vger.kernel.org Subject: [PATCH 14/44] btrfs: hold a ref on the root in fixup_tree_root_location Date: Fri, 24 Jan 2020 09:32:31 -0500 Message-Id: <20200124143301.2186319-15-josef@toxicpanda.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200124143301.2186319-1-josef@toxicpanda.com> References: <20200124143301.2186319-1-josef@toxicpanda.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Looking up the inode from an arbitrary tree means we need to hold a ref on that root. Signed-off-by: Josef Bacik --- fs/btrfs/inode.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 8cd1b11c3151..85104886c1e7 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5026,6 +5026,10 @@ static int fixup_tree_root_location(struct btrfs_fs_info *fs_info, err = PTR_ERR(new_root); goto out; } + if (!btrfs_grab_fs_root(new_root)) { + err = -ENOENT; + goto out; + } *sub_root = new_root; location->objectid = btrfs_root_dirid(&new_root->root_item); @@ -5268,6 +5272,8 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) } else { inode = btrfs_iget(dir->i_sb, &location, sub_root); } + if (root != sub_root) + btrfs_put_fs_root(sub_root); srcu_read_unlock(&fs_info->subvol_srcu, index); if (!IS_ERR(inode) && root != sub_root) { -- 2.24.1