Re: [PATCH] another reader/writer lock for btrfs metadata

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Excerpts from Chris Mason's message of 2011-07-25 14:34:49 -0400:
> Hi everyone,
> 
> I've updated the integration-test branch to use this code instead.  It
> is a shiny new reader/writer lock built around rw spinlocks.  I've
> removed all the adaptive spinning and started trusting the hints btrfs
> already has about when blocks should block or spin.

I tested with lockdep and looks like I've got a bug in btrfs_next_leaf's
lockdep handling.  So, please don't run this code with
CONFIG_DEBUG_LOCK_ALLOC turned on.  The bug is only in lockdep mode, so
we're fine with it off.

I'll fix it up in the morning.

-chris
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