From patchwork Fri Jan 17 13:47:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josef Bacik X-Patchwork-Id: 11339173 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 397FA1398 for ; Fri, 17 Jan 2020 13:49:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 184CD2072B for ; Fri, 17 Jan 2020 13:49:04 +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="SFazhMZf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729137AbgAQNtD (ORCPT ); Fri, 17 Jan 2020 08:49:03 -0500 Received: from mail-qv1-f66.google.com ([209.85.219.66]:41270 "EHLO mail-qv1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727285AbgAQNtB (ORCPT ); Fri, 17 Jan 2020 08:49:01 -0500 Received: by mail-qv1-f66.google.com with SMTP id x1so10719503qvr.8 for ; Fri, 17 Jan 2020 05:49:01 -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=7dXPcLtcCSCDRGETr4vm+QgKm0KbD9S2RIf4ehLy/AM=; b=SFazhMZf7X3TV993wk9WSR8gA+6c7psqbxXlK9XzjhpHn5XQsMeX0jtf3+s/SGzKfM lMMFLchJvAXgDy943vu1voG1IfZvc6rH1c3hpLy2IYPSV0QN1GhTm6FRvuhNiBuSmuwO vcapNLIjuWrtfwACKrSqEFVOYJheI/oEA0QQoFH2jQCOCtgsR6yXAlizgfINr037CywG JZsbxqHqJNo4ZlKoNuKKrOC9O+jASDf05DdKOWc6LnbLZKqOohPTdNlD4RVAr5ypsmR+ yXvszwKxqSQDuneyYG6Po4solUxFWQUReU3+dAgkD6ivUzWwQIZ1FEWcayecznACfVup 0L3w== 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=7dXPcLtcCSCDRGETr4vm+QgKm0KbD9S2RIf4ehLy/AM=; b=i3awGlc79RwMISDQPurOb9H3jvuzZ0PxkJUB2uoqVkMfNkTls0WrmfpNBk3H4h0LyQ ytuO6A6xSZQEsxegvHagLxk674DQmLmGBOFy4O2Diu0EuVyumNHGYaFbo/dUxfiQWcRg QtjRY0GvCWqnN8LGuEKx7wCFNsL5KWhl4WF3ye8+oaA/+yfzBnE8wAyYWmePn/xDHxjO Du7YFJ2Yhvqip3Jlv0+AH4TTTurCid+9xbB7ryHhzAN73lVZqfWTHye8er1HarZCqx0J V3tVVe7n9aCPcaLSQF5sQkSor64Da6HoDtPkvY4utffekT/ROziELzg0j2kgTB/Zc6l3 ZH8w== X-Gm-Message-State: APjAAAUREhAJeBLHZ4JI/f56AftRNLatW6DK6wGPD/hlYTE+GJgH8IRy 5jLRfwtSfhp6n5IYM7Pu0RmRnjcrkDe11A== X-Google-Smtp-Source: APXvYqy4fsYDdx0XkLA43Zb9tD4v/k+wlmu2m/Msq+NxVN16Xnonf2lYUG3d9TXMNOohuca8WdPIbA== X-Received: by 2002:a0c:eacb:: with SMTP id y11mr8004450qvp.68.1579268940303; Fri, 17 Jan 2020 05:49:00 -0800 (PST) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id o6sm11543944qkk.53.2020.01.17.05.48.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Jan 2020 05:48:59 -0800 (PST) From: Josef Bacik To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH 35/43] btrfs: hold a ref on the root in btrfs_check_uuid_tree_entry Date: Fri, 17 Jan 2020 08:47:50 -0500 Message-Id: <20200117134758.41494-36-josef@toxicpanda.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200117134758.41494-1-josef@toxicpanda.com> References: <20200117134758.41494-1-josef@toxicpanda.com> MIME-Version: 1.0 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 ce3eff93c366..527b0b41ebdc 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4382,6 +4382,10 @@ 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: @@ -4394,7 +4398,7 @@ 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; }