Re: tstile syndrome

[christos%astron.com@localhost (Christos Zoulas)]

In article <88C7FAE9-9F40-488D-A35E-80E9D2749300%shagadelic.org@localhost>,
Jason Thorpe  <thorpej%shagadelic.org@localhost> wrote:
>
>On Sep 1, 2009, at 9:32 AM, David Holland wrote:
>
>> Such as? Please give clear examples. Moving the locks to below the VFS
>> layer does not change any of the ordering constraints or any of the
>> hard problems (vnode recycle, rename, etc.) but only forces cutting
>> and pasting 30 copies of what was previously FS-independent code into
>> every FS.
>
>Not true at all.  In Mac OS X, there is no exposed vnode-level locking  
>at the VFS layer or in the VFS<->file system interface.  Everything is  
>handled at the lower layers.  The reason that you don't end up copy- 
>pasting 30 copies, etc. is because it gives you a chance to dump the  
>completely irrational locking protocol that currently exists.

How do you handle fs layering then? Which layer handles the locking?

christos