new function nfs41_delegation_return() for synchronous delegation return. uses a condition variable to wait if another thread is already returning the delegation
if nfs41_delegate_open() would conflict with a delegation, return it before sending the OPEN
return the delegation before sending LINK, RENAME, REMOVE, and SETATTR
all of this functionality is dependent on the preprocessor define DELEGATION_RETURN_ON_CONFLICT (on by default). if not defined, nfs41_delegation_return() is a noop
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
moved thread creation from callback_server.c to nfs41_delegation_recall() in delegation.c
nfs41_delegation_recall() first searches for the delegation, and returns NFS4ERR_BADHANDLE if not found. otherwise, it spawns a thread to handle the recall and returns NFS4_OK
delegation_return() calls nfs41_delegation_to_open() for each nfs41_open_state associated with the delegation
nfs41_delegation_to_open() sends OPEN with CLAIM_DELEGATE_CUR to reclaim an open stateid, and uses a condition variable in nfs41_open_state to prevent multiple threads from attempting reclaim
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
added delegation.c and .h
nfs41_client stores a list of nfs41_delegation_state
new function nfs41_delegate_open() to look for a compatible delegation before calling nfs41_open()
if nfs41_open() is granted a delegation, call nfs41_delegation_granted() to register it with the client
client calls nfs41_client_delegation_free() on unmount to free list of delegations
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
