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 ACDC4C43603 for ; Tue, 17 Dec 2019 15:37:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7F98B2067C for ; Tue, 17 Dec 2019 15:37:47 +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="0LhCFr1i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728641AbfLQPhq (ORCPT ); Tue, 17 Dec 2019 10:37:46 -0500 Received: from mail-qk1-f196.google.com ([209.85.222.196]:45069 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728130AbfLQPhq (ORCPT ); Tue, 17 Dec 2019 10:37:46 -0500 Received: by mail-qk1-f196.google.com with SMTP id x1so8563712qkl.12 for ; Tue, 17 Dec 2019 07:37:45 -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=melX/55R+mGKnJX2pY9dQE4ZsSx3WxtzyO6gYubI3RQ=; b=0LhCFr1ijQi9Odzx7ICMicUHkEVvZz+lb2dwhvs2nQo35VIgCdXEQWhqMZVgI145rz n4EbsKCMnhEbL5K/o6N7JekANxxN61yjdkcdFNoTZ5t7noDsUA1jq1nDBaA7w0DhulDk HWcd9OxWzoRJLF31nwUlOeLkXOHON+3RcqVVNnIeoq2L7coJyvmWA6xx36wo6N/hmuMV +DYBI63DbWWFVA5MgcVld0tYfkksWtovb0okzlRDiTt71momxZ3t3e2N6OqnyCfPyeBB dhnHgmOJYF5ZFm3IndCWs2tEcGIEcObIkeIbZh8hy7c/cD23paa0GALzQjFb9s1bY9Pa uxnw== 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=melX/55R+mGKnJX2pY9dQE4ZsSx3WxtzyO6gYubI3RQ=; b=nfyPnb5QH7DcnxBnnpI603p3nhDrRSBlO+ealLyYs9BAWmyGUM14et2ChHjDfQDIY+ bF7Y6lol0pjmZj+Ok/YObqz4U7RAwlBRJPIg4epYDEI41i1oq5hlMwG/0yrBikyEBRcz F1ms2KKyHCiO9tc1etvL0GVeaJRZGFpkKzTLaggyQPOIHV95isgYBK2eWyFhF0QcKNyt nA4U9gIafBDEQIRqjnkl4KOb3qhnDUZS8OwKeIof5Ei7NaHV3TGeUrQRAnh3LKm1mgSw f3G+ee34ssO+8PkT5BvYs2E8/NYSEbL5ETqVehbbgnRBD8UCnpx4yuskBqRAykVAxJav b2IQ== X-Gm-Message-State: APjAAAXu7ojt1+QrnN60moWeLWv0O3VVWoSPcDLZLsTQyp+3KZM15n0M A2bnyey/mwYioK2DLIx8hUta43Ra8khLHA== X-Google-Smtp-Source: APXvYqwZS5f61qb1VOzcLmgyRSnVbsMvXcqnweMjzm7UQHWMberMIYInwh70rQwRgPHTbqQNCQbfPQ== X-Received: by 2002:a37:644:: with SMTP id 65mr5709468qkg.309.1576597064963; Tue, 17 Dec 2019 07:37:44 -0800 (PST) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id b81sm7102689qkc.135.2019.12.17.07.37.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Dec 2019 07:37:44 -0800 (PST) From: Josef Bacik To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH 37/45] btrfs: hold a ref on the root in btrfs_check_uuid_tree_entry Date: Tue, 17 Dec 2019 10:36:27 -0500 Message-Id: <20191217153635.44733-38-josef@toxicpanda.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191217153635.44733-1-josef@toxicpanda.com> References: <20191217153635.44733-1-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 lookup the uuid of arbitrary subvolumes, hold a ref on the root while we're doing this. Signed-off-by: Josef Bacik --- fs/btrfs/volumes.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 904c3e03467f..47ac3277ee08 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4379,6 +4379,10 @@ static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info, ret = 1; goto out; } + if (!btrfs_grab_fs_root(subvol_root)) { + ret = 1; + goto out; + } switch (type) { case BTRFS_UUID_KEY_SUBVOL: @@ -4391,7 +4395,7 @@ static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info, ret = 1; break; } - + btrfs_put_fs_root(subvol_root); out: return ret; } -- 2.23.0