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 6DA0215AE7 for ; Wed, 20 Sep 2023 12:18:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0936C433CB; Wed, 20 Sep 2023 12:18:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695212304; bh=fSY53SQdvcIwPOSUz7KQ1PwtYTiXS1cqkK8gRQDR9Q4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XFKZM4IFlyU0tQrRO3rZdw5u7LuBAn1aEsIkopJuJDG8s0AEfI0Ue0HPXmu8mENsk 0W/Q587MyZV8uf3c5KiUilrxT0eGSh5JzsxiqcVGcVav/Zz8z6j0P6C143VFNOuxxo UDBJCOK4azaFYi/HMWDBkLykJYfghLD8stNKRWww= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Filipe Manana , David Sterba Subject: [PATCH 4.19 226/273] btrfs: dont start transaction when joining with TRANS_JOIN_NOSTART Date: Wed, 20 Sep 2023 13:31:06 +0200 Message-ID: <20230920112853.382803266@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112846.440597133@linuxfoundation.org> References: <20230920112846.440597133@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 4.19-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 @@ -200,10 +200,11 @@ 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; /*