[PATCH 2/2] xfs: ensure we copy buffer type in da btree root splits

[Christoph Hellwig]

On Mon, Sep 02, 2013 at 10:32:01AM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner at redhat.com>
> 
> When splitting the root of the da btree, we shuffled data between
> buffers and the structures that track them. At one point, we copy
> data and state from one buffer to another, including the ops
> aasociated with the buffer. When we do this, we also need to copy
> the buffer type associated with the buf log item so that the buffer
> is logged correctly. If we don't do that, log recovery won't
> recognise it and hence it won't recalculate the CRC on the buffer
> after recovery. This leads to a directory block that can't be read
> after recovery has run.
> 
> Found by inspection after finding the same problem with remote
> symlink buffers.

It would be great to find a way to trigger this in QA as this shows
another area lacking coverage.