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 4148AC43603 for ; Fri, 6 Dec 2019 14:46:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 117A720706 for ; Fri, 6 Dec 2019 14:46:12 +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="xXYBNmkr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726483AbfLFOqL (ORCPT ); Fri, 6 Dec 2019 09:46:11 -0500 Received: from mail-qt1-f193.google.com ([209.85.160.193]:35671 "EHLO mail-qt1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726268AbfLFOqL (ORCPT ); Fri, 6 Dec 2019 09:46:11 -0500 Received: by mail-qt1-f193.google.com with SMTP id s8so7378170qte.2 for ; Fri, 06 Dec 2019 06:46:10 -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=SIQ/P7FQ7arouhkzuzw7ujgnmYAn8fc5SJbQDjIRoc8=; b=xXYBNmkrjhtPCCd7qQ9EuT/RyTK5mGFB0OETubmV/vpFiBR4qg7Oai9edk3UVw3+wX eKCMaqFa9dtEoZJ/VKuq/FU628uyyM/9L+asCeX3GlDM3aWQsMAJH3Lrx5BYJ5bja1Kd oB2ZP2OD7IPGrKG4A/VMVYCGufB83is2XvSXym2EF6RerJ8qKZnjjIBGO5d7qfzZMMeG 7mKBXjWQhsHx2Rgmab2GE6VXey6yYjGC6JVI+fcomEObcLSm9oA3dbHZI7A9Stifl23Q b0jg7TcMQ45FM07YHev6sNGuUsn3Q69/VnRCFmeRd6jw0DgpLacRXiZ4XaDRcnMygGej gBfQ== 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=SIQ/P7FQ7arouhkzuzw7ujgnmYAn8fc5SJbQDjIRoc8=; b=W9YxsboJQQDaIKc1N9lHVibJJ62fg6k4UgxIpKIAmHj2ixtJfKNl79KcGwng9opPGw V4Hb+eQeRkriOxXwrYrZt7uMhJUj6lHFz0+YBc38kKRhDXzDinosBmN06HP3dR2dxcpL Xgi0dcdx4kMR35eoxE8RBSyTDVl/Ug9cgFPPdNIGYQqe6f9ElbFL843ShjbtpsiYyY8z clawt2nzs01wjHrEel/ovz+/oRz09R/Zd2DDXXZlbnCjtSuGe7geJvfBsemB/E0PWMud AgmKc7F6Bp3yQDud2I6Zkms32M2m5yQe3ic+utonnSN/tt8wuHgmyCEhlZCEboe+9YGc llzQ== X-Gm-Message-State: APjAAAXy6AU7fe38K/cuEGqoq1LV6SNxg0ba6spAuda00JZbfXH5arl+ zx5CzmlJFy4cS4CIhZ4nYU/xa7+bzBGKXQ== X-Google-Smtp-Source: APXvYqySOhB6bsGxRJL14qL4zfc7yEEZ6WaPGhECTv6RzAf3qUkWVYVBBPQQfWEucK5zf07UQ/fhVg== X-Received: by 2002:ac8:c4f:: with SMTP id l15mr12951958qti.177.1575643569734; Fri, 06 Dec 2019 06:46:09 -0800 (PST) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id d13sm5990070qkk.136.2019.12.06.06.46.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Dec 2019 06:46:09 -0800 (PST) From: Josef Bacik To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH 16/44] btrfs: hold a ref on the root in fixup_tree_root_location Date: Fri, 6 Dec 2019 09:45:10 -0500 Message-Id: <20191206144538.168112-17-josef@toxicpanda.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191206144538.168112-1-josef@toxicpanda.com> References: <20191206144538.168112-1-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 3dc9bc9530e2..5fa39ac23472 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5689,6 +5689,10 @@ 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); @@ -5927,6 +5931,8 @@ 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) { -- 2.23.0