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Re: [PATCH] dax: fix deadlock in __dax_fault

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On Fri, Sep 25, 2015 at 12:53:57PM +1000, Dave Chinner wrote:
<>
> We've already got block allocation serialisation at the filesystem
> level, and the issue is the unserialised block zeroing being done by
> the dax code. That can be fixed by moving the zeroing into the
> filesystem code when it runs "complete_unwritten" and checks whether
> the mapping has already been marked as written or not...
> 
> I've recently pointed out in a different thread that this is the
> solution to whatever that problem was (can't recall which
> thread/problem is was now :/ ) and it the same solution here. We
> already have the serialisation we need, we just need to move the
> block zeroing operation into the appropriate places to make it work
> correctly.

I think perhaps this is the thread that you're remembering:
https://lkml.org/lkml/2015/8/11/731
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Thread

[PATCH] dax: fix deadlock in __dax_fault Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-09-23 22:50 +0200
  Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-24 05:00 +0200
    Re: [PATCH] dax: fix deadlock in __dax_fault Boaz Harrosh <boaz@plexistor.com> - 2015-09-24 11:10 +0200
    Re: [PATCH] dax: fix deadlock in __dax_fault Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-09-24 18:00 +0200
      Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-25 05:00 +0200
        Re: [PATCH] dax: fix deadlock in __dax_fault Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-09-25 20:30 +0200
          Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-26 01:40 +0200
        Re: [PATCH] dax: fix deadlock in __dax_fault Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-09-26 05:20 +0200
          Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-28 03:00 +0200
            Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-28 12:20 +0200
            Re: [PATCH] dax: fix deadlock in __dax_fault Dan Williams <dan.j.williams@intel.com> - 2015-09-28 14:20 +0200
              Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-28 23:40 +0200
                Re: [PATCH] dax: fix deadlock in __dax_fault Dan Williams <dan.j.williams@intel.com> - 2015-09-29 01:00 +0200
                Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-29 04:20 +0200
                Re: [PATCH] dax: fix deadlock in __dax_fault Dan Williams <dan.j.williams@intel.com> - 2015-09-29 05:10 +0200
                Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-29 06:20 +0200
            Re: [PATCH] dax: fix deadlock in __dax_fault Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-09-29 00:50 +0200
              Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-29 04:50 +0200
                Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-30 04:00 +0200
                Re: [PATCH] dax: fix deadlock in __dax_fault Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-09-30 04:10 +0200
                Re: [PATCH] dax: fix deadlock in __dax_fault Dave Chinner <david@fromorbit.com> - 2015-09-30 05:30 +0200
                Re: [PATCH] dax: fix deadlock in __dax_fault Jan Kara <jack@suse.cz> - 2015-10-02 15:00 +0200

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