[PATCH 1/4] fs, afs: convert afs_cell.usage from atomic_t to refcount_t

[David Howells]

Reshetova, Elena <elena.reshetova at intel.com> wrote:

> Thank you very much David for testing the patches! 
> I guess for this one and other two patches it means that if we want to do the atomic_t --> refcount_t conversions, 
> we need to do +1 on the whole counting scheme to avoid issues around reaching zero.  
> Do you see this approach reasonable? I can give it a try, if it makes sense in your opinion. 

Or you could create a refcount_inc_may_resurrect() function that does allow
increment from 0.  Make it take a lock-check like the rcu functions do.

David