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 ED262C43603 for ; Fri, 6 Dec 2019 14:46:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C351B20706 for ; Fri, 6 Dec 2019 14:46:03 +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="SU6t2k/3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726425AbfLFOqD (ORCPT ); Fri, 6 Dec 2019 09:46:03 -0500 Received: from mail-qt1-f194.google.com ([209.85.160.194]:45368 "EHLO mail-qt1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726268AbfLFOqC (ORCPT ); Fri, 6 Dec 2019 09:46:02 -0500 Received: by mail-qt1-f194.google.com with SMTP id p5so7308346qtq.12 for ; Fri, 06 Dec 2019 06:46:02 -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=JLk4SYGy37fJBjRDw7Ytdl7Bh55Sf6BqQikAUfeWGHU=; b=SU6t2k/3Hwh2cSzSXNj5sChGiEZY6UnPnKR6cVXcgZBLiWDQkU+5JJSo+iUvPbzVTn VuZOdsAXrN+h3SxZcv7Ea1/v3ZhB2APqjhzbhZgY1IQyHEygPj736A8vLFMhVC6xcNZu 8bzx+Lk78qW15UOf43HHYsWIMZLe2894cl0JubsYb/5YjXKMqaQjh6hUj2/sJW2kJM1S Hv1m3LH7AoWR2qoxDVMJCREToSzFy57N6wcKKgmFKDy7eqiuOg5/JyyCXIzl1/t9h4M3 dUC3I6ROI+OypTQA9jj7iTMqTPkYi4wCZBxO/uX7M1ZuACHH/A2gdIB3f+o74KAohapd erRA== 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=JLk4SYGy37fJBjRDw7Ytdl7Bh55Sf6BqQikAUfeWGHU=; b=O9jXEVBQeADHS3Tq6LtAh+9i9veFSb/R7qx3v7ksWA/Gthuij56L4cdU5bueDzcoe2 niUFTjXtIw2x7yDS5RtGaTvkFIhl1xX3gzfmIo7Y+v5G7/HW3IoRIjzFAtFxqmg6GK2O zuy15sE5mTVPp7ytqwzWYDPzlI8rTTtfFAMqVG+j2pLJSZlkoAXbg99i5i+jKkyn6Axn BiLs9BXBc8a/bquG1O6HLXA7+j+MDV5skcdIUfrOX+wK2fABHmSKNY3YrhOPk+XB2QYu zuR4VKVTNaqeeaI3+88MfHG2/gL4rt8b+CKwLZ6R1avs9Yz//8lgpTmiPcC9qzqv+DAY YKgg== X-Gm-Message-State: APjAAAVRXnZF03Eu8FtxeTCHaIp1HXGJEmo4ORx3HLVRgqOIC24cYNFU 8aw+5iiLNxq8voQFboytXMNKqnuUIyDXkw== X-Google-Smtp-Source: APXvYqxuGCfcgj6sQ/ColfmW6mSATnjlUBCBiPQtpUwS0QFzejYY7ChcFhLWXljva5Oop9zxGAjv7g== X-Received: by 2002:aed:3e82:: with SMTP id n2mr13101024qtf.367.1575643561582; Fri, 06 Dec 2019 06:46:01 -0800 (PST) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id j16sm6446356qta.59.2019.12.06.06.46.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Dec 2019 06:46:00 -0800 (PST) From: Josef Bacik To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH 11/44] btrfs: hold a ref on the root in resolve_indirect_ref Date: Fri, 6 Dec 2019 09:45:05 -0500 Message-Id: <20191206144538.168112-12-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 We're looking up a random root, we need to hold a ref on it while we're using it. Signed-off-by: Josef Bacik --- fs/btrfs/backref.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index e5d85311d5d5..193747b6e1f9 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -524,7 +524,13 @@ static int resolve_indirect_ref(struct btrfs_fs_info *fs_info, if (IS_ERR(root)) { srcu_read_unlock(&fs_info->subvol_srcu, index); ret = PTR_ERR(root); - goto out; + goto out_free; + } + + if (!btrfs_grab_fs_root(root)) { + srcu_read_unlock(&fs_info->subvol_srcu, index); + ret = -ENOENT; + goto out_free; } if (btrfs_is_testing(fs_info)) { @@ -577,6 +583,8 @@ static int resolve_indirect_ref(struct btrfs_fs_info *fs_info, ret = add_all_parents(root, path, parents, ref, level, time_seq, extent_item_pos, total_refs, ignore_offset); out: + btrfs_put_fs_root(root); +out_free: path->lowest_level = 0; btrfs_release_path(path); return ret; -- 2.23.0