nfsd: deal with DELEGRETURN racing with CB_RECALL

We have observed the server sending recalls for delegation stateids
that have already been successfully returned. Change
nfsd4_cb_recall_done() to return success if the client has returned
the delegation. While this does not completely eliminate the sending
of recalls for delegations that have already been returned, this
does prevent unnecessarily declaring the callback path to be down.

Reported-by: Eric Meddaugh <etmsys@rit.edu>
Signed-off-by: Andrew Elble <aweits@rit.edu>
Acked-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 08746ec1d44a58e43b25eebec73293aa7799d06a..0f1d5691b795751553d02003c32c4ceb90a1ee5c 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3510,6 +3510,9 @@ static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
 {
        struct nfs4_delegation *dp = cb_to_delegation(cb);
 
+       if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
+               return 1;
+
        switch (task->tk_status) {
        case 0:
                return 1;