[Cluster-devel] RFC: iomap write invalidation

[Christoph Hellwig]

Hi all,

this series has two parts:  the first one picks up Dave's patch to avoid
invalidation entierly for reads, picked up deep down from the btrfs iomap
thread.  The second one falls back to buffered writes if invalidation fails
instead of leaving a stale cache around.  Let me know what you think about
this approch.