tree 8fb586be995259ff4c98a01ee9ed183b107195b5
parent 50f2112cf7a3e62a8d33838eb205d5fef306457a
author Benjamin Coddington <bcodding@redhat.com> 1491929410 -0400
committer Trond Myklebust <trond.myklebust@primarydata.com> 1492785901 -0400

NFS: Add an iocounter wait function for async RPC tasks

By sleeping on a new NFS Unlock-On-Close waitqueue, rpc tasks may wait for
a lock context's iocounter to reach zero.  The rpc waitqueue is only woken
when the open_context has the NFS_CONTEXT_UNLOCK flag set in order to
mitigate spurious wake-ups for any iocounter reaching zero.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>