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SubjectRe: [PATCH v6 0/2] blktrace: Fix deadlock problem

Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

for the series.

Jens, feel free to take this in your tree.

-- Steve


On Mon, 18 Sep 2017 14:53:49 -0400
Waiman Long <longman@redhat.com> wrote:

> 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(-)
>

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