From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0553315AD3 for ; Wed, 20 Sep 2023 12:39:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7AB2EC433CC; Wed, 20 Sep 2023 12:39:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695213558; bh=4lPzXCtNT94OWHky/5+DeZDyLX6NcB1TB4MGZ74IQ9s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hfkvrGPFe+9C2Bsp1SqBM7OdG5yaJiwtbao75WYNu+hhKFOqhsokImOcMPI9Hrfu9 H5QDn4JGeE/p/jGv2bniMnI7bc36u/N+XAV951r7uI/EB5SYjVrFsPCBHYWQPBoEyL 8i4MNGD/GDbDnDdNJ0ZXu/2BswqdKpkrGLVaBnwY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Filipe Manana , David Sterba Subject: [PATCH 5.4 282/367] btrfs: dont start transaction when joining with TRANS_JOIN_NOSTART Date: Wed, 20 Sep 2023 13:30:59 +0200 Message-ID: <20230920112905.864100438@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112858.471730572@linuxfoundation.org> References: <20230920112858.471730572@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Filipe Manana commit 4490e803e1fe9fab8db5025e44e23b55df54078b upstream. When joining a transaction with TRANS_JOIN_NOSTART, if we don't find a running transaction we end up creating one. This goes against the purpose of TRANS_JOIN_NOSTART which is to join a running transaction if its state is at or below the state TRANS_STATE_COMMIT_START, otherwise return an -ENOENT error and don't start a new transaction. So fix this to not create a new transaction if there's no running transaction at or below that state. CC: stable@vger.kernel.org # 4.14+ Fixes: a6d155d2e363 ("Btrfs: fix deadlock between fiemap and transaction commits") Signed-off-by: Filipe Manana Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/transaction.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -190,10 +190,11 @@ loop: spin_unlock(&fs_info->trans_lock); /* - * If we are ATTACH, we just want to catch the current transaction, - * and commit it. If there is no transaction, just return ENOENT. + * If we are ATTACH or TRANS_JOIN_NOSTART, we just want to catch the + * current transaction, and commit it. If there is no transaction, just + * return ENOENT. */ - if (type == TRANS_ATTACH) + if (type == TRANS_ATTACH || type == TRANS_JOIN_NOSTART) return -ENOENT; /*