Re: [2.6.27-rc4] XFS i_lock vs i_iolock...

[Christoph Hellwig]

On Mon, Aug 25, 2008 at 08:59:33AM +0200, Peter Zijlstra wrote:
> How can you take two locks in one go? It seems to me you always need to
> take them one after another, and as soon as you do that, you have
> ordering constraints.

Yes, you would.  Except that in all other places we only have a single
iolock involved, so the ordering of the second iolock and second ilock
don't matter.

Because of that I think declaring that xfs_lock_two_inodes can just
lock on lock type at a time might be the better solution.
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