[PATCH, RFC] xfs: remove i_iolock and use i_rwsem in the VFS inode instead

[Peter Zijlstra]

On Thu, Aug 18, 2016 at 07:37:07PM +0200, Christoph Hellwig wrote:
> On Thu, Aug 11, 2016 at 11:54:44PM +0200, Peter Zijlstra wrote:
> > Sure, find below. Not been near a compiler.
> 
> It has now.  Below are the additions I need, and things seem to be
> passing fine with that.
> 
> Note that to fit the existing XFS lock asserts I'm using
> _lockdep_is_held directly instead of lockdep_assert_held_exclusive.
> All the exports are there, but I'm just trying to make sure you're
> not going to shout at me for that later :)

Hurm, if you're going to directly use that maybe we should pick a better
name ;-)

Also, be sure to check the debug_locks variable, if that's cleared the
result of _lockdep_is_held() isn't reliable -- we stop tracking lock
state when there's an error.

Thanks!