Re: Possible small bug in xfsprogs-dev/db/metadump.c

[Christoph Hellwig <hch@infradead.org>]

On Mon, Sep 28, 2009 at 10:36:13AM -0700, Richard Sharpe wrote:
> >
> > ? ? ? ?if (level == 0)
> > ? ? ? ? ? ? ? ?return 1;
> >
> > which should take care of the leaf nodes by exiting early.
> 
> Well, yes there is, but that is the problem I encountered. It is level
> as passed in when starting at the top of the tree, which is obtained
> from the levels value in the AGF, and is decremented by one on each
> recursion:
> 
>         if (!(*func)(iocur_top->data, agno, agbno, level - 1, btype, arg))
> 
> However, what should really be looked at is the value bb_level in the
> header in each free-space Btree node.

I think bother are equally valid.  The one passed in fro mthe top should
always be right while the ondisk one might be corrupted.

> After I made that change to my changes, I started being able to
> properly count all leaf nodes and free extents, and the numbers came
> out where I expected them to be (instead of not seeing many leaf nodes
> and vastly undercounting free extents).

Still not quite understanding your problem here.  Do you have a tool
of your own that doesn't start from the btree root but only walks
subtrees?  In that case you need to look at the on-disk level unless
you can find out easily what level you start at.  But I don't think we
need this for the existing tools that always walk from the root.

> 
> 
> 
> 
> 
> -- 
> Regards,
> Richard Sharpe
> 
> _______________________________________________
> xfs mailing list
> xfs@oss.sgi.com
> http://oss.sgi.com/mailman/listinfo/xfs
---end quoted text---

_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs