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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36B52C4332F for ; Tue, 15 Nov 2022 16:12:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232856AbiKOQMg (ORCPT ); Tue, 15 Nov 2022 11:12:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229791AbiKOQMe (ORCPT ); Tue, 15 Nov 2022 11:12:34 -0500 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F72E1D65A; Tue, 15 Nov 2022 08:12:33 -0800 (PST) Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.54]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4NBWQn1FW7zHvsk; Wed, 16 Nov 2022 00:12:01 +0800 (CST) Received: from kwepemm600015.china.huawei.com (7.193.23.52) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 16 Nov 2022 00:12:31 +0800 Received: from huawei.com (10.175.101.6) by kwepemm600015.china.huawei.com (7.193.23.52) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 16 Nov 2022 00:12:30 +0800 From: ChenXiaoSong To: , , CC: , , , , , , Subject: [PATCH v4 0/3] btrfs: fix sleep from invalid context bug in update_qgroup_limit_item() Date: Wed, 16 Nov 2022 01:17:06 +0800 Message-ID: <20221115171709.3774614-1-chenxiaosong2@huawei.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To kwepemm600015.china.huawei.com (7.193.23.52) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org At least 3 places might sleep in update_qgroup_limit_item(), as shown below: update_qgroup_limit_item btrfs_alloc_path /* allocate memory non-atomically, might sleep */ kmem_cache_zalloc(btrfs_path_cachep, GFP_NOFS) btrfs_search_slot setup_nodes_for_search reada_for_balance btrfs_readahead_node_child btrfs_readahead_tree_block btrfs_find_create_tree_block alloc_extent_buffer kmem_cache_zalloc /* allocate memory non-atomically, might sleep */ kmem_cache_alloc(GFP_NOFS|__GFP_NOFAIL|__GFP_ZERO) read_extent_buffer_pages submit_extent_page /* disk IO, might sleep */ submit_one_bio Fix this by delaying the limit item updates until unlock the spin lock. By the way, add might_sleep() to some places. ChenXiaoSong (3): btrfs: add might_sleep() to some places in update_qgroup_limit_item() btrfs: qgroup: introduce btrfs_update_quoto_limit() helper btrfs: qgroup: fix sleep from invalid context bug in update_qgroup_limit_item() fs/btrfs/ctree.c | 2 ++ fs/btrfs/qgroup.c | 45 ++++++++++++++++++++++++++------------------- 2 files changed, 28 insertions(+), 19 deletions(-) -- 2.31.1