From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:36924 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752595AbdIRSy0 (ORCPT ); Mon, 18 Sep 2017 14:54:26 -0400 From: Waiman Long To: Jens Axboe , Steven Rostedt , Ingo Molnar Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-nilfs@vger.kernel.org, cluster-devel@redhat.com, Bart Van Assche , Waiman Long Subject: [PATCH v6 0/2] blktrace: Fix deadlock problem Date: Mon, 18 Sep 2017 14:53:49 -0400 Message-Id: <1505760831-7747-1-git-send-email-longman@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: v6: - Add a second patch to rename the bd_fsfreeze_mutex to bd_fsfreeze_blktrace_mutex. v5: - Overload the bd_fsfreeze_mutex in block_device structure for blktrace protection. v4: - Use blktrace_mutex in blk_trace_ioctl() as well. v3: - Use a global blktrace_mutex to serialize sysfs attribute accesses instead of the bd_mutex. v2: - Use READ_ONCE() and smp_store_mb() to read and write bd_deleting. - Check for signal in the mutex_trylock loops. - Use usleep() instead of schedule() for RT tasks. This patchset fixes a potential blktrace deadlock problem between block device deletion and sysfs operations. Waiman Long (2): blktrace: Fix potentail deadlock between delete & sysfs ops block_dev: Rename bd_fsfreeze_mutex fs/block_dev.c | 14 +++++++------- fs/gfs2/ops_fstype.c | 6 +++--- fs/nilfs2/super.c | 6 +++--- fs/super.c | 6 +++--- include/linux/fs.h | 5 +++-- kernel/trace/blktrace.c | 26 ++++++++++++++++++++------ 6 files changed, 39 insertions(+), 24 deletions(-) -- 1.8.3.1