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 7FA5E2ED848; Tue, 4 Nov 2025 12:12:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762258368; cv=none; b=MavRarQ5f3CzPKT8M+YUKB7iUcZHPOvij9WTqDGNp61ZwotZ4gnkSzTO/jovnC++4gV0tNUHU1HB/AG7HMLdTJUAiXpvYtG0IZldpw9uyhHrF8di4vVv4EztzUS1WP5T4DnXKGBGMuM6lkLjYWm9vjNGabg1/u0N8SrL603LSWk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762258368; c=relaxed/simple; bh=A+9Gi5oaDByYdwSalbpWdwyS0pZJtiHOYC0TEbxSuHg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=g7Jdmw3VR/Ckgr0VIHWMsqfEHPVPBR2KgAHXblCbYsS7uW7Qyz0XSGAii3WjhRAUdk/KduH49aN7CD04uflVgds4MAPknRZquRS5XoxAA0ceOpPbDN70Y/UHPmZRNbnQtAU8rMHHBhbJ1rsymhwUBoIPIbdRWVbeH+Amy2xcKyw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=t1ICki7g; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="t1ICki7g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83B5AC116C6; Tue, 4 Nov 2025 12:12:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762258367; bh=A+9Gi5oaDByYdwSalbpWdwyS0pZJtiHOYC0TEbxSuHg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=t1ICki7gPPLcAPvJOYvq2lnw0N2LJQX42cgOE342VcvT/uUpOf8Bh7PcGVaW9i3p9 9GdU//jAoMAUyWw/wZ0pulQZngSxgt5KzWyOnmJ1iFhxfmTN7wYXVqmGvnAcNMVwQu M4+/35RkwarTAGXEh1RTuYk0y6wZcaK/O/guGD6j+l+e5W472z0klOoSo6h3+M0Kq2 0E3jz4+xJm5DVj2B9yQsVhXwA0Ok9m/XFXknhC35zB2g9z7yi+Hd/tSrGwQVej3QQE RolKBkmjHJaNO0/0B1xo+k2KZnDa6hhSR/saPmdAfxWwVEpbql8ycraKP6ZzqXL653 Izp3EXd+jLong== From: Christian Brauner Date: Tue, 04 Nov 2025 13:12:33 +0100 Subject: [PATCH RFC 4/8] btrfs: use super write guard in sb_start_write() Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251104-work-guards-v1-4-5108ac78a171@kernel.org> References: <20251104-work-guards-v1-0-5108ac78a171@kernel.org> In-Reply-To: <20251104-work-guards-v1-0-5108ac78a171@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Alexander Viro , Jan Kara , linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Christian Brauner X-Mailer: b4 0.15-dev-a6db3 X-Developer-Signature: v=1; a=openpgp-sha256; l=626; i=brauner@kernel.org; h=from:subject:message-id; bh=A+9Gi5oaDByYdwSalbpWdwyS0pZJtiHOYC0TEbxSuHg=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWRyvt1il5m2Z0Z3QUr8/Qt2zovFWA/JsPSnhVwpKQl5w yFutkW+o5SFQYyLQVZMkcWh3SRcbjlPxWajTA2YOaxMIEMYuDgFYCIlRxkZfqwr//HBiKH+C8s1 x+unjVezxy+bvTXRo+VcrPXKh6mT5jMynDh2TM3iLUfghydZp9Y/E47is3SIaDnf/Ogay7WFnxR 52AE= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Signed-off-by: Christian Brauner --- fs/btrfs/volumes.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 2bec544d8ba3..4152b0a5537a 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4660,7 +4660,8 @@ static int balance_kthread(void *data) struct btrfs_fs_info *fs_info = data; int ret = 0; - sb_start_write(fs_info->sb); + guard(super_write)(fs_info->sb); + mutex_lock(&fs_info->balance_mutex); if (fs_info->balance_ctl) ret = btrfs_balance(fs_info, fs_info->balance_ctl, NULL); -- 2.47.3