On Tue, Sep 18, 2012 at 01:52:38PM +0800, Miao Xie wrote:

The macro btrfs_abort_transaction() can get the line number of the code
where the problem happens, so we should invoke it in the place that the
error occurs, or we will lose the line number.

Thanks, that's it! AFAICS it's based on

  [PATCH V4 01/12] Btrfs: fix error path in create_pending_snapshot()

so I'll base my patch on top of these two.

david