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Date: Mon, 18 Sep 2017 14:53:49 -0400 From: Waiman Long <longman@...hat.com> To: Jens Axboe <axboe@...nel.dk>, Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...nel.org> Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org, linux-nilfs@...r.kernel.org, cluster-devel@...hat.com, Bart Van Assche <Bart.VanAssche@....com>, Waiman Long <longman@...hat.com> Subject: [PATCH v6 0/2] blktrace: Fix deadlock problem 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
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