From nobody Mon Apr 13 17:20:05 2026 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 A29EEC433FE for ; Tue, 15 Nov 2022 16:12:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238220AbiKOQMj (ORCPT ); Tue, 15 Nov 2022 11:12:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33612 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232114AbiKOQMf (ORCPT ); Tue, 15 Nov 2022 11:12:35 -0500 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6951B1DF3E; Tue, 15 Nov 2022 08:12:34 -0800 (PST) Received: from dggemv711-chm.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4NBWR15ZtrzRpGL; Wed, 16 Nov 2022 00:12:13 +0800 (CST) Received: from kwepemm600015.china.huawei.com (7.193.23.52) by dggemv711-chm.china.huawei.com (10.1.198.66) 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 00:12:32 +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 1/3] btrfs: add might_sleep() to some places in update_qgroup_limit_item() Date: Wed, 16 Nov 2022 01:17:07 +0800 Message-ID: <20221115171709.3774614-2-chenxiaosong2@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221115171709.3774614-1-chenxiaosong2@huawei.com> References: <20221115171709.3774614-1-chenxiaosong2@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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 Content-Type: text/plain; charset="utf-8" As the potential sleeping under spin lock is hard to spot, we should add might_sleep() to some places. Signed-off-by: ChenXiaoSong Reviewed-by: Qu Wenruo --- fs/btrfs/ctree.c | 2 ++ fs/btrfs/qgroup.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index a9543f01184c..809053e9cfde 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1934,6 +1934,8 @@ int btrfs_search_slot(struct btrfs_trans_handle *tran= s, struct btrfs_root *root, int min_write_lock_level; int prev_cmp; =20 + might_sleep(); + lowest_level =3D p->lowest_level; WARN_ON(lowest_level && ins_len > 0); WARN_ON(p->nodes[0] !=3D NULL); diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 9334c3157c22..d0480b9c6c86 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -779,6 +779,8 @@ static int update_qgroup_limit_item(struct btrfs_trans_= handle *trans, int ret; int slot; =20 + might_sleep(); + key.objectid =3D 0; key.type =3D BTRFS_QGROUP_LIMIT_KEY; key.offset =3D qgroup->qgroupid; --=20 2.31.1 From nobody Mon Apr 13 17:20:05 2026 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 67CFBC433FE for ; Tue, 15 Nov 2022 16:12:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238256AbiKOQMm (ORCPT ); Tue, 15 Nov 2022 11:12:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232405AbiKOQMg (ORCPT ); Tue, 15 Nov 2022 11:12:36 -0500 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F31301D65A; Tue, 15 Nov 2022 08:12:34 -0800 (PST) Received: from dggemv704-chm.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4NBWM20HbjzqSMt; Wed, 16 Nov 2022 00:08:46 +0800 (CST) Received: from kwepemm600015.china.huawei.com (7.193.23.52) by dggemv704-chm.china.huawei.com (10.3.19.47) 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 00:12:33 +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 00:12:32 +0800 From: ChenXiaoSong To: , , CC: , , , , , , Subject: [PATCH v4 2/3] btrfs: qgroup: introduce btrfs_update_quoto_limit() helper Date: Wed, 16 Nov 2022 01:17:08 +0800 Message-ID: <20221115171709.3774614-3-chenxiaosong2@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221115171709.3774614-1-chenxiaosong2@huawei.com> References: <20221115171709.3774614-1-chenxiaosong2@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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 Content-Type: text/plain; charset="utf-8" No functional changed. Just simplify the code. Signed-off-by: ChenXiaoSong --- fs/btrfs/qgroup.c | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-) diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index d0480b9c6c86..ca609a70d067 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -1677,6 +1677,19 @@ int btrfs_remove_qgroup(struct btrfs_trans_handle *t= rans, u64 qgroupid) return ret; } =20 +static int btrfs_update_quoto_limit(struct btrfs_trans_handle *trans, + struct btrfs_qgroup *qgroup, + struct btrfs_fs_info *fs_info) +{ + int ret =3D update_qgroup_limit_item(trans, qgroup); + if (ret) { + qgroup_mark_inconsistent(fs_info); + btrfs_info(fs_info, "unable to update quota limit for %llu", + qgroup->qgroupid); + } + return ret; +} + int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid, struct btrfs_qgroup_limit *limit) { @@ -1742,13 +1755,7 @@ int btrfs_limit_qgroup(struct btrfs_trans_handle *tr= ans, u64 qgroupid, =20 spin_unlock(&fs_info->qgroup_lock); =20 - ret =3D update_qgroup_limit_item(trans, qgroup); - if (ret) { - qgroup_mark_inconsistent(fs_info); - btrfs_info(fs_info, "unable to update quota limit for %llu", - qgroupid); - } - + ret =3D btrfs_update_quoto_limit(trans, qgroup, fs_info); out: mutex_unlock(&fs_info->qgroup_ioctl_lock); return ret; @@ -2824,9 +2831,7 @@ int btrfs_run_qgroups(struct btrfs_trans_handle *tran= s) ret =3D update_qgroup_info_item(trans, qgroup); if (ret) qgroup_mark_inconsistent(fs_info); - ret =3D update_qgroup_limit_item(trans, qgroup); - if (ret) - qgroup_mark_inconsistent(fs_info); + ret =3D btrfs_update_quoto_limit(trans, qgroup, fs_info); spin_lock(&fs_info->qgroup_lock); } if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) @@ -2953,14 +2958,9 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *= trans, u64 srcid, dstgroup->rsv_rfer =3D inherit->lim.rsv_rfer; dstgroup->rsv_excl =3D inherit->lim.rsv_excl; =20 - ret =3D update_qgroup_limit_item(trans, dstgroup); - if (ret) { - qgroup_mark_inconsistent(fs_info); - btrfs_info(fs_info, - "unable to update quota limit for %llu", - dstgroup->qgroupid); + ret =3D btrfs_update_quoto_limit(trans, dstgroup, fs_info); + if (ret) goto unlock; - } } =20 if (srcid) { --=20 2.31.1 From nobody Mon Apr 13 17:20:05 2026 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 18D2AC433FE for ; Tue, 15 Nov 2022 16:12:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238382AbiKOQMo (ORCPT ); Tue, 15 Nov 2022 11:12:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33652 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238109AbiKOQMi (ORCPT ); Tue, 15 Nov 2022 11:12:38 -0500 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE0B2264AE; Tue, 15 Nov 2022 08:12:36 -0800 (PST) Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.57]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4NBWMp0BVszJnlH; Wed, 16 Nov 2022 00:09:26 +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 00:12:33 +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 00:12:32 +0800 From: ChenXiaoSong To: , , CC: , , , , , , Subject: [PATCH v4 3/3] btrfs: qgroup: fix sleep from invalid context bug in update_qgroup_limit_item() Date: Wed, 16 Nov 2022 01:17:09 +0800 Message-ID: <20221115171709.3774614-4-chenxiaosong2@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221115171709.3774614-1-chenxiaosong2@huawei.com> References: <20221115171709.3774614-1-chenxiaosong2@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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 Content-Type: text/plain; charset="utf-8" Syzkaller reported BUG as follows: BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274 Call Trace: dump_stack_lvl+0xcd/0x134 __might_resched.cold+0x222/0x26b kmem_cache_alloc+0x2e7/0x3c0 update_qgroup_limit_item+0xe1/0x390 btrfs_qgroup_inherit+0x147b/0x1ee0 create_subvol+0x4eb/0x1710 btrfs_mksubvol+0xfe5/0x13f0 __btrfs_ioctl_snap_create+0x2b0/0x430 btrfs_ioctl_snap_create_v2+0x25a/0x520 btrfs_ioctl+0x2a1c/0x5ce0 __x64_sys_ioctl+0x193/0x200 do_syscall_64+0x35/0x80 Fix this by delaying the limit item updates until unlock the spin lock. Signed-off-by: ChenXiaoSong --- fs/btrfs/qgroup.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index ca609a70d067..f84507ca3b99 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -2867,6 +2867,8 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *t= rans, u64 srcid, bool need_rescan =3D false; u32 level_size =3D 0; u64 nums; + bool update_limit =3D false; + int err; =20 /* * There are only two callers of this function. @@ -2957,10 +2959,7 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *= trans, u64 srcid, dstgroup->max_excl =3D inherit->lim.max_excl; dstgroup->rsv_rfer =3D inherit->lim.rsv_rfer; dstgroup->rsv_excl =3D inherit->lim.rsv_excl; - - ret =3D btrfs_update_quoto_limit(trans, dstgroup, fs_info); - if (ret) - goto unlock; + update_limit =3D true; } =20 if (srcid) { @@ -2987,6 +2986,7 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *t= rans, u64 srcid, dstgroup->max_excl =3D srcgroup->max_excl; dstgroup->rsv_rfer =3D srcgroup->rsv_rfer; dstgroup->rsv_excl =3D srcgroup->rsv_excl; + update_limit =3D false; =20 qgroup_dirty(fs_info, dstgroup); qgroup_dirty(fs_info, srcgroup); @@ -3055,6 +3055,11 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *= trans, u64 srcid, =20 unlock: spin_unlock(&fs_info->qgroup_lock); + if (update_limit) { + err =3D btrfs_update_quoto_limit(trans, dstgroup, fs_info); + if (err) + ret =3D err; + } if (!ret) ret =3D btrfs_sysfs_add_one_qgroup(fs_info, dstgroup); out: --=20 2.31.1