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Thu, 03 Sep 2020 11:41:18 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 083Bf9fM175236; Thu, 3 Sep 2020 11:41:18 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 3380sw03sk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 03 Sep 2020 11:41:18 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 083BfGgX006234; Thu, 3 Sep 2020 11:41:16 GMT Received: from [192.168.1.102] (/39.109.231.106) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 03 Sep 2020 04:41:16 -0700 Subject: Re: [PATCH 2/4] btrfs: init sysfs for devices outside of the chunk_mutex To: dsterba@suse.cz, Josef Bacik , linux-btrfs@vger.kernel.org, kernel-team@fb.com References: <5dccee8f9d7fe7b5072090327854fcbfdbd45b28.1598996236.git.josef@toxicpanda.com> <79ace2bf-6f01-39ee-0566-727182c5ff85@oracle.com> <20200902174549.GL28318@twin.jikos.cz> From: Anand Jain Message-ID: Date: Thu, 3 Sep 2020 19:41:12 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.2.1 MIME-Version: 1.0 In-Reply-To: <20200902174549.GL28318@twin.jikos.cz> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9732 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 adultscore=0 phishscore=0 malwarescore=0 mlxscore=0 spamscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009030109 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9732 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 mlxlogscore=999 adultscore=0 impostorscore=0 mlxscore=0 suspectscore=0 spamscore=0 clxscore=1011 malwarescore=0 lowpriorityscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009030109 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 3/9/20 1:45 am, David Sterba wrote: > On Wed, Sep 02, 2020 at 02:21:31PM +0800, Anand Jain wrote: >>> @@ -2609,6 +2606,10 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path >>> btrfs_clear_space_info_full(fs_info); >>> >>> mutex_unlock(&fs_info->chunk_mutex); >>> + >>> + /* add sysfs device entry */ >>> + btrfs_sysfs_add_devices_dir(fs_devices, device); >>> + >>> mutex_unlock(&fs_devices->device_list_mutex); >>> >>> if (seeding_dev) { >>> >> >> Strange we should get this splat when btrfs_sysfs_add_devices_dir() >> already has implicit GFP_NOFS allocation scope right? What did I >> miss? > > The problem is the sysfs' kernfs_mutex, all sysfs allocations are > GFP_KERNEL thus it can grab fs_reclaim at some point. > Oh. Thanks. Anand